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Fix build errors for wgpu backend #9377

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Fix build errors for wgpu backend #9377

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4ceac32
Fix compile errors when using wgpu-native as a backend
lucascompython Apr 23, 2026
2246cd0
Merge branch 'ocornut:master' into fix-wgpu-native
lucascompython Apr 23, 2026
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28 changes: 6 additions & 22 deletions backends/imgui_impl_wgpu.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -64,12 +64,6 @@
#error Emscripten <4.0.10 with '-sUSE_WEBGPU=1' is not supported anymore.
#endif

#if defined IMGUI_IMPL_WEBGPU_BACKEND_DAWN || defined IMGUI_IMPL_WEBGPU_BACKEND_WGVK
// Dawn renamed WGPUProgrammableStageDescriptor to WGPUComputeState (see: https://github.com/webgpu-native/webgpu-headers/pull/413)
// Using type alias until WGPU adopts the same naming convention (#8369)
using WGPUProgrammableStageDescriptor = WGPUComputeState;
#endif

// Dear ImGui prototypes from imgui_internal.h
extern ImGuiID ImHashData(const void* data_p, size_t data_size, ImU32 seed);
#define MEMALIGN(_SIZE,_ALIGN) (((_SIZE) + ((_ALIGN) - 1)) & ~((_ALIGN) - 1)) // Memory align (copied from IM_ALIGN() macro).
Expand Down Expand Up @@ -310,7 +304,7 @@ static void SafeRelease(FrameResources& res)
SafeRelease(res.VertexBufferHost);
}

static WGPUProgrammableStageDescriptor ImGui_ImplWGPU_CreateShaderModuleWGSL(const char* wgsl_source)
static WGPUComputeState ImGui_ImplWGPU_CreateShaderModuleWGSL(const char* wgsl_source)
{
ImGui_ImplWGPU_Data* bd = ImGui_ImplWGPU_GetBackendData();

Expand All @@ -321,14 +315,14 @@ static WGPUProgrammableStageDescriptor ImGui_ImplWGPU_CreateShaderModuleWGSL(con
WGPUShaderModuleDescriptor desc = {};
desc.nextInChain = (WGPUChainedStruct*)&wgsl_desc;

WGPUProgrammableStageDescriptor stage_desc = {};
WGPUComputeState stage_desc = {};
stage_desc.module = wgpuDeviceCreateShaderModule(bd->wgpuDevice, &desc);

stage_desc.entryPoint = { "main", WGPU_STRLEN };
return stage_desc;
}

static WGPUProgrammableStageDescriptor ImGui_ImplWGPU_CreateShaderModuleSPIRV(const void* spirv_binary, size_t spirv_length)
static WGPUComputeState ImGui_ImplWGPU_CreateShaderModuleSPIRV(const void* spirv_binary, size_t spirv_length)
{
ImGui_ImplWGPU_Data* bd = ImGui_ImplWGPU_GetBackendData();

Expand All @@ -340,7 +334,7 @@ static WGPUProgrammableStageDescriptor ImGui_ImplWGPU_CreateShaderModuleSPIRV(co
WGPUShaderModuleDescriptor desc = {};
desc.nextInChain = (WGPUChainedStruct*)&spirv_desc;

WGPUProgrammableStageDescriptor stage_desc = {};
WGPUComputeState stage_desc = {};
stage_desc.module = wgpuDeviceCreateShaderModule(bd->wgpuDevice, &desc);

stage_desc.entryPoint = { "main", WGPU_STRLEN };
Expand Down Expand Up @@ -739,23 +733,17 @@ bool ImGui_ImplWGPU_CreateDeviceObjects()
graphics_pipeline_desc.layout = wgpuDeviceCreatePipelineLayout(bd->wgpuDevice, &layout_desc);

// Create the vertex shader
WGPUProgrammableStageDescriptor vertex_shader_desc = ImGui_ImplWGPU_CreateShaderModuleWGSL(__shader_vert_wgsl);
WGPUComputeState vertex_shader_desc = ImGui_ImplWGPU_CreateShaderModuleWGSL(__shader_vert_wgsl);
if (!vertex_shader_desc.module) vertex_shader_desc = ImGui_ImplWGPU_CreateShaderModuleSPIRV(__shader_vert_spirv, sizeof(__shader_vert_spirv));
graphics_pipeline_desc.vertex.module = vertex_shader_desc.module;
graphics_pipeline_desc.vertex.entryPoint = vertex_shader_desc.entryPoint;

// Vertex input configuration
WGPUVertexAttribute attribute_desc[] =
{
#if defined IMGUI_IMPL_WEBGPU_BACKEND_DAWN || defined IMGUI_IMPL_WEBGPU_BACKEND_WGVK
{ nullptr, WGPUVertexFormat_Float32x2, (uint64_t)offsetof(ImDrawVert, pos), 0 },
{ nullptr, WGPUVertexFormat_Float32x2, (uint64_t)offsetof(ImDrawVert, uv), 1 },
{ nullptr, WGPUVertexFormat_Unorm8x4, (uint64_t)offsetof(ImDrawVert, col), 2 },
#else
{ WGPUVertexFormat_Float32x2, (uint64_t)offsetof(ImDrawVert, pos), 0 },
{ WGPUVertexFormat_Float32x2, (uint64_t)offsetof(ImDrawVert, uv), 1 },
{ WGPUVertexFormat_Unorm8x4, (uint64_t)offsetof(ImDrawVert, col), 2 },
#endif
};

WGPUVertexBufferLayout buffer_layouts[1];
Expand All @@ -768,7 +756,7 @@ bool ImGui_ImplWGPU_CreateDeviceObjects()
graphics_pipeline_desc.vertex.buffers = buffer_layouts;

// Create the pixel shader
WGPUProgrammableStageDescriptor pixel_shader_desc = ImGui_ImplWGPU_CreateShaderModuleWGSL(__shader_frag_wgsl);
WGPUComputeState pixel_shader_desc = ImGui_ImplWGPU_CreateShaderModuleWGSL(__shader_frag_wgsl);
if (!pixel_shader_desc.module) pixel_shader_desc = ImGui_ImplWGPU_CreateShaderModuleSPIRV(__shader_frag_spirv, sizeof(__shader_frag_spirv));

// Create the blending setup
Expand Down Expand Up @@ -955,11 +943,7 @@ void ImGui_ImplWGPU_NewFrame()

bool ImGui_ImplWGPU_IsSurfaceStatusError(WGPUSurfaceGetCurrentTextureStatus status)
{
#if defined(IMGUI_IMPL_WEBGPU_BACKEND_DAWN) || defined(IMGUI_IMPL_WEBGPU_BACKEND_WGVK)
return (status == WGPUSurfaceGetCurrentTextureStatus_Error);
#else
return (status == WGPUSurfaceGetCurrentTextureStatus_OutOfMemory || status == WGPUSurfaceGetCurrentTextureStatus_DeviceLost);
#endif
}

bool ImGui_ImplWGPU_IsSurfaceStatusSubOptimal(WGPUSurfaceGetCurrentTextureStatus status)
Expand Down