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Backends: WebGPU: added SetSamplerLinear/Nearest draw callbacks. (#9378)

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ocornut
2026-04-23 19:22:04 +02:00
parent 37952fb3b8
commit dfe6f9ebca
3 changed files with 35 additions and 24 deletions
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55
backends/imgui_impl_wgpu.cpp
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@@ -8,7 +8,7 @@
// [X] Renderer: Expose selected render state for draw callbacks to use. Access in '(ImGui_ImplXXXX_RenderState*)GetPlatformIO().Renderer_RenderState'.
// [X] Renderer: Texture updates support for dynamic font system (ImGuiBackendFlags_RendererHasTextures).
// Missing features or Issues:
// [ ] Renderer: Missing support for DrawCallback_SetSamplerLinear, DrawCallback_SetSamplerNearest, DrawCallback_SetSamplerCustom callbacks.
// [ ] Renderer: Missing support for DrawCallback_SetSamplerCustom.
// Read imgui_impl_wgpu.h about how to use the IMGUI_IMPL_WEBGPU_BACKEND_WGPU or IMGUI_IMPL_WEBGPU_BACKEND_DAWN flags.
@@ -22,7 +22,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2026-XX-XX: Added support for standard draw callbacks (in platform_io): DrawCallback_ResetRenderState (others are not yet supported).
// 2026-XX-XX: Added support for standard draw callbacks (in platform_io): DrawCallback_ResetRenderState, DrawCallback_SetSamplerLinear, DrawCallback_SetSamplerNearest.
// 2026-03-25: Added support for WGVK native backend via IMGUI_IMPL_WEBGPU_BACKEND_WGVK define, with SPIRV shaders if WGSL is not available. (#9316, #9246, #9257)
// 2026-03-09: Removed support for Emscripten < 4.0.10. (#9281)
// 2025-10-16: Update to compile with Dawn and Emscripten's 4.0.10+ '--use-port=emdawnwebgpu' ports. (#8381, #8898)
@@ -86,11 +86,13 @@ struct ImGui_ImplWGPU_Texture
struct RenderResources
{
WGPUSampler SamplerLinear = nullptr; // Sampler for textures
WGPUBuffer Uniforms = nullptr; // Shader uniforms
WGPUBindGroup CommonBindGroup = nullptr; // Resources bind-group to bind the common resources to pipeline
ImGuiStorage ImageBindGroups; // Resources bind-group to bind the font/image resources to pipeline (this is a key->value map)
WGPUBindGroupLayout ImageBindGroupLayout = nullptr; // Cache layout used for the image bind group. Avoids allocating unnecessary JS objects when working with WebASM
WGPUSampler SamplerLinear = nullptr; // Bilinear sampler
WGPUSampler SamplerNearest = nullptr; // Nearest/point sampler
WGPUBuffer Uniforms = nullptr; // Shader uniforms
WGPUBindGroup CommonBindGroupLinear = nullptr; // Common bind-group bound to group 0 (uniforms + SamplerLinear)
WGPUBindGroup CommonBindGroupNearest = nullptr; // Common bind-group bound to group 0 (uniforms + SamplerNearest)
ImGuiStorage ImageBindGroups; // Resources bind-group to bind the font/image resources to pipeline (this is a key->value map)
WGPUBindGroupLayout ImageBindGroupLayout = nullptr; // Cache layout used for the image bind group. Avoids allocating unnecessary JS objects when working with WebASM
};
struct FrameResources
@@ -117,6 +119,7 @@ struct ImGui_ImplWGPU_Data
WGPUTextureFormat renderTargetFormat = WGPUTextureFormat_Undefined;
WGPUTextureFormat depthStencilFormat = WGPUTextureFormat_Undefined;
WGPURenderPipeline pipelineState = nullptr;
ImGui_ImplWGPU_RenderState* RenderState = nullptr; // == ImGui::GetPlatformIO().Renderer_RenderState during rendering.
RenderResources renderResources;
FrameResources* pFrameResources = nullptr;
@@ -300,8 +303,10 @@ static void SafeRelease(WGPUShaderModule& res)
static void SafeRelease(RenderResources& res)
{
SafeRelease(res.SamplerLinear);
SafeRelease(res.SamplerNearest);
SafeRelease(res.Uniforms);
SafeRelease(res.CommonBindGroup);
SafeRelease(res.CommonBindGroupLinear);
SafeRelease(res.CommonBindGroupNearest);
SafeRelease(res.ImageBindGroupLayout);
};
@@ -423,7 +428,7 @@ static void ImGui_ImplWGPU_SetupRenderState(ImDrawData* draw_data, WGPURenderPas
wgpuRenderPassEncoderSetVertexBuffer(ctx, 0, fr->VertexBuffer, 0, fr->VertexBufferSize * sizeof(ImDrawVert));
wgpuRenderPassEncoderSetIndexBuffer(ctx, fr->IndexBuffer, sizeof(ImDrawIdx) == 2 ? WGPUIndexFormat_Uint16 : WGPUIndexFormat_Uint32, 0, fr->IndexBufferSize * sizeof(ImDrawIdx));
wgpuRenderPassEncoderSetPipeline(ctx, bd->pipelineState);
wgpuRenderPassEncoderSetBindGroup(ctx, 0, bd->renderResources.CommonBindGroup, 0, nullptr);
wgpuRenderPassEncoderSetBindGroup(ctx, 0, bd->renderResources.CommonBindGroupLinear, 0, nullptr);
// Setup blend factor
WGPUColor blend_color = { 0.f, 0.f, 0.f, 0.f };
@@ -431,7 +436,9 @@ static void ImGui_ImplWGPU_SetupRenderState(ImDrawData* draw_data, WGPURenderPas
}
// Draw callbacks
static void ImGui_ImplWGPU_DrawCallback_ResetRenderState(const ImDrawList*, const ImDrawCmd*) {} // Intentionally empty. Used as an identifier for rendering loop to call its code. Simpler to implement this way.
static void ImGui_ImplWGPU_DrawCallback_ResetRenderState(const ImDrawList*, const ImDrawCmd*) {} // Intentionally empty. Used as an identifier for rendering loop to call its code. Simpler to implement this way.
static void ImGui_ImplWGPU_DrawCallback_SetSamplerLinear(const ImDrawList*, const ImDrawCmd*) { ImGui_ImplWGPU_Data* bd = ImGui_ImplWGPU_GetBackendData(); wgpuRenderPassEncoderSetBindGroup(bd->RenderState->RenderPassEncoder, 0, bd->renderResources.CommonBindGroupLinear, 0, nullptr); }
static void ImGui_ImplWGPU_DrawCallback_SetSamplerNearest(const ImDrawList*, const ImDrawCmd*) { ImGui_ImplWGPU_Data* bd = ImGui_ImplWGPU_GetBackendData(); wgpuRenderPassEncoderSetBindGroup(bd->RenderState->RenderPassEncoder, 0, bd->renderResources.CommonBindGroupNearest, 0, nullptr); }
// Render function
void ImGui_ImplWGPU_RenderDrawData(ImDrawData* draw_data, WGPURenderPassEncoder pass_encoder)
@@ -528,7 +535,7 @@ void ImGui_ImplWGPU_RenderDrawData(ImDrawData* draw_data, WGPURenderPassEncoder
ImGui_ImplWGPU_RenderState render_state;
render_state.Device = bd->wgpuDevice;
render_state.RenderPassEncoder = pass_encoder;
platform_io.Renderer_RenderState = &render_state;
platform_io.Renderer_RenderState = bd->RenderState = &render_state;
// Render command lists
// (Because we merged all buffers into a single one, we maintain our own offset into them)
@@ -591,7 +598,7 @@ void ImGui_ImplWGPU_RenderDrawData(ImDrawData* draw_data, WGPURenderPassEncoder
}
image_bind_groups.Data.resize(0);
platform_io.Renderer_RenderState = nullptr;
platform_io.Renderer_RenderState = bd->RenderState = nullptr;
}
static void ImGui_ImplWGPU_DestroyTexture(ImTextureData* tex)
@@ -819,19 +826,23 @@ bool ImGui_ImplWGPU_CreateDeviceObjects()
ImGui_ImplWGPU_CreateUniformBuffer();
// Create sampler
// Create samplers (Linear/Nearest)
// (Bilinear sampling is required by default. Set 'io.Fonts->Flags |= ImFontAtlasFlags_NoBakedLines' or 'style.AntiAliasedLinesUseTex = false' to allow point/nearest sampling)
WGPUSamplerDescriptor sampler_desc = {};
sampler_desc.minFilter = WGPUFilterMode_Linear;
sampler_desc.magFilter = WGPUFilterMode_Linear;
sampler_desc.mipmapFilter = WGPUMipmapFilterMode_Linear;
sampler_desc.addressModeU = WGPUAddressMode_ClampToEdge;
sampler_desc.addressModeV = WGPUAddressMode_ClampToEdge;
sampler_desc.addressModeW = WGPUAddressMode_ClampToEdge;
sampler_desc.maxAnisotropy = 1;
sampler_desc.minFilter = WGPUFilterMode_Linear;
sampler_desc.magFilter = WGPUFilterMode_Linear;
sampler_desc.mipmapFilter = WGPUMipmapFilterMode_Linear;
bd->renderResources.SamplerLinear = wgpuDeviceCreateSampler(bd->wgpuDevice, &sampler_desc);
sampler_desc.minFilter = WGPUFilterMode_Nearest;
sampler_desc.magFilter = WGPUFilterMode_Nearest;
sampler_desc.mipmapFilter = WGPUMipmapFilterMode_Nearest;
bd->renderResources.SamplerNearest = wgpuDeviceCreateSampler(bd->wgpuDevice, &sampler_desc);
// Create resource bind group
// Create resource bind groups (one per sampler, otherwise identical)
WGPUBindGroupEntry common_bg_entries[] =
{
{ nullptr, 0, bd->renderResources.Uniforms, 0, MEMALIGN(sizeof(Uniforms), 16), 0, 0 },
@@ -841,7 +852,9 @@ bool ImGui_ImplWGPU_CreateDeviceObjects()
common_bg_descriptor.layout = bg_layouts[0];
common_bg_descriptor.entryCount = sizeof(common_bg_entries) / sizeof(WGPUBindGroupEntry);
common_bg_descriptor.entries = common_bg_entries;
bd->renderResources.CommonBindGroup = wgpuDeviceCreateBindGroup(bd->wgpuDevice, &common_bg_descriptor);
bd->renderResources.CommonBindGroupLinear = wgpuDeviceCreateBindGroup(bd->wgpuDevice, &common_bg_descriptor);
common_bg_entries[1].sampler = bd->renderResources.SamplerNearest;
bd->renderResources.CommonBindGroupNearest = wgpuDeviceCreateBindGroup(bd->wgpuDevice, &common_bg_descriptor);
bd->renderResources.ImageBindGroupLayout = bg_layouts[1];
SafeRelease(vertex_shader_desc.module);
@@ -895,6 +908,8 @@ bool ImGui_ImplWGPU_Init(ImGui_ImplWGPU_InitInfo* init_info)
ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
platform_io.DrawCallback_ResetRenderState = ImGui_ImplWGPU_DrawCallback_ResetRenderState;
platform_io.DrawCallback_SetSamplerLinear = ImGui_ImplWGPU_DrawCallback_SetSamplerLinear;
platform_io.DrawCallback_SetSamplerNearest = ImGui_ImplWGPU_DrawCallback_SetSamplerNearest;
bd->initInfo = *init_info;
bd->wgpuDevice = init_info->Device;
@@ -904,11 +919,7 @@ bool ImGui_ImplWGPU_Init(ImGui_ImplWGPU_InitInfo* init_info)
bd->numFramesInFlight = init_info->NumFramesInFlight;
bd->frameIndex = UINT_MAX;
bd->renderResources.SamplerLinear = nullptr;
bd->renderResources.Uniforms = nullptr;
bd->renderResources.CommonBindGroup = nullptr;
bd->renderResources.ImageBindGroups.Data.reserve(100);
bd->renderResources.ImageBindGroupLayout = nullptr;
// Create buffers with a default size (they will later be grown as needed)
bd->pFrameResources = new FrameResources[bd->numFramesInFlight];