Merge branch 'master' into docking + amends change to nullptr (#5760)

# Conflicts:
#	backends/imgui_impl_dx10.cpp
#	backends/imgui_impl_dx11.cpp
#	backends/imgui_impl_dx12.cpp
#	backends/imgui_impl_dx9.cpp
#	backends/imgui_impl_glfw.cpp
#	backends/imgui_impl_opengl2.cpp
#	backends/imgui_impl_opengl3.cpp
#	backends/imgui_impl_osx.mm
#	backends/imgui_impl_sdl.cpp
#	backends/imgui_impl_vulkan.cpp
#	backends/imgui_impl_win32.cpp
#	imgui_internal.h

backends/imgui_impl_allegro5.cpp

@@ -17,6 +17,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2022-10-11: Using 'nullptr' instead of 'NULL' as per our switch to C++11.
 //  2022-09-26: Inputs: Renamed ImGuiKey_ModXXX introduced in 1.87 to ImGuiMod_XXX (old names still supported).
 //  2022-01-26: Inputs: replaced short-lived io.AddKeyModsEvent() (added two weeks ago) with io.AddKeyEvent() using ImGuiKey_ModXXX flags. Sorry for the confusion.
 //  2022-01-17: Inputs: calling new io.AddMousePosEvent(), io.AddMouseButtonEvent(), io.AddMouseWheelEvent() API (1.87+).
@@ -78,7 +79,7 @@ struct ImGui_ImplAllegro5_Data
 // Backend data stored in io.BackendPlatformUserData to allow support for multiple Dear ImGui contexts
 // It is STRONGLY preferred that you use docking branch with multi-viewports (== single Dear ImGui context + multiple windows) instead of multiple Dear ImGui contexts.
 // FIXME: multi-context support is not well tested and probably dysfunctional in this backend.
-static ImGui_ImplAllegro5_Data* ImGui_ImplAllegro5_GetBackendData()     { return ImGui::GetCurrentContext() ? (ImGui_ImplAllegro5_Data*)ImGui::GetIO().BackendPlatformUserData : NULL; }
+static ImGui_ImplAllegro5_Data* ImGui_ImplAllegro5_GetBackendData()     { return ImGui::GetCurrentContext() ? (ImGui_ImplAllegro5_Data*)ImGui::GetIO().BackendPlatformUserData : nullptr; }
 
 struct ImDrawVertAllegro
 {
@@ -145,7 +146,7 @@ void ImGui_ImplAllegro5_RenderDrawData(ImDrawData* draw_data)
             dst_v->col = al_map_rgba(c[0], c[1], c[2], c[3]);
         }
 
-        const int* indices = NULL;
+        const int* indices = nullptr;
         if (sizeof(ImDrawIdx) == 2)
         {
             // FIXME-OPT: Unfortunately Allegro doesn't support 16-bit indices.. You can '#define ImDrawIdx int' in imconfig.h to request Dear ImGui to output 32-bit indices.
@@ -253,14 +254,14 @@ void ImGui_ImplAllegro5_InvalidateDeviceObjects()
     ImGui_ImplAllegro5_Data* bd = ImGui_ImplAllegro5_GetBackendData();
     if (bd->Texture)
     {
-        io.Fonts->SetTexID(NULL);
+        io.Fonts->SetTexID(0);
         al_destroy_bitmap(bd->Texture);
-        bd->Texture = NULL;
+        bd->Texture = nullptr;
     }
     if (bd->MouseCursorInvisible)
     {
         al_destroy_mouse_cursor(bd->MouseCursorInvisible);
-        bd->MouseCursorInvisible = NULL;
+        bd->MouseCursorInvisible = nullptr;
     }
 }
 
@@ -397,7 +398,7 @@ static ImGuiKey ImGui_ImplAllegro5_KeyCodeToImGuiKey(int key_code)
 bool ImGui_ImplAllegro5_Init(ALLEGRO_DISPLAY* display)
 {
     ImGuiIO& io = ImGui::GetIO();
-    IM_ASSERT(io.BackendPlatformUserData == NULL && "Already initialized a platform backend!");
+    IM_ASSERT(io.BackendPlatformUserData == nullptr && "Already initialized a platform backend!");
 
     // Setup backend capabilities flags
     ImGui_ImplAllegro5_Data* bd = IM_NEW(ImGui_ImplAllegro5_Data)();
@@ -422,7 +423,7 @@ bool ImGui_ImplAllegro5_Init(ALLEGRO_DISPLAY* display)
 #if ALLEGRO_HAS_CLIPBOARD
     io.SetClipboardTextFn = ImGui_ImplAllegro5_SetClipboardText;
     io.GetClipboardTextFn = ImGui_ImplAllegro5_GetClipboardText;
-    io.ClipboardUserData = NULL;
+    io.ClipboardUserData = nullptr;
 #endif
 
     return true;
@@ -431,7 +432,7 @@ bool ImGui_ImplAllegro5_Init(ALLEGRO_DISPLAY* display)
 void ImGui_ImplAllegro5_Shutdown()
 {
     ImGui_ImplAllegro5_Data* bd = ImGui_ImplAllegro5_GetBackendData();
-    IM_ASSERT(bd != NULL && "No platform backend to shutdown, or already shutdown?");
+    IM_ASSERT(bd != nullptr && "No platform backend to shutdown, or already shutdown?");
     ImGuiIO& io = ImGui::GetIO();
 
     ImGui_ImplAllegro5_InvalidateDeviceObjects();
@@ -440,8 +441,8 @@ void ImGui_ImplAllegro5_Shutdown()
     if (bd->ClipboardTextData)
         al_free(bd->ClipboardTextData);
 
-    io.BackendPlatformUserData = NULL;
-    io.BackendPlatformName = io.BackendRendererName = NULL;
+    io.BackendPlatformUserData = nullptr;
+    io.BackendPlatformName = io.BackendRendererName = nullptr;
     IM_DELETE(bd);
 }
 
@@ -559,7 +560,7 @@ static void ImGui_ImplAllegro5_UpdateMouseCursor()
 void ImGui_ImplAllegro5_NewFrame()
 {
     ImGui_ImplAllegro5_Data* bd = ImGui_ImplAllegro5_GetBackendData();
-    IM_ASSERT(bd != NULL && "Did you call ImGui_ImplAllegro5_Init()?");
+    IM_ASSERT(bd != nullptr && "Did you call ImGui_ImplAllegro5_Init()?");
 
     if (!bd->Texture)
         ImGui_ImplAllegro5_CreateDeviceObjects();

backends/imgui_impl_dx10.cpp

@@ -14,6 +14,7 @@
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
 //  2022-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2022-10-11: Using 'nullptr' instead of 'NULL' as per our switch to C++11.
 //  2021-06-29: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX).
 //  2021-05-19: DirectX10: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement)
 //  2021-02-18: DirectX10: Change blending equation to preserve alpha in output buffer.
@@ -73,7 +74,7 @@ struct VERTEX_CONSTANT_BUFFER_DX10
 // It is STRONGLY preferred that you use docking branch with multi-viewports (== single Dear ImGui context + multiple windows) instead of multiple Dear ImGui contexts.
 static ImGui_ImplDX10_Data* ImGui_ImplDX10_GetBackendData()
 {
-    return ImGui::GetCurrentContext() ? (ImGui_ImplDX10_Data*)ImGui::GetIO().BackendRendererUserData : NULL;
+    return ImGui::GetCurrentContext() ? (ImGui_ImplDX10_Data*)ImGui::GetIO().BackendRendererUserData : nullptr;
 }
 
 // Forward Declarations
@@ -106,7 +107,7 @@ static void ImGui_ImplDX10_SetupRenderState(ImDrawData* draw_data, ID3D10Device*
     ctx->VSSetConstantBuffers(0, 1, &bd->pVertexConstantBuffer);
     ctx->PSSetShader(bd->pPixelShader);
     ctx->PSSetSamplers(0, 1, &bd->pFontSampler);
-    ctx->GSSetShader(NULL);
+    ctx->GSSetShader(nullptr);
 
     // Setup render state
     const float blend_factor[4] = { 0.f, 0.f, 0.f, 0.f };
@@ -128,7 +129,7 @@ void ImGui_ImplDX10_RenderDrawData(ImDrawData* draw_data)
     // Create and grow vertex/index buffers if needed
     if (!bd->pVB || bd->VertexBufferSize < draw_data->TotalVtxCount)
     {
-        if (bd->pVB) { bd->pVB->Release(); bd->pVB = NULL; }
+        if (bd->pVB) { bd->pVB->Release(); bd->pVB = nullptr; }
         bd->VertexBufferSize = draw_data->TotalVtxCount + 5000;
         D3D10_BUFFER_DESC desc;
         memset(&desc, 0, sizeof(D3D10_BUFFER_DESC));
@@ -137,13 +138,13 @@ void ImGui_ImplDX10_RenderDrawData(ImDrawData* draw_data)
         desc.BindFlags = D3D10_BIND_VERTEX_BUFFER;
         desc.CPUAccessFlags = D3D10_CPU_ACCESS_WRITE;
         desc.MiscFlags = 0;
-        if (ctx->CreateBuffer(&desc, NULL, &bd->pVB) < 0)
+        if (ctx->CreateBuffer(&desc, nullptr, &bd->pVB) < 0)
             return;
     }
 
     if (!bd->pIB || bd->IndexBufferSize < draw_data->TotalIdxCount)
     {
-        if (bd->pIB) { bd->pIB->Release(); bd->pIB = NULL; }
+        if (bd->pIB) { bd->pIB->Release(); bd->pIB = nullptr; }
         bd->IndexBufferSize = draw_data->TotalIdxCount + 10000;
         D3D10_BUFFER_DESC desc;
         memset(&desc, 0, sizeof(D3D10_BUFFER_DESC));
@@ -151,13 +152,13 @@ void ImGui_ImplDX10_RenderDrawData(ImDrawData* draw_data)
         desc.ByteWidth = bd->IndexBufferSize * sizeof(ImDrawIdx);
         desc.BindFlags = D3D10_BIND_INDEX_BUFFER;
         desc.CPUAccessFlags = D3D10_CPU_ACCESS_WRITE;
-        if (ctx->CreateBuffer(&desc, NULL, &bd->pIB) < 0)
+        if (ctx->CreateBuffer(&desc, nullptr, &bd->pIB) < 0)
             return;
     }
 
     // Copy and convert all vertices into a single contiguous buffer
-    ImDrawVert* vtx_dst = NULL;
-    ImDrawIdx* idx_dst = NULL;
+    ImDrawVert* vtx_dst = nullptr;
+    ImDrawIdx* idx_dst = nullptr;
     bd->pVB->Map(D3D10_MAP_WRITE_DISCARD, 0, (void**)&vtx_dst);
     bd->pIB->Map(D3D10_MAP_WRITE_DISCARD, 0, (void**)&idx_dst);
     for (int n = 0; n < draw_data->CmdListsCount; n++)
@@ -320,13 +321,13 @@ static void ImGui_ImplDX10_CreateFontsTexture()
         desc.BindFlags = D3D10_BIND_SHADER_RESOURCE;
         desc.CPUAccessFlags = 0;
 
-        ID3D10Texture2D* pTexture = NULL;
+        ID3D10Texture2D* pTexture = nullptr;
         D3D10_SUBRESOURCE_DATA subResource;
         subResource.pSysMem = pixels;
         subResource.SysMemPitch = desc.Width * 4;
         subResource.SysMemSlicePitch = 0;
         bd->pd3dDevice->CreateTexture2D(&desc, &subResource, &pTexture);
-        IM_ASSERT(pTexture != NULL);
+        IM_ASSERT(pTexture != nullptr);
 
         // Create texture view
         D3D10_SHADER_RESOURCE_VIEW_DESC srv_desc;
@@ -404,7 +405,7 @@ bool    ImGui_ImplDX10_CreateDeviceObjects()
             }";
 
         ID3DBlob* vertexShaderBlob;
-        if (FAILED(D3DCompile(vertexShader, strlen(vertexShader), NULL, NULL, NULL, "main", "vs_4_0", 0, 0, &vertexShaderBlob, NULL)))
+        if (FAILED(D3DCompile(vertexShader, strlen(vertexShader), nullptr, nullptr, nullptr, "main", "vs_4_0", 0, 0, &vertexShaderBlob, nullptr)))
             return false; // NB: Pass ID3DBlob* pErrorBlob to D3DCompile() to get error showing in (const char*)pErrorBlob->GetBufferPointer(). Make sure to Release() the blob!
         if (bd->pd3dDevice->CreateVertexShader(vertexShaderBlob->GetBufferPointer(), vertexShaderBlob->GetBufferSize(), &bd->pVertexShader) != S_OK)
         {
@@ -434,7 +435,7 @@ bool    ImGui_ImplDX10_CreateDeviceObjects()
             desc.BindFlags = D3D10_BIND_CONSTANT_BUFFER;
             desc.CPUAccessFlags = D3D10_CPU_ACCESS_WRITE;
             desc.MiscFlags = 0;
-            bd->pd3dDevice->CreateBuffer(&desc, NULL, &bd->pVertexConstantBuffer);
+            bd->pd3dDevice->CreateBuffer(&desc, nullptr, &bd->pVertexConstantBuffer);
         }
     }
 
@@ -457,7 +458,7 @@ bool    ImGui_ImplDX10_CreateDeviceObjects()
             }";
 
         ID3DBlob* pixelShaderBlob;
-        if (FAILED(D3DCompile(pixelShader, strlen(pixelShader), NULL, NULL, NULL, "main", "ps_4_0", 0, 0, &pixelShaderBlob, NULL)))
+        if (FAILED(D3DCompile(pixelShader, strlen(pixelShader), nullptr, nullptr, nullptr, "main", "ps_4_0", 0, 0, &pixelShaderBlob, nullptr)))
             return false; // NB: Pass ID3DBlob* pErrorBlob to D3DCompile() to get error showing in (const char*)pErrorBlob->GetBufferPointer(). Make sure to Release() the blob!
         if (bd->pd3dDevice->CreatePixelShader(pixelShaderBlob->GetBufferPointer(), pixelShaderBlob->GetBufferSize(), &bd->pPixelShader) != S_OK)
         {
@@ -519,23 +520,23 @@ void    ImGui_ImplDX10_InvalidateDeviceObjects()
     if (!bd->pd3dDevice)
         return;
 
-    if (bd->pFontSampler)           { bd->pFontSampler->Release(); bd->pFontSampler = NULL; }
-    if (bd->pFontTextureView)       { bd->pFontTextureView->Release(); bd->pFontTextureView = NULL; ImGui::GetIO().Fonts->SetTexID(NULL); } // We copied bd->pFontTextureView to io.Fonts->TexID so let's clear that as well.
-    if (bd->pIB)                    { bd->pIB->Release(); bd->pIB = NULL; }
-    if (bd->pVB)                    { bd->pVB->Release(); bd->pVB = NULL; }
-    if (bd->pBlendState)            { bd->pBlendState->Release(); bd->pBlendState = NULL; }
-    if (bd->pDepthStencilState)     { bd->pDepthStencilState->Release(); bd->pDepthStencilState = NULL; }
-    if (bd->pRasterizerState)       { bd->pRasterizerState->Release(); bd->pRasterizerState = NULL; }
-    if (bd->pPixelShader)           { bd->pPixelShader->Release(); bd->pPixelShader = NULL; }
-    if (bd->pVertexConstantBuffer)  { bd->pVertexConstantBuffer->Release(); bd->pVertexConstantBuffer = NULL; }
-    if (bd->pInputLayout)           { bd->pInputLayout->Release(); bd->pInputLayout = NULL; }
-    if (bd->pVertexShader)          { bd->pVertexShader->Release(); bd->pVertexShader = NULL; }
+    if (bd->pFontSampler)           { bd->pFontSampler->Release(); bd->pFontSampler = nullptr; }
+    if (bd->pFontTextureView)       { bd->pFontTextureView->Release(); bd->pFontTextureView = nullptr; ImGui::GetIO().Fonts->SetTexID(0); } // We copied bd->pFontTextureView to io.Fonts->TexID so let's clear that as well.
+    if (bd->pIB)                    { bd->pIB->Release(); bd->pIB = nullptr; }
+    if (bd->pVB)                    { bd->pVB->Release(); bd->pVB = nullptr; }
+    if (bd->pBlendState)            { bd->pBlendState->Release(); bd->pBlendState = nullptr; }
+    if (bd->pDepthStencilState)     { bd->pDepthStencilState->Release(); bd->pDepthStencilState = nullptr; }
+    if (bd->pRasterizerState)       { bd->pRasterizerState->Release(); bd->pRasterizerState = nullptr; }
+    if (bd->pPixelShader)           { bd->pPixelShader->Release(); bd->pPixelShader = nullptr; }
+    if (bd->pVertexConstantBuffer)  { bd->pVertexConstantBuffer->Release(); bd->pVertexConstantBuffer = nullptr; }
+    if (bd->pInputLayout)           { bd->pInputLayout->Release(); bd->pInputLayout = nullptr; }
+    if (bd->pVertexShader)          { bd->pVertexShader->Release(); bd->pVertexShader = nullptr; }
 }
 
 bool    ImGui_ImplDX10_Init(ID3D10Device* device)
 {
     ImGuiIO& io = ImGui::GetIO();
-    IM_ASSERT(io.BackendRendererUserData == NULL && "Already initialized a renderer backend!");
+    IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
 
     // Setup backend capabilities flags
     ImGui_ImplDX10_Data* bd = IM_NEW(ImGui_ImplDX10_Data)();
@@ -545,9 +546,9 @@ bool    ImGui_ImplDX10_Init(ID3D10Device* device)
     io.BackendFlags |= ImGuiBackendFlags_RendererHasViewports;  // We can create multi-viewports on the Renderer side (optional)
 
     // Get factory from device
-    IDXGIDevice* pDXGIDevice = NULL;
-    IDXGIAdapter* pDXGIAdapter = NULL;
-    IDXGIFactory* pFactory = NULL;
+    IDXGIDevice* pDXGIDevice = nullptr;
+    IDXGIAdapter* pDXGIAdapter = nullptr;
+    IDXGIFactory* pFactory = nullptr;
     if (device->QueryInterface(IID_PPV_ARGS(&pDXGIDevice)) == S_OK)
         if (pDXGIDevice->GetParent(IID_PPV_ARGS(&pDXGIAdapter)) == S_OK)
             if (pDXGIAdapter->GetParent(IID_PPV_ARGS(&pFactory)) == S_OK)
@@ -567,22 +568,22 @@ bool    ImGui_ImplDX10_Init(ID3D10Device* device)
 void ImGui_ImplDX10_Shutdown()
 {
     ImGui_ImplDX10_Data* bd = ImGui_ImplDX10_GetBackendData();
-    IM_ASSERT(bd != NULL && "No renderer backend to shutdown, or already shutdown?");
+    IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?");
     ImGuiIO& io = ImGui::GetIO();
 
     ImGui_ImplDX10_ShutdownPlatformInterface();
     ImGui_ImplDX10_InvalidateDeviceObjects();
     if (bd->pFactory) { bd->pFactory->Release(); }
     if (bd->pd3dDevice) { bd->pd3dDevice->Release(); }
-    io.BackendRendererName = NULL;
-    io.BackendRendererUserData = NULL;
+    io.BackendRendererName = nullptr;
+    io.BackendRendererUserData = nullptr;
     IM_DELETE(bd);
 }
 
 void ImGui_ImplDX10_NewFrame()
 {
     ImGui_ImplDX10_Data* bd = ImGui_ImplDX10_GetBackendData();
-    IM_ASSERT(bd != NULL && "Did you call ImGui_ImplDX10_Init()?");
+    IM_ASSERT(bd != nullptr && "Did you call ImGui_ImplDX10_Init()?");
 
     if (!bd->pFontSampler)
         ImGui_ImplDX10_CreateDeviceObjects();
@@ -600,8 +601,8 @@ struct ImGui_ImplDX10_ViewportData
     IDXGISwapChain*         SwapChain;
     ID3D10RenderTargetView* RTView;
 
-    ImGui_ImplDX10_ViewportData()   { SwapChain = NULL; RTView = NULL; }
-    ~ImGui_ImplDX10_ViewportData()  { IM_ASSERT(SwapChain == NULL && RTView == NULL); }
+    ImGui_ImplDX10_ViewportData()   { SwapChain = nullptr; RTView = nullptr; }
+    ~ImGui_ImplDX10_ViewportData()  { IM_ASSERT(SwapChain == nullptr && RTView == nullptr); }
 };
 
 static void ImGui_ImplDX10_CreateWindow(ImGuiViewport* viewport)
@@ -630,7 +631,7 @@ static void ImGui_ImplDX10_CreateWindow(ImGuiViewport* viewport)
     sd.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;
     sd.Flags = 0;
 
-    IM_ASSERT(vd->SwapChain == NULL && vd->RTView == NULL);
+    IM_ASSERT(vd->SwapChain == nullptr && vd->RTView == nullptr);
     bd->pFactory->CreateSwapChain(bd->pd3dDevice, &sd, &vd->SwapChain);
 
     // Create the render target
@@ -638,7 +639,7 @@ static void ImGui_ImplDX10_CreateWindow(ImGuiViewport* viewport)
     {
         ID3D10Texture2D* pBackBuffer;
         vd->SwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
-        bd->pd3dDevice->CreateRenderTargetView(pBackBuffer, NULL, &vd->RTView);
+        bd->pd3dDevice->CreateRenderTargetView(pBackBuffer, nullptr, &vd->RTView);
         pBackBuffer->Release();
     }
 }
@@ -650,13 +651,13 @@ static void ImGui_ImplDX10_DestroyWindow(ImGuiViewport* viewport)
     {
         if (vd->SwapChain)
             vd->SwapChain->Release();
-        vd->SwapChain = NULL;
+        vd->SwapChain = nullptr;
         if (vd->RTView)
             vd->RTView->Release();
-        vd->RTView = NULL;
+        vd->RTView = nullptr;
         IM_DELETE(vd);
     }
-    viewport->RendererUserData = NULL;
+    viewport->RendererUserData = nullptr;
 }
 
 static void ImGui_ImplDX10_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
@@ -666,15 +667,15 @@ static void ImGui_ImplDX10_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
     if (vd->RTView)
     {
         vd->RTView->Release();
-        vd->RTView = NULL;
+        vd->RTView = nullptr;
     }
     if (vd->SwapChain)
     {
-        ID3D10Texture2D* pBackBuffer = NULL;
+        ID3D10Texture2D* pBackBuffer = nullptr;
         vd->SwapChain->ResizeBuffers(0, (UINT)size.x, (UINT)size.y, DXGI_FORMAT_UNKNOWN, 0);
         vd->SwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
-        if (pBackBuffer == NULL) { fprintf(stderr, "ImGui_ImplDX10_SetWindowSize() failed creating buffers.\n"); return; }
-        bd->pd3dDevice->CreateRenderTargetView(pBackBuffer, NULL, &vd->RTView);
+        if (pBackBuffer == nullptr) { fprintf(stderr, "ImGui_ImplDX10_SetWindowSize() failed creating buffers.\n"); return; }
+        bd->pd3dDevice->CreateRenderTargetView(pBackBuffer, nullptr, &vd->RTView);
         pBackBuffer->Release();
     }
 }
@@ -684,7 +685,7 @@ static void ImGui_ImplDX10_RenderViewport(ImGuiViewport* viewport, void*)
     ImGui_ImplDX10_Data* bd = ImGui_ImplDX10_GetBackendData();
     ImGui_ImplDX10_ViewportData* vd = (ImGui_ImplDX10_ViewportData*)viewport->RendererUserData;
     ImVec4 clear_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f);
-    bd->pd3dDevice->OMSetRenderTargets(1, &vd->RTView, NULL);
+    bd->pd3dDevice->OMSetRenderTargets(1, &vd->RTView, nullptr);
     if (!(viewport->Flags & ImGuiViewportFlags_NoRendererClear))
         bd->pd3dDevice->ClearRenderTargetView(vd->RTView, (float*)&clear_color);
     ImGui_ImplDX10_RenderDrawData(viewport->DrawData);

backends/imgui_impl_dx11.cpp

@@ -14,6 +14,7 @@
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
 //  2022-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2022-10-11: Using 'nullptr' instead of 'NULL' as per our switch to C++11.
 //  2021-06-29: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX).
 //  2021-05-19: DirectX11: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement)
 //  2021-02-18: DirectX11: Change blending equation to preserve alpha in output buffer.
@@ -74,7 +75,7 @@ struct VERTEX_CONSTANT_BUFFER_DX11
 // It is STRONGLY preferred that you use docking branch with multi-viewports (== single Dear ImGui context + multiple windows) instead of multiple Dear ImGui contexts.
 static ImGui_ImplDX11_Data* ImGui_ImplDX11_GetBackendData()
 {
-    return ImGui::GetCurrentContext() ? (ImGui_ImplDX11_Data*)ImGui::GetIO().BackendRendererUserData : NULL;
+    return ImGui::GetCurrentContext() ? (ImGui_ImplDX11_Data*)ImGui::GetIO().BackendRendererUserData : nullptr;
 }
 
 // Forward Declarations
@@ -103,14 +104,14 @@ static void ImGui_ImplDX11_SetupRenderState(ImDrawData* draw_data, ID3D11DeviceC
     ctx->IASetVertexBuffers(0, 1, &bd->pVB, &stride, &offset);
     ctx->IASetIndexBuffer(bd->pIB, sizeof(ImDrawIdx) == 2 ? DXGI_FORMAT_R16_UINT : DXGI_FORMAT_R32_UINT, 0);
     ctx->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
-    ctx->VSSetShader(bd->pVertexShader, NULL, 0);
+    ctx->VSSetShader(bd->pVertexShader, nullptr, 0);
     ctx->VSSetConstantBuffers(0, 1, &bd->pVertexConstantBuffer);
-    ctx->PSSetShader(bd->pPixelShader, NULL, 0);
+    ctx->PSSetShader(bd->pPixelShader, nullptr, 0);
     ctx->PSSetSamplers(0, 1, &bd->pFontSampler);
-    ctx->GSSetShader(NULL, NULL, 0);
-    ctx->HSSetShader(NULL, NULL, 0); // In theory we should backup and restore this as well.. very infrequently used..
-    ctx->DSSetShader(NULL, NULL, 0); // In theory we should backup and restore this as well.. very infrequently used..
-    ctx->CSSetShader(NULL, NULL, 0); // In theory we should backup and restore this as well.. very infrequently used..
+    ctx->GSSetShader(nullptr, nullptr, 0);
+    ctx->HSSetShader(nullptr, nullptr, 0); // In theory we should backup and restore this as well.. very infrequently used..
+    ctx->DSSetShader(nullptr, nullptr, 0); // In theory we should backup and restore this as well.. very infrequently used..
+    ctx->CSSetShader(nullptr, nullptr, 0); // In theory we should backup and restore this as well.. very infrequently used..
 
     // Setup blend state
     const float blend_factor[4] = { 0.f, 0.f, 0.f, 0.f };
@@ -132,7 +133,7 @@ void ImGui_ImplDX11_RenderDrawData(ImDrawData* draw_data)
     // Create and grow vertex/index buffers if needed
     if (!bd->pVB || bd->VertexBufferSize < draw_data->TotalVtxCount)
     {
-        if (bd->pVB) { bd->pVB->Release(); bd->pVB = NULL; }
+        if (bd->pVB) { bd->pVB->Release(); bd->pVB = nullptr; }
         bd->VertexBufferSize = draw_data->TotalVtxCount + 5000;
         D3D11_BUFFER_DESC desc;
         memset(&desc, 0, sizeof(D3D11_BUFFER_DESC));
@@ -141,12 +142,12 @@ void ImGui_ImplDX11_RenderDrawData(ImDrawData* draw_data)
         desc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
         desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
         desc.MiscFlags = 0;
-        if (bd->pd3dDevice->CreateBuffer(&desc, NULL, &bd->pVB) < 0)
+        if (bd->pd3dDevice->CreateBuffer(&desc, nullptr, &bd->pVB) < 0)
             return;
     }
     if (!bd->pIB || bd->IndexBufferSize < draw_data->TotalIdxCount)
     {
-        if (bd->pIB) { bd->pIB->Release(); bd->pIB = NULL; }
+        if (bd->pIB) { bd->pIB->Release(); bd->pIB = nullptr; }
         bd->IndexBufferSize = draw_data->TotalIdxCount + 10000;
         D3D11_BUFFER_DESC desc;
         memset(&desc, 0, sizeof(D3D11_BUFFER_DESC));
@@ -154,7 +155,7 @@ void ImGui_ImplDX11_RenderDrawData(ImDrawData* draw_data)
         desc.ByteWidth = bd->IndexBufferSize * sizeof(ImDrawIdx);
         desc.BindFlags = D3D11_BIND_INDEX_BUFFER;
         desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
-        if (bd->pd3dDevice->CreateBuffer(&desc, NULL, &bd->pIB) < 0)
+        if (bd->pd3dDevice->CreateBuffer(&desc, nullptr, &bd->pIB) < 0)
             return;
     }
 
@@ -258,7 +259,7 @@ void ImGui_ImplDX11_RenderDrawData(ImDrawData* draw_data)
         for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
         {
             const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
-            if (pcmd->UserCallback != NULL)
+            if (pcmd->UserCallback != nullptr)
             {
                 // User callback, registered via ImDrawList::AddCallback()
                 // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
@@ -332,13 +333,13 @@ static void ImGui_ImplDX11_CreateFontsTexture()
         desc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
         desc.CPUAccessFlags = 0;
 
-        ID3D11Texture2D* pTexture = NULL;
+        ID3D11Texture2D* pTexture = nullptr;
         D3D11_SUBRESOURCE_DATA subResource;
         subResource.pSysMem = pixels;
         subResource.SysMemPitch = desc.Width * 4;
         subResource.SysMemSlicePitch = 0;
         bd->pd3dDevice->CreateTexture2D(&desc, &subResource, &pTexture);
-        IM_ASSERT(pTexture != NULL);
+        IM_ASSERT(pTexture != nullptr);
 
         // Create texture view
         D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc;
@@ -416,9 +417,9 @@ bool    ImGui_ImplDX11_CreateDeviceObjects()
             }";
 
         ID3DBlob* vertexShaderBlob;
-        if (FAILED(D3DCompile(vertexShader, strlen(vertexShader), NULL, NULL, NULL, "main", "vs_4_0", 0, 0, &vertexShaderBlob, NULL)))
+        if (FAILED(D3DCompile(vertexShader, strlen(vertexShader), nullptr, nullptr, nullptr, "main", "vs_4_0", 0, 0, &vertexShaderBlob, nullptr)))
             return false; // NB: Pass ID3DBlob* pErrorBlob to D3DCompile() to get error showing in (const char*)pErrorBlob->GetBufferPointer(). Make sure to Release() the blob!
-        if (bd->pd3dDevice->CreateVertexShader(vertexShaderBlob->GetBufferPointer(), vertexShaderBlob->GetBufferSize(), NULL, &bd->pVertexShader) != S_OK)
+        if (bd->pd3dDevice->CreateVertexShader(vertexShaderBlob->GetBufferPointer(), vertexShaderBlob->GetBufferSize(), nullptr, &bd->pVertexShader) != S_OK)
         {
             vertexShaderBlob->Release();
             return false;
@@ -446,7 +447,7 @@ bool    ImGui_ImplDX11_CreateDeviceObjects()
             desc.BindFlags = D3D11_BIND_CONSTANT_BUFFER;
             desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
             desc.MiscFlags = 0;
-            bd->pd3dDevice->CreateBuffer(&desc, NULL, &bd->pVertexConstantBuffer);
+            bd->pd3dDevice->CreateBuffer(&desc, nullptr, &bd->pVertexConstantBuffer);
         }
     }
 
@@ -469,9 +470,9 @@ bool    ImGui_ImplDX11_CreateDeviceObjects()
             }";
 
         ID3DBlob* pixelShaderBlob;
-        if (FAILED(D3DCompile(pixelShader, strlen(pixelShader), NULL, NULL, NULL, "main", "ps_4_0", 0, 0, &pixelShaderBlob, NULL)))
+        if (FAILED(D3DCompile(pixelShader, strlen(pixelShader), nullptr, nullptr, nullptr, "main", "ps_4_0", 0, 0, &pixelShaderBlob, nullptr)))
             return false; // NB: Pass ID3DBlob* pErrorBlob to D3DCompile() to get error showing in (const char*)pErrorBlob->GetBufferPointer(). Make sure to Release() the blob!
-        if (bd->pd3dDevice->CreatePixelShader(pixelShaderBlob->GetBufferPointer(), pixelShaderBlob->GetBufferSize(), NULL, &bd->pPixelShader) != S_OK)
+        if (bd->pd3dDevice->CreatePixelShader(pixelShaderBlob->GetBufferPointer(), pixelShaderBlob->GetBufferSize(), nullptr, &bd->pPixelShader) != S_OK)
         {
             pixelShaderBlob->Release();
             return false;
@@ -531,23 +532,23 @@ void    ImGui_ImplDX11_InvalidateDeviceObjects()
     if (!bd->pd3dDevice)
         return;
 
-    if (bd->pFontSampler)           { bd->pFontSampler->Release(); bd->pFontSampler = NULL; }
-    if (bd->pFontTextureView)       { bd->pFontTextureView->Release(); bd->pFontTextureView = NULL; ImGui::GetIO().Fonts->SetTexID(NULL); } // We copied data->pFontTextureView to io.Fonts->TexID so let's clear that as well.
-    if (bd->pIB)                    { bd->pIB->Release(); bd->pIB = NULL; }
-    if (bd->pVB)                    { bd->pVB->Release(); bd->pVB = NULL; }
-    if (bd->pBlendState)            { bd->pBlendState->Release(); bd->pBlendState = NULL; }
-    if (bd->pDepthStencilState)     { bd->pDepthStencilState->Release(); bd->pDepthStencilState = NULL; }
-    if (bd->pRasterizerState)       { bd->pRasterizerState->Release(); bd->pRasterizerState = NULL; }
-    if (bd->pPixelShader)           { bd->pPixelShader->Release(); bd->pPixelShader = NULL; }
-    if (bd->pVertexConstantBuffer)  { bd->pVertexConstantBuffer->Release(); bd->pVertexConstantBuffer = NULL; }
-    if (bd->pInputLayout)           { bd->pInputLayout->Release(); bd->pInputLayout = NULL; }
-    if (bd->pVertexShader)          { bd->pVertexShader->Release(); bd->pVertexShader = NULL; }
+    if (bd->pFontSampler)           { bd->pFontSampler->Release(); bd->pFontSampler = nullptr; }
+    if (bd->pFontTextureView)       { bd->pFontTextureView->Release(); bd->pFontTextureView = nullptr; ImGui::GetIO().Fonts->SetTexID(0); } // We copied data->pFontTextureView to io.Fonts->TexID so let's clear that as well.
+    if (bd->pIB)                    { bd->pIB->Release(); bd->pIB = nullptr; }
+    if (bd->pVB)                    { bd->pVB->Release(); bd->pVB = nullptr; }
+    if (bd->pBlendState)            { bd->pBlendState->Release(); bd->pBlendState = nullptr; }
+    if (bd->pDepthStencilState)     { bd->pDepthStencilState->Release(); bd->pDepthStencilState = nullptr; }
+    if (bd->pRasterizerState)       { bd->pRasterizerState->Release(); bd->pRasterizerState = nullptr; }
+    if (bd->pPixelShader)           { bd->pPixelShader->Release(); bd->pPixelShader = nullptr; }
+    if (bd->pVertexConstantBuffer)  { bd->pVertexConstantBuffer->Release(); bd->pVertexConstantBuffer = nullptr; }
+    if (bd->pInputLayout)           { bd->pInputLayout->Release(); bd->pInputLayout = nullptr; }
+    if (bd->pVertexShader)          { bd->pVertexShader->Release(); bd->pVertexShader = nullptr; }
 }
 
 bool    ImGui_ImplDX11_Init(ID3D11Device* device, ID3D11DeviceContext* device_context)
 {
     ImGuiIO& io = ImGui::GetIO();
-    IM_ASSERT(io.BackendRendererUserData == NULL && "Already initialized a renderer backend!");
+    IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
 
     // Setup backend capabilities flags
     ImGui_ImplDX11_Data* bd = IM_NEW(ImGui_ImplDX11_Data)();
@@ -557,9 +558,9 @@ bool    ImGui_ImplDX11_Init(ID3D11Device* device, ID3D11DeviceContext* device_co
     io.BackendFlags |= ImGuiBackendFlags_RendererHasViewports;  // We can create multi-viewports on the Renderer side (optional)
 
     // Get factory from device
-    IDXGIDevice* pDXGIDevice = NULL;
-    IDXGIAdapter* pDXGIAdapter = NULL;
-    IDXGIFactory* pFactory = NULL;
+    IDXGIDevice* pDXGIDevice = nullptr;
+    IDXGIAdapter* pDXGIAdapter = nullptr;
+    IDXGIFactory* pFactory = nullptr;
 
     if (device->QueryInterface(IID_PPV_ARGS(&pDXGIDevice)) == S_OK)
         if (pDXGIDevice->GetParent(IID_PPV_ARGS(&pDXGIAdapter)) == S_OK)
@@ -583,7 +584,7 @@ bool    ImGui_ImplDX11_Init(ID3D11Device* device, ID3D11DeviceContext* device_co
 void ImGui_ImplDX11_Shutdown()
 {
     ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
-    IM_ASSERT(bd != NULL && "No renderer backend to shutdown, or already shutdown?");
+    IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?");
     ImGuiIO& io = ImGui::GetIO();
 
     ImGui_ImplDX11_ShutdownPlatformInterface();
@@ -591,15 +592,15 @@ void ImGui_ImplDX11_Shutdown()
     if (bd->pFactory)             { bd->pFactory->Release(); }
     if (bd->pd3dDevice)           { bd->pd3dDevice->Release(); }
     if (bd->pd3dDeviceContext)    { bd->pd3dDeviceContext->Release(); }
-    io.BackendRendererName = NULL;
-    io.BackendRendererUserData = NULL;
+    io.BackendRendererName = nullptr;
+    io.BackendRendererUserData = nullptr;
     IM_DELETE(bd);
 }
 
 void ImGui_ImplDX11_NewFrame()
 {
     ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
-    IM_ASSERT(bd != NULL && "Did you call ImGui_ImplDX11_Init()?");
+    IM_ASSERT(bd != nullptr && "Did you call ImGui_ImplDX11_Init()?");
 
     if (!bd->pFontSampler)
         ImGui_ImplDX11_CreateDeviceObjects();
@@ -617,8 +618,8 @@ struct ImGui_ImplDX11_ViewportData
     IDXGISwapChain*                 SwapChain;
     ID3D11RenderTargetView*         RTView;
 
-    ImGui_ImplDX11_ViewportData()   { SwapChain = NULL; RTView = NULL; }
-    ~ImGui_ImplDX11_ViewportData()  { IM_ASSERT(SwapChain == NULL && RTView == NULL); }
+    ImGui_ImplDX11_ViewportData()   { SwapChain = nullptr; RTView = nullptr; }
+    ~ImGui_ImplDX11_ViewportData()  { IM_ASSERT(SwapChain == nullptr && RTView == nullptr); }
 };
 
 static void ImGui_ImplDX11_CreateWindow(ImGuiViewport* viewport)
@@ -628,7 +629,7 @@ static void ImGui_ImplDX11_CreateWindow(ImGuiViewport* viewport)
     viewport->RendererUserData = vd;
 
     // PlatformHandleRaw should always be a HWND, whereas PlatformHandle might be a higher-level handle (e.g. GLFWWindow*, SDL_Window*).
-    // Some backend will leave PlatformHandleRaw NULL, in which case we assume PlatformHandle will contain the HWND.
+    // Some backends will leave PlatformHandleRaw NULL, in which case we assume PlatformHandle will contain the HWND.
     HWND hwnd = viewport->PlatformHandleRaw ? (HWND)viewport->PlatformHandleRaw : (HWND)viewport->PlatformHandle;
     IM_ASSERT(hwnd != 0);
 
@@ -647,7 +648,7 @@ static void ImGui_ImplDX11_CreateWindow(ImGuiViewport* viewport)
     sd.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;
     sd.Flags = 0;
 
-    IM_ASSERT(vd->SwapChain == NULL && vd->RTView == NULL);
+    IM_ASSERT(vd->SwapChain == nullptr && vd->RTView == nullptr);
     bd->pFactory->CreateSwapChain(bd->pd3dDevice, &sd, &vd->SwapChain);
 
     // Create the render target
@@ -655,25 +656,25 @@ static void ImGui_ImplDX11_CreateWindow(ImGuiViewport* viewport)
     {
         ID3D11Texture2D* pBackBuffer;
         vd->SwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
-        bd->pd3dDevice->CreateRenderTargetView(pBackBuffer, NULL, &vd->RTView);
+        bd->pd3dDevice->CreateRenderTargetView(pBackBuffer, nullptr, &vd->RTView);
         pBackBuffer->Release();
     }
 }
 
 static void ImGui_ImplDX11_DestroyWindow(ImGuiViewport* viewport)
 {
-    // The main viewport (owned by the application) will always have RendererUserData == NULL since we didn't create the data for it.
+    // The main viewport (owned by the application) will always have RendererUserData == nullptr since we didn't create the data for it.
     if (ImGui_ImplDX11_ViewportData* vd = (ImGui_ImplDX11_ViewportData*)viewport->RendererUserData)
     {
         if (vd->SwapChain)
             vd->SwapChain->Release();
-        vd->SwapChain = NULL;
+        vd->SwapChain = nullptr;
         if (vd->RTView)
             vd->RTView->Release();
-        vd->RTView = NULL;
+        vd->RTView = nullptr;
         IM_DELETE(vd);
     }
-    viewport->RendererUserData = NULL;
+    viewport->RendererUserData = nullptr;
 }
 
 static void ImGui_ImplDX11_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
@@ -683,15 +684,15 @@ static void ImGui_ImplDX11_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
     if (vd->RTView)
     {
         vd->RTView->Release();
-        vd->RTView = NULL;
+        vd->RTView = nullptr;
     }
     if (vd->SwapChain)
     {
-        ID3D11Texture2D* pBackBuffer = NULL;
+        ID3D11Texture2D* pBackBuffer = nullptr;
         vd->SwapChain->ResizeBuffers(0, (UINT)size.x, (UINT)size.y, DXGI_FORMAT_UNKNOWN, 0);
         vd->SwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
-        if (pBackBuffer == NULL) { fprintf(stderr, "ImGui_ImplDX11_SetWindowSize() failed creating buffers.\n"); return; }
-        bd->pd3dDevice->CreateRenderTargetView(pBackBuffer, NULL, &vd->RTView);
+        if (pBackBuffer == nullptr) { fprintf(stderr, "ImGui_ImplDX11_SetWindowSize() failed creating buffers.\n"); return; }
+        bd->pd3dDevice->CreateRenderTargetView(pBackBuffer, nullptr, &vd->RTView);
         pBackBuffer->Release();
     }
 }
@@ -701,7 +702,7 @@ static void ImGui_ImplDX11_RenderWindow(ImGuiViewport* viewport, void*)
     ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
     ImGui_ImplDX11_ViewportData* vd = (ImGui_ImplDX11_ViewportData*)viewport->RendererUserData;
     ImVec4 clear_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f);
-    bd->pd3dDeviceContext->OMSetRenderTargets(1, &vd->RTView, NULL);
+    bd->pd3dDeviceContext->OMSetRenderTargets(1, &vd->RTView, nullptr);
     if (!(viewport->Flags & ImGuiViewportFlags_NoRendererClear))
         bd->pd3dDeviceContext->ClearRenderTargetView(vd->RTView, (float*)&clear_color);
     ImGui_ImplDX11_RenderDrawData(viewport->DrawData);

backends/imgui_impl_dx12.cpp

@@ -23,6 +23,7 @@
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
 //  2022-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2022-10-11: Using 'nullptr' instead of 'NULL' as per our switch to C++11.
 //  2021-06-29: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX).
 //  2021-05-19: DirectX12: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement)
 //  2021-02-18: DirectX12: Change blending equation to preserve alpha in output buffer.
@@ -71,7 +72,7 @@ struct ImGui_ImplDX12_Data
 // It is STRONGLY preferred that you use docking branch with multi-viewports (== single Dear ImGui context + multiple windows) instead of multiple Dear ImGui contexts.
 static ImGui_ImplDX12_Data* ImGui_ImplDX12_GetBackendData()
 {
-    return ImGui::GetCurrentContext() ? (ImGui_ImplDX12_Data*)ImGui::GetIO().BackendRendererUserData : NULL;
+    return ImGui::GetCurrentContext() ? (ImGui_ImplDX12_Data*)ImGui::GetIO().BackendRendererUserData : nullptr;
 }
 
 // Buffers used during the rendering of a frame
@@ -113,13 +114,13 @@ struct ImGui_ImplDX12_ViewportData
 
     ImGui_ImplDX12_ViewportData(UINT num_frames_in_flight)
     {
-        CommandQueue = NULL;
-        CommandList = NULL;
-        RtvDescHeap = NULL;
-        SwapChain = NULL;
-        Fence = NULL;
+        CommandQueue = nullptr;
+        CommandList = nullptr;
+        RtvDescHeap = nullptr;
+        SwapChain = nullptr;
+        Fence = nullptr;
         FenceSignaledValue = 0;
-        FenceEvent = NULL;
+        FenceEvent = nullptr;
         NumFramesInFlight = num_frames_in_flight;
         FrameCtx = new ImGui_ImplDX12_FrameContext[NumFramesInFlight];
         FrameIndex = UINT_MAX;
@@ -127,32 +128,32 @@ struct ImGui_ImplDX12_ViewportData
 
         for (UINT i = 0; i < NumFramesInFlight; ++i)
         {
-            FrameCtx[i].CommandAllocator = NULL;
-            FrameCtx[i].RenderTarget = NULL;
+            FrameCtx[i].CommandAllocator = nullptr;
+            FrameCtx[i].RenderTarget = nullptr;
 
             // Create buffers with a default size (they will later be grown as needed)
-            FrameRenderBuffers[i].IndexBuffer = NULL;
-            FrameRenderBuffers[i].VertexBuffer = NULL;
+            FrameRenderBuffers[i].IndexBuffer = nullptr;
+            FrameRenderBuffers[i].VertexBuffer = nullptr;
             FrameRenderBuffers[i].VertexBufferSize = 5000;
             FrameRenderBuffers[i].IndexBufferSize = 10000;
         }
     }
     ~ImGui_ImplDX12_ViewportData()
     {
-        IM_ASSERT(CommandQueue == NULL && CommandList == NULL);
-        IM_ASSERT(RtvDescHeap == NULL);
-        IM_ASSERT(SwapChain == NULL);
-        IM_ASSERT(Fence == NULL);
-        IM_ASSERT(FenceEvent == NULL);
+        IM_ASSERT(CommandQueue == nullptr && CommandList == nullptr);
+        IM_ASSERT(RtvDescHeap == nullptr);
+        IM_ASSERT(SwapChain == nullptr);
+        IM_ASSERT(Fence == nullptr);
+        IM_ASSERT(FenceEvent == nullptr);
 
         for (UINT i = 0; i < NumFramesInFlight; ++i)
         {
-            IM_ASSERT(FrameCtx[i].CommandAllocator == NULL && FrameCtx[i].RenderTarget == NULL);
-            IM_ASSERT(FrameRenderBuffers[i].IndexBuffer == NULL && FrameRenderBuffers[i].VertexBuffer == NULL);
+            IM_ASSERT(FrameCtx[i].CommandAllocator == nullptr && FrameCtx[i].RenderTarget == nullptr);
+            IM_ASSERT(FrameRenderBuffers[i].IndexBuffer == nullptr && FrameRenderBuffers[i].VertexBuffer == nullptr);
         }
 
-        delete[] FrameCtx; FrameCtx = NULL;
-        delete[] FrameRenderBuffers; FrameRenderBuffers = NULL;
+        delete[] FrameCtx; FrameCtx = nullptr;
+        delete[] FrameRenderBuffers; FrameRenderBuffers = nullptr;
     }
 };
 
@@ -228,7 +229,7 @@ static inline void SafeRelease(T*& res)
 {
     if (res)
         res->Release();
-    res = NULL;
+    res = nullptr;
 }
 
 // Render function
@@ -244,7 +245,7 @@ void ImGui_ImplDX12_RenderDrawData(ImDrawData* draw_data, ID3D12GraphicsCommandL
     ImGui_ImplDX12_RenderBuffers* fr = &vd->FrameRenderBuffers[vd->FrameIndex % bd->numFramesInFlight];
 
     // Create and grow vertex/index buffers if needed
-    if (fr->VertexBuffer == NULL || fr->VertexBufferSize < draw_data->TotalVtxCount)
+    if (fr->VertexBuffer == nullptr || fr->VertexBufferSize < draw_data->TotalVtxCount)
     {
         SafeRelease(fr->VertexBuffer);
         fr->VertexBufferSize = draw_data->TotalVtxCount + 5000;
@@ -264,10 +265,10 @@ void ImGui_ImplDX12_RenderDrawData(ImDrawData* draw_data, ID3D12GraphicsCommandL
         desc.SampleDesc.Count = 1;
         desc.Layout = D3D12_TEXTURE_LAYOUT_ROW_MAJOR;
         desc.Flags = D3D12_RESOURCE_FLAG_NONE;
-        if (bd->pd3dDevice->CreateCommittedResource(&props, D3D12_HEAP_FLAG_NONE, &desc, D3D12_RESOURCE_STATE_GENERIC_READ, NULL, IID_PPV_ARGS(&fr->VertexBuffer)) < 0)
+        if (bd->pd3dDevice->CreateCommittedResource(&props, D3D12_HEAP_FLAG_NONE, &desc, D3D12_RESOURCE_STATE_GENERIC_READ, nullptr, IID_PPV_ARGS(&fr->VertexBuffer)) < 0)
             return;
     }
-    if (fr->IndexBuffer == NULL || fr->IndexBufferSize < draw_data->TotalIdxCount)
+    if (fr->IndexBuffer == nullptr || fr->IndexBufferSize < draw_data->TotalIdxCount)
     {
         SafeRelease(fr->IndexBuffer);
         fr->IndexBufferSize = draw_data->TotalIdxCount + 10000;
@@ -287,7 +288,7 @@ void ImGui_ImplDX12_RenderDrawData(ImDrawData* draw_data, ID3D12GraphicsCommandL
         desc.SampleDesc.Count = 1;
         desc.Layout = D3D12_TEXTURE_LAYOUT_ROW_MAJOR;
         desc.Flags = D3D12_RESOURCE_FLAG_NONE;
-        if (bd->pd3dDevice->CreateCommittedResource(&props, D3D12_HEAP_FLAG_NONE, &desc, D3D12_RESOURCE_STATE_GENERIC_READ, NULL, IID_PPV_ARGS(&fr->IndexBuffer)) < 0)
+        if (bd->pd3dDevice->CreateCommittedResource(&props, D3D12_HEAP_FLAG_NONE, &desc, D3D12_RESOURCE_STATE_GENERIC_READ, nullptr, IID_PPV_ARGS(&fr->IndexBuffer)) < 0)
             return;
     }
 
@@ -326,7 +327,7 @@ void ImGui_ImplDX12_RenderDrawData(ImDrawData* draw_data, ID3D12GraphicsCommandL
         for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
         {
             const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
-            if (pcmd->UserCallback != NULL)
+            if (pcmd->UserCallback != nullptr)
             {
                 // User callback, registered via ImDrawList::AddCallback()
                 // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
@@ -388,9 +389,9 @@ static void ImGui_ImplDX12_CreateFontsTexture()
         desc.Layout = D3D12_TEXTURE_LAYOUT_UNKNOWN;
         desc.Flags = D3D12_RESOURCE_FLAG_NONE;
 
-        ID3D12Resource* pTexture = NULL;
+        ID3D12Resource* pTexture = nullptr;
         bd->pd3dDevice->CreateCommittedResource(&props, D3D12_HEAP_FLAG_NONE, &desc,
-            D3D12_RESOURCE_STATE_COPY_DEST, NULL, IID_PPV_ARGS(&pTexture));
+            D3D12_RESOURCE_STATE_COPY_DEST, nullptr, IID_PPV_ARGS(&pTexture));
 
         UINT uploadPitch = (width * 4 + D3D12_TEXTURE_DATA_PITCH_ALIGNMENT - 1u) & ~(D3D12_TEXTURE_DATA_PITCH_ALIGNMENT - 1u);
         UINT uploadSize = height * uploadPitch;
@@ -410,12 +411,12 @@ static void ImGui_ImplDX12_CreateFontsTexture()
         props.CPUPageProperty = D3D12_CPU_PAGE_PROPERTY_UNKNOWN;
         props.MemoryPoolPreference = D3D12_MEMORY_POOL_UNKNOWN;
 
-        ID3D12Resource* uploadBuffer = NULL;
+        ID3D12Resource* uploadBuffer = nullptr;
         HRESULT hr = bd->pd3dDevice->CreateCommittedResource(&props, D3D12_HEAP_FLAG_NONE, &desc,
-            D3D12_RESOURCE_STATE_GENERIC_READ, NULL, IID_PPV_ARGS(&uploadBuffer));
+            D3D12_RESOURCE_STATE_GENERIC_READ, nullptr, IID_PPV_ARGS(&uploadBuffer));
         IM_ASSERT(SUCCEEDED(hr));
 
-        void* mapped = NULL;
+        void* mapped = nullptr;
         D3D12_RANGE range = { 0, uploadSize };
         hr = uploadBuffer->Map(0, &range, &mapped);
         IM_ASSERT(SUCCEEDED(hr));
@@ -445,31 +446,31 @@ static void ImGui_ImplDX12_CreateFontsTexture()
         barrier.Transition.StateBefore = D3D12_RESOURCE_STATE_COPY_DEST;
         barrier.Transition.StateAfter  = D3D12_RESOURCE_STATE_PIXEL_SHADER_RESOURCE;
 
-        ID3D12Fence* fence = NULL;
+        ID3D12Fence* fence = nullptr;
         hr = bd->pd3dDevice->CreateFence(0, D3D12_FENCE_FLAG_NONE, IID_PPV_ARGS(&fence));
         IM_ASSERT(SUCCEEDED(hr));
 
         HANDLE event = CreateEvent(0, 0, 0, 0);
-        IM_ASSERT(event != NULL);
+        IM_ASSERT(event != nullptr);
 
         D3D12_COMMAND_QUEUE_DESC queueDesc = {};
         queueDesc.Type     = D3D12_COMMAND_LIST_TYPE_DIRECT;
         queueDesc.Flags    = D3D12_COMMAND_QUEUE_FLAG_NONE;
         queueDesc.NodeMask = 1;
 
-        ID3D12CommandQueue* cmdQueue = NULL;
+        ID3D12CommandQueue* cmdQueue = nullptr;
         hr = bd->pd3dDevice->CreateCommandQueue(&queueDesc, IID_PPV_ARGS(&cmdQueue));
         IM_ASSERT(SUCCEEDED(hr));
 
-        ID3D12CommandAllocator* cmdAlloc = NULL;
+        ID3D12CommandAllocator* cmdAlloc = nullptr;
         hr = bd->pd3dDevice->CreateCommandAllocator(D3D12_COMMAND_LIST_TYPE_DIRECT, IID_PPV_ARGS(&cmdAlloc));
         IM_ASSERT(SUCCEEDED(hr));
 
-        ID3D12GraphicsCommandList* cmdList = NULL;
-        hr = bd->pd3dDevice->CreateCommandList(0, D3D12_COMMAND_LIST_TYPE_DIRECT, cmdAlloc, NULL, IID_PPV_ARGS(&cmdList));
+        ID3D12GraphicsCommandList* cmdList = nullptr;
+        hr = bd->pd3dDevice->CreateCommandList(0, D3D12_COMMAND_LIST_TYPE_DIRECT, cmdAlloc, nullptr, IID_PPV_ARGS(&cmdList));
         IM_ASSERT(SUCCEEDED(hr));
 
-        cmdList->CopyTextureRegion(&dstLocation, 0, 0, 0, &srcLocation, NULL);
+        cmdList->CopyTextureRegion(&dstLocation, 0, 0, 0, &srcLocation, nullptr);
         cmdList->ResourceBarrier(1, &barrier);
 
         hr = cmdList->Close();
@@ -574,7 +575,7 @@ bool    ImGui_ImplDX12_CreateDeviceObjects()
         // Load d3d12.dll and D3D12SerializeRootSignature() function address dynamically to facilitate using with D3D12On7.
         // See if any version of d3d12.dll is already loaded in the process. If so, give preference to that.
         static HINSTANCE d3d12_dll = ::GetModuleHandleA("d3d12.dll");
-        if (d3d12_dll == NULL)
+        if (d3d12_dll == nullptr)
         {
             // Attempt to load d3d12.dll from local directories. This will only succeed if
             // (1) the current OS is Windows 7, and
@@ -582,23 +583,23 @@ bool    ImGui_ImplDX12_CreateDeviceObjects()
             // See https://github.com/ocornut/imgui/pull/3696 for details.
             const char* localD3d12Paths[] = { ".\\d3d12.dll", ".\\d3d12on7\\d3d12.dll", ".\\12on7\\d3d12.dll" }; // A. current directory, B. used by some games, C. used in Microsoft D3D12On7 sample
             for (int i = 0; i < IM_ARRAYSIZE(localD3d12Paths); i++)
-                if ((d3d12_dll = ::LoadLibraryA(localD3d12Paths[i])) != NULL)
+                if ((d3d12_dll = ::LoadLibraryA(localD3d12Paths[i])) != nullptr)
                     break;
 
             // If failed, we are on Windows >= 10.
-            if (d3d12_dll == NULL)
+            if (d3d12_dll == nullptr)
                 d3d12_dll = ::LoadLibraryA("d3d12.dll");
 
-            if (d3d12_dll == NULL)
+            if (d3d12_dll == nullptr)
                 return false;
         }
 
         PFN_D3D12_SERIALIZE_ROOT_SIGNATURE D3D12SerializeRootSignatureFn = (PFN_D3D12_SERIALIZE_ROOT_SIGNATURE)::GetProcAddress(d3d12_dll, "D3D12SerializeRootSignature");
-        if (D3D12SerializeRootSignatureFn == NULL)
+        if (D3D12SerializeRootSignatureFn == nullptr)
             return false;
 
-        ID3DBlob* blob = NULL;
-        if (D3D12SerializeRootSignatureFn(&desc, D3D_ROOT_SIGNATURE_VERSION_1, &blob, NULL) != S_OK)
+        ID3DBlob* blob = nullptr;
+        if (D3D12SerializeRootSignatureFn(&desc, D3D_ROOT_SIGNATURE_VERSION_1, &blob, nullptr) != S_OK)
             return false;
 
         bd->pd3dDevice->CreateRootSignature(0, blob->GetBufferPointer(), blob->GetBufferSize(), IID_PPV_ARGS(&bd->pRootSignature));
@@ -655,7 +656,7 @@ bool    ImGui_ImplDX12_CreateDeviceObjects()
               return output;\
             }";
 
-        if (FAILED(D3DCompile(vertexShader, strlen(vertexShader), NULL, NULL, NULL, "main", "vs_5_0", 0, 0, &vertexShaderBlob, NULL)))
+        if (FAILED(D3DCompile(vertexShader, strlen(vertexShader), nullptr, nullptr, nullptr, "main", "vs_5_0", 0, 0, &vertexShaderBlob, nullptr)))
             return false; // NB: Pass ID3D10Blob* pErrorBlob to D3DCompile() to get error showing in (const char*)pErrorBlob->GetBufferPointer(). Make sure to Release() the blob!
         psoDesc.VS = { vertexShaderBlob->GetBufferPointer(), vertexShaderBlob->GetBufferSize() };
 
@@ -687,7 +688,7 @@ bool    ImGui_ImplDX12_CreateDeviceObjects()
               return out_col; \
             }";
 
-        if (FAILED(D3DCompile(pixelShader, strlen(pixelShader), NULL, NULL, NULL, "main", "ps_5_0", 0, 0, &pixelShaderBlob, NULL)))
+        if (FAILED(D3DCompile(pixelShader, strlen(pixelShader), nullptr, nullptr, nullptr, "main", "ps_5_0", 0, 0, &pixelShaderBlob, nullptr)))
         {
             vertexShaderBlob->Release();
             return false; // NB: Pass ID3D10Blob* pErrorBlob to D3DCompile() to get error showing in (const char*)pErrorBlob->GetBufferPointer(). Make sure to Release() the blob!
@@ -765,14 +766,14 @@ void    ImGui_ImplDX12_InvalidateDeviceObjects()
     SafeRelease(bd->pRootSignature);
     SafeRelease(bd->pPipelineState);
     SafeRelease(bd->pFontTextureResource);
-    io.Fonts->SetTexID(NULL); // We copied bd->pFontTextureView to io.Fonts->TexID so let's clear that as well.
+    io.Fonts->SetTexID(0); // We copied bd->pFontTextureView to io.Fonts->TexID so let's clear that as well.
 }
 
 bool ImGui_ImplDX12_Init(ID3D12Device* device, int num_frames_in_flight, DXGI_FORMAT rtv_format, ID3D12DescriptorHeap* cbv_srv_heap,
                          D3D12_CPU_DESCRIPTOR_HANDLE font_srv_cpu_desc_handle, D3D12_GPU_DESCRIPTOR_HANDLE font_srv_gpu_desc_handle)
 {
     ImGuiIO& io = ImGui::GetIO();
-    IM_ASSERT(io.BackendRendererUserData == NULL && "Already initialized a renderer backend!");
+    IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
 
     // Setup backend capabilities flags
     ImGui_ImplDX12_Data* bd = IM_NEW(ImGui_ImplDX12_Data)();
@@ -801,7 +802,7 @@ bool ImGui_ImplDX12_Init(ID3D12Device* device, int num_frames_in_flight, DXGI_FO
 void ImGui_ImplDX12_Shutdown()
 {
     ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData();
-    IM_ASSERT(bd != NULL && "No renderer backend to shutdown, or already shutdown?");
+    IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?");
     ImGuiIO& io = ImGui::GetIO();
 
     // Manually delete main viewport render resources in-case we haven't initialized for viewports
@@ -812,22 +813,22 @@ void ImGui_ImplDX12_Shutdown()
         for (UINT i = 0; i < bd->numFramesInFlight; i++)
             ImGui_ImplDX12_DestroyRenderBuffers(&vd->FrameRenderBuffers[i]);
         IM_DELETE(vd);
-        main_viewport->RendererUserData = NULL;
+        main_viewport->RendererUserData = nullptr;
     }
 
     // Clean up windows and device objects
     ImGui_ImplDX12_ShutdownPlatformInterface();
     ImGui_ImplDX12_InvalidateDeviceObjects();
 
-    io.BackendRendererName = NULL;
-    io.BackendRendererUserData = NULL;
+    io.BackendRendererName = nullptr;
+    io.BackendRendererUserData = nullptr;
     IM_DELETE(bd);
 }
 
 void ImGui_ImplDX12_NewFrame()
 {
     ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData();
-    IM_ASSERT(bd != NULL && "Did you call ImGui_ImplDX12_Init()?");
+    IM_ASSERT(bd != nullptr && "Did you call ImGui_ImplDX12_Init()?");
 
     if (!bd->pPipelineState)
         ImGui_ImplDX12_CreateDeviceObjects();
@@ -869,7 +870,7 @@ static void ImGui_ImplDX12_CreateWindow(ImGuiViewport* viewport)
     }
 
     // Create command list.
-    res = bd->pd3dDevice->CreateCommandList(0, D3D12_COMMAND_LIST_TYPE_DIRECT, vd->FrameCtx[0].CommandAllocator, NULL, IID_PPV_ARGS(&vd->CommandList));
+    res = bd->pd3dDevice->CreateCommandList(0, D3D12_COMMAND_LIST_TYPE_DIRECT, vd->FrameCtx[0].CommandAllocator, nullptr, IID_PPV_ARGS(&vd->CommandList));
     IM_ASSERT(res == S_OK);
     vd->CommandList->Close();
 
@@ -877,8 +878,8 @@ static void ImGui_ImplDX12_CreateWindow(ImGuiViewport* viewport)
     res = bd->pd3dDevice->CreateFence(0, D3D12_FENCE_FLAG_NONE, IID_PPV_ARGS(&vd->Fence));
     IM_ASSERT(res == S_OK);
 
-    vd->FenceEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
-    IM_ASSERT(vd->FenceEvent != NULL);
+    vd->FenceEvent = CreateEvent(nullptr, FALSE, FALSE, nullptr);
+    IM_ASSERT(vd->FenceEvent != nullptr);
 
     // Create swap chain
     // FIXME-VIEWPORT: May want to copy/inherit swap chain settings from the user/application.
@@ -896,18 +897,18 @@ static void ImGui_ImplDX12_CreateWindow(ImGuiViewport* viewport)
     sd1.Scaling = DXGI_SCALING_STRETCH;
     sd1.Stereo = FALSE;
 
-    IDXGIFactory4* dxgi_factory = NULL;
+    IDXGIFactory4* dxgi_factory = nullptr;
     res = ::CreateDXGIFactory1(IID_PPV_ARGS(&dxgi_factory));
     IM_ASSERT(res == S_OK);
 
-    IDXGISwapChain1* swap_chain = NULL;
-    res = dxgi_factory->CreateSwapChainForHwnd(vd->CommandQueue, hwnd, &sd1, NULL, NULL, &swap_chain);
+    IDXGISwapChain1* swap_chain = nullptr;
+    res = dxgi_factory->CreateSwapChainForHwnd(vd->CommandQueue, hwnd, &sd1, nullptr, nullptr, &swap_chain);
     IM_ASSERT(res == S_OK);
 
     dxgi_factory->Release();
 
     // Or swapChain.As(&mSwapChain)
-    IM_ASSERT(vd->SwapChain == NULL);
+    IM_ASSERT(vd->SwapChain == nullptr);
     swap_chain->QueryInterface(IID_PPV_ARGS(&vd->SwapChain));
     swap_chain->Release();
 
@@ -934,9 +935,9 @@ static void ImGui_ImplDX12_CreateWindow(ImGuiViewport* viewport)
         ID3D12Resource* back_buffer;
         for (UINT i = 0; i < bd->numFramesInFlight; i++)
         {
-            IM_ASSERT(vd->FrameCtx[i].RenderTarget == NULL);
+            IM_ASSERT(vd->FrameCtx[i].RenderTarget == nullptr);
             vd->SwapChain->GetBuffer(i, IID_PPV_ARGS(&back_buffer));
-            bd->pd3dDevice->CreateRenderTargetView(back_buffer, NULL, vd->FrameCtx[i].RenderTargetCpuDescriptors);
+            bd->pd3dDevice->CreateRenderTargetView(back_buffer, nullptr, vd->FrameCtx[i].RenderTargetCpuDescriptors);
             vd->FrameCtx[i].RenderTarget = back_buffer;
         }
     }
@@ -973,7 +974,7 @@ static void ImGui_ImplDX12_DestroyWindow(ImGuiViewport* viewport)
         SafeRelease(vd->RtvDescHeap);
         SafeRelease(vd->Fence);
         ::CloseHandle(vd->FenceEvent);
-        vd->FenceEvent = NULL;
+        vd->FenceEvent = nullptr;
 
         for (UINT i = 0; i < bd->numFramesInFlight; i++)
         {
@@ -983,7 +984,7 @@ static void ImGui_ImplDX12_DestroyWindow(ImGuiViewport* viewport)
         }
         IM_DELETE(vd);
     }
-    viewport->RendererUserData = NULL;
+    viewport->RendererUserData = nullptr;
 }
 
 static void ImGui_ImplDX12_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
@@ -998,12 +999,12 @@ static void ImGui_ImplDX12_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
 
     if (vd->SwapChain)
     {
-        ID3D12Resource* back_buffer = NULL;
+        ID3D12Resource* back_buffer = nullptr;
         vd->SwapChain->ResizeBuffers(0, (UINT)size.x, (UINT)size.y, DXGI_FORMAT_UNKNOWN, 0);
         for (UINT i = 0; i < bd->numFramesInFlight; i++)
         {
             vd->SwapChain->GetBuffer(i, IID_PPV_ARGS(&back_buffer));
-            bd->pd3dDevice->CreateRenderTargetView(back_buffer, NULL, vd->FrameCtx[i].RenderTargetCpuDescriptors);
+            bd->pd3dDevice->CreateRenderTargetView(back_buffer, nullptr, vd->FrameCtx[i].RenderTargetCpuDescriptors);
             vd->FrameCtx[i].RenderTarget = back_buffer;
         }
     }
@@ -1030,11 +1031,11 @@ static void ImGui_ImplDX12_RenderWindow(ImGuiViewport* viewport, void*)
     ID3D12GraphicsCommandList* cmd_list = vd->CommandList;
 
     frame_context->CommandAllocator->Reset();
-    cmd_list->Reset(frame_context->CommandAllocator, NULL);
+    cmd_list->Reset(frame_context->CommandAllocator, nullptr);
     cmd_list->ResourceBarrier(1, &barrier);
-    cmd_list->OMSetRenderTargets(1, &vd->FrameCtx[back_buffer_idx].RenderTargetCpuDescriptors, FALSE, NULL);
+    cmd_list->OMSetRenderTargets(1, &vd->FrameCtx[back_buffer_idx].RenderTargetCpuDescriptors, FALSE, nullptr);
     if (!(viewport->Flags & ImGuiViewportFlags_NoRendererClear))
-        cmd_list->ClearRenderTargetView(vd->FrameCtx[back_buffer_idx].RenderTargetCpuDescriptors, (float*)&clear_color, 0, NULL);
+        cmd_list->ClearRenderTargetView(vd->FrameCtx[back_buffer_idx].RenderTargetCpuDescriptors, (float*)&clear_color, 0, nullptr);
     cmd_list->SetDescriptorHeaps(1, &bd->pd3dSrvDescHeap);
 
     ImGui_ImplDX12_RenderDrawData(viewport->DrawData, cmd_list);

backends/imgui_impl_dx9.cpp

@@ -14,6 +14,7 @@
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
 //  2022-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2022-10-11: Using 'nullptr' instead of 'NULL' as per our switch to C++11.
 //  2021-06-29: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX).
 //  2021-06-25: DirectX9: Explicitly disable texture state stages after >= 1.
 //  2021-05-19: DirectX9: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement)
@@ -69,7 +70,7 @@ struct CUSTOMVERTEX
 // It is STRONGLY preferred that you use docking branch with multi-viewports (== single Dear ImGui context + multiple windows) instead of multiple Dear ImGui contexts.
 static ImGui_ImplDX9_Data* ImGui_ImplDX9_GetBackendData()
 {
-    return ImGui::GetCurrentContext() ? (ImGui_ImplDX9_Data*)ImGui::GetIO().BackendRendererUserData : NULL;
+    return ImGui::GetCurrentContext() ? (ImGui_ImplDX9_Data*)ImGui::GetIO().BackendRendererUserData : nullptr;
 }
 
 // Forward Declarations
@@ -93,8 +94,8 @@ static void ImGui_ImplDX9_SetupRenderState(ImDrawData* draw_data)
     bd->pd3dDevice->SetViewport(&vp);
 
     // Setup render state: fixed-pipeline, alpha-blending, no face culling, no depth testing, shade mode (for gradient), bilinear sampling.
-    bd->pd3dDevice->SetPixelShader(NULL);
-    bd->pd3dDevice->SetVertexShader(NULL);
+    bd->pd3dDevice->SetPixelShader(nullptr);
+    bd->pd3dDevice->SetVertexShader(nullptr);
     bd->pd3dDevice->SetRenderState(D3DRS_FILLMODE, D3DFILL_SOLID);
     bd->pd3dDevice->SetRenderState(D3DRS_SHADEMODE, D3DSHADE_GOURAUD);
     bd->pd3dDevice->SetRenderState(D3DRS_ZWRITEENABLE, FALSE);
@@ -159,21 +160,21 @@ void ImGui_ImplDX9_RenderDrawData(ImDrawData* draw_data)
     ImGui_ImplDX9_Data* bd = ImGui_ImplDX9_GetBackendData();
     if (!bd->pVB || bd->VertexBufferSize < draw_data->TotalVtxCount)
     {
-        if (bd->pVB) { bd->pVB->Release(); bd->pVB = NULL; }
+        if (bd->pVB) { bd->pVB->Release(); bd->pVB = nullptr; }
         bd->VertexBufferSize = draw_data->TotalVtxCount + 5000;
-        if (bd->pd3dDevice->CreateVertexBuffer(bd->VertexBufferSize * sizeof(CUSTOMVERTEX), D3DUSAGE_DYNAMIC | D3DUSAGE_WRITEONLY, D3DFVF_CUSTOMVERTEX, D3DPOOL_DEFAULT, &bd->pVB, NULL) < 0)
+        if (bd->pd3dDevice->CreateVertexBuffer(bd->VertexBufferSize * sizeof(CUSTOMVERTEX), D3DUSAGE_DYNAMIC | D3DUSAGE_WRITEONLY, D3DFVF_CUSTOMVERTEX, D3DPOOL_DEFAULT, &bd->pVB, nullptr) < 0)
             return;
     }
     if (!bd->pIB || bd->IndexBufferSize < draw_data->TotalIdxCount)
     {
-        if (bd->pIB) { bd->pIB->Release(); bd->pIB = NULL; }
+        if (bd->pIB) { bd->pIB->Release(); bd->pIB = nullptr; }
         bd->IndexBufferSize = draw_data->TotalIdxCount + 10000;
-        if (bd->pd3dDevice->CreateIndexBuffer(bd->IndexBufferSize * sizeof(ImDrawIdx), D3DUSAGE_DYNAMIC | D3DUSAGE_WRITEONLY, sizeof(ImDrawIdx) == 2 ? D3DFMT_INDEX16 : D3DFMT_INDEX32, D3DPOOL_DEFAULT, &bd->pIB, NULL) < 0)
+        if (bd->pd3dDevice->CreateIndexBuffer(bd->IndexBufferSize * sizeof(ImDrawIdx), D3DUSAGE_DYNAMIC | D3DUSAGE_WRITEONLY, sizeof(ImDrawIdx) == 2 ? D3DFMT_INDEX16 : D3DFMT_INDEX32, D3DPOOL_DEFAULT, &bd->pIB, nullptr) < 0)
             return;
     }
 
     // Backup the DX9 state
-    IDirect3DStateBlock9* d3d9_state_block = NULL;
+    IDirect3DStateBlock9* d3d9_state_block = nullptr;
     if (bd->pd3dDevice->CreateStateBlock(D3DSBT_ALL, &d3d9_state_block) < 0)
         return;
     if (d3d9_state_block->Capture() < 0)
@@ -245,7 +246,7 @@ void ImGui_ImplDX9_RenderDrawData(ImDrawData* draw_data)
         for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
         {
             const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
-            if (pcmd->UserCallback != NULL)
+            if (pcmd->UserCallback != nullptr)
             {
                 // User callback, registered via ImDrawList::AddCallback()
                 // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
@@ -292,7 +293,7 @@ void ImGui_ImplDX9_RenderDrawData(ImDrawData* draw_data)
 bool ImGui_ImplDX9_Init(IDirect3DDevice9* device)
 {
     ImGuiIO& io = ImGui::GetIO();
-    IM_ASSERT(io.BackendRendererUserData == NULL && "Already initialized a renderer backend!");
+    IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
 
     // Setup backend capabilities flags
     ImGui_ImplDX9_Data* bd = IM_NEW(ImGui_ImplDX9_Data)();
@@ -313,14 +314,14 @@ bool ImGui_ImplDX9_Init(IDirect3DDevice9* device)
 void ImGui_ImplDX9_Shutdown()
 {
     ImGui_ImplDX9_Data* bd = ImGui_ImplDX9_GetBackendData();
-    IM_ASSERT(bd != NULL && "No renderer backend to shutdown, or already shutdown?");
+    IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?");
     ImGuiIO& io = ImGui::GetIO();
 
     ImGui_ImplDX9_ShutdownPlatformInterface();
     ImGui_ImplDX9_InvalidateDeviceObjects();
     if (bd->pd3dDevice) { bd->pd3dDevice->Release(); }
-    io.BackendRendererName = NULL;
-    io.BackendRendererUserData = NULL;
+    io.BackendRendererName = nullptr;
+    io.BackendRendererUserData = nullptr;
     IM_DELETE(bd);
 }
 
@@ -345,11 +346,11 @@ static bool ImGui_ImplDX9_CreateFontsTexture()
 #endif
 
     // Upload texture to graphics system
-    bd->FontTexture = NULL;
-    if (bd->pd3dDevice->CreateTexture(width, height, 1, D3DUSAGE_DYNAMIC, D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT, &bd->FontTexture, NULL) < 0)
+    bd->FontTexture = nullptr;
+    if (bd->pd3dDevice->CreateTexture(width, height, 1, D3DUSAGE_DYNAMIC, D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT, &bd->FontTexture, nullptr) < 0)
         return false;
     D3DLOCKED_RECT tex_locked_rect;
-    if (bd->FontTexture->LockRect(0, &tex_locked_rect, NULL, 0) != D3D_OK)
+    if (bd->FontTexture->LockRect(0, &tex_locked_rect, nullptr, 0) != D3D_OK)
         return false;
     for (int y = 0; y < height; y++)
         memcpy((unsigned char*)tex_locked_rect.pBits + (size_t)tex_locked_rect.Pitch * y, pixels + (size_t)width * bytes_per_pixel * y, (size_t)width * bytes_per_pixel);
@@ -382,16 +383,16 @@ void ImGui_ImplDX9_InvalidateDeviceObjects()
     ImGui_ImplDX9_Data* bd = ImGui_ImplDX9_GetBackendData();
     if (!bd || !bd->pd3dDevice)
         return;
-    if (bd->pVB) { bd->pVB->Release(); bd->pVB = NULL; }
-    if (bd->pIB) { bd->pIB->Release(); bd->pIB = NULL; }
-    if (bd->FontTexture) { bd->FontTexture->Release(); bd->FontTexture = NULL; ImGui::GetIO().Fonts->SetTexID(NULL); } // We copied bd->pFontTextureView to io.Fonts->TexID so let's clear that as well.
+    if (bd->pVB) { bd->pVB->Release(); bd->pVB = nullptr; }
+    if (bd->pIB) { bd->pIB->Release(); bd->pIB = nullptr; }
+    if (bd->FontTexture) { bd->FontTexture->Release(); bd->FontTexture = nullptr; ImGui::GetIO().Fonts->SetTexID(0); } // We copied bd->pFontTextureView to io.Fonts->TexID so let's clear that as well.
     ImGui_ImplDX9_InvalidateDeviceObjectsForPlatformWindows();
 }
 
 void ImGui_ImplDX9_NewFrame()
 {
     ImGui_ImplDX9_Data* bd = ImGui_ImplDX9_GetBackendData();
-    IM_ASSERT(bd != NULL && "Did you call ImGui_ImplDX9_Init()?");
+    IM_ASSERT(bd != nullptr && "Did you call ImGui_ImplDX9_Init()?");
 
     if (!bd->FontTexture)
         ImGui_ImplDX9_CreateDeviceObjects();
@@ -409,8 +410,8 @@ struct ImGui_ImplDX9_ViewportData
     IDirect3DSwapChain9*    SwapChain;
     D3DPRESENT_PARAMETERS   d3dpp;
 
-    ImGui_ImplDX9_ViewportData()  { SwapChain = NULL; ZeroMemory(&d3dpp, sizeof(D3DPRESENT_PARAMETERS)); }
-    ~ImGui_ImplDX9_ViewportData() { IM_ASSERT(SwapChain == NULL); }
+    ImGui_ImplDX9_ViewportData()  { SwapChain = nullptr; ZeroMemory(&d3dpp, sizeof(D3DPRESENT_PARAMETERS)); }
+    ~ImGui_ImplDX9_ViewportData() { IM_ASSERT(SwapChain == nullptr); }
 };
 
 static void ImGui_ImplDX9_CreateWindow(ImGuiViewport* viewport)
@@ -437,7 +438,7 @@ static void ImGui_ImplDX9_CreateWindow(ImGuiViewport* viewport)
 
     HRESULT hr = bd->pd3dDevice->CreateAdditionalSwapChain(&vd->d3dpp, &vd->SwapChain); IM_UNUSED(hr);
     IM_ASSERT(hr == D3D_OK);
-    IM_ASSERT(vd->SwapChain != NULL);
+    IM_ASSERT(vd->SwapChain != nullptr);
 }
 
 static void ImGui_ImplDX9_DestroyWindow(ImGuiViewport* viewport)
@@ -447,11 +448,11 @@ static void ImGui_ImplDX9_DestroyWindow(ImGuiViewport* viewport)
     {
         if (vd->SwapChain)
             vd->SwapChain->Release();
-        vd->SwapChain = NULL;
+        vd->SwapChain = nullptr;
         ZeroMemory(&vd->d3dpp, sizeof(D3DPRESENT_PARAMETERS));
         IM_DELETE(vd);
     }
-    viewport->RendererUserData = NULL;
+    viewport->RendererUserData = nullptr;
 }
 
 static void ImGui_ImplDX9_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
@@ -461,7 +462,7 @@ static void ImGui_ImplDX9_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
     if (vd->SwapChain)
     {
         vd->SwapChain->Release();
-        vd->SwapChain = NULL;
+        vd->SwapChain = nullptr;
         vd->d3dpp.BackBufferWidth = (UINT)size.x;
         vd->d3dpp.BackBufferHeight = (UINT)size.y;
         HRESULT hr = bd->pd3dDevice->CreateAdditionalSwapChain(&vd->d3dpp, &vd->SwapChain); IM_UNUSED(hr);
@@ -475,19 +476,19 @@ static void ImGui_ImplDX9_RenderWindow(ImGuiViewport* viewport, void*)
     ImGui_ImplDX9_ViewportData* vd = (ImGui_ImplDX9_ViewportData*)viewport->RendererUserData;
     ImVec4 clear_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f);
 
-    LPDIRECT3DSURFACE9 render_target = NULL;
-    LPDIRECT3DSURFACE9 last_render_target = NULL;
-    LPDIRECT3DSURFACE9 last_depth_stencil = NULL;
+    LPDIRECT3DSURFACE9 render_target = nullptr;
+    LPDIRECT3DSURFACE9 last_render_target = nullptr;
+    LPDIRECT3DSURFACE9 last_depth_stencil = nullptr;
     vd->SwapChain->GetBackBuffer(0, D3DBACKBUFFER_TYPE_MONO, &render_target);
     bd->pd3dDevice->GetRenderTarget(0, &last_render_target);
     bd->pd3dDevice->GetDepthStencilSurface(&last_depth_stencil);
     bd->pd3dDevice->SetRenderTarget(0, render_target);
-    bd->pd3dDevice->SetDepthStencilSurface(NULL);
+    bd->pd3dDevice->SetDepthStencilSurface(nullptr);
 
     if (!(viewport->Flags & ImGuiViewportFlags_NoRendererClear))
     {
         D3DCOLOR clear_col_dx = D3DCOLOR_RGBA((int)(clear_color.x*255.0f), (int)(clear_color.y*255.0f), (int)(clear_color.z*255.0f), (int)(clear_color.w*255.0f));
-        bd->pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET, clear_col_dx, 1.0f, 0);
+        bd->pd3dDevice->Clear(0, nullptr, D3DCLEAR_TARGET, clear_col_dx, 1.0f, 0);
     }
 
     ImGui_ImplDX9_RenderDrawData(viewport->DrawData);
@@ -503,7 +504,7 @@ static void ImGui_ImplDX9_RenderWindow(ImGuiViewport* viewport, void*)
 static void ImGui_ImplDX9_SwapBuffers(ImGuiViewport* viewport, void*)
 {
     ImGui_ImplDX9_ViewportData* vd = (ImGui_ImplDX9_ViewportData*)viewport->RendererUserData;
-    HRESULT hr = vd->SwapChain->Present(NULL, NULL, vd->d3dpp.hDeviceWindow, NULL, 0);
+    HRESULT hr = vd->SwapChain->Present(nullptr, nullptr, vd->d3dpp.hDeviceWindow, nullptr, 0);
     // Let main application handle D3DERR_DEVICELOST by resetting the device.
     IM_ASSERT(hr == D3D_OK || hr == D3DERR_DEVICELOST);
 }

backends/imgui_impl_glfw.cpp

@@ -21,6 +21,7 @@
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
 //  2022-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2022-10-11: Using 'nullptr' instead of 'NULL' as per our switch to C++11.
 //  2022-09-26: Inputs: Renamed ImGuiKey_ModXXX introduced in 1.87 to ImGuiMod_XXX (old names still supported).
 //  2022-09-01: Inputs: Honor GLFW_CURSOR_DISABLED by not setting mouse position.
 //  2022-04-30: Inputs: Fixed ImGui_ImplGlfw_TranslateUntranslatedKey() for lower case letters on OSX.
@@ -66,9 +67,6 @@
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wold-style-cast"     // warning: use of old-style cast
 #pragma clang diagnostic ignored "-Wsign-conversion"    // warning: implicit conversion changes signedness
-#if __has_warning("-Wzero-as-null-pointer-constant")
-#pragma clang diagnostic ignored "-Wzero-as-null-pointer-constant"
-#endif
 #endif
 
 // GLFW
@@ -151,7 +149,7 @@ struct ImGui_ImplGlfw_Data
 // FIXME: some shared resources (mouse cursor shape, gamepad) are mishandled when using multi-context.
 static ImGui_ImplGlfw_Data* ImGui_ImplGlfw_GetBackendData()
 {
-    return ImGui::GetCurrentContext() ? (ImGui_ImplGlfw_Data*)ImGui::GetIO().BackendPlatformUserData : NULL;
+    return ImGui::GetCurrentContext() ? (ImGui_ImplGlfw_Data*)ImGui::GetIO().BackendPlatformUserData : nullptr;
 }
 
 // Forward Declarations
@@ -308,7 +306,7 @@ static void ImGui_ImplGlfw_UpdateKeyModifiers(int mods)
 void ImGui_ImplGlfw_MouseButtonCallback(GLFWwindow* window, int button, int action, int mods)
 {
     ImGui_ImplGlfw_Data* bd = ImGui_ImplGlfw_GetBackendData();
-    if (bd->PrevUserCallbackMousebutton != NULL && window == bd->Window)
+    if (bd->PrevUserCallbackMousebutton != nullptr && window == bd->Window)
         bd->PrevUserCallbackMousebutton(window, button, action, mods);
 
     ImGui_ImplGlfw_UpdateKeyModifiers(mods);
@@ -321,7 +319,7 @@ void ImGui_ImplGlfw_MouseButtonCallback(GLFWwindow* window, int button, int acti
 void ImGui_ImplGlfw_ScrollCallback(GLFWwindow* window, double xoffset, double yoffset)
 {
     ImGui_ImplGlfw_Data* bd = ImGui_ImplGlfw_GetBackendData();
-    if (bd->PrevUserCallbackScroll != NULL && window == bd->Window)
+    if (bd->PrevUserCallbackScroll != nullptr && window == bd->Window)
         bd->PrevUserCallbackScroll(window, xoffset, yoffset);
 
     ImGuiIO& io = ImGui::GetIO();
@@ -359,7 +357,7 @@ static int ImGui_ImplGlfw_TranslateUntranslatedKey(int key, int scancode)
 void ImGui_ImplGlfw_KeyCallback(GLFWwindow* window, int keycode, int scancode, int action, int mods)
 {
     ImGui_ImplGlfw_Data* bd = ImGui_ImplGlfw_GetBackendData();
-    if (bd->PrevUserCallbackKey != NULL && window == bd->Window)
+    if (bd->PrevUserCallbackKey != nullptr && window == bd->Window)
         bd->PrevUserCallbackKey(window, keycode, scancode, action, mods);
 
     if (action != GLFW_PRESS && action != GLFW_RELEASE)
@@ -371,7 +369,7 @@ void ImGui_ImplGlfw_KeyCallback(GLFWwindow* window, int keycode, int scancode, i
     ImGui_ImplGlfw_UpdateKeyModifiers(mods);
 
     if (keycode >= 0 && keycode < IM_ARRAYSIZE(bd->KeyOwnerWindows))
-        bd->KeyOwnerWindows[keycode] = (action == GLFW_PRESS) ? window : NULL;
+        bd->KeyOwnerWindows[keycode] = (action == GLFW_PRESS) ? window : nullptr;
 
     keycode = ImGui_ImplGlfw_TranslateUntranslatedKey(keycode, scancode);
 
@@ -384,7 +382,7 @@ void ImGui_ImplGlfw_KeyCallback(GLFWwindow* window, int keycode, int scancode, i
 void ImGui_ImplGlfw_WindowFocusCallback(GLFWwindow* window, int focused)
 {
     ImGui_ImplGlfw_Data* bd = ImGui_ImplGlfw_GetBackendData();
-    if (bd->PrevUserCallbackWindowFocus != NULL && window == bd->Window)
+    if (bd->PrevUserCallbackWindowFocus != nullptr && window == bd->Window)
         bd->PrevUserCallbackWindowFocus(window, focused);
 
     ImGuiIO& io = ImGui::GetIO();
@@ -394,7 +392,7 @@ void ImGui_ImplGlfw_WindowFocusCallback(GLFWwindow* window, int focused)
 void ImGui_ImplGlfw_CursorPosCallback(GLFWwindow* window, double x, double y)
 {
     ImGui_ImplGlfw_Data* bd = ImGui_ImplGlfw_GetBackendData();
-    if (bd->PrevUserCallbackCursorPos != NULL && window == bd->Window)
+    if (bd->PrevUserCallbackCursorPos != nullptr && window == bd->Window)
         bd->PrevUserCallbackCursorPos(window, x, y);
     if (glfwGetInputMode(window, GLFW_CURSOR) == GLFW_CURSOR_DISABLED)
         return;
@@ -416,7 +414,7 @@ void ImGui_ImplGlfw_CursorPosCallback(GLFWwindow* window, double x, double y)
 void ImGui_ImplGlfw_CursorEnterCallback(GLFWwindow* window, int entered)
 {
     ImGui_ImplGlfw_Data* bd = ImGui_ImplGlfw_GetBackendData();
-    if (bd->PrevUserCallbackCursorEnter != NULL && window == bd->Window)
+    if (bd->PrevUserCallbackCursorEnter != nullptr && window == bd->Window)
         bd->PrevUserCallbackCursorEnter(window, entered);
     if (glfwGetInputMode(window, GLFW_CURSOR) == GLFW_CURSOR_DISABLED)
         return;
@@ -430,7 +428,7 @@ void ImGui_ImplGlfw_CursorEnterCallback(GLFWwindow* window, int entered)
     else if (!entered && bd->MouseWindow == window)
     {
         bd->LastValidMousePos = io.MousePos;
-        bd->MouseWindow = NULL;
+        bd->MouseWindow = nullptr;
         io.AddMousePosEvent(-FLT_MAX, -FLT_MAX);
     }
 }
@@ -438,7 +436,7 @@ void ImGui_ImplGlfw_CursorEnterCallback(GLFWwindow* window, int entered)
 void ImGui_ImplGlfw_CharCallback(GLFWwindow* window, unsigned int c)
 {
     ImGui_ImplGlfw_Data* bd = ImGui_ImplGlfw_GetBackendData();
-    if (bd->PrevUserCallbackChar != NULL && window == bd->Window)
+    if (bd->PrevUserCallbackChar != nullptr && window == bd->Window)
         bd->PrevUserCallbackChar(window, c);
 
     ImGuiIO& io = ImGui::GetIO();
@@ -483,20 +481,20 @@ void ImGui_ImplGlfw_RestoreCallbacks(GLFWwindow* window)
     glfwSetCharCallback(window, bd->PrevUserCallbackChar);
     glfwSetMonitorCallback(bd->PrevUserCallbackMonitor);
     bd->InstalledCallbacks = false;
-    bd->PrevUserCallbackWindowFocus = NULL;
-    bd->PrevUserCallbackCursorEnter = NULL;
-    bd->PrevUserCallbackCursorPos = NULL;
-    bd->PrevUserCallbackMousebutton = NULL;
-    bd->PrevUserCallbackScroll = NULL;
-    bd->PrevUserCallbackKey = NULL;
-    bd->PrevUserCallbackChar = NULL;
-    bd->PrevUserCallbackMonitor = NULL;
+    bd->PrevUserCallbackWindowFocus = nullptr;
+    bd->PrevUserCallbackCursorEnter = nullptr;
+    bd->PrevUserCallbackCursorPos = nullptr;
+    bd->PrevUserCallbackMousebutton = nullptr;
+    bd->PrevUserCallbackScroll = nullptr;
+    bd->PrevUserCallbackKey = nullptr;
+    bd->PrevUserCallbackChar = nullptr;
+    bd->PrevUserCallbackMonitor = nullptr;
 }
 
 static bool ImGui_ImplGlfw_Init(GLFWwindow* window, bool install_callbacks, GlfwClientApi client_api)
 {
     ImGuiIO& io = ImGui::GetIO();
-    IM_ASSERT(io.BackendPlatformUserData == NULL && "Already initialized a platform backend!");
+    IM_ASSERT(io.BackendPlatformUserData == nullptr && "Already initialized a platform backend!");
 
     // Setup backend capabilities flags
     ImGui_ImplGlfw_Data* bd = IM_NEW(ImGui_ImplGlfw_Data)();
@@ -520,8 +518,8 @@ static bool ImGui_ImplGlfw_Init(GLFWwindow* window, bool install_callbacks, Glfw
     // Create mouse cursors
     // (By design, on X11 cursors are user configurable and some cursors may be missing. When a cursor doesn't exist,
     // GLFW will emit an error which will often be printed by the app, so we temporarily disable error reporting.
-    // Missing cursors will return NULL and our _UpdateMouseCursor() function will use the Arrow cursor instead.)
-    GLFWerrorfun prev_error_callback = glfwSetErrorCallback(NULL);
+    // Missing cursors will return nullptr and our _UpdateMouseCursor() function will use the Arrow cursor instead.)
+    GLFWerrorfun prev_error_callback = glfwSetErrorCallback(nullptr);
     bd->MouseCursors[ImGuiMouseCursor_Arrow] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
     bd->MouseCursors[ImGuiMouseCursor_TextInput] = glfwCreateStandardCursor(GLFW_IBEAM_CURSOR);
     bd->MouseCursors[ImGuiMouseCursor_ResizeNS] = glfwCreateStandardCursor(GLFW_VRESIZE_CURSOR);
@@ -581,7 +579,7 @@ bool ImGui_ImplGlfw_InitForOther(GLFWwindow* window, bool install_callbacks)
 void ImGui_ImplGlfw_Shutdown()
 {
     ImGui_ImplGlfw_Data* bd = ImGui_ImplGlfw_GetBackendData();
-    IM_ASSERT(bd != NULL && "No platform backend to shutdown, or already shutdown?");
+    IM_ASSERT(bd != nullptr && "No platform backend to shutdown, or already shutdown?");
     ImGuiIO& io = ImGui::GetIO();
 
     ImGui_ImplGlfw_ShutdownPlatformInterface();
@@ -592,8 +590,8 @@ void ImGui_ImplGlfw_Shutdown()
     for (ImGuiMouseCursor cursor_n = 0; cursor_n < ImGuiMouseCursor_COUNT; cursor_n++)
         glfwDestroyCursor(bd->MouseCursors[cursor_n]);
 
-    io.BackendPlatformName = NULL;
-    io.BackendPlatformUserData = NULL;
+    io.BackendPlatformName = nullptr;
+    io.BackendPlatformUserData = nullptr;
     IM_DELETE(bd);
 }
 
@@ -629,7 +627,7 @@ static void ImGui_ImplGlfw_UpdateMouseData()
                 glfwSetCursorPos(window, (double)(mouse_pos_prev.x - viewport->Pos.x), (double)(mouse_pos_prev.y - viewport->Pos.y));
 
             // (Optional) Fallback to provide mouse position when focused (ImGui_ImplGlfw_CursorPosCallback already provides this when hovered or captured)
-            if (bd->MouseWindow == NULL)
+            if (bd->MouseWindow == nullptr)
             {
                 double mouse_x, mouse_y;
                 glfwGetCursorPos(window, &mouse_x, &mouse_y);
@@ -792,7 +790,7 @@ void ImGui_ImplGlfw_NewFrame()
 {
     ImGuiIO& io = ImGui::GetIO();
     ImGui_ImplGlfw_Data* bd = ImGui_ImplGlfw_GetBackendData();
-    IM_ASSERT(bd != NULL && "Did you call ImGui_ImplGlfw_InitForXXX()?");
+    IM_ASSERT(bd != nullptr && "Did you call ImGui_ImplGlfw_InitForXXX()?");
 
     // Setup display size (every frame to accommodate for window resizing)
     int w, h;
@@ -831,8 +829,8 @@ struct ImGui_ImplGlfw_ViewportData
     int         IgnoreWindowPosEventFrame;
     int         IgnoreWindowSizeEventFrame;
 
-    ImGui_ImplGlfw_ViewportData()  { Window = NULL; WindowOwned = false; IgnoreWindowSizeEventFrame = IgnoreWindowPosEventFrame = -1; }
-    ~ImGui_ImplGlfw_ViewportData() { IM_ASSERT(Window == NULL); }
+    ImGui_ImplGlfw_ViewportData()  { Window = nullptr; WindowOwned = false; IgnoreWindowSizeEventFrame = IgnoreWindowPosEventFrame = -1; }
+    ~ImGui_ImplGlfw_ViewportData() { IM_ASSERT(Window == nullptr); }
 };
 
 static void ImGui_ImplGlfw_WindowCloseCallback(GLFWwindow* window)
@@ -894,8 +892,8 @@ static void ImGui_ImplGlfw_CreateWindow(ImGuiViewport* viewport)
 #if GLFW_HAS_WINDOW_TOPMOST
     glfwWindowHint(GLFW_FLOATING, (viewport->Flags & ImGuiViewportFlags_TopMost) ? true : false);
 #endif
-    GLFWwindow* share_window = (bd->ClientApi == GlfwClientApi_OpenGL) ? bd->Window : NULL;
-    vd->Window = glfwCreateWindow((int)viewport->Size.x, (int)viewport->Size.y, "No Title Yet", NULL, share_window);
+    GLFWwindow* share_window = (bd->ClientApi == GlfwClientApi_OpenGL) ? bd->Window : nullptr;
+    vd->Window = glfwCreateWindow((int)viewport->Size.x, (int)viewport->Size.y, "No Title Yet", nullptr, share_window);
     vd->WindowOwned = true;
     viewport->PlatformHandle = (void*)vd->Window;
 #ifdef _WIN32
@@ -943,10 +941,10 @@ static void ImGui_ImplGlfw_DestroyWindow(ImGuiViewport* viewport)
 
             glfwDestroyWindow(vd->Window);
         }
-        vd->Window = NULL;
+        vd->Window = nullptr;
         IM_DELETE(vd);
     }
-    viewport->PlatformUserData = viewport->PlatformHandle = NULL;
+    viewport->PlatformUserData = viewport->PlatformHandle = nullptr;
 }
 
 // We have submitted https://github.com/glfw/glfw/pull/1568 to allow GLFW to support "transparent inputs".
@@ -988,7 +986,7 @@ static void ImGui_ImplGlfw_ShowWindow(ImGuiViewport* viewport)
 #if !GLFW_HAS_MOUSE_PASSTHROUGH && GLFW_HAS_WINDOW_HOVERED && defined(_WIN32)
     ImGui_ImplGlfw_Data* bd = ImGui_ImplGlfw_GetBackendData();
     ::SetPropA(hwnd, "IMGUI_VIEWPORT", viewport);
-    if (bd->GlfwWndProc == NULL)
+    if (bd->GlfwWndProc == nullptr)
         bd->GlfwWndProc = (WNDPROC)::GetWindowLongPtr(hwnd, GWLP_WNDPROC);
     ::SetWindowLongPtr(hwnd, GWLP_WNDPROC, (LONG_PTR)WndProcNoInputs);
 #endif

backends/imgui_impl_glfw.h

@@ -18,10 +18,6 @@
 // If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
 // Read online: https://github.com/ocornut/imgui/tree/master/docs
 
-// About GLSL version:
-// The 'glsl_version' initialization parameter defaults to "#version 150" if NULL.
-// Only override if your GL version doesn't handle this GLSL version. Keep NULL if unsure!
-
 #pragma once
 #include "imgui.h"      // IMGUI_IMPL_API
 

backends/imgui_impl_metal.mm

@@ -84,7 +84,7 @@ struct ImGui_ImplMetal_Data
 };
 
 static ImGui_ImplMetal_Data*    ImGui_ImplMetal_CreateBackendData() { return IM_NEW(ImGui_ImplMetal_Data)(); }
-static ImGui_ImplMetal_Data*    ImGui_ImplMetal_GetBackendData()    { return ImGui::GetCurrentContext() ? (ImGui_ImplMetal_Data*)ImGui::GetIO().BackendRendererUserData : NULL; }
+static ImGui_ImplMetal_Data*    ImGui_ImplMetal_GetBackendData()    { return ImGui::GetCurrentContext() ? (ImGui_ImplMetal_Data*)ImGui::GetIO().BackendRendererUserData : nullptr; }
 static void                     ImGui_ImplMetal_DestroyBackendData(){ IM_DELETE(ImGui_ImplMetal_GetBackendData()); }
 
 static inline CFTimeInterval    GetMachAbsoluteTimeInSeconds()      { return (CFTimeInterval)(double)(clock_gettime_nsec_np(CLOCK_UPTIME_RAW) / 1e9); }
@@ -310,7 +310,7 @@ void ImGui_ImplMetal_RenderDrawData(ImDrawData* drawData, id<MTLCommandBuffer> c
     {
         dispatch_async(dispatch_get_main_queue(), ^{
             ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData();
-            if (bd != NULL)
+            if (bd != nullptr)
             {
                 @synchronized(bd->SharedMetalContext.bufferCache)
                 {
@@ -400,7 +400,7 @@ struct ImGuiViewportDataMetal
     CAMetalLayer*               MetalLayer;
     id<MTLCommandQueue>         CommandQueue;
     MTLRenderPassDescriptor*    RenderPassDescriptor;
-    void*                       Handle = NULL;
+    void*                       Handle = nullptr;
     bool                        FirstFrame = true;
 };
 
@@ -413,7 +413,7 @@ static void ImGui_ImplMetal_CreateWindow(ImGuiViewport* viewport)
     // PlatformHandleRaw should always be a NSWindow*, whereas PlatformHandle might be a higher-level handle (e.g. GLFWWindow*, SDL_Window*).
     // Some back-ends will leave PlatformHandleRaw NULL, in which case we assume PlatformHandle will contain the NSWindow*.
     void* handle = viewport->PlatformHandleRaw ? viewport->PlatformHandleRaw : viewport->PlatformHandle;
-    IM_ASSERT(handle != NULL);
+    IM_ASSERT(handle != nullptr);
 
     id<MTLDevice> device = [bd->SharedMetalContext.depthStencilState device];
     CAMetalLayer* layer = [CAMetalLayer layer];
@@ -437,7 +437,7 @@ static void ImGui_ImplMetal_DestroyWindow(ImGuiViewport* viewport)
     // The main viewport (owned by the application) will always have RendererUserData == NULL since we didn't create the data for it.
     if (ImGuiViewportDataMetal* data = (ImGuiViewportDataMetal*)viewport->RendererUserData)
         IM_DELETE(data);
-    viewport->RendererUserData = NULL;
+    viewport->RendererUserData = nullptr;
 }
 
 inline static CGSize MakeScaledSize(CGSize size, CGFloat scale)

backends/imgui_impl_opengl2.cpp

@@ -21,6 +21,7 @@
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
 //  2022-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2022-10-11: Using 'nullptr' instead of 'NULL' as per our switch to C++11.
 //  2021-12-08: OpenGL: Fixed mishandling of the the ImDrawCmd::IdxOffset field! This is an old bug but it never had an effect until some internal rendering changes in 1.86.
 //  2021-06-29: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX).
 //  2021-05-19: OpenGL: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement)
@@ -70,7 +71,7 @@ struct ImGui_ImplOpenGL2_Data
 // It is STRONGLY preferred that you use docking branch with multi-viewports (== single Dear ImGui context + multiple windows) instead of multiple Dear ImGui contexts.
 static ImGui_ImplOpenGL2_Data* ImGui_ImplOpenGL2_GetBackendData()
 {
-    return ImGui::GetCurrentContext() ? (ImGui_ImplOpenGL2_Data*)ImGui::GetIO().BackendRendererUserData : NULL;
+    return ImGui::GetCurrentContext() ? (ImGui_ImplOpenGL2_Data*)ImGui::GetIO().BackendRendererUserData : nullptr;
 }
 
 // Forward Declarations
@@ -81,7 +82,7 @@ static void ImGui_ImplOpenGL2_ShutdownPlatformInterface();
 bool    ImGui_ImplOpenGL2_Init()
 {
     ImGuiIO& io = ImGui::GetIO();
-    IM_ASSERT(io.BackendRendererUserData == NULL && "Already initialized a renderer backend!");
+    IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
 
     // Setup backend capabilities flags
     ImGui_ImplOpenGL2_Data* bd = IM_NEW(ImGui_ImplOpenGL2_Data)();
@@ -98,20 +99,20 @@ bool    ImGui_ImplOpenGL2_Init()
 void    ImGui_ImplOpenGL2_Shutdown()
 {
     ImGui_ImplOpenGL2_Data* bd = ImGui_ImplOpenGL2_GetBackendData();
-    IM_ASSERT(bd != NULL && "No renderer backend to shutdown, or already shutdown?");
+    IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?");
     ImGuiIO& io = ImGui::GetIO();
 
     ImGui_ImplOpenGL2_ShutdownPlatformInterface();
     ImGui_ImplOpenGL2_DestroyDeviceObjects();
-    io.BackendRendererName = NULL;
-    io.BackendRendererUserData = NULL;
+    io.BackendRendererName = nullptr;
+    io.BackendRendererUserData = nullptr;
     IM_DELETE(bd);
 }
 
 void    ImGui_ImplOpenGL2_NewFrame()
 {
     ImGui_ImplOpenGL2_Data* bd = ImGui_ImplOpenGL2_GetBackendData();
-    IM_ASSERT(bd != NULL && "Did you call ImGui_ImplOpenGL2_Init()?");
+    IM_ASSERT(bd != nullptr && "Did you call ImGui_ImplOpenGL2_Init()?");
 
     if (!bd->FontTexture)
         ImGui_ImplOpenGL2_CreateDeviceObjects();
@@ -219,7 +220,7 @@ void ImGui_ImplOpenGL2_RenderDrawData(ImDrawData* draw_data)
                     continue;
 
                 // Apply scissor/clipping rectangle (Y is inverted in OpenGL)
-                glScissor((int)clip_min.x, (int)(fb_height - clip_max.y), (int)(clip_max.x - clip_min.x), (int)(clip_max.y - clip_min.y));
+                glScissor((int)clip_min.x, (int)((float)fb_height - clip_max.y), (int)(clip_max.x - clip_min.x), (int)(clip_max.y - clip_min.y));
 
                 // Bind texture, Draw
                 glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->GetTexID());

backends/imgui_impl_opengl3.cpp

@@ -16,6 +16,7 @@
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
 //  2022-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2022-10-11: Using 'nullptr' instead of 'NULL' as per our switch to C++11.
 //  2022-09-27: OpenGL: Added ability to '#define IMGUI_IMPL_OPENGL_DEBUG'.
 //  2022-05-23: OpenGL: Reworking 2021-12-15 "Using buffer orphaning" so it only happens on Intel GPU, seems to cause problems otherwise. (#4468, #4825, #4832, #5127).
 //  2022-05-13: OpenGL: Fix state corruption on OpenGL ES 2.0 due to not preserving GL_ELEMENT_ARRAY_BUFFER_BINDING and vertex attribute states.
@@ -59,7 +60,7 @@
 //  2018-06-08: Misc: Extracted imgui_impl_opengl3.cpp/.h away from the old combined GLFW/SDL+OpenGL3 examples.
 //  2018-06-08: OpenGL: Use draw_data->DisplayPos and draw_data->DisplaySize to setup projection matrix and clipping rectangle.
 //  2018-05-25: OpenGL: Removed unnecessary backup/restore of GL_ELEMENT_ARRAY_BUFFER_BINDING since this is part of the VAO state.
-//  2018-05-14: OpenGL: Making the call to glBindSampler() optional so 3.2 context won't fail if the function is a NULL pointer.
+//  2018-05-14: OpenGL: Making the call to glBindSampler() optional so 3.2 context won't fail if the function is a nullptr pointer.
 //  2018-03-06: OpenGL: Added const char* glsl_version parameter to ImGui_ImplOpenGL3_Init() so user can override the GLSL version e.g. "#version 150".
 //  2018-02-23: OpenGL: Create the VAO in the render function so the setup can more easily be used with multiple shared GL context.
 //  2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplSdlGL3_RenderDrawData() in the .h file so you can call it yourself.
@@ -109,9 +110,6 @@
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wold-style-cast"     // warning: use of old-style cast
 #pragma clang diagnostic ignored "-Wsign-conversion"    // warning: implicit conversion changes signedness
-#if __has_warning("-Wzero-as-null-pointer-constant")
-#pragma clang diagnostic ignored "-Wzero-as-null-pointer-constant"
-#endif
 #endif
 
 // GL includes
@@ -215,7 +213,7 @@ struct ImGui_ImplOpenGL3_Data
 // It is STRONGLY preferred that you use docking branch with multi-viewports (== single Dear ImGui context + multiple windows) instead of multiple Dear ImGui contexts.
 static ImGui_ImplOpenGL3_Data* ImGui_ImplOpenGL3_GetBackendData()
 {
-    return ImGui::GetCurrentContext() ? (ImGui_ImplOpenGL3_Data*)ImGui::GetIO().BackendRendererUserData : NULL;
+    return ImGui::GetCurrentContext() ? (ImGui_ImplOpenGL3_Data*)ImGui::GetIO().BackendRendererUserData : nullptr;
 }
 
 // Forward Declarations
@@ -250,7 +248,7 @@ struct ImGui_ImplOpenGL3_VtxAttribState
 bool    ImGui_ImplOpenGL3_Init(const char* glsl_version)
 {
     ImGuiIO& io = ImGui::GetIO();
-    IM_ASSERT(io.BackendRendererUserData == NULL && "Already initialized a renderer backend!");
+    IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
 
     // Initialize our loader
 #if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3) && !defined(IMGUI_IMPL_OPENGL_LOADER_CUSTOM)
@@ -301,8 +299,8 @@ bool    ImGui_ImplOpenGL3_Init(const char* glsl_version)
     io.BackendFlags |= ImGuiBackendFlags_RendererHasViewports;  // We can create multi-viewports on the Renderer side (optional)
 
     // Store GLSL version string so we can refer to it later in case we recreate shaders.
-    // Note: GLSL version is NOT the same as GL version. Leave this to NULL if unsure.
-    if (glsl_version == NULL)
+    // Note: GLSL version is NOT the same as GL version. Leave this to nullptr if unsure.
+    if (glsl_version == nullptr)
     {
 #if defined(IMGUI_IMPL_OPENGL_ES2)
         glsl_version = "#version 100";
@@ -331,7 +329,7 @@ bool    ImGui_ImplOpenGL3_Init(const char* glsl_version)
     for (GLint i = 0; i < num_extensions; i++)
     {
         const char* extension = (const char*)glGetStringi(GL_EXTENSIONS, i);
-        if (extension != NULL && strcmp(extension, "GL_ARB_clip_control") == 0)
+        if (extension != nullptr && strcmp(extension, "GL_ARB_clip_control") == 0)
             bd->HasClipOrigin = true;
     }
 #endif
@@ -345,20 +343,20 @@ bool    ImGui_ImplOpenGL3_Init(const char* glsl_version)
 void    ImGui_ImplOpenGL3_Shutdown()
 {
     ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
-    IM_ASSERT(bd != NULL && "No renderer backend to shutdown, or already shutdown?");
+    IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?");
     ImGuiIO& io = ImGui::GetIO();
 
     ImGui_ImplOpenGL3_ShutdownPlatformInterface();
     ImGui_ImplOpenGL3_DestroyDeviceObjects();
-    io.BackendRendererName = NULL;
-    io.BackendRendererUserData = NULL;
+    io.BackendRendererName = nullptr;
+    io.BackendRendererUserData = nullptr;
     IM_DELETE(bd);
 }
 
 void    ImGui_ImplOpenGL3_NewFrame()
 {
     ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
-    IM_ASSERT(bd != NULL && "Did you call ImGui_ImplOpenGL3_Init()?");
+    IM_ASSERT(bd != nullptr && "Did you call ImGui_ImplOpenGL3_Init()?");
 
     if (!bd->ShaderHandle)
         ImGui_ImplOpenGL3_CreateDeviceObjects();
@@ -518,12 +516,12 @@ void    ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data)
             if (bd->VertexBufferSize < vtx_buffer_size)
             {
                 bd->VertexBufferSize = vtx_buffer_size;
-                GL_CALL(glBufferData(GL_ARRAY_BUFFER, bd->VertexBufferSize, NULL, GL_STREAM_DRAW));
+                GL_CALL(glBufferData(GL_ARRAY_BUFFER, bd->VertexBufferSize, nullptr, GL_STREAM_DRAW));
             }
             if (bd->IndexBufferSize < idx_buffer_size)
             {
                 bd->IndexBufferSize = idx_buffer_size;
-                GL_CALL(glBufferData(GL_ELEMENT_ARRAY_BUFFER, bd->IndexBufferSize, NULL, GL_STREAM_DRAW));
+                GL_CALL(glBufferData(GL_ELEMENT_ARRAY_BUFFER, bd->IndexBufferSize, nullptr, GL_STREAM_DRAW));
             }
             GL_CALL(glBufferSubData(GL_ARRAY_BUFFER, 0, vtx_buffer_size, (const GLvoid*)cmd_list->VtxBuffer.Data));
             GL_CALL(glBufferSubData(GL_ELEMENT_ARRAY_BUFFER, 0, idx_buffer_size, (const GLvoid*)cmd_list->IdxBuffer.Data));
@@ -537,7 +535,7 @@ void    ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data)
         for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
         {
             const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
-            if (pcmd->UserCallback != NULL)
+            if (pcmd->UserCallback != nullptr)
             {
                 // User callback, registered via ImDrawList::AddCallback()
                 // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
@@ -668,7 +666,7 @@ static bool CheckShader(GLuint handle, const char* desc)
     {
         ImVector<char> buf;
         buf.resize((int)(log_length + 1));
-        glGetShaderInfoLog(handle, log_length, NULL, (GLchar*)buf.begin());
+        glGetShaderInfoLog(handle, log_length, nullptr, (GLchar*)buf.begin());
         fprintf(stderr, "%s\n", buf.begin());
     }
     return (GLboolean)status == GL_TRUE;
@@ -687,7 +685,7 @@ static bool CheckProgram(GLuint handle, const char* desc)
     {
         ImVector<char> buf;
         buf.resize((int)(log_length + 1));
-        glGetProgramInfoLog(handle, log_length, NULL, (GLchar*)buf.begin());
+        glGetProgramInfoLog(handle, log_length, nullptr, (GLchar*)buf.begin());
         fprintf(stderr, "%s\n", buf.begin());
     }
     return (GLboolean)status == GL_TRUE;
@@ -811,8 +809,8 @@ bool    ImGui_ImplOpenGL3_CreateDeviceObjects()
         "}\n";
 
     // Select shaders matching our GLSL versions
-    const GLchar* vertex_shader = NULL;
-    const GLchar* fragment_shader = NULL;
+    const GLchar* vertex_shader = nullptr;
+    const GLchar* fragment_shader = nullptr;
     if (glsl_version < 130)
     {
         vertex_shader = vertex_shader_glsl_120;
@@ -837,13 +835,13 @@ bool    ImGui_ImplOpenGL3_CreateDeviceObjects()
     // Create shaders
     const GLchar* vertex_shader_with_version[2] = { bd->GlslVersionString, vertex_shader };
     GLuint vert_handle = glCreateShader(GL_VERTEX_SHADER);
-    glShaderSource(vert_handle, 2, vertex_shader_with_version, NULL);
+    glShaderSource(vert_handle, 2, vertex_shader_with_version, nullptr);
     glCompileShader(vert_handle);
     CheckShader(vert_handle, "vertex shader");
 
     const GLchar* fragment_shader_with_version[2] = { bd->GlslVersionString, fragment_shader };
     GLuint frag_handle = glCreateShader(GL_FRAGMENT_SHADER);
-    glShaderSource(frag_handle, 2, fragment_shader_with_version, NULL);
+    glShaderSource(frag_handle, 2, fragment_shader_with_version, nullptr);
     glCompileShader(frag_handle);
     CheckShader(frag_handle, "fragment shader");
 

backends/imgui_impl_opengl3.h

@@ -14,7 +14,7 @@
 // Read online: https://github.com/ocornut/imgui/tree/master/docs
 
 // About GLSL version:
-//  The 'glsl_version' initialization parameter should be NULL (default) or a "#version XXX" string.
+//  The 'glsl_version' initialization parameter should be nullptr (default) or a "#version XXX" string.
 //  On computer platform the GLSL version default to "#version 130". On OpenGL ES 3 platform it defaults to "#version 300 es"
 //  Only override if your GL version doesn't handle this GLSL version. See GLSL version table at the top of imgui_impl_opengl3.cpp.
 
@@ -22,7 +22,7 @@
 #include "imgui.h"      // IMGUI_IMPL_API
 
 // Backend API
-IMGUI_IMPL_API bool     ImGui_ImplOpenGL3_Init(const char* glsl_version = NULL);
+IMGUI_IMPL_API bool     ImGui_ImplOpenGL3_Init(const char* glsl_version = nullptr);
 IMGUI_IMPL_API void     ImGui_ImplOpenGL3_Shutdown();
 IMGUI_IMPL_API void     ImGui_ImplOpenGL3_NewFrame();
 IMGUI_IMPL_API void     ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data);

backends/imgui_impl_osx.mm

@@ -25,12 +25,13 @@
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
 //  2022-XX-XX: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2022-10-06: Fixed mouse inputs on flipped views.
 //  2022-09-26: Inputs: Renamed ImGuiKey_ModXXX introduced in 1.87 to ImGuiMod_XXX (old names still supported).
 //  2022-05-03: Inputs: Removed ImGui_ImplOSX_HandleEvent() from backend API in favor of backend automatically handling event capture.
 //  2022-04-27: Misc: Store backend data in a per-context struct, allowing to use this backend with multiple contexts.
 //  2022-03-22: Inputs: Monitor NSKeyUp events to catch missing keyUp for key when user press Cmd + key
 //  2022-02-07: Inputs: Forward keyDown/keyUp events to OS when unused by dear imgui.
-//  2022-01-31: Fix building with old Xcode versions that are missing gamepad features.
+//  2022-01-31: Fixed building with old Xcode versions that are missing gamepad features.
 //  2022-01-26: Inputs: replaced short-lived io.AddKeyModsEvent() (added two weeks ago) with io.AddKeyEvent() using ImGuiKey_ModXXX flags. Sorry for the confusion.
 //  2021-01-20: Inputs: calling new io.AddKeyAnalogEvent() for gamepad support, instead of writing directly to io.NavInputs[].
 //  2022-01-17: Inputs: calling new io.AddMousePosEvent(), io.AddMouseButtonEvent(), io.AddMouseWheelEvent() API (1.87+).
@@ -650,8 +651,10 @@ static bool ImGui_ImplOSX_HandleEvent(NSEvent* event, NSView* view)
         {
             mousePoint = event.locationInWindow;
             mousePoint = [view convertPoint:mousePoint fromView:nil]; // Convert to local coordinates of view
-            CGSize size = view.bounds.size;
-            mousePoint.y = size.height - mousePoint.y;
+            if ([view isFlipped])
+                mousePoint = NSMakePoint(mousePoint.x, mousePoint.y);
+            else
+                mousePoint = NSMakePoint(mousePoint.x, view.bounds.size.height - mousePoint.y);
         }
 
         io.AddMousePosEvent((float)mousePoint.x, (float)mousePoint.y);

backends/imgui_impl_sdl.cpp

@@ -21,6 +21,7 @@
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
 //  2022-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2022-10-11: Using 'nullptr' instead of 'NULL' as per our switch to C++11.
 //  2022-09-26: Inputs: Disable SDL 2.0.22 new "auto capture" (SDL_HINT_MOUSE_AUTO_CAPTURE) which prevents drag and drop across windows for multi-viewport support + don't capture when drag and dropping. (#5710)
 //  2022-09-26: Inputs: Renamed ImGuiKey_ModXXX introduced in 1.87 to ImGuiMod_XXX (old names still supported).
 //  2022-03-22: Inputs: Fix mouse position issues when dragging outside of boundaries. SDL_CaptureMouse() erroneously still gives out LEAVE events when hovering OS decorations.
@@ -113,7 +114,7 @@ struct ImGui_ImplSDL2_Data
 // FIXME: some shared resources (mouse cursor shape, gamepad) are mishandled when using multi-context.
 static ImGui_ImplSDL2_Data* ImGui_ImplSDL2_GetBackendData()
 {
-    return ImGui::GetCurrentContext() ? (ImGui_ImplSDL2_Data*)ImGui::GetIO().BackendPlatformUserData : NULL;
+    return ImGui::GetCurrentContext() ? (ImGui_ImplSDL2_Data*)ImGui::GetIO().BackendPlatformUserData : nullptr;
 }
 
 // Forward Declarations
@@ -358,7 +359,7 @@ bool ImGui_ImplSDL2_ProcessEvent(const SDL_Event* event)
 static bool ImGui_ImplSDL2_Init(SDL_Window* window, SDL_Renderer* renderer, void* sdl_gl_context)
 {
     ImGuiIO& io = ImGui::GetIO();
-    IM_ASSERT(io.BackendPlatformUserData == NULL && "Already initialized a platform backend!");
+    IM_ASSERT(io.BackendPlatformUserData == nullptr && "Already initialized a platform backend!");
 
     // Check and store if we are on a SDL backend that supports global mouse position
     // ("wayland" and "rpi" don't support it, but we chose to use a white-list instead of a black-list)
@@ -392,7 +393,7 @@ static bool ImGui_ImplSDL2_Init(SDL_Window* window, SDL_Renderer* renderer, void
 
     io.SetClipboardTextFn = ImGui_ImplSDL2_SetClipboardText;
     io.GetClipboardTextFn = ImGui_ImplSDL2_GetClipboardText;
-    io.ClipboardUserData = NULL;
+    io.ClipboardUserData = nullptr;
 
     // Load mouse cursors
     bd->MouseCursors[ImGuiMouseCursor_Arrow] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_ARROW);
@@ -409,7 +410,7 @@ static bool ImGui_ImplSDL2_Init(SDL_Window* window, SDL_Renderer* renderer, void
     // Our mouse update function expect PlatformHandle to be filled for the main viewport
     ImGuiViewport* main_viewport = ImGui::GetMainViewport();
     main_viewport->PlatformHandle = (void*)window;
-    main_viewport->PlatformHandleRaw = NULL;
+    main_viewport->PlatformHandleRaw = nullptr;
     SDL_SysWMinfo info;
     SDL_VERSION(&info.version);
     if (SDL_GetWindowWMInfo(window, &info))
@@ -448,7 +449,7 @@ static bool ImGui_ImplSDL2_Init(SDL_Window* window, SDL_Renderer* renderer, void
 
 bool ImGui_ImplSDL2_InitForOpenGL(SDL_Window* window, void* sdl_gl_context)
 {
-    return ImGui_ImplSDL2_Init(window, NULL, sdl_gl_context);
+    return ImGui_ImplSDL2_Init(window, nullptr, sdl_gl_context);
 }
 
 bool ImGui_ImplSDL2_InitForVulkan(SDL_Window* window)
@@ -456,7 +457,7 @@ bool ImGui_ImplSDL2_InitForVulkan(SDL_Window* window)
 #if !SDL_HAS_VULKAN
     IM_ASSERT(0 && "Unsupported");
 #endif
-    if (!ImGui_ImplSDL2_Init(window, NULL, NULL))
+    if (!ImGui_ImplSDL2_Init(window, nullptr, nullptr))
         return false;
     ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
     bd->UseVulkan = true;
@@ -468,23 +469,23 @@ bool ImGui_ImplSDL2_InitForD3D(SDL_Window* window)
 #if !defined(_WIN32)
     IM_ASSERT(0 && "Unsupported");
 #endif
-    return ImGui_ImplSDL2_Init(window, NULL, NULL);
+    return ImGui_ImplSDL2_Init(window, nullptr, nullptr);
 }
 
 bool ImGui_ImplSDL2_InitForMetal(SDL_Window* window)
 {
-    return ImGui_ImplSDL2_Init(window, NULL, NULL);
+    return ImGui_ImplSDL2_Init(window, nullptr, nullptr);
 }
 
 bool ImGui_ImplSDL2_InitForSDLRenderer(SDL_Window* window, SDL_Renderer* renderer)
 {
-    return ImGui_ImplSDL2_Init(window, renderer, NULL);
+    return ImGui_ImplSDL2_Init(window, renderer, nullptr);
 }
 
 void ImGui_ImplSDL2_Shutdown()
 {
     ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
-    IM_ASSERT(bd != NULL && "No platform backend to shutdown, or already shutdown?");
+    IM_ASSERT(bd != nullptr && "No platform backend to shutdown, or already shutdown?");
     ImGuiIO& io = ImGui::GetIO();
 
     ImGui_ImplSDL2_ShutdownPlatformInterface();
@@ -494,8 +495,8 @@ void ImGui_ImplSDL2_Shutdown()
     for (ImGuiMouseCursor cursor_n = 0; cursor_n < ImGuiMouseCursor_COUNT; cursor_n++)
         SDL_FreeCursor(bd->MouseCursors[cursor_n]);
 
-    io.BackendPlatformName = NULL;
-    io.BackendPlatformUserData = NULL;
+    io.BackendPlatformName = nullptr;
+    io.BackendPlatformUserData = nullptr;
     IM_DELETE(bd);
 }
 
@@ -508,7 +509,7 @@ static void ImGui_ImplSDL2_UpdateMouseData()
     // We forward mouse input when hovered or captured (via SDL_MOUSEMOTION) or when focused (below)
 #if SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE
     // SDL_CaptureMouse() let the OS know e.g. that our imgui drag outside the SDL window boundaries shouldn't e.g. trigger other operations outside
-    SDL_CaptureMouse((bd->MouseButtonsDown != 0 && ImGui::GetDragDropPayload() == NULL) ? SDL_TRUE : SDL_FALSE);
+    SDL_CaptureMouse((bd->MouseButtonsDown != 0 && ImGui::GetDragDropPayload() == nullptr) ? SDL_TRUE : SDL_FALSE);
     SDL_Window* focused_window = SDL_GetKeyboardFocus();
     const bool is_app_focused = (focused_window && (bd->Window == focused_window || ImGui::FindViewportByPlatformHandle((void*)focused_window)));
 #else
@@ -653,7 +654,7 @@ static void ImGui_ImplSDL2_UpdateMonitors()
         // FIXME-VIEWPORT: On MacOS SDL reports actual monitor DPI scale, ignoring OS configuration. We may want to set
         //  DpiScale to cocoa_window.backingScaleFactor here.
         float dpi = 0.0f;
-        if (!SDL_GetDisplayDPI(n, &dpi, NULL, NULL))
+        if (!SDL_GetDisplayDPI(n, &dpi, nullptr, nullptr))
             monitor.DpiScale = dpi / 96.0f;
 #endif
         platform_io.Monitors.push_back(monitor);
@@ -663,7 +664,7 @@ static void ImGui_ImplSDL2_UpdateMonitors()
 void ImGui_ImplSDL2_NewFrame()
 {
     ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
-    IM_ASSERT(bd != NULL && "Did you call ImGui_ImplSDL2_Init()?");
+    IM_ASSERT(bd != nullptr && "Did you call ImGui_ImplSDL2_Init()?");
     ImGuiIO& io = ImGui::GetIO();
 
     // Setup display size (every frame to accommodate for window resizing)
@@ -672,7 +673,7 @@ void ImGui_ImplSDL2_NewFrame()
     SDL_GetWindowSize(bd->Window, &w, &h);
     if (SDL_GetWindowFlags(bd->Window) & SDL_WINDOW_MINIMIZED)
         w = h = 0;
-    if (bd->Renderer != NULL)
+    if (bd->Renderer != nullptr)
         SDL_GetRendererOutputSize(bd->Renderer, &display_w, &display_h);
     else
         SDL_GL_GetDrawableSize(bd->Window, &display_w, &display_h);
@@ -714,8 +715,8 @@ struct ImGui_ImplSDL2_ViewportData
     bool            WindowOwned;
     SDL_GLContext   GLContext;
 
-    ImGui_ImplSDL2_ViewportData() { Window = NULL; WindowID = 0; WindowOwned = false; GLContext = NULL; }
-    ~ImGui_ImplSDL2_ViewportData() { IM_ASSERT(Window == NULL && GLContext == NULL); }
+    ImGui_ImplSDL2_ViewportData() { Window = nullptr; WindowID = 0; WindowOwned = false; GLContext = nullptr; }
+    ~ImGui_ImplSDL2_ViewportData() { IM_ASSERT(Window == nullptr && GLContext == nullptr); }
 };
 
 static void ImGui_ImplSDL2_CreateWindow(ImGuiViewport* viewport)
@@ -728,8 +729,8 @@ static void ImGui_ImplSDL2_CreateWindow(ImGuiViewport* viewport)
     ImGui_ImplSDL2_ViewportData* main_viewport_data = (ImGui_ImplSDL2_ViewportData*)main_viewport->PlatformUserData;
 
     // Share GL resources with main context
-    bool use_opengl = (main_viewport_data->GLContext != NULL);
-    SDL_GLContext backup_context = NULL;
+    bool use_opengl = (main_viewport_data->GLContext != nullptr);
+    SDL_GLContext backup_context = nullptr;
     if (use_opengl)
     {
         backup_context = SDL_GL_GetCurrentContext();
@@ -761,7 +762,7 @@ static void ImGui_ImplSDL2_CreateWindow(ImGuiViewport* viewport)
         SDL_GL_MakeCurrent(vd->Window, backup_context);
 
     viewport->PlatformHandle = (void*)vd->Window;
-    viewport->PlatformHandleRaw = NULL;
+    viewport->PlatformHandleRaw = nullptr;
     SDL_SysWMinfo info;
     SDL_VERSION(&info.version);
     if (SDL_GetWindowWMInfo(vd->Window, &info))
@@ -782,11 +783,11 @@ static void ImGui_ImplSDL2_DestroyWindow(ImGuiViewport* viewport)
             SDL_GL_DeleteContext(vd->GLContext);
         if (vd->Window && vd->WindowOwned)
             SDL_DestroyWindow(vd->Window);
-        vd->GLContext = NULL;
-        vd->Window = NULL;
+        vd->GLContext = nullptr;
+        vd->Window = nullptr;
         IM_DELETE(vd);
     }
-    viewport->PlatformUserData = viewport->PlatformHandle = NULL;
+    viewport->PlatformUserData = viewport->PlatformHandle = nullptr;
 }
 
 static void ImGui_ImplSDL2_ShowWindow(ImGuiViewport* viewport)

backends/imgui_impl_sdlrenderer.cpp

@@ -19,6 +19,7 @@
 // Read online: https://github.com/ocornut/imgui/tree/master/docs
 
 // CHANGELOG
+//  2022-10-11: Using 'nullptr' instead of 'NULL' as per our switch to C++11.
 //  2021-12-21: Update SDL_RenderGeometryRaw() format to work with SDL 2.0.19.
 //  2021-12-03: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
 //  2021-10-06: Backup and restore modified ClipRect/Viewport.
@@ -50,15 +51,15 @@ struct ImGui_ImplSDLRenderer_Data
 // It is STRONGLY preferred that you use docking branch with multi-viewports (== single Dear ImGui context + multiple windows) instead of multiple Dear ImGui contexts.
 static ImGui_ImplSDLRenderer_Data* ImGui_ImplSDLRenderer_GetBackendData()
 {
-    return ImGui::GetCurrentContext() ? (ImGui_ImplSDLRenderer_Data*)ImGui::GetIO().BackendRendererUserData : NULL;
+    return ImGui::GetCurrentContext() ? (ImGui_ImplSDLRenderer_Data*)ImGui::GetIO().BackendRendererUserData : nullptr;
 }
 
 // Functions
 bool ImGui_ImplSDLRenderer_Init(SDL_Renderer* renderer)
 {
     ImGuiIO& io = ImGui::GetIO();
-    IM_ASSERT(io.BackendRendererUserData == NULL && "Already initialized a renderer backend!");
-    IM_ASSERT(renderer != NULL && "SDL_Renderer not initialized!");
+    IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
+    IM_ASSERT(renderer != nullptr && "SDL_Renderer not initialized!");
 
     // Setup backend capabilities flags
     ImGui_ImplSDLRenderer_Data* bd = IM_NEW(ImGui_ImplSDLRenderer_Data)();
@@ -74,13 +75,13 @@ bool ImGui_ImplSDLRenderer_Init(SDL_Renderer* renderer)
 void ImGui_ImplSDLRenderer_Shutdown()
 {
     ImGui_ImplSDLRenderer_Data* bd = ImGui_ImplSDLRenderer_GetBackendData();
-    IM_ASSERT(bd != NULL && "No renderer backend to shutdown, or already shutdown?");
+    IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?");
     ImGuiIO& io = ImGui::GetIO();
 
     ImGui_ImplSDLRenderer_DestroyDeviceObjects();
 
-    io.BackendRendererName = NULL;
-    io.BackendRendererUserData = NULL;
+    io.BackendRendererName = nullptr;
+    io.BackendRendererUserData = nullptr;
     IM_DELETE(bd);
 }
 
@@ -90,14 +91,14 @@ static void ImGui_ImplSDLRenderer_SetupRenderState()
 
 	// Clear out any viewports and cliprect set by the user
     // FIXME: Technically speaking there are lots of other things we could backup/setup/restore during our render process.
-	SDL_RenderSetViewport(bd->SDLRenderer, NULL);
-	SDL_RenderSetClipRect(bd->SDLRenderer, NULL);
+	SDL_RenderSetViewport(bd->SDLRenderer, nullptr);
+	SDL_RenderSetClipRect(bd->SDLRenderer, nullptr);
 }
 
 void ImGui_ImplSDLRenderer_NewFrame()
 {
     ImGui_ImplSDLRenderer_Data* bd = ImGui_ImplSDLRenderer_GetBackendData();
-    IM_ASSERT(bd != NULL && "Did you call ImGui_ImplSDLRenderer_Init()?");
+    IM_ASSERT(bd != nullptr && "Did you call ImGui_ImplSDLRenderer_Init()?");
 
     if (!bd->FontTexture)
         ImGui_ImplSDLRenderer_CreateDeviceObjects();
@@ -166,20 +167,20 @@ void ImGui_ImplSDLRenderer_RenderDrawData(ImDrawData* draw_data)
                 ImVec2 clip_max((pcmd->ClipRect.z - clip_off.x) * clip_scale.x, (pcmd->ClipRect.w - clip_off.y) * clip_scale.y);
                 if (clip_min.x < 0.0f) { clip_min.x = 0.0f; }
                 if (clip_min.y < 0.0f) { clip_min.y = 0.0f; }
-                if (clip_max.x > fb_width) { clip_max.x = (float)fb_width; }
-                if (clip_max.y > fb_height) { clip_max.y = (float)fb_height; }
+                if (clip_max.x > (float)fb_width) { clip_max.x = (float)fb_width; }
+                if (clip_max.y > (float)fb_height) { clip_max.y = (float)fb_height; }
                 if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
                     continue;
 
                 SDL_Rect r = { (int)(clip_min.x), (int)(clip_min.y), (int)(clip_max.x - clip_min.x), (int)(clip_max.y - clip_min.y) };
                 SDL_RenderSetClipRect(bd->SDLRenderer, &r);
 
-                const float* xy = (const float*)((const char*)(vtx_buffer + pcmd->VtxOffset) + IM_OFFSETOF(ImDrawVert, pos));
-                const float* uv = (const float*)((const char*)(vtx_buffer + pcmd->VtxOffset) + IM_OFFSETOF(ImDrawVert, uv));
+                const float* xy = (const float*)(const void*)((const char*)(vtx_buffer + pcmd->VtxOffset) + IM_OFFSETOF(ImDrawVert, pos));
+                const float* uv = (const float*)(const void*)((const char*)(vtx_buffer + pcmd->VtxOffset) + IM_OFFSETOF(ImDrawVert, uv));
 #if SDL_VERSION_ATLEAST(2,0,19)
-                const SDL_Color* color = (const SDL_Color*)((const char*)(vtx_buffer + pcmd->VtxOffset) + IM_OFFSETOF(ImDrawVert, col)); // SDL 2.0.19+
+                const SDL_Color* color = (const SDL_Color*)(const void*)((const char*)(vtx_buffer + pcmd->VtxOffset) + IM_OFFSETOF(ImDrawVert, col)); // SDL 2.0.19+
 #else
-                const int* color = (const int*)((const char*)(vtx_buffer + pcmd->VtxOffset) + IM_OFFSETOF(ImDrawVert, col)); // SDL 2.0.17 and 2.0.18
+                const int* color = (const int*)(const void*)((const char*)(vtx_buffer + pcmd->VtxOffset) + IM_OFFSETOF(ImDrawVert, col)); // SDL 2.0.17 and 2.0.18
 #endif
 
                 // Bind texture, Draw
@@ -196,7 +197,7 @@ void ImGui_ImplSDLRenderer_RenderDrawData(ImDrawData* draw_data)
 
     // Restore modified SDL_Renderer state
     SDL_RenderSetViewport(bd->SDLRenderer, &old.Viewport);
-    SDL_RenderSetClipRect(bd->SDLRenderer, old.ClipEnabled ? &old.ClipRect : NULL);
+    SDL_RenderSetClipRect(bd->SDLRenderer, old.ClipEnabled ? &old.ClipRect : nullptr);
 }
 
 // Called by Init/NewFrame/Shutdown
@@ -213,12 +214,12 @@ bool ImGui_ImplSDLRenderer_CreateFontsTexture()
     // Upload texture to graphics system
     // (Bilinear sampling is required by default. Set 'io.Fonts->Flags |= ImFontAtlasFlags_NoBakedLines' or 'style.AntiAliasedLinesUseTex = false' to allow point/nearest sampling)
     bd->FontTexture = SDL_CreateTexture(bd->SDLRenderer, SDL_PIXELFORMAT_ABGR8888, SDL_TEXTUREACCESS_STATIC, width, height);
-    if (bd->FontTexture == NULL)
+    if (bd->FontTexture == nullptr)
     {
         SDL_Log("error creating texture");
         return false;
     }
-    SDL_UpdateTexture(bd->FontTexture, NULL, pixels, 4 * width);
+    SDL_UpdateTexture(bd->FontTexture, nullptr, pixels, 4 * width);
     SDL_SetTextureBlendMode(bd->FontTexture, SDL_BLENDMODE_BLEND);
     SDL_SetTextureScaleMode(bd->FontTexture, SDL_ScaleModeLinear);
 
@@ -236,7 +237,7 @@ void ImGui_ImplSDLRenderer_DestroyFontsTexture()
     {
         io.Fonts->SetTexID(0);
         SDL_DestroyTexture(bd->FontTexture);
-        bd->FontTexture = NULL;
+        bd->FontTexture = nullptr;
     }
 }
 

backends/imgui_impl_vulkan.cpp

@@ -32,6 +32,9 @@
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
 //  2022-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2022-10-11: Using 'nullptr' instead of 'NULL' as per our switch to C++11.
+//  2022-10-04: Vulkan: Added experimental ImGui_ImplVulkan_RemoveTexture() for api symetry. (#914, #5738).
+//  2022-01-20: Vulkan: Added support for ImTextureID as VkDescriptorSet. User need to call ImGui_ImplVulkan_AddTexture(). Building for 32-bit targets requires '#define ImTextureID ImU64'. (#914).
 //  2021-10-15: Vulkan: Call vkCmdSetScissor() at the end of render a full-viewport to reduce likehood of issues with people using VK_DYNAMIC_STATE_SCISSOR in their app without calling vkCmdSetScissor() explicitly every frame.
 //  2021-06-29: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX).
 //  2021-03-22: Vulkan: Fix mapped memory validation error when buffer sizes are not multiple of VkPhysicalDeviceLimits::nonCoherentAtomSize.
@@ -204,6 +207,7 @@ static bool g_FunctionsLoaded = true;
     IMGUI_VULKAN_FUNC_MAP_MACRO(vkDeviceWaitIdle) \
     IMGUI_VULKAN_FUNC_MAP_MACRO(vkFlushMappedMemoryRanges) \
     IMGUI_VULKAN_FUNC_MAP_MACRO(vkFreeCommandBuffers) \
+    IMGUI_VULKAN_FUNC_MAP_MACRO(vkFreeDescriptorSets) \
     IMGUI_VULKAN_FUNC_MAP_MACRO(vkFreeMemory) \
     IMGUI_VULKAN_FUNC_MAP_MACRO(vkGetBufferMemoryRequirements) \
     IMGUI_VULKAN_FUNC_MAP_MACRO(vkGetImageMemoryRequirements) \
@@ -355,7 +359,7 @@ static uint32_t __glsl_shader_frag_spv[] =
 // FIXME: multi-context support is not tested and probably dysfunctional in this backend.
 static ImGui_ImplVulkan_Data* ImGui_ImplVulkan_GetBackendData()
 {
-    return ImGui::GetCurrentContext() ? (ImGui_ImplVulkan_Data*)ImGui::GetIO().BackendRendererUserData : NULL;
+    return ImGui::GetCurrentContext() ? (ImGui_ImplVulkan_Data*)ImGui::GetIO().BackendRendererUserData : nullptr;
 }
 
 static uint32_t ImGui_ImplVulkan_MemoryType(VkMemoryPropertyFlags properties, uint32_t type_bits)
@@ -474,9 +478,9 @@ void ImGui_ImplVulkan_RenderDrawData(ImDrawData* draw_data, VkCommandBuffer comm
 
     // Allocate array to store enough vertex/index buffers. Each unique viewport gets its own storage.
     ImGui_ImplVulkan_ViewportData* viewport_renderer_data = (ImGui_ImplVulkan_ViewportData*)draw_data->OwnerViewport->RendererUserData;
-    IM_ASSERT(viewport_renderer_data != NULL);
+    IM_ASSERT(viewport_renderer_data != nullptr);
     ImGui_ImplVulkanH_WindowRenderBuffers* wrb = &viewport_renderer_data->RenderBuffers;
-    if (wrb->FrameRenderBuffers == NULL)
+    if (wrb->FrameRenderBuffers == nullptr)
     {
         wrb->Index = 0;
         wrb->Count = v->ImageCount;
@@ -498,8 +502,8 @@ void ImGui_ImplVulkan_RenderDrawData(ImDrawData* draw_data, VkCommandBuffer comm
             CreateOrResizeBuffer(rb->IndexBuffer, rb->IndexBufferMemory, rb->IndexBufferSize, index_size, VK_BUFFER_USAGE_INDEX_BUFFER_BIT);
 
         // Upload vertex/index data into a single contiguous GPU buffer
-        ImDrawVert* vtx_dst = NULL;
-        ImDrawIdx* idx_dst = NULL;
+        ImDrawVert* vtx_dst = nullptr;
+        ImDrawIdx* idx_dst = nullptr;
         VkResult err = vkMapMemory(v->Device, rb->VertexBufferMemory, 0, rb->VertexBufferSize, 0, (void**)(&vtx_dst));
         check_vk_result(err);
         err = vkMapMemory(v->Device, rb->IndexBufferMemory, 0, rb->IndexBufferSize, 0, (void**)(&idx_dst));
@@ -542,7 +546,7 @@ void ImGui_ImplVulkan_RenderDrawData(ImDrawData* draw_data, VkCommandBuffer comm
         for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
         {
             const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
-            if (pcmd->UserCallback != NULL)
+            if (pcmd->UserCallback != nullptr)
             {
                 // User callback, registered via ImDrawList::AddCallback()
                 // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
@@ -581,7 +585,7 @@ void ImGui_ImplVulkan_RenderDrawData(ImDrawData* draw_data, VkCommandBuffer comm
                     IM_ASSERT(pcmd->TextureId == (ImTextureID)bd->FontDescriptorSet);
                     desc_set[0] = bd->FontDescriptorSet;
                 }
-                vkCmdBindDescriptorSets(command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS, bd->PipelineLayout, 0, 1, desc_set, 0, NULL);
+                vkCmdBindDescriptorSets(command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS, bd->PipelineLayout, 0, 1, desc_set, 0, nullptr);
 
                 // Draw
                 vkCmdDrawIndexed(command_buffer, pcmd->ElemCount, 1, pcmd->IdxOffset + global_idx_offset, pcmd->VtxOffset + global_vtx_offset, 0);
@@ -686,7 +690,7 @@ bool ImGui_ImplVulkan_CreateFontsTexture(VkCommandBuffer command_buffer)
 
     // Upload to Buffer:
     {
-        char* map = NULL;
+        char* map = nullptr;
         err = vkMapMemory(v->Device, bd->UploadBufferMemory, 0, upload_size, 0, (void**)(&map));
         check_vk_result(err);
         memcpy(map, pixels, upload_size);
@@ -712,7 +716,7 @@ bool ImGui_ImplVulkan_CreateFontsTexture(VkCommandBuffer command_buffer)
         copy_barrier[0].subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
         copy_barrier[0].subresourceRange.levelCount = 1;
         copy_barrier[0].subresourceRange.layerCount = 1;
-        vkCmdPipelineBarrier(command_buffer, VK_PIPELINE_STAGE_HOST_BIT, VK_PIPELINE_STAGE_TRANSFER_BIT, 0, 0, NULL, 0, NULL, 1, copy_barrier);
+        vkCmdPipelineBarrier(command_buffer, VK_PIPELINE_STAGE_HOST_BIT, VK_PIPELINE_STAGE_TRANSFER_BIT, 0, 0, nullptr, 0, nullptr, 1, copy_barrier);
 
         VkBufferImageCopy region = {};
         region.imageSubresource.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
@@ -734,7 +738,7 @@ bool ImGui_ImplVulkan_CreateFontsTexture(VkCommandBuffer command_buffer)
         use_barrier[0].subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
         use_barrier[0].subresourceRange.levelCount = 1;
         use_barrier[0].subresourceRange.layerCount = 1;
-        vkCmdPipelineBarrier(command_buffer, VK_PIPELINE_STAGE_TRANSFER_BIT, VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT, 0, 0, NULL, 0, NULL, 1, use_barrier);
+        vkCmdPipelineBarrier(command_buffer, VK_PIPELINE_STAGE_TRANSFER_BIT, VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT, 0, 0, nullptr, 0, nullptr, 1, use_barrier);
     }
 
     // Store our identifier
@@ -1044,7 +1048,7 @@ bool    ImGui_ImplVulkan_LoadFunctions(PFN_vkVoidFunction(*loader_func)(const ch
 #ifdef VK_NO_PROTOTYPES
 #define IMGUI_VULKAN_FUNC_LOAD(func) \
     func = reinterpret_cast<decltype(func)>(loader_func(#func, user_data)); \
-    if (func == NULL)   \
+    if (func == nullptr)   \
         return false;
     IMGUI_VULKAN_FUNC_MAP(IMGUI_VULKAN_FUNC_LOAD)
 #undef IMGUI_VULKAN_FUNC_LOAD
@@ -1061,7 +1065,7 @@ bool    ImGui_ImplVulkan_Init(ImGui_ImplVulkan_InitInfo* info, VkRenderPass rend
     IM_ASSERT(g_FunctionsLoaded && "Need to call ImGui_ImplVulkan_LoadFunctions() if IMGUI_IMPL_VULKAN_NO_PROTOTYPES or VK_NO_PROTOTYPES are set!");
 
     ImGuiIO& io = ImGui::GetIO();
-    IM_ASSERT(io.BackendRendererUserData == NULL && "Already initialized a renderer backend!");
+    IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
 
     // Setup backend capabilities flags
     ImGui_ImplVulkan_Data* bd = IM_NEW(ImGui_ImplVulkan_Data)();
@@ -1098,7 +1102,7 @@ bool    ImGui_ImplVulkan_Init(ImGui_ImplVulkan_InitInfo* info, VkRenderPass rend
 void ImGui_ImplVulkan_Shutdown()
 {
     ImGui_ImplVulkan_Data* bd = ImGui_ImplVulkan_GetBackendData();
-    IM_ASSERT(bd != NULL && "No renderer backend to shutdown, or already shutdown?");
+    IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?");
     ImGuiIO& io = ImGui::GetIO();
 
     // First destroy objects in all viewports
@@ -1108,20 +1112,20 @@ void ImGui_ImplVulkan_Shutdown()
     ImGuiViewport* main_viewport = ImGui::GetMainViewport();
     if (ImGui_ImplVulkan_ViewportData* vd = (ImGui_ImplVulkan_ViewportData*)main_viewport->RendererUserData)
         IM_DELETE(vd);
-    main_viewport->RendererUserData = NULL;
+    main_viewport->RendererUserData = nullptr;
 
     // Clean up windows
     ImGui_ImplVulkan_ShutdownPlatformInterface();
 
-    io.BackendRendererName = NULL;
-    io.BackendRendererUserData = NULL;
+    io.BackendRendererName = nullptr;
+    io.BackendRendererUserData = nullptr;
     IM_DELETE(bd);
 }
 
 void ImGui_ImplVulkan_NewFrame()
 {
     ImGui_ImplVulkan_Data* bd = ImGui_ImplVulkan_GetBackendData();
-    IM_ASSERT(bd != NULL && "Did you call ImGui_ImplVulkan_Init()?");
+    IM_ASSERT(bd != nullptr && "Did you call ImGui_ImplVulkan_Init()?");
     IM_UNUSED(bd);
 }
 
@@ -1172,11 +1176,18 @@ VkDescriptorSet ImGui_ImplVulkan_AddTexture(VkSampler sampler, VkImageView image
         write_desc[0].descriptorCount = 1;
         write_desc[0].descriptorType = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
         write_desc[0].pImageInfo = desc_image;
-        vkUpdateDescriptorSets(v->Device, 1, write_desc, 0, NULL);
+        vkUpdateDescriptorSets(v->Device, 1, write_desc, 0, nullptr);
     }
     return descriptor_set;
 }
 
+void ImGui_ImplVulkan_RemoveTexture(VkDescriptorSet descriptor_set)
+{
+    ImGui_ImplVulkan_Data* bd = ImGui_ImplVulkan_GetBackendData();
+    ImGui_ImplVulkan_InitInfo* v = &bd->VulkanInitInfo;
+    vkFreeDescriptorSets(v->Device, v->DescriptorPool, 1, &descriptor_set);
+}
+
 //-------------------------------------------------------------------------
 // Internal / Miscellaneous Vulkan Helpers
 // (Used by example's main.cpp. Used by multi-viewport features. PROBABLY NOT used by your own app.)
@@ -1196,7 +1207,7 @@ VkDescriptorSet ImGui_ImplVulkan_AddTexture(VkSampler sampler, VkImageView image
 VkSurfaceFormatKHR ImGui_ImplVulkanH_SelectSurfaceFormat(VkPhysicalDevice physical_device, VkSurfaceKHR surface, const VkFormat* request_formats, int request_formats_count, VkColorSpaceKHR request_color_space)
 {
     IM_ASSERT(g_FunctionsLoaded && "Need to call ImGui_ImplVulkan_LoadFunctions() if IMGUI_IMPL_VULKAN_NO_PROTOTYPES or VK_NO_PROTOTYPES are set!");
-    IM_ASSERT(request_formats != NULL);
+    IM_ASSERT(request_formats != nullptr);
     IM_ASSERT(request_formats_count > 0);
 
     // Per Spec Format and View Format are expected to be the same unless VK_IMAGE_CREATE_MUTABLE_BIT was set at image creation
@@ -1204,7 +1215,7 @@ VkSurfaceFormatKHR ImGui_ImplVulkanH_SelectSurfaceFormat(VkPhysicalDevice physic
     // Additionally several new color spaces were introduced with Vulkan Spec v1.0.40,
     // hence we must make sure that a format with the mostly available color space, VK_COLOR_SPACE_SRGB_NONLINEAR_KHR, is found and used.
     uint32_t avail_count;
-    vkGetPhysicalDeviceSurfaceFormatsKHR(physical_device, surface, &avail_count, NULL);
+    vkGetPhysicalDeviceSurfaceFormatsKHR(physical_device, surface, &avail_count, nullptr);
     ImVector<VkSurfaceFormatKHR> avail_format;
     avail_format.resize((int)avail_count);
     vkGetPhysicalDeviceSurfaceFormatsKHR(physical_device, surface, &avail_count, avail_format.Data);
@@ -1241,12 +1252,12 @@ VkSurfaceFormatKHR ImGui_ImplVulkanH_SelectSurfaceFormat(VkPhysicalDevice physic
 VkPresentModeKHR ImGui_ImplVulkanH_SelectPresentMode(VkPhysicalDevice physical_device, VkSurfaceKHR surface, const VkPresentModeKHR* request_modes, int request_modes_count)
 {
     IM_ASSERT(g_FunctionsLoaded && "Need to call ImGui_ImplVulkan_LoadFunctions() if IMGUI_IMPL_VULKAN_NO_PROTOTYPES or VK_NO_PROTOTYPES are set!");
-    IM_ASSERT(request_modes != NULL);
+    IM_ASSERT(request_modes != nullptr);
     IM_ASSERT(request_modes_count > 0);
 
     // Request a certain mode and confirm that it is available. If not use VK_PRESENT_MODE_FIFO_KHR which is mandatory
     uint32_t avail_count = 0;
-    vkGetPhysicalDeviceSurfacePresentModesKHR(physical_device, surface, &avail_count, NULL);
+    vkGetPhysicalDeviceSurfacePresentModesKHR(physical_device, surface, &avail_count, nullptr);
     ImVector<VkPresentModeKHR> avail_modes;
     avail_modes.resize((int)avail_count);
     vkGetPhysicalDeviceSurfacePresentModesKHR(physical_device, surface, &avail_count, avail_modes.Data);
@@ -1338,8 +1349,8 @@ void ImGui_ImplVulkanH_CreateWindowSwapChain(VkPhysicalDevice physical_device, V
     }
     IM_FREE(wd->Frames);
     IM_FREE(wd->FrameSemaphores);
-    wd->Frames = NULL;
-    wd->FrameSemaphores = NULL;
+    wd->Frames = nullptr;
+    wd->FrameSemaphores = nullptr;
     wd->ImageCount = 0;
     if (wd->RenderPass)
         vkDestroyRenderPass(device, wd->RenderPass, allocator);
@@ -1386,7 +1397,7 @@ void ImGui_ImplVulkanH_CreateWindowSwapChain(VkPhysicalDevice physical_device, V
         }
         err = vkCreateSwapchainKHR(device, &info, allocator, &wd->Swapchain);
         check_vk_result(err);
-        err = vkGetSwapchainImagesKHR(device, wd->Swapchain, &wd->ImageCount, NULL);
+        err = vkGetSwapchainImagesKHR(device, wd->Swapchain, &wd->ImageCount, nullptr);
         check_vk_result(err);
         VkImage backbuffers[16] = {};
         IM_ASSERT(wd->ImageCount >= min_image_count);
@@ -1394,7 +1405,7 @@ void ImGui_ImplVulkanH_CreateWindowSwapChain(VkPhysicalDevice physical_device, V
         err = vkGetSwapchainImagesKHR(device, wd->Swapchain, &wd->ImageCount, backbuffers);
         check_vk_result(err);
 
-        IM_ASSERT(wd->Frames == NULL);
+        IM_ASSERT(wd->Frames == nullptr);
         wd->Frames = (ImGui_ImplVulkanH_Frame*)IM_ALLOC(sizeof(ImGui_ImplVulkanH_Frame) * wd->ImageCount);
         wd->FrameSemaphores = (ImGui_ImplVulkanH_FrameSemaphores*)IM_ALLOC(sizeof(ImGui_ImplVulkanH_FrameSemaphores) * wd->ImageCount);
         memset(wd->Frames, 0, sizeof(wd->Frames[0]) * wd->ImageCount);
@@ -1510,8 +1521,8 @@ void ImGui_ImplVulkanH_DestroyWindow(VkInstance instance, VkDevice device, ImGui
     }
     IM_FREE(wd->Frames);
     IM_FREE(wd->FrameSemaphores);
-    wd->Frames = NULL;
-    wd->FrameSemaphores = NULL;
+    wd->Frames = nullptr;
+    wd->FrameSemaphores = nullptr;
     vkDestroyPipeline(device, wd->Pipeline, allocator);
     vkDestroyRenderPass(device, wd->RenderPass, allocator);
     vkDestroySwapchainKHR(device, wd->Swapchain, allocator);
@@ -1555,7 +1566,7 @@ void ImGui_ImplVulkanH_DestroyWindowRenderBuffers(VkDevice device, ImGui_ImplVul
     for (uint32_t n = 0; n < buffers->Count; n++)
         ImGui_ImplVulkanH_DestroyFrameRenderBuffers(device, &buffers->FrameRenderBuffers[n], allocator);
     IM_FREE(buffers->FrameRenderBuffers);
-    buffers->FrameRenderBuffers = NULL;
+    buffers->FrameRenderBuffers = nullptr;
     buffers->Index = 0;
     buffers->Count = 0;
 }
@@ -1625,14 +1636,14 @@ static void ImGui_ImplVulkan_DestroyWindow(ImGuiViewport* viewport)
         ImGui_ImplVulkanH_DestroyWindowRenderBuffers(v->Device, &vd->RenderBuffers, v->Allocator);
         IM_DELETE(vd);
     }
-    viewport->RendererUserData = NULL;
+    viewport->RendererUserData = nullptr;
 }
 
 static void ImGui_ImplVulkan_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
 {
     ImGui_ImplVulkan_Data* bd = ImGui_ImplVulkan_GetBackendData();
     ImGui_ImplVulkan_ViewportData* vd = (ImGui_ImplVulkan_ViewportData*)viewport->RendererUserData;
-    if (vd == NULL) // This is NULL for the main viewport (which is left to the user/app to handle)
+    if (vd == nullptr) // This is nullptr for the main viewport (which is left to the user/app to handle)
         return;
     ImGui_ImplVulkan_InitInfo* v = &bd->VulkanInitInfo;
     vd->Window.ClearEnable = (viewport->Flags & ImGuiViewportFlags_NoRendererClear) ? false : true;
@@ -1682,7 +1693,7 @@ static void ImGui_ImplVulkan_RenderWindow(ImGuiViewport* viewport, void*)
             info.renderArea.extent.width = wd->Width;
             info.renderArea.extent.height = wd->Height;
             info.clearValueCount = (viewport->Flags & ImGuiViewportFlags_NoRendererClear) ? 0 : 1;
-            info.pClearValues = (viewport->Flags & ImGuiViewportFlags_NoRendererClear) ? NULL : &wd->ClearValue;
+            info.pClearValues = (viewport->Flags & ImGuiViewportFlags_NoRendererClear) ? nullptr : &wd->ClearValue;
             vkCmdBeginRenderPass(fd->CommandBuffer, &info, VK_SUBPASS_CONTENTS_INLINE);
         }
     }
@@ -1745,7 +1756,7 @@ void ImGui_ImplVulkan_InitPlatformInterface()
 {
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
     if (ImGui::GetIO().ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
-        IM_ASSERT(platform_io.Platform_CreateVkSurface != NULL && "Platform needs to setup the CreateVkSurface handler.");
+        IM_ASSERT(platform_io.Platform_CreateVkSurface != nullptr && "Platform needs to setup the CreateVkSurface handler.");
     platform_io.Renderer_CreateWindow = ImGui_ImplVulkan_CreateWindow;
     platform_io.Renderer_DestroyWindow = ImGui_ImplVulkan_DestroyWindow;
     platform_io.Renderer_SetWindowSize = ImGui_ImplVulkan_SetWindowSize;

backends/imgui_impl_vulkan.h

@@ -74,12 +74,14 @@ IMGUI_IMPL_API void         ImGui_ImplVulkan_DestroyFontUploadObjects();
 IMGUI_IMPL_API void         ImGui_ImplVulkan_SetMinImageCount(uint32_t min_image_count); // To override MinImageCount after initialization (e.g. if swap chain is recreated)
 
 // Register a texture (VkDescriptorSet == ImTextureID)
-// FIXME: This is experimental in the sense that we are unsure how to best design/tackle this problem, please post to https://github.com/ocornut/imgui/pull/914 if you have suggestions.
+// FIXME: This is experimental in the sense that we are unsure how to best design/tackle this problem
+// Please post to https://github.com/ocornut/imgui/pull/914 if you have suggestions.
 IMGUI_IMPL_API VkDescriptorSet ImGui_ImplVulkan_AddTexture(VkSampler sampler, VkImageView image_view, VkImageLayout image_layout);
+IMGUI_IMPL_API void            ImGui_ImplVulkan_RemoveTexture(VkDescriptorSet descriptor_set);
 
 // Optional: load Vulkan functions with a custom function loader
 // This is only useful with IMGUI_IMPL_VULKAN_NO_PROTOTYPES / VK_NO_PROTOTYPES
-IMGUI_IMPL_API bool         ImGui_ImplVulkan_LoadFunctions(PFN_vkVoidFunction(*loader_func)(const char* function_name, void* user_data), void* user_data = NULL);
+IMGUI_IMPL_API bool         ImGui_ImplVulkan_LoadFunctions(PFN_vkVoidFunction(*loader_func)(const char* function_name, void* user_data), void* user_data = nullptr);
 
 //-------------------------------------------------------------------------
 // Internal / Miscellaneous Vulkan Helpers

backends/imgui_impl_wgpu.cpp

@@ -13,6 +13,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2022-10-11: Using 'nullptr' instead of 'NULL' as per our switch to C++11.
 //  2021-11-29: Passing explicit buffer sizes to wgpuRenderPassEncoderSetVertexBuffer()/wgpuRenderPassEncoderSetIndexBuffer().
 //  2021-08-24: Fix for latest specs.
 //  2021-05-24: Add support for draw_data->FramebufferScale.
@@ -30,10 +31,10 @@
 extern ImGuiID ImHashData(const void* data_p, size_t data_size, ImU32 seed = 0);
 
 // WebGPU data
-static WGPUDevice               g_wgpuDevice = NULL;
-static WGPUQueue                g_defaultQueue = NULL;
+static WGPUDevice               g_wgpuDevice = nullptr;
+static WGPUQueue                g_defaultQueue = nullptr;
 static WGPUTextureFormat        g_renderTargetFormat = WGPUTextureFormat_Undefined;
-static WGPURenderPipeline       g_pipelineState = NULL;
+static WGPURenderPipeline       g_pipelineState = nullptr;
 
 struct RenderResources
 {
@@ -57,7 +58,7 @@ struct FrameResources
     int         IndexBufferSize;
     int         VertexBufferSize;
 };
-static FrameResources*  g_pFrameResources = NULL;
+static FrameResources*  g_pFrameResources = nullptr;
 static unsigned int     g_numFramesInFlight = 0;
 static unsigned int     g_frameIndex = UINT_MAX;
 
@@ -182,61 +183,61 @@ static void SafeRelease(ImDrawIdx*& res)
 {
     if (res)
         delete[] res;
-    res = NULL;
+    res = nullptr;
 }
 static void SafeRelease(ImDrawVert*& res)
 {
     if (res)
         delete[] res;
-    res = NULL;
+    res = nullptr;
 }
 static void SafeRelease(WGPUBindGroupLayout& res)
 {
     if (res)
         wgpuBindGroupLayoutRelease(res);
-    res = NULL;
+    res = nullptr;
 }
 static void SafeRelease(WGPUBindGroup& res)
 {
     if (res)
         wgpuBindGroupRelease(res);
-    res = NULL;
+    res = nullptr;
 }
 static void SafeRelease(WGPUBuffer& res)
 {
     if (res)
         wgpuBufferRelease(res);
-    res = NULL;
+    res = nullptr;
 }
 static void SafeRelease(WGPURenderPipeline& res)
 {
     if (res)
         wgpuRenderPipelineRelease(res);
-    res = NULL;
+    res = nullptr;
 }
 static void SafeRelease(WGPUSampler& res)
 {
     if (res)
         wgpuSamplerRelease(res);
-    res = NULL;
+    res = nullptr;
 }
 static void SafeRelease(WGPUShaderModule& res)
 {
     if (res)
         wgpuShaderModuleRelease(res);
-    res = NULL;
+    res = nullptr;
 }
 static void SafeRelease(WGPUTextureView& res)
 {
     if (res)
         wgpuTextureViewRelease(res);
-    res = NULL;
+    res = nullptr;
 }
 static void SafeRelease(WGPUTexture& res)
 {
     if (res)
         wgpuTextureRelease(res);
-    res = NULL;
+    res = nullptr;
 }
 
 static void SafeRelease(RenderResources& res)
@@ -311,7 +312,7 @@ static void ImGui_ImplWGPU_SetupRenderState(ImDrawData* draw_data, WGPURenderPas
     wgpuRenderPassEncoderSetVertexBuffer(ctx, 0, fr->VertexBuffer, 0, fr->VertexBufferSize * sizeof(ImDrawVert));
     wgpuRenderPassEncoderSetIndexBuffer(ctx, fr->IndexBuffer, sizeof(ImDrawIdx) == 2 ? WGPUIndexFormat_Uint16 : WGPUIndexFormat_Uint32, 0, fr->IndexBufferSize * sizeof(ImDrawIdx));
     wgpuRenderPassEncoderSetPipeline(ctx, g_pipelineState);
-    wgpuRenderPassEncoderSetBindGroup(ctx, 0, g_resources.CommonBindGroup, 0, NULL);
+    wgpuRenderPassEncoderSetBindGroup(ctx, 0, g_resources.CommonBindGroup, 0, nullptr);
 
     // Setup blend factor
     WGPUColor blend_color = { 0.f, 0.f, 0.f, 0.f };
@@ -332,7 +333,7 @@ void ImGui_ImplWGPU_RenderDrawData(ImDrawData* draw_data, WGPURenderPassEncoder
     FrameResources* fr = &g_pFrameResources[g_frameIndex % g_numFramesInFlight];
 
     // Create and grow vertex/index buffers if needed
-    if (fr->VertexBuffer == NULL || fr->VertexBufferSize < draw_data->TotalVtxCount)
+    if (fr->VertexBuffer == nullptr || fr->VertexBufferSize < draw_data->TotalVtxCount)
     {
         if (fr->VertexBuffer)
         {
@@ -344,7 +345,7 @@ void ImGui_ImplWGPU_RenderDrawData(ImDrawData* draw_data, WGPURenderPassEncoder
 
         WGPUBufferDescriptor vb_desc =
         {
-            NULL,
+            nullptr,
             "Dear ImGui Vertex buffer",
             WGPUBufferUsage_CopyDst | WGPUBufferUsage_Vertex,
             fr->VertexBufferSize * sizeof(ImDrawVert),
@@ -356,7 +357,7 @@ void ImGui_ImplWGPU_RenderDrawData(ImDrawData* draw_data, WGPURenderPassEncoder
 
         fr->VertexBufferHost = new ImDrawVert[fr->VertexBufferSize];
     }
-    if (fr->IndexBuffer == NULL || fr->IndexBufferSize < draw_data->TotalIdxCount)
+    if (fr->IndexBuffer == nullptr || fr->IndexBufferSize < draw_data->TotalIdxCount)
     {
         if (fr->IndexBuffer)
         {
@@ -368,7 +369,7 @@ void ImGui_ImplWGPU_RenderDrawData(ImDrawData* draw_data, WGPURenderPassEncoder
 
         WGPUBufferDescriptor ib_desc =
         {
-            NULL,
+            nullptr,
             "Dear ImGui Index buffer",
             WGPUBufferUsage_CopyDst | WGPUBufferUsage_Index,
             fr->IndexBufferSize * sizeof(ImDrawIdx),
@@ -412,7 +413,7 @@ void ImGui_ImplWGPU_RenderDrawData(ImDrawData* draw_data, WGPURenderPassEncoder
         for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
         {
             const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
-            if (pcmd->UserCallback != NULL)
+            if (pcmd->UserCallback != nullptr)
             {
                 // User callback, registered via ImDrawList::AddCallback()
                 // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
@@ -429,13 +430,13 @@ void ImGui_ImplWGPU_RenderDrawData(ImDrawData* draw_data, WGPURenderPassEncoder
                 auto bind_group = g_resources.ImageBindGroups.GetVoidPtr(tex_id_hash);
                 if (bind_group)
                 {
-                    wgpuRenderPassEncoderSetBindGroup(pass_encoder, 1, (WGPUBindGroup)bind_group, 0, NULL);
+                    wgpuRenderPassEncoderSetBindGroup(pass_encoder, 1, (WGPUBindGroup)bind_group, 0, nullptr);
                 }
                 else
                 {
                     WGPUBindGroup image_bind_group = ImGui_ImplWGPU_CreateImageBindGroup(g_resources.ImageBindGroupLayout, (WGPUTextureView)tex_id);
                     g_resources.ImageBindGroups.SetVoidPtr(tex_id_hash, image_bind_group);
-                    wgpuRenderPassEncoderSetBindGroup(pass_encoder, 1, image_bind_group, 0, NULL);
+                    wgpuRenderPassEncoderSetBindGroup(pass_encoder, 1, image_bind_group, 0, nullptr);
                 }
 
                 // Project scissor/clipping rectangles into framebuffer space
@@ -525,7 +526,7 @@ static void ImGui_ImplWGPU_CreateUniformBuffer()
 {
     WGPUBufferDescriptor ub_desc =
     {
-        NULL,
+        nullptr,
         "Dear ImGui Uniform buffer",
         WGPUBufferUsage_CopyDst | WGPUBufferUsage_Uniform,
         sizeof(Uniforms),
@@ -651,7 +652,7 @@ void ImGui_ImplWGPU_InvalidateDeviceObjects()
     SafeRelease(g_resources);
 
     ImGuiIO& io = ImGui::GetIO();
-    io.Fonts->SetTexID(NULL); // We copied g_pFontTextureView to io.Fonts->TexID so let's clear that as well.
+    io.Fonts->SetTexID(0); // We copied g_pFontTextureView to io.Fonts->TexID so let's clear that as well.
 
     for (unsigned int i = 0; i < g_numFramesInFlight; i++)
         SafeRelease(g_pFrameResources[i]);
@@ -671,23 +672,23 @@ bool ImGui_ImplWGPU_Init(WGPUDevice device, int num_frames_in_flight, WGPUTextur
     g_numFramesInFlight = num_frames_in_flight;
     g_frameIndex = UINT_MAX;
 
-    g_resources.FontTexture = NULL;
-    g_resources.FontTextureView = NULL;
-    g_resources.Sampler = NULL;
-    g_resources.Uniforms = NULL;
-    g_resources.CommonBindGroup = NULL;
+    g_resources.FontTexture = nullptr;
+    g_resources.FontTextureView = nullptr;
+    g_resources.Sampler = nullptr;
+    g_resources.Uniforms = nullptr;
+    g_resources.CommonBindGroup = nullptr;
     g_resources.ImageBindGroups.Data.reserve(100);
-    g_resources.ImageBindGroup = NULL;
-    g_resources.ImageBindGroupLayout = NULL;
+    g_resources.ImageBindGroup = nullptr;
+    g_resources.ImageBindGroupLayout = nullptr;
 
     // Create buffers with a default size (they will later be grown as needed)
     for (int i = 0; i < num_frames_in_flight; i++)
     {
         FrameResources* fr = &g_pFrameResources[i];
-        fr->IndexBuffer = NULL;
-        fr->VertexBuffer = NULL;
-        fr->IndexBufferHost = NULL;
-        fr->VertexBufferHost = NULL;
+        fr->IndexBuffer = nullptr;
+        fr->VertexBuffer = nullptr;
+        fr->IndexBufferHost = nullptr;
+        fr->VertexBufferHost = nullptr;
         fr->IndexBufferSize = 10000;
         fr->VertexBufferSize = 5000;
     }
@@ -699,9 +700,9 @@ void ImGui_ImplWGPU_Shutdown()
 {
     ImGui_ImplWGPU_InvalidateDeviceObjects();
     delete[] g_pFrameResources;
-    g_pFrameResources = NULL;
+    g_pFrameResources = nullptr;
     wgpuQueueRelease(g_defaultQueue);
-    g_wgpuDevice = NULL;
+    g_wgpuDevice = nullptr;
     g_numFramesInFlight = 0;
     g_frameIndex = UINT_MAX;
 }

backends/imgui_impl_win32.cpp

@@ -36,6 +36,7 @@ typedef DWORD (WINAPI *PFN_XInputGetState)(DWORD, XINPUT_STATE*);
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
 //  2022-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2022-10-11: Using 'nullptr' instead of 'NULL' as per our switch to C++11.
 //  2022-09-28: Inputs: Convert WM_CHAR values with MultiByteToWideChar() when window class was registered as MBCS (not Unicode).
 //  2022-09-26: Inputs: Renamed ImGuiKey_ModXXX introduced in 1.87 to ImGuiMod_XXX (old names still supported).
 //  2022-01-26: Inputs: replaced short-lived io.AddKeyModsEvent() (added two weeks ago) with io.AddKeyEvent() using ImGuiKey_ModXXX flags. Sorry for the confusion.
@@ -78,7 +79,7 @@ typedef DWORD (WINAPI *PFN_XInputGetState)(DWORD, XINPUT_STATE*);
 //  2018-01-05: Inputs: Added WM_LBUTTONDBLCLK double-click handlers for window classes with the CS_DBLCLKS flag.
 //  2017-10-23: Inputs: Added WM_SYSKEYDOWN / WM_SYSKEYUP handlers so e.g. the VK_MENU key can be read.
 //  2017-10-23: Inputs: Using Win32 ::SetCapture/::GetCapture() to retrieve mouse positions outside the client area when dragging.
-//  2016-11-12: Inputs: Only call Win32 ::SetCursor(NULL) when io.MouseDrawCursor is set.
+//  2016-11-12: Inputs: Only call Win32 ::SetCursor(nullptr) when io.MouseDrawCursor is set.
 
 // Forward Declarations
 static void ImGui_ImplWin32_InitPlatformInterface();
@@ -113,14 +114,14 @@ struct ImGui_ImplWin32_Data
 // FIXME: some shared resources (mouse cursor shape, gamepad) are mishandled when using multi-context.
 static ImGui_ImplWin32_Data* ImGui_ImplWin32_GetBackendData()
 {
-    return ImGui::GetCurrentContext() ? (ImGui_ImplWin32_Data*)ImGui::GetIO().BackendPlatformUserData : NULL;
+    return ImGui::GetCurrentContext() ? (ImGui_ImplWin32_Data*)ImGui::GetIO().BackendPlatformUserData : nullptr;
 }
 
 // Functions
 bool    ImGui_ImplWin32_Init(void* hwnd)
 {
     ImGuiIO& io = ImGui::GetIO();
-    IM_ASSERT(io.BackendPlatformUserData == NULL && "Already initialized a platform backend!");
+    IM_ASSERT(io.BackendPlatformUserData == nullptr && "Already initialized a platform backend!");
 
     INT64 perf_frequency, perf_counter;
     if (!::QueryPerformanceFrequency((LARGE_INTEGER*)&perf_frequency))
@@ -176,7 +177,7 @@ bool    ImGui_ImplWin32_Init(void* hwnd)
 void    ImGui_ImplWin32_Shutdown()
 {
     ImGui_ImplWin32_Data* bd = ImGui_ImplWin32_GetBackendData();
-    IM_ASSERT(bd != NULL && "No platform backend to shutdown, or already shutdown?");
+    IM_ASSERT(bd != nullptr && "No platform backend to shutdown, or already shutdown?");
     ImGuiIO& io = ImGui::GetIO();
 
     ImGui_ImplWin32_ShutdownPlatformInterface();
@@ -187,8 +188,8 @@ void    ImGui_ImplWin32_Shutdown()
         ::FreeLibrary(bd->XInputDLL);
 #endif // IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
 
-    io.BackendPlatformName = NULL;
-    io.BackendPlatformUserData = NULL;
+    io.BackendPlatformName = nullptr;
+    io.BackendPlatformUserData = nullptr;
     IM_DELETE(bd);
 }
 
@@ -202,7 +203,7 @@ static bool ImGui_ImplWin32_UpdateMouseCursor()
     if (imgui_cursor == ImGuiMouseCursor_None || io.MouseDrawCursor)
     {
         // Hide OS mouse cursor if imgui is drawing it or if it wants no cursor
-        ::SetCursor(NULL);
+        ::SetCursor(nullptr);
     }
     else
     {
@@ -220,7 +221,7 @@ static bool ImGui_ImplWin32_UpdateMouseCursor()
         case ImGuiMouseCursor_Hand:         win32_cursor = IDC_HAND; break;
         case ImGuiMouseCursor_NotAllowed:   win32_cursor = IDC_NO; break;
         }
-        ::SetCursor(::LoadCursor(NULL, win32_cursor));
+        ::SetCursor(::LoadCursor(nullptr, win32_cursor));
     }
     return true;
 }
@@ -337,7 +338,7 @@ static void ImGui_ImplWin32_UpdateGamepads()
     io.BackendFlags &= ~ImGuiBackendFlags_HasGamepad;
     XINPUT_STATE xinput_state;
     XINPUT_GAMEPAD& gamepad = xinput_state.Gamepad;
-    if (!bd->HasGamepad || bd->XInputGetState == NULL || bd->XInputGetState(0, &xinput_state) != ERROR_SUCCESS)
+    if (!bd->HasGamepad || bd->XInputGetState == nullptr || bd->XInputGetState(0, &xinput_state) != ERROR_SUCCESS)
         return;
     io.BackendFlags |= ImGuiBackendFlags_HasGamepad;
 
@@ -397,7 +398,7 @@ static void ImGui_ImplWin32_UpdateMonitors()
 {
     ImGui_ImplWin32_Data* bd = ImGui_ImplWin32_GetBackendData();
     ImGui::GetPlatformIO().Monitors.resize(0);
-    ::EnumDisplayMonitors(NULL, NULL, ImGui_ImplWin32_UpdateMonitors_EnumFunc, 0);
+    ::EnumDisplayMonitors(nullptr, nullptr, ImGui_ImplWin32_UpdateMonitors_EnumFunc, 0);
     bd->WantUpdateMonitors = false;
 }
 
@@ -405,7 +406,7 @@ void    ImGui_ImplWin32_NewFrame()
 {
     ImGuiIO& io = ImGui::GetIO();
     ImGui_ImplWin32_Data* bd = ImGui_ImplWin32_GetBackendData();
-    IM_ASSERT(bd != NULL && "Did you call ImGui_ImplWin32_Init()?");
+    IM_ASSERT(bd != nullptr && "Did you call ImGui_ImplWin32_Init()?");
 
     // Setup display size (every frame to accommodate for window resizing)
     RECT rect = { 0, 0, 0, 0 };
@@ -576,7 +577,7 @@ extern IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hWnd, UINT msg
 #endif
 IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 {
-    if (ImGui::GetCurrentContext() == NULL)
+    if (ImGui::GetCurrentContext() == nullptr)
         return 0;
 
     ImGuiIO& io = ImGui::GetIO();
@@ -602,7 +603,7 @@ IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hwnd, UINT msg, WPARA
     }
     case WM_MOUSELEAVE:
         if (bd->MouseHwnd == hwnd)
-            bd->MouseHwnd = NULL;
+            bd->MouseHwnd = nullptr;
         bd->MouseTracked = false;
         io.AddMousePosEvent(-FLT_MAX, -FLT_MAX);
         break;
@@ -616,7 +617,7 @@ IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hwnd, UINT msg, WPARA
         if (msg == WM_RBUTTONDOWN || msg == WM_RBUTTONDBLCLK) { button = 1; }
         if (msg == WM_MBUTTONDOWN || msg == WM_MBUTTONDBLCLK) { button = 2; }
         if (msg == WM_XBUTTONDOWN || msg == WM_XBUTTONDBLCLK) { button = (GET_XBUTTON_WPARAM(wParam) == XBUTTON1) ? 3 : 4; }
-        if (bd->MouseButtonsDown == 0 && ::GetCapture() == NULL)
+        if (bd->MouseButtonsDown == 0 && ::GetCapture() == nullptr)
             ::SetCapture(hwnd);
         bd->MouseButtonsDown |= 1 << button;
         io.AddMouseButtonEvent(button, true);
@@ -741,11 +742,11 @@ IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hwnd, UINT msg, WPARA
 static BOOL _IsWindowsVersionOrGreater(WORD major, WORD minor, WORD)
 {
     typedef LONG(WINAPI* PFN_RtlVerifyVersionInfo)(OSVERSIONINFOEXW*, ULONG, ULONGLONG);
-    static PFN_RtlVerifyVersionInfo RtlVerifyVersionInfoFn = NULL;
-	if (RtlVerifyVersionInfoFn == NULL)
+    static PFN_RtlVerifyVersionInfo RtlVerifyVersionInfoFn = nullptr;
+	if (RtlVerifyVersionInfoFn == nullptr)
 		if (HMODULE ntdllModule = ::GetModuleHandleA("ntdll.dll"))
 			RtlVerifyVersionInfoFn = (PFN_RtlVerifyVersionInfo)GetProcAddress(ntdllModule, "RtlVerifyVersionInfo");
-    if (RtlVerifyVersionInfoFn == NULL)
+    if (RtlVerifyVersionInfoFn == nullptr)
         return FALSE;
 
     RTL_OSVERSIONINFOEXW versionInfo = { };
@@ -818,10 +819,10 @@ float ImGui_ImplWin32_GetDpiScaleForMonitor(void* monitor)
     if (_IsWindows8Point1OrGreater())
     {
 		static HINSTANCE shcore_dll = ::LoadLibraryA("shcore.dll"); // Reference counted per-process
-		static PFN_GetDpiForMonitor GetDpiForMonitorFn = NULL;
-		if (GetDpiForMonitorFn == NULL && shcore_dll != NULL)
+		static PFN_GetDpiForMonitor GetDpiForMonitorFn = nullptr;
+		if (GetDpiForMonitorFn == nullptr && shcore_dll != nullptr)
             GetDpiForMonitorFn = (PFN_GetDpiForMonitor)::GetProcAddress(shcore_dll, "GetDpiForMonitor");
-		if (GetDpiForMonitorFn != NULL)
+		if (GetDpiForMonitorFn != nullptr)
 		{
 			GetDpiForMonitorFn((HMONITOR)monitor, MDT_EFFECTIVE_DPI, &xdpi, &ydpi);
             IM_ASSERT(xdpi == ydpi); // Please contact me if you hit this assert!
@@ -829,11 +830,11 @@ float ImGui_ImplWin32_GetDpiScaleForMonitor(void* monitor)
 		}
     }
 #ifndef NOGDI
-    const HDC dc = ::GetDC(NULL);
+    const HDC dc = ::GetDC(nullptr);
     xdpi = ::GetDeviceCaps(dc, LOGPIXELSX);
     ydpi = ::GetDeviceCaps(dc, LOGPIXELSY);
     IM_ASSERT(xdpi == ydpi); // Please contact me if you hit this assert!
-    ::ReleaseDC(NULL, dc);
+    ::ReleaseDC(nullptr, dc);
 #endif
     return xdpi / 96.0f;
 }
@@ -858,8 +859,8 @@ struct ImGui_ImplWin32_ViewportData
     DWORD   DwStyle;
     DWORD   DwExStyle;
 
-    ImGui_ImplWin32_ViewportData() { Hwnd = NULL; HwndOwned = false;  DwStyle = DwExStyle = 0; }
-    ~ImGui_ImplWin32_ViewportData() { IM_ASSERT(Hwnd == NULL); }
+    ImGui_ImplWin32_ViewportData() { Hwnd = nullptr; HwndOwned = false;  DwStyle = DwExStyle = 0; }
+    ~ImGui_ImplWin32_ViewportData() { IM_ASSERT(Hwnd == nullptr); }
 };
 
 static void ImGui_ImplWin32_GetWin32StyleFromViewportFlags(ImGuiViewportFlags flags, DWORD* out_style, DWORD* out_ex_style)
@@ -885,7 +886,7 @@ static void ImGui_ImplWin32_CreateWindow(ImGuiViewport* viewport)
 
     // Select style and parent window
     ImGui_ImplWin32_GetWin32StyleFromViewportFlags(viewport->Flags, &vd->DwStyle, &vd->DwExStyle);
-    HWND parent_window = NULL;
+    HWND parent_window = nullptr;
     if (viewport->ParentViewportId != 0)
         if (ImGuiViewport* parent_viewport = ImGui::FindViewportByID(viewport->ParentViewportId))
             parent_window = (HWND)parent_viewport->PlatformHandle;
@@ -894,9 +895,9 @@ static void ImGui_ImplWin32_CreateWindow(ImGuiViewport* viewport)
     RECT rect = { (LONG)viewport->Pos.x, (LONG)viewport->Pos.y, (LONG)(viewport->Pos.x + viewport->Size.x), (LONG)(viewport->Pos.y + viewport->Size.y) };
     ::AdjustWindowRectEx(&rect, vd->DwStyle, FALSE, vd->DwExStyle);
     vd->Hwnd = ::CreateWindowEx(
-        vd->DwExStyle, _T("ImGui Platform"), _T("Untitled"), vd->DwStyle,   // Style, class name, window name
+        vd->DwExStyle, _T("ImGui Platform"), _T("Untitled"), vd->DwStyle,       // Style, class name, window name
         rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top,    // Window area
-        parent_window, NULL, ::GetModuleHandle(NULL), NULL);                    // Parent window, Menu, Instance, Param
+        parent_window, nullptr, ::GetModuleHandle(nullptr), nullptr);           // Parent window, Menu, Instance, Param
     vd->HwndOwned = true;
     viewport->PlatformRequestResize = false;
     viewport->PlatformHandle = viewport->PlatformHandleRaw = vd->Hwnd;
@@ -915,10 +916,10 @@ static void ImGui_ImplWin32_DestroyWindow(ImGuiViewport* viewport)
         }
         if (vd->Hwnd && vd->HwndOwned)
             ::DestroyWindow(vd->Hwnd);
-        vd->Hwnd = NULL;
+        vd->Hwnd = nullptr;
         IM_DELETE(vd);
     }
-    viewport->PlatformUserData = viewport->PlatformHandle = NULL;
+    viewport->PlatformUserData = viewport->PlatformHandle = nullptr;
 }
 
 static void ImGui_ImplWin32_ShowWindow(ImGuiViewport* viewport)
@@ -995,7 +996,7 @@ static void ImGui_ImplWin32_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
     IM_ASSERT(vd->Hwnd != 0);
     RECT rect = { 0, 0, (LONG)size.x, (LONG)size.y };
     ::AdjustWindowRectEx(&rect, vd->DwStyle, FALSE, vd->DwExStyle); // Client to Screen
-    ::SetWindowPos(vd->Hwnd, NULL, 0, 0, rect.right - rect.left, rect.bottom - rect.top, SWP_NOZORDER | SWP_NOMOVE | SWP_NOACTIVATE);
+    ::SetWindowPos(vd->Hwnd, nullptr, 0, 0, rect.right - rect.left, rect.bottom - rect.top, SWP_NOZORDER | SWP_NOMOVE | SWP_NOACTIVATE);
 }
 
 static void ImGui_ImplWin32_SetWindowFocus(ImGuiViewport* viewport)
@@ -1026,7 +1027,7 @@ static void ImGui_ImplWin32_SetWindowTitle(ImGuiViewport* viewport, const char*
     // ::SetWindowTextA() doesn't properly handle UTF-8 so we explicitely convert our string.
     ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
     IM_ASSERT(vd->Hwnd != 0);
-    int n = ::MultiByteToWideChar(CP_UTF8, 0, title, -1, NULL, 0);
+    int n = ::MultiByteToWideChar(CP_UTF8, 0, title, -1, nullptr, 0);
     ImVector<wchar_t> title_w;
     title_w.resize(n);
     ::MultiByteToWideChar(CP_UTF8, 0, title, -1, title_w.Data, n);
@@ -1118,13 +1119,13 @@ static void ImGui_ImplWin32_InitPlatformInterface()
     wcex.lpfnWndProc = ImGui_ImplWin32_WndProcHandler_PlatformWindow;
     wcex.cbClsExtra = 0;
     wcex.cbWndExtra = 0;
-    wcex.hInstance = ::GetModuleHandle(NULL);
-    wcex.hIcon = NULL;
-    wcex.hCursor = NULL;
+    wcex.hInstance = ::GetModuleHandle(nullptr);
+    wcex.hIcon = nullptr;
+    wcex.hCursor = nullptr;
     wcex.hbrBackground = (HBRUSH)(COLOR_BACKGROUND + 1);
-    wcex.lpszMenuName = NULL;
+    wcex.lpszMenuName = nullptr;
     wcex.lpszClassName = _T("ImGui Platform");
-    wcex.hIconSm = NULL;
+    wcex.hIconSm = nullptr;
     ::RegisterClassEx(&wcex);
 
     ImGui_ImplWin32_UpdateMonitors();
@@ -1160,7 +1161,7 @@ static void ImGui_ImplWin32_InitPlatformInterface()
 
 static void ImGui_ImplWin32_ShutdownPlatformInterface()
 {
-    ::UnregisterClass(_T("ImGui Platform"), ::GetModuleHandle(NULL));
+    ::UnregisterClass(_T("ImGui Platform"), ::GetModuleHandle(nullptr));
     ImGui::DestroyPlatformWindows();
 }
 

docs/CHANGELOG.txt

@@ -170,6 +170,10 @@ Other Changes:
 - Popups & Modals: fixed nested Begin() being erroneously input-inhibited. While it is
   unusual, you can nest a Begin() inside a popup or modal, it is occasionally useful to
   achieve certains things (e.g. some ways to implement suggestion popup #718, #4461).
+- Scrolling: Tweak mouse-wheel locked window timer so it is shorter but also gets reset
+  whenever scrolling again (#2604).
+- Scrolling: Mitigated issue where multi-axis mouse-wheel inputs (usually from touch pad
+  events) are incorrectly locking scrolling in a parent window. (#4559, #3795, #2604)
 - InputText: added experimental io.ConfigInputTextEnterKeepActive feature to make pressing
   Enter keep the input active and select all text.
 - InputText: numerical fields automatically accept full-width characters (U+FF01..U+FF5E)
@@ -215,6 +219,7 @@ Other Changes:
   which would result in an abnormal number of vertices created (was slower and more likely to
   asserts with 16-bits ImDrawVtx). (#5720)
 - Fonts: Added GetGlyphRangesGreek() helper for Greek & Coptic glyph range. (#5676, #5727) [@azonenberg]
+- ImDrawList: Not using alloca() anymore, lift single polygon size limits. (#5704, #1811)
 - Platform IME: [Windows] Removed call to ImmAssociateContextEx() leading to freeze on some setups.
   (#2589, #5535, #5264, #4972)
 - Misc: ImGuiKey is now a typed enum, allowing ImGuiKey_XXX symbols to be named in debuggers. (#4921)
@@ -237,6 +242,8 @@ Other Changes:
 - Backends: Metal: Use __bridge for ARC based systems. (#5403) [@stack]
 - Backends: Metal: Add dispatch synchronization. (#5447) [@luigifcruz]
 - Backends: Metal: Update deprecated property 'sampleCount'->'rasterSampleCount'. (#5603) [@dcvz]
+- Backends: Vulkan: Added experimental ImGui_ImplVulkan_RemoveTexture() for api symetry. (#914, #5738).
+- Backends: OSX: Fixed mouse inputs on flipped views. (#5756) [@Nemirtingas]
 - Backends: OSX: Fixes to support full app creation in C++. (#5403) [@stack]
 
 Docking+Viewports Branch:

imgui.cpp

@@ -961,7 +961,7 @@ static const float NAV_WINDOWING_LIST_APPEAR_DELAY          = 0.15f;    // Time
 // Window resizing from edges (when io.ConfigWindowsResizeFromEdges = true and ImGuiBackendFlags_HasMouseCursors is set in io.BackendFlags by backend)
 static const float WINDOWS_HOVER_PADDING                    = 4.0f;     // Extend outside window for hovering/resizing (maxxed with TouchPadding) and inside windows for borders. Affect FindHoveredWindow().
 static const float WINDOWS_RESIZE_FROM_EDGES_FEEDBACK_TIMER = 0.04f;    // Reduce visual noise by only highlighting the border after a certain time.
-static const float WINDOWS_MOUSE_WHEEL_SCROLL_LOCK_TIMER    = 2.00f;    // Lock scrolled window (so it doesn't pick child windows that are scrolling through) for a certain time, unless mouse moved.
+static const float WINDOWS_MOUSE_WHEEL_SCROLL_LOCK_TIMER    = 0.80f;    // Lock scrolled window (so it doesn't pick child windows that are scrolling through) for a certain time, unless mouse moved.
 
 // Docking
 static const float DOCKING_TRANSPARENT_PAYLOAD_ALPHA        = 0.50f;    // For use with io.ConfigDockingTransparentPayload. Apply to Viewport _or_ WindowBg in host viewport.
@@ -4433,15 +4433,15 @@ static void ImGui::UpdateMouseInputs()
     }
 }
 
-static void StartLockWheelingWindow(ImGuiWindow* window)
+static void LockWheelingWindow(ImGuiWindow* window)
 {
     ImGuiContext& g = *GImGui;
+    g.WheelingWindowReleaseTimer = window ? WINDOWS_MOUSE_WHEEL_SCROLL_LOCK_TIMER : 0.0f;
     if (g.WheelingWindow == window)
         return;
-    IMGUI_DEBUG_LOG_IO("StartLockWheelingWindow() \"%s\"\n", window ? window->Name : "NULL");
+    IMGUI_DEBUG_LOG_IO("LockWheelingWindow() \"%s\"\n", window ? window->Name : "NULL");
     g.WheelingWindow = window;
     g.WheelingWindowRefMousePos = g.IO.MousePos;
-    g.WheelingWindowTimer = WINDOWS_MOUSE_WHEEL_SCROLL_LOCK_TIMER;
 }
 
 void ImGui::UpdateMouseWheel()
@@ -4451,35 +4451,34 @@ void ImGui::UpdateMouseWheel()
     // Reset the locked window if we move the mouse or after the timer elapses
     if (g.WheelingWindow != NULL)
     {
-        g.WheelingWindowTimer -= g.IO.DeltaTime;
+        g.WheelingWindowReleaseTimer -= g.IO.DeltaTime;
         if (IsMousePosValid() && ImLengthSqr(g.IO.MousePos - g.WheelingWindowRefMousePos) > g.IO.MouseDragThreshold * g.IO.MouseDragThreshold)
-            g.WheelingWindowTimer = 0.0f;
-        if (g.WheelingWindowTimer <= 0.0f)
-        {
-            IMGUI_DEBUG_LOG_IO("UpdateMouseWheel() release WheelingWindow lock \"%s\"\n", g.WheelingWindow->Name);
-            g.WheelingWindow = NULL;
-            g.WheelingWindowTimer = 0.0f;
-        }
+            g.WheelingWindowReleaseTimer = 0.0f;
+        if (g.WheelingWindowReleaseTimer <= 0.0f)
+            LockWheelingWindow(NULL);
     }
 
     const bool hovered_id_using_mouse_wheel = (g.HoveredIdPreviousFrame != 0 && g.HoveredIdPreviousFrameUsingMouseWheel);
     const bool active_id_using_mouse_wheel_x = g.ActiveIdUsingKeyInputMask.TestBit(ImGuiKey_MouseWheelX);
     const bool active_id_using_mouse_wheel_y = g.ActiveIdUsingKeyInputMask.TestBit(ImGuiKey_MouseWheelY);
 
-    float wheel_x = (!hovered_id_using_mouse_wheel && !active_id_using_mouse_wheel_x) ? g.IO.MouseWheelH : 0.0f;
-    float wheel_y = (!hovered_id_using_mouse_wheel && !active_id_using_mouse_wheel_y) ? g.IO.MouseWheel : 0;
-    if (wheel_x == 0.0f && wheel_y == 0.0f)
+    ImVec2 wheel;
+    wheel.x = (!hovered_id_using_mouse_wheel && !active_id_using_mouse_wheel_x) ? g.IO.MouseWheelH : 0.0f;
+    wheel.y = (!hovered_id_using_mouse_wheel && !active_id_using_mouse_wheel_y) ? g.IO.MouseWheel : 0;
+    if (wheel.x == 0.0f && wheel.y == 0.0f)
         return;
 
-    ImGuiWindow* window = g.WheelingWindow ? g.WheelingWindow : g.HoveredWindow;
-    if (!window || window->Collapsed)
+    //IMGUI_DEBUG_LOG("MouseWheel X:%.3f Y:%.3f\n", wheel_x, wheel_y);
+    ImGuiWindow* mouse_window = g.WheelingWindow ? g.WheelingWindow : g.HoveredWindow;
+    if (!mouse_window || mouse_window->Collapsed)
         return;
 
     // Zoom / Scale window
     // FIXME-OBSOLETE: This is an old feature, it still works but pretty much nobody is using it and may be best redesigned.
-    if (wheel_y != 0.0f && g.IO.KeyCtrl && g.IO.FontAllowUserScaling)
+    if (wheel.y != 0.0f && g.IO.KeyCtrl && g.IO.FontAllowUserScaling)
     {
-        StartLockWheelingWindow(window);
+        LockWheelingWindow(mouse_window);
+        ImGuiWindow* window = mouse_window;
         const float new_font_scale = ImClamp(window->FontWindowScale + g.IO.MouseWheel * 0.10f, 0.50f, 2.50f);
         const float scale = new_font_scale / window->FontWindowScale;
         window->FontWindowScale = new_font_scale;
@@ -4492,46 +4491,50 @@ void ImGui::UpdateMouseWheel()
         }
         return;
     }
-
-    // Mouse wheel scrolling
-    // If a child window has the ImGuiWindowFlags_NoScrollWithMouse flag, we give a chance to scroll its parent
     if (g.IO.KeyCtrl)
         return;
 
+    // Mouse wheel scrolling
     // As a standard behavior holding SHIFT while using Vertical Mouse Wheel triggers Horizontal scroll instead
     // (we avoid doing it on OSX as it the OS input layer handles this already)
     const bool swap_axis = g.IO.KeyShift && !g.IO.ConfigMacOSXBehaviors;
     if (swap_axis)
     {
-        wheel_x = wheel_y;
-        wheel_y = 0.0f;
+        wheel.x = wheel.y;
+        wheel.y = 0.0f;
     }
 
     // Vertical Mouse Wheel scrolling
-    if (wheel_y != 0.0f)
+    // Bubble up into parent window if:
+    // - a child window doesn't allow any scrolling.
+    // - a child window doesn't need scrolling because it is already at the edge for the direction we are going in.
+    // - a child window has the ImGuiWindowFlags_NoScrollWithMouse flag.
+    if (wheel.y != 0.0f)
     {
-        StartLockWheelingWindow(window);
+        ImGuiWindow* window = mouse_window;
         while ((window->Flags & ImGuiWindowFlags_ChildWindow) && ((window->ScrollMax.y == 0.0f) || ((window->Flags & ImGuiWindowFlags_NoScrollWithMouse) && !(window->Flags & ImGuiWindowFlags_NoMouseInputs))))
             window = window->ParentWindow;
         if (!(window->Flags & ImGuiWindowFlags_NoScrollWithMouse) && !(window->Flags & ImGuiWindowFlags_NoMouseInputs))
         {
+            LockWheelingWindow(mouse_window);
             float max_step = window->InnerRect.GetHeight() * 0.67f;
             float scroll_step = ImFloor(ImMin(5 * window->CalcFontSize(), max_step));
-            SetScrollY(window, window->Scroll.y - wheel_y * scroll_step);
+            SetScrollY(window, window->Scroll.y - wheel.y * scroll_step);
         }
     }
 
     // Horizontal Mouse Wheel scrolling, or Vertical Mouse Wheel w/ Shift held
-    if (wheel_x != 0.0f)
+    if (wheel.x != 0.0f)
     {
-        StartLockWheelingWindow(window);
+        ImGuiWindow* window = mouse_window;
         while ((window->Flags & ImGuiWindowFlags_ChildWindow) && ((window->ScrollMax.x == 0.0f) || ((window->Flags & ImGuiWindowFlags_NoScrollWithMouse) && !(window->Flags & ImGuiWindowFlags_NoMouseInputs))))
             window = window->ParentWindow;
         if (!(window->Flags & ImGuiWindowFlags_NoScrollWithMouse) && !(window->Flags & ImGuiWindowFlags_NoMouseInputs))
         {
+            LockWheelingWindow(mouse_window);
             float max_step = window->InnerRect.GetWidth() * 0.67f;
             float scroll_step = ImFloor(ImMin(2 * window->CalcFontSize(), max_step));
-            SetScrollX(window, window->Scroll.x - wheel_x * scroll_step);
+            SetScrollX(window, window->Scroll.x - wheel.x * scroll_step);
         }
     }
 }
@@ -4924,6 +4927,7 @@ void ImGui::Shutdown()
         IM_DELETE(g.IO.Fonts);
     }
     g.IO.Fonts = NULL;
+    g.DrawListSharedData.TempBuffer.clear();
 
     // Cleanup of other data are conditional on actually having initialized Dear ImGui.
     if (!g.Initialized)

imgui.h

@@ -23,7 +23,7 @@
 // Library Version
 // (Integer encoded as XYYZZ for use in #if preprocessor conditionals, e.g. '#if IMGUI_VERSION_NUM > 12345')
 #define IMGUI_VERSION               "1.89 WIP"
-#define IMGUI_VERSION_NUM           18828
+#define IMGUI_VERSION_NUM           18829
 #define IMGUI_HAS_TABLE
 #define IMGUI_HAS_VIEWPORT          // Viewport WIP branch
 #define IMGUI_HAS_DOCK              // Docking WIP branch
@@ -2625,7 +2625,7 @@ struct ImDrawList
 
     // [Internal, used while building lists]
     unsigned int            _VtxCurrentIdx;     // [Internal] generally == VtxBuffer.Size unless we are past 64K vertices, in which case this gets reset to 0.
-    const ImDrawListSharedData* _Data;          // Pointer to shared draw data (you can use ImGui::GetDrawListSharedData() to get the one from current ImGui context)
+    ImDrawListSharedData*   _Data;              // Pointer to shared draw data (you can use ImGui::GetDrawListSharedData() to get the one from current ImGui context)
     const char*             _OwnerName;         // Pointer to owner window's name for debugging
     ImDrawVert*             _VtxWritePtr;       // [Internal] point within VtxBuffer.Data after each add command (to avoid using the ImVector<> operators too much)
     ImDrawIdx*              _IdxWritePtr;       // [Internal] point within IdxBuffer.Data after each add command (to avoid using the ImVector<> operators too much)
@@ -2637,7 +2637,7 @@ struct ImDrawList
     float                   _FringeScale;       // [Internal] anti-alias fringe is scaled by this value, this helps to keep things sharp while zooming at vertex buffer content
 
     // If you want to create ImDrawList instances, pass them ImGui::GetDrawListSharedData() or create and use your own ImDrawListSharedData (so you can use ImDrawList without ImGui)
-    ImDrawList(const ImDrawListSharedData* shared_data) { memset(this, 0, sizeof(*this)); _Data = shared_data; }
+    ImDrawList(ImDrawListSharedData* shared_data) { memset(this, 0, sizeof(*this)); _Data = shared_data; }
 
     ~ImDrawList() { _ClearFreeMemory(); }
     IMGUI_API void  PushClipRect(const ImVec2& clip_rect_min, const ImVec2& clip_rect_max, bool intersect_with_current_clip_rect = false);  // Render-level scissoring. This is passed down to your render function but not used for CPU-side coarse clipping. Prefer using higher-level ImGui::PushClipRect() to affect logic (hit-testing and widget culling)

imgui_draw.cpp

@@ -39,25 +39,12 @@ Index of this file:
 #endif
 
 #include <stdio.h>      // vsnprintf, sscanf, printf
-#if !defined(alloca)
-#if defined(__GLIBC__) || defined(__sun) || defined(__APPLE__) || defined(__NEWLIB__)
-#include <alloca.h>     // alloca (glibc uses <alloca.h>. Note that Cygwin may have _WIN32 defined, so the order matters here)
-#elif defined(_WIN32)
-#include <malloc.h>     // alloca
-#if !defined(alloca)
-#define alloca _alloca  // for clang with MS Codegen
-#endif
-#else
-#include <stdlib.h>     // alloca
-#endif
-#endif
 
 // Visual Studio warnings
 #ifdef _MSC_VER
 #pragma warning (disable: 4127)     // condition expression is constant
 #pragma warning (disable: 4505)     // unreferenced local function has been removed (stb stuff)
 #pragma warning (disable: 4996)     // 'This function or variable may be unsafe': strcpy, strdup, sprintf, vsnprintf, sscanf, fopen
-#pragma warning (disable: 6255)     // [Static Analyzer] _alloca indicates failure by raising a stack overflow exception.  Consider using _malloca instead.
 #pragma warning (disable: 26451)    // [Static Analyzer] Arithmetic overflow : Using operator 'xxx' on a 4 byte value and then casting the result to a 8 byte value. Cast the value to the wider type before calling operator 'xxx' to avoid overflow(io.2).
 #pragma warning (disable: 26812)    // [Static Analyzer] The enum type 'xxx' is unscoped. Prefer 'enum class' over 'enum' (Enum.3). [MSVC Static Analyzer)
 #endif
@@ -67,9 +54,6 @@ Index of this file:
 #if __has_warning("-Wunknown-warning-option")
 #pragma clang diagnostic ignored "-Wunknown-warning-option"         // warning: unknown warning group 'xxx'                      // not all warnings are known by all Clang versions and they tend to be rename-happy.. so ignoring warnings triggers new warnings on some configuration. Great!
 #endif
-#if __has_warning("-Walloca")
-#pragma clang diagnostic ignored "-Walloca"                         // warning: use of function '__builtin_alloca' is discouraged
-#endif
 #pragma clang diagnostic ignored "-Wunknown-pragmas"                // warning: unknown warning group 'xxx'
 #pragma clang diagnostic ignored "-Wold-style-cast"                 // warning: use of old-style cast                            // yes, they are more terse.
 #pragma clang diagnostic ignored "-Wfloat-equal"                    // warning: comparing floating point with == or != is unsafe // storing and comparing against same constants ok.
@@ -761,7 +745,8 @@ void ImDrawList::AddPolyline(const ImVec2* points, const int points_count, ImU32
 
         // Temporary buffer
         // The first <points_count> items are normals at each line point, then after that there are either 2 or 4 temp points for each line point
-        ImVec2* temp_normals = (ImVec2*)alloca(points_count * ((use_texture || !thick_line) ? 3 : 5) * sizeof(ImVec2)); //-V630
+        _Data->TempBuffer.reserve_discard(points_count * ((use_texture || !thick_line) ? 3 : 5));
+        ImVec2* temp_normals = _Data->TempBuffer.Data;
         ImVec2* temp_points = temp_normals + points_count;
 
         // Calculate normals (tangents) for each line segment
@@ -1009,7 +994,8 @@ void ImDrawList::AddConvexPolyFilled(const ImVec2* points, const int points_coun
         }
 
         // Compute normals
-        ImVec2* temp_normals = (ImVec2*)alloca(points_count * sizeof(ImVec2)); //-V630
+        _Data->TempBuffer.reserve_discard(points_count);
+        ImVec2* temp_normals = _Data->TempBuffer.Data;
         for (int i0 = points_count - 1, i1 = 0; i1 < points_count; i0 = i1++)
         {
             const ImVec2& p0 = points[i0];

imgui_internal.h

@@ -744,6 +744,9 @@ struct IMGUI_API ImDrawListSharedData
     ImVec4          ClipRectFullscreen;         // Value for PushClipRectFullscreen()
     ImDrawListFlags InitialFlags;               // Initial flags at the beginning of the frame (it is possible to alter flags on a per-drawlist basis afterwards)
 
+    // [Internal] Temp write buffer
+    ImVector<ImVec2> TempBuffer;
+
     // [Internal] Lookup tables
     ImVec2          ArcFastVtx[IM_DRAWLIST_ARCFAST_TABLE_SIZE]; // Sample points on the quarter of the circle.
     float           ArcFastRadiusCutoff;                        // Cutoff radius after which arc drawing will fallback to slower PathArcTo()
@@ -1811,7 +1814,7 @@ struct ImGuiContext
     ImGuiWindow*            MovingWindow;                       // Track the window we clicked on (in order to preserve focus). The actual window that is moved is generally MovingWindow->RootWindowDockTree.
     ImGuiWindow*            WheelingWindow;                     // Track the window we started mouse-wheeling on. Until a timer elapse or mouse has moved, generally keep scrolling the same window even if during the course of scrolling the mouse ends up hovering a child window.
     ImVec2                  WheelingWindowRefMousePos;
-    float                   WheelingWindowTimer;
+    float                   WheelingWindowReleaseTimer;
 
     // Item/widgets state and tracking information
     ImGuiID                 DebugHookIdInfo;                    // Will call core hooks: DebugHookIdInfo() from GetID functions, used by Stack Tool [next HoveredId/ActiveId to not pull in an extra cache-line]
@@ -2079,7 +2082,7 @@ struct ImGuiContext
         HoveredWindowUnderMovingWindow = NULL;
         MovingWindow = NULL;
         WheelingWindow = NULL;
-        WheelingWindowTimer = 0.0f;
+        WheelingWindowReleaseTimer = 0.0f;
 
         DebugHookIdInfo = 0;
         HoveredId = HoveredIdPreviousFrame = 0;

misc/freetype/imgui_freetype.cpp

@@ -508,7 +508,7 @@ bool ImFontAtlasBuildWithFreeTypeEx(FT_Library ft_library, ImFontAtlas* atlas, u
     // Allocate temporary rasterization data buffers.
     // We could not find a way to retrieve accurate glyph size without rendering them.
     // (e.g. slot->metrics->width not always matching bitmap->width, especially considering the Oblique transform)
-    // We allocate in chunks of 256 KB to not waste too much extra memory ahead. Hopefully users of FreeType won't find the temporary allocations.
+    // We allocate in chunks of 256 KB to not waste too much extra memory ahead. Hopefully users of FreeType won't mind the temporary allocations.
     const int BITMAP_BUFFERS_CHUNK_SIZE = 256 * 1024;
     int buf_bitmap_current_used_bytes = 0;
     ImVector<unsigned char*> buf_bitmap_buffers;
@@ -556,6 +556,7 @@ bool ImFontAtlasBuildWithFreeTypeEx(FT_Library ft_library, ImFontAtlas* atlas, u
                 buf_bitmap_current_used_bytes = 0;
                 buf_bitmap_buffers.push_back((unsigned char*)IM_ALLOC(BITMAP_BUFFERS_CHUNK_SIZE));
             }
+            IM_ASSERT(buf_bitmap_current_used_bytes + bitmap_size_in_bytes <= BITMAP_BUFFERS_CHUNK_SIZE); // We could probably allocate custom-sized buffer instead.
 
             // Blit rasterized pixels to our temporary buffer and keep a pointer to it.
             src_glyph.BitmapData = (unsigned int*)(buf_bitmap_buffers.back() + buf_bitmap_current_used_bytes);