Backends: Fixed early out on empty clip rect. In particular, DX12 backend would warn about it (others not so much). (#4775, #4464)

Amend/fix 2b0bd40b

backends/imgui_impl_allegro5.cpp

@@ -174,7 +174,7 @@ void ImGui_ImplAllegro5_RenderDrawData(ImDrawData* draw_data)
                 // Project scissor/clipping rectangles into framebuffer space
                 ImVec2 clip_min(pcmd->ClipRect.x - clip_off.x, pcmd->ClipRect.y - clip_off.y);
                 ImVec2 clip_max(pcmd->ClipRect.z - clip_off.x, pcmd->ClipRect.w - clip_off.y);
-                if (clip_max.x < clip_min.x || clip_max.y < clip_min.y)
+                if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
                     continue;
 
                 // Apply scissor/clipping rectangle, Draw

backends/imgui_impl_dx10.cpp

@@ -256,7 +256,7 @@ void ImGui_ImplDX10_RenderDrawData(ImDrawData* draw_data)
                 // Project scissor/clipping rectangles into framebuffer space
                 ImVec2 clip_min(pcmd->ClipRect.x - clip_off.x, pcmd->ClipRect.y - clip_off.y);
                 ImVec2 clip_max(pcmd->ClipRect.z - clip_off.x, pcmd->ClipRect.w - clip_off.y);
-                if (clip_max.x < clip_min.x || clip_max.y < clip_min.y)
+                if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
                     continue;
 
                 // Apply scissor/clipping rectangle

backends/imgui_impl_dx11.cpp

@@ -266,7 +266,7 @@ void ImGui_ImplDX11_RenderDrawData(ImDrawData* draw_data)
                 // Project scissor/clipping rectangles into framebuffer space
                 ImVec2 clip_min(pcmd->ClipRect.x - clip_off.x, pcmd->ClipRect.y - clip_off.y);
                 ImVec2 clip_max(pcmd->ClipRect.z - clip_off.x, pcmd->ClipRect.w - clip_off.y);
-                if (clip_max.x < clip_min.x || clip_max.y < clip_min.y)
+                if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
                     continue;
 
                 // Apply scissor/clipping rectangle

backends/imgui_impl_dx12.cpp

@@ -262,7 +262,7 @@ void ImGui_ImplDX12_RenderDrawData(ImDrawData* draw_data, ID3D12GraphicsCommandL
                 // Project scissor/clipping rectangles into framebuffer space
                 ImVec2 clip_min(pcmd->ClipRect.x - clip_off.x, pcmd->ClipRect.y - clip_off.y);
                 ImVec2 clip_max(pcmd->ClipRect.z - clip_off.x, pcmd->ClipRect.w - clip_off.y);
-                if (clip_max.x < clip_min.x || clip_max.y < clip_min.y)
+                if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
                     continue;
 
                 // Apply Scissor/clipping rectangle, Bind texture, Draw

backends/imgui_impl_dx9.cpp

@@ -251,7 +251,7 @@ void ImGui_ImplDX9_RenderDrawData(ImDrawData* draw_data)
                 // Project scissor/clipping rectangles into framebuffer space
                 ImVec2 clip_min(pcmd->ClipRect.x - clip_off.x, pcmd->ClipRect.y - clip_off.y);
                 ImVec2 clip_max(pcmd->ClipRect.z - clip_off.x, pcmd->ClipRect.w - clip_off.y);
-                if (clip_max.x < clip_min.x || clip_max.y < clip_min.y)
+                if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
                     continue;
 
                 // Apply Scissor/clipping rectangle, Bind texture, Draw

backends/imgui_impl_metal.mm

@@ -513,7 +513,7 @@ void ImGui_ImplMetal_DestroyDeviceObjects()
                 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 < clip_min.x || clip_max.y < clip_min.y)
+                if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
                     continue;
 
                 // Apply scissor/clipping rectangle

backends/imgui_impl_opengl2.cpp

@@ -203,7 +203,7 @@ void ImGui_ImplOpenGL2_RenderDrawData(ImDrawData* draw_data)
                 // Project scissor/clipping rectangles into framebuffer space
                 ImVec2 clip_min((pcmd->ClipRect.x - clip_off.x) * clip_scale.x, (pcmd->ClipRect.y - clip_off.y) * clip_scale.y);
                 ImVec2 clip_max((pcmd->ClipRect.z - clip_off.x) * clip_scale.x, (pcmd->ClipRect.w - clip_off.y) * clip_scale.y);
-                if (clip_max.x < clip_min.x || clip_max.y < clip_min.y)
+                if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
                     continue;
 
                 // Apply scissor/clipping rectangle (Y is inverted in OpenGL)

backends/imgui_impl_opengl3.cpp

@@ -445,7 +445,7 @@ void    ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data)
                 // Project scissor/clipping rectangles into framebuffer space
                 ImVec2 clip_min((pcmd->ClipRect.x - clip_off.x) * clip_scale.x, (pcmd->ClipRect.y - clip_off.y) * clip_scale.y);
                 ImVec2 clip_max((pcmd->ClipRect.z - clip_off.x) * clip_scale.x, (pcmd->ClipRect.w - clip_off.y) * clip_scale.y);
-                if (clip_max.x < clip_min.x || clip_max.y < clip_min.y)
+                if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
                     continue;
 
                 // Apply scissor/clipping rectangle (Y is inverted in OpenGL)

backends/imgui_impl_sdlrenderer.cpp

@@ -164,7 +164,7 @@ void ImGui_ImplSDLRenderer_RenderDrawData(ImDrawData* draw_data)
                 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 < clip_min.x || clip_max.y < clip_min.y)
+                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) };

backends/imgui_impl_vulkan.cpp

@@ -520,7 +520,7 @@ void ImGui_ImplVulkan_RenderDrawData(ImDrawData* draw_data, VkCommandBuffer comm
                 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 < clip_min.x || clip_max.y < clip_min.y)
+                if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
                     continue;
 
                 // Apply scissor/clipping rectangle

backends/imgui_impl_wgpu.cpp

@@ -447,7 +447,7 @@ void ImGui_ImplWGPU_RenderDrawData(ImDrawData* draw_data, WGPURenderPassEncoder
                 // Project scissor/clipping rectangles into framebuffer space
                 ImVec2 clip_min((pcmd->ClipRect.x - clip_off.x) * clip_scale.x, (pcmd->ClipRect.y - clip_off.y) * clip_scale.y);
                 ImVec2 clip_max((pcmd->ClipRect.z - clip_off.x) * clip_scale.x, (pcmd->ClipRect.w - clip_off.y) * clip_scale.y);
-                if (clip_max.x < clip_min.x || clip_max.y < clip_min.y)
+                if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
                     continue;
 
                 // Apply scissor/clipping rectangle, Draw

docs/CHANGELOG.txt

@@ -79,6 +79,7 @@ Other Changes:
 - Backends: Vulkan: Call vkCmdSetScissor() at the end of render with a full-viewport to reduce
   likehood of issues with people using VK_DYNAMIC_STATE_SCISSOR in their app without calling
   vkCmdSetScissor() explicitly every frame. (#4644)
+- Backends: DX12: Fixed DRAW_EMPTY_SCISSOR_RECTANGLE warnings. (#4775)
 - Backends: WebGPU: Passing explicit buffer sizes to wgpuRenderPassEncoderSetVertexBuffer() and
   wgpuRenderPassEncoderSetIndexBuffer() functions as validation layers appears to not do what the
   in-flux specs says. (#4766) [@meshula]