Backends: WebGPU: fixed rendering when a depth buffer is enabled. (#5869)

backends/imgui_impl_wgpu.cpp

@@ -13,9 +13,10 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2022-11-10: Fixed rendering when a depth buffer is enabled. Added 'WGPUTextureFormat depth_format' parameter to ImGui_ImplWGPU_Init().
 //  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.
+//  2021-08-24: Fixed for latest specs.
 //  2021-05-24: Add support for draw_data->FramebufferScale.
 //  2021-05-19: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement)
 //  2021-05-16: Update to latest WebGPU specs (compatible with Emscripten 2.0.20 and Chrome Canary 92).
@@ -34,6 +35,7 @@ extern ImGuiID ImHashData(const void* data_p, size_t data_size, ImU32 seed = 0);
 static WGPUDevice               g_wgpuDevice = nullptr;
 static WGPUQueue                g_defaultQueue = nullptr;
 static WGPUTextureFormat        g_renderTargetFormat = WGPUTextureFormat_Undefined;
+static WGPUTextureFormat        g_depthStencilFormat = WGPUTextureFormat_Undefined;
 static WGPURenderPipeline       g_pipelineState = nullptr;
 
 struct RenderResources
@@ -602,12 +604,11 @@ bool ImGui_ImplWGPU_CreateDeviceObjects()
 
     // Create depth-stencil State
     WGPUDepthStencilState depth_stencil_state = {};
-    depth_stencil_state.depthBias = 0;
+    depth_stencil_state.format = g_depthStencilFormat;
-    depth_stencil_state.depthBiasClamp = 0;
+    depth_stencil_state.depthWriteEnabled = false;
-    depth_stencil_state.depthBiasSlopeScale = 0;
 
     // Configure disabled depth-stencil state
-    graphics_pipeline_desc.depthStencil = nullptr;
+    graphics_pipeline_desc.depthStencil = g_depthStencilFormat == WGPUTextureFormat_Undefined  ? nullptr :  &depth_stencil_state;
 
     g_pipelineState = wgpuDeviceCreateRenderPipeline(g_wgpuDevice, &graphics_pipeline_desc);
 
@@ -658,7 +659,7 @@ void ImGui_ImplWGPU_InvalidateDeviceObjects()
         SafeRelease(g_pFrameResources[i]);
 }
 
-bool ImGui_ImplWGPU_Init(WGPUDevice device, int num_frames_in_flight, WGPUTextureFormat rt_format)
+bool ImGui_ImplWGPU_Init(WGPUDevice device, int num_frames_in_flight, WGPUTextureFormat rt_format, WGPUTextureFormat depth_format)
 {
     // Setup backend capabilities flags
     ImGuiIO& io = ImGui::GetIO();
@@ -668,6 +669,7 @@ bool ImGui_ImplWGPU_Init(WGPUDevice device, int num_frames_in_flight, WGPUTextur
     g_wgpuDevice = device;
     g_defaultQueue = wgpuDeviceGetQueue(g_wgpuDevice);
     g_renderTargetFormat = rt_format;
+    g_depthStencilFormat = depth_format;
     g_pFrameResources = new FrameResources[num_frames_in_flight];
     g_numFramesInFlight = num_frames_in_flight;
     g_frameIndex = UINT_MAX;

backends/imgui_impl_wgpu.h

@@ -15,7 +15,7 @@
 #include "imgui.h"          // IMGUI_IMPL_API
 #include <webgpu/webgpu.h>
 
-IMGUI_IMPL_API bool ImGui_ImplWGPU_Init(WGPUDevice device, int num_frames_in_flight, WGPUTextureFormat rt_format);
+IMGUI_IMPL_API bool ImGui_ImplWGPU_Init(WGPUDevice device, int num_frames_in_flight, WGPUTextureFormat rt_format, WGPUTextureFormat depth_format = WGPUTextureFormat_Undefined);
 IMGUI_IMPL_API void ImGui_ImplWGPU_Shutdown();
 IMGUI_IMPL_API void ImGui_ImplWGPU_NewFrame();
 IMGUI_IMPL_API void ImGui_ImplWGPU_RenderDrawData(ImDrawData* draw_data, WGPURenderPassEncoder pass_encoder);

docs/CHANGELOG.txt

@@ -206,6 +206,9 @@ Other Changes:
   (e.g. for multi-viewport support) and don't capture mouse when drag and dropping. (#5710)
 - Backends: Win32: Convert WM_CHAR values with MultiByteToWideChar() when window class was
   registered as MBCS (not Unicode). (#5725, #1807, #471, #2815, #1060) [@or75, @ocornut]
+- Backends: OSX: Fixed mouse inputs on flipped views. (#5756) [@Nemirtingas]
+- Backends: OSX: Fixed mouse coordinate before clicking on the host window. (#5842) [@maezawa-akira]
+- Backends: OSX: Fixes to support full app creation in C++. (#5403) [@stack]
 - Backends: OpenGL3: Reverted use of glBufferSubData(), too many corruptions issues were reported,
   and old leaks issues seemingly can't be reproed with Intel drivers nowadays (revert earlier changes).
   (#4468, #4504, #3381, #2981, #4825, #4832, #5127).
@@ -213,9 +216,7 @@ Other Changes:
 - 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: WebGPU: fixed rendering when a depth buffer is enabled. (#5869) [@brainlag]
-- Backends: OSX: Fixed mouse coordinate before clicking on the host window. (#5842) [@maezawa-akira]
-- Backends: OSX: Fixes to support full app creation in C++. (#5403) [@stack]
 
 
 -----------------------------------------------------------------------

examples/example_emscripten_wgpu/main.cpp

@@ -76,7 +76,7 @@ int main(int, char**)
 
     // Setup Platform/Renderer backends
     ImGui_ImplGlfw_InitForOther(window, true);
-    ImGui_ImplWGPU_Init(wgpu_device, 3, WGPUTextureFormat_RGBA8Unorm);
+    ImGui_ImplWGPU_Init(wgpu_device, 3, WGPUTextureFormat_RGBA8Unorm, WGPUTextureFormat_Undefined);
 
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.