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Backends, Examples: WebGPU: added support for WGVK. (#9316, #9246, #9257)

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Squashed: minified SPIRV binaries by stripping strings + emitting in binary_to_compressed_c.
This commit is contained in:
r-lyeh
2026-03-21 00:36:24 +01:00
committed by ocornut
parent 0b82487fed
commit 59780020f6
5 changed files with 97 additions and 13 deletions
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89
backends/imgui_impl_wgpu.cpp
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@@ -56,14 +56,14 @@
#include <stdio.h>
// One of IMGUI_IMPL_WEBGPU_BACKEND_DAWN or IMGUI_IMPL_WEBGPU_BACKEND_WGPU must be provided. See imgui_impl_wgpu.h for more details.
#if defined(IMGUI_IMPL_WEBGPU_BACKEND_DAWN) == defined(IMGUI_IMPL_WEBGPU_BACKEND_WGPU)
#error Exactly one of IMGUI_IMPL_WEBGPU_BACKEND_DAWN or IMGUI_IMPL_WEBGPU_BACKEND_WGPU must be defined!
#if !defined(IMGUI_IMPL_WEBGPU_BACKEND_DAWN) && !defined(IMGUI_IMPL_WEBGPU_BACKEND_WGPU) && !defined(IMGUI_IMPL_WEBGPU_BACKEND_WGVK)
#error Exactly one of IMGUI_IMPL_WEBGPU_BACKEND_DAWN, IMGUI_IMPL_WEBGPU_BACKEND_WGPU or IMGUI_IMPL_WEBGPU_BACKEND_WGVK must be defined!
#endif
#if defined(__EMSCRIPTEN__) && defined(IMGUI_IMPL_WEBGPU_BACKEND_WGPU)
#error Emscripten <4.0.10 with '-sUSE_WEBGPU=1' is not supported anymore.
#endif
#ifdef IMGUI_IMPL_WEBGPU_BACKEND_DAWN
#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;
@@ -185,6 +185,60 @@ fn main(in: VertexOutput) -> @location(0) vec4<f32> {
}
)";
// Same shader as __shader_vert_wgsl[] but compiled as SPIRV.
// 'wgslc -o vert.spv vert.wgsl' + 'binary_to_compressed_c -u8 -nocompress vert.spv'
static const unsigned char __shader_vert_spirv[1996] =
{
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0,0,62,0,4,0,21,0,0,0,41,0,0,0,0,0,0,0,253,0,1,0,56,0,1,0,
};
// Same shader as __shader_frag_wgsl[] but compiled as SPIRV.
// 'wgslc -o frag.spv frag.wgsl' + 'binary_to_compressed_c -u8 -nocompress frag.spv'
static const unsigned char __shader_frag_spirv[1392] =
{
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};
static void SafeRelease(ImDrawIdx*& res)
{
if (res)
@@ -273,6 +327,25 @@ static WGPUProgrammableStageDescriptor ImGui_ImplWGPU_CreateShaderModule(const c
return stage_desc;
}
static WGPUProgrammableStageDescriptor ImGui_ImplWGPU_CreateShaderModule(const void* spirv_binary, size_t spirv_length)
{
ImGui_ImplWGPU_Data* bd = ImGui_ImplWGPU_GetBackendData();
WGPUShaderSourceSPIRV spirv_desc = {};
spirv_desc.chain.sType = WGPUSType_ShaderSourceSPIRV;
spirv_desc.code = (const uint32_t *)spirv_binary;
spirv_desc.codeSize = ((uint32_t)(spirv_length / 4));
WGPUShaderModuleDescriptor desc = {};
desc.nextInChain = (WGPUChainedStruct*)&spirv_desc;
WGPUProgrammableStageDescriptor stage_desc = {};
stage_desc.module = wgpuDeviceCreateShaderModule(bd->wgpuDevice, &desc);
stage_desc.entryPoint = { "main", WGPU_STRLEN };
return stage_desc;
}
static WGPUBindGroup ImGui_ImplWGPU_CreateImageBindGroup(WGPUBindGroupLayout layout, WGPUTextureView texture)
{
ImGui_ImplWGPU_Data* bd = ImGui_ImplWGPU_GetBackendData();
@@ -666,13 +739,14 @@ bool ImGui_ImplWGPU_CreateDeviceObjects()
// Create the vertex shader
WGPUProgrammableStageDescriptor vertex_shader_desc = ImGui_ImplWGPU_CreateShaderModule(__shader_vert_wgsl);
if (!vertex_shader_desc.module) vertex_shader_desc = ImGui_ImplWGPU_CreateShaderModule(__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[] =
{
#ifdef IMGUI_IMPL_WEBGPU_BACKEND_DAWN
#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 },
@@ -694,6 +768,7 @@ bool ImGui_ImplWGPU_CreateDeviceObjects()
// Create the pixel shader
WGPUProgrammableStageDescriptor pixel_shader_desc = ImGui_ImplWGPU_CreateShaderModule(__shader_frag_wgsl);
if (!pixel_shader_desc.module) pixel_shader_desc = ImGui_ImplWGPU_CreateShaderModule(__shader_frag_spirv, sizeof(__shader_frag_spirv));
// Create the blending setup
WGPUBlendState blend_state = {};
@@ -806,6 +881,8 @@ bool ImGui_ImplWGPU_Init(ImGui_ImplWGPU_InitInfo* init_info)
#endif
#elif defined(IMGUI_IMPL_WEBGPU_BACKEND_WGPU)
io.BackendRendererName = "imgui_impl_wgpu (WGPU, Native)";
#elif defined(IMGUI_IMPL_WEBGPU_BACKEND_WGVK)
io.BackendRendererName = "imgui_impl_wgpu (WGVK, Native)";
#endif
io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset; // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
io.BackendFlags |= ImGuiBackendFlags_RendererHasTextures; // We can honor ImGuiPlatformIO::Textures[] requests during render.
@@ -877,7 +954,7 @@ void ImGui_ImplWGPU_NewFrame()
bool ImGui_ImplWGPU_IsSurfaceStatusError(WGPUSurfaceGetCurrentTextureStatus status)
{
#if defined(IMGUI_IMPL_WEBGPU_BACKEND_DAWN)
#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);
@@ -894,7 +971,7 @@ bool ImGui_ImplWGPU_IsSurfaceStatusSubOptimal(WGPUSurfaceGetCurrentTextureStatus
}
// Helpers to obtain a string
#if defined(IMGUI_IMPL_WEBGPU_BACKEND_DAWN)
#if defined(IMGUI_IMPL_WEBGPU_BACKEND_DAWN) || defined(IMGUI_IMPL_WEBGPU_BACKEND_WGVK)
const char* ImGui_ImplWGPU_GetErrorTypeName(WGPUErrorType type)
{
switch (type)