Examples: DirectX12: Moved the ID3D12GraphicsCommandList* parameter from ImGui_ImplDX12_NewFrame() to ImGui_ImplDX12_RenderDrawData() which makes a lots more sense. (#301)

CHANGELOG.txt

@@ -83,6 +83,7 @@ Other Changes:
  - Examples: Added SDL+Vulkan example.
  - Examples: Allegro5: Added support for ImGuiConfigFlags_NoMouseCursorChange flag. Added clipboard support. 
  - Examples: Allegro5: Unindexing buffers ourselves as Allegro indexed drawing primitives are buggy in the DirectX9 back-end.
+ - Examples: DirectX12: Moved the ID3D12GraphicsCommandList* parameter from ImGui_ImplDX12_NewFrame() to ImGui_ImplDX12_RenderDrawData() which makes a lots more sense. (#301)
  - Examples: FreeGLUT: Added FreeGLUT bindings. Added FreeGLUT+OpenGL2 example. (#801)
  - Examples: The functions in imgui_impl_xxx.cpp are prefixed with IMGUI_IMPL_API (which defaults to IMGUI_API) to facilitate some uses. (#1888)
  - Examples: Fixed bindings to use ImGuiMouseCursor_COUNT instead of old name ImGuiMouseCursor_Count_ so they can compile with IMGUI_DISABLE_OBSOLETE_FUNCTIONS. (#1887) 

examples/example_win32_directx12/main.cpp

@@ -339,7 +339,7 @@ int main(int, char**)
         }
 
         // Start the ImGui frame
-        ImGui_ImplDX12_NewFrame(g_pd3dCommandList);
+        ImGui_ImplDX12_NewFrame();
         ImGui_ImplWin32_NewFrame();
         ImGui::NewFrame();
 
@@ -399,7 +399,7 @@ int main(int, char**)
         g_pd3dCommandList->OMSetRenderTargets(1, &g_mainRenderTargetDescriptor[backBufferIdx], FALSE, NULL);
         g_pd3dCommandList->SetDescriptorHeaps(1, &g_pd3dSrvDescHeap);
         ImGui::Render();
-        ImGui_ImplDX12_RenderDrawData(ImGui::GetDrawData());
+        ImGui_ImplDX12_RenderDrawData(ImGui::GetDrawData(), g_pd3dCommandList);
         barrier.Transition.StateBefore = D3D12_RESOURCE_STATE_RENDER_TARGET;
         barrier.Transition.StateAfter  = D3D12_RESOURCE_STATE_PRESENT;
         g_pd3dCommandList->ResourceBarrier(1, &barrier);

examples/imgui_impl_dx12.cpp

@@ -1,8 +1,10 @@
-// ImGui Win32 + DirectX12 binding
+// ImGui Renderer for: DirectX12
-// FIXME: 64-bit only for now! (Because sizeof(ImTextureId) == sizeof(void*))
+// This needs to be used along with a Platform Binding (e.g. Win32)
 
 // Implemented features:
 //  [X] Renderer: User texture binding. Use 'D3D12_GPU_DESCRIPTOR_HANDLE' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
+// Issues:
+//  [ ] 64-bit only for now! (Because sizeof(ImTextureId) == sizeof(void*)). See github.com/ocornut/imgui/pull/301
 
 // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
 // If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().
@@ -11,6 +13,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2018-06-12: DirectX12: Moved the ID3D12GraphicsCommandList* parameter from NewFrame() to RenderDrawData().
 //  2018-06-08: Misc: Extracted imgui_impl_dx12.cpp/.h away from the old combined DX12+Win32 example.
 //  2018-06-08: DirectX12: Use draw_data->DisplayPos and draw_data->DisplaySize to setup projection matrix and clipping rectangle (to ease support for future multi-viewport).
 //  2018-02-22: Merged into master with all Win32 code synchronized to other examples.
@@ -25,7 +28,6 @@
 
 // DirectX data
 static ID3D12Device*                g_pd3dDevice = NULL;
-static ID3D12GraphicsCommandList*   g_pd3dCommandList = NULL;
 static ID3D10Blob*                  g_pVertexShaderBlob = NULL;
 static ID3D10Blob*                  g_pPixelShaderBlob = NULL;
 static ID3D12RootSignature*         g_pRootSignature = NULL;
@@ -53,7 +55,7 @@ struct VERTEX_CONSTANT_BUFFER
 
 // Render function
 // (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
-void ImGui_ImplDX12_RenderDrawData(ImDrawData* draw_data)
+void ImGui_ImplDX12_RenderDrawData(ImDrawData* draw_data, ID3D12GraphicsCommandList* ctx)
 {
     // FIXME: I'm assuming that this only gets called once per frame!
     // If not, we can't just re-allocate the IB or VB, we'll have to do a proper allocator.
@@ -63,7 +65,6 @@ void ImGui_ImplDX12_RenderDrawData(ImDrawData* draw_data)
     ID3D12Resource* g_pIB = frameResources->IB;
     int g_VertexBufferSize = frameResources->VertexBufferSize;
     int g_IndexBufferSize = frameResources->IndexBufferSize;
-    ID3D12GraphicsCommandList* ctx = g_pd3dCommandList;
 
     // Create and grow vertex/index buffers if needed
     if (!g_pVB || g_VertexBufferSize < draw_data->TotalVtxCount)
@@ -594,6 +595,7 @@ bool ImGui_ImplDX12_Init(ID3D12Device* device, int num_frames_in_flight, DXGI_FO
     g_numFramesInFlight = num_frames_in_flight;
     g_frameIndex = UINT_MAX;
 
+    // Create buffers with a default size (they will later be grown as needed)
     for (int i = 0; i < num_frames_in_flight; i++)
     {
         g_pFrameResources[i].IB = NULL;
@@ -610,7 +612,6 @@ void ImGui_ImplDX12_Shutdown()
     ImGui_ImplDX12_InvalidateDeviceObjects();
     delete[] g_pFrameResources;
     g_pd3dDevice = NULL;
-    g_pd3dCommandList = NULL;
     g_hFontSrvCpuDescHandle.ptr = 0;
     g_hFontSrvGpuDescHandle.ptr = 0;
     g_pFrameResources = NULL;
@@ -618,10 +619,8 @@ void ImGui_ImplDX12_Shutdown()
     g_frameIndex = UINT_MAX;
 }
 
-void ImGui_ImplDX12_NewFrame(ID3D12GraphicsCommandList* command_list)
+void ImGui_ImplDX12_NewFrame()
 {
     if (!g_pPipelineState)
         ImGui_ImplDX12_CreateDeviceObjects();
-
-    g_pd3dCommandList = command_list;
 }

examples/imgui_impl_dx12.h

@@ -1,8 +1,10 @@
-// ImGui Win32 + DirectX12 binding
+// ImGui Renderer for: DirectX12
-// FIXME: 64-bit only for now! (Because sizeof(ImTextureId) == sizeof(void*))
+// This needs to be used along with a Platform Binding (e.g. Win32)
 
 // Implemented features:
 //  [X] Renderer: User texture binding. Use 'D3D12_GPU_DESCRIPTOR_HANDLE' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
+// Issues:
+//  [ ] 64-bit only for now! (Because sizeof(ImTextureId) == sizeof(void*)). See github.com/ocornut/imgui/pull/301
 
 // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
 // If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().
@@ -22,8 +24,8 @@ struct D3D12_GPU_DESCRIPTOR_HANDLE;
 IMGUI_IMPL_API bool     ImGui_ImplDX12_Init(ID3D12Device* device, int num_frames_in_flight, DXGI_FORMAT rtv_format,
                                             D3D12_CPU_DESCRIPTOR_HANDLE font_srv_cpu_desc_handle, D3D12_GPU_DESCRIPTOR_HANDLE font_srv_gpu_desc_handle);
 IMGUI_IMPL_API void     ImGui_ImplDX12_Shutdown();
-IMGUI_IMPL_API void     ImGui_ImplDX12_NewFrame(ID3D12GraphicsCommandList* cmd_list);
+IMGUI_IMPL_API void     ImGui_ImplDX12_NewFrame();
-IMGUI_IMPL_API void     ImGui_ImplDX12_RenderDrawData(ImDrawData* draw_data);
+IMGUI_IMPL_API void     ImGui_ImplDX12_RenderDrawData(ImDrawData* draw_data, ID3D12GraphicsCommandList* graphics_command_list);
 
 // Use if you want to reset your rendering device without losing ImGui state.
 IMGUI_IMPL_API void     ImGui_ImplDX12_InvalidateDeviceObjects();