Backends: DX12: let the user specifies the DepthStencilView format. (#8217)

This is particullarly important for those who use RenderPasses.

backends/imgui_impl_dx12.cpp

@@ -19,6 +19,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2024-12-09: DirectX12: Let user specifies the DepthStencilView format by setting ImGui_ImplDX12_InitInfo::DSVFormat. 
 //  2024-11-15: DirectX12: *BREAKING CHANGE* Changed ImGui_ImplDX12_Init() signature to take a ImGui_ImplDX12_InitInfo struct. Legacy ImGui_ImplDX12_Init() signature is still supported (will obsolete).
 //  2024-11-15: DirectX12: *BREAKING CHANGE* User is now required to pass function pointers to allocate/free SRV Descriptors. We provide convenience legacy fields to pass a single descriptor, matching the old API, but upcoming features will want multiple.
 //  2024-10-23: DirectX12: Unmap() call specify written range. The range is informational and may be used by debug tools.
@@ -72,6 +73,7 @@ struct ImGui_ImplDX12_Data
     ID3D12RootSignature*        pRootSignature;
     ID3D12PipelineState*        pPipelineState;
     DXGI_FORMAT                 RTVFormat;
+    DXGI_FORMAT                 DSVFormat;
     ID3D12DescriptorHeap*       pd3dSrvDescHeap;
     UINT                        numFramesInFlight;
 
@@ -569,6 +571,7 @@ bool    ImGui_ImplDX12_CreateDeviceObjects()
     psoDesc.SampleMask = UINT_MAX;
     psoDesc.NumRenderTargets = 1;
     psoDesc.RTVFormats[0] = bd->RTVFormat;
+    psoDesc.DSVFormat = bd->DSVFormat;
     psoDesc.SampleDesc.Count = 1;
     psoDesc.Flags = D3D12_PIPELINE_STATE_FLAG_NONE;
 
@@ -735,6 +738,7 @@ bool ImGui_ImplDX12_Init(ImGui_ImplDX12_InitInfo* init_info)
 
     bd->pd3dDevice = init_info->Device;
     bd->RTVFormat = init_info->RTVFormat;
+    bd->DSVFormat = init_info->DSVFormat;
     bd->numFramesInFlight = init_info->NumFramesInFlight;
     bd->pd3dSrvDescHeap = init_info->SrvDescriptorHeap;
 

backends/imgui_impl_dx12.h

@@ -29,7 +29,8 @@ struct ImGui_ImplDX12_InitInfo
     ID3D12Device*               Device;
     ID3D12CommandQueue*         CommandQueue;
     int                         NumFramesInFlight;
-    DXGI_FORMAT                 RTVFormat;
+    DXGI_FORMAT                 RTVFormat;          // RenderTarget format.
+    DXGI_FORMAT                 DSVFormat;          // DepthStencilView format.
     void*                       UserData;
 
     // Allocating SRV descriptors for textures is up to the application, so we provide callbacks.

docs/CHANGELOG.txt

@@ -67,6 +67,8 @@ Other changes:
 - Fonts: fixed AddCustomRect() not being packed with TexGlyphPadding + not accounted
   for surface area used to determine best-guess texture size. (#8107) [@YarikTH, @ocornut]
 - Misc: use SSE 4.2 crc32 instructions when available. (#8169, #4933) [@Teselka]
+- Backends: DirectX12: Let user specifies the DepthStencilView format by setting 
+  ImGui_ImplDX12_InitInfo::DSVFormat. (#8217) [@bmarques1995]
 - Backends: Vulkan: Make user-provided descriptor pool optional. As a convenience,
   when setting init_info->DescriptorPoolSize then the backend will create and manage
   one itself. (#8172, #4867) [@zeux]

examples/example_win32_directx12/main.cpp

@@ -146,6 +146,7 @@ int main(int, char**)
     init_info.CommandQueue = g_pd3dCommandQueue;
     init_info.NumFramesInFlight = APP_NUM_FRAMES_IN_FLIGHT;
     init_info.RTVFormat = DXGI_FORMAT_R8G8B8A8_UNORM;
+    init_info.DSVFormat = DXGI_FORMAT_UNKNOWN;
     // Allocating SRV descriptors (for textures) is up to the application, so we provide callbacks.
     // (current version of the backend will only allocate one descriptor, future versions will need to allocate more)
     init_info.SrvDescriptorHeap = g_pd3dSrvDescHeap;