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Backends: Metal: add sampler states and DrawCallback_SetSamplerLinear / DrawCallback_SetSamplerNearest callbacks. (#9381, #9371, #9378)

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Vlad
2026-04-27 16:06:33 +09:00
committed by ocornut
parent d1a8995634
commit dee9b15bbe
4 changed files with 33 additions and 14 deletions
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2
backends/imgui_impl_metal.h
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@@ -5,8 +5,6 @@
// [X] Renderer: User texture binding. Use 'MTLTexture' as texture identifier. Read the FAQ about ImTextureID/ImTextureRef!
// [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
// [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
// Missing features or Issues:
// [ ] Renderer: Missing support for DrawCallback_SetSamplerLinear, DrawCallback_SetSamplerNearest callbacks.
// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.

33
backends/imgui_impl_metal.mm
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@@ -5,8 +5,6 @@
// [X] Renderer: User texture binding. Use 'MTLTexture' as texture identifier. Read the FAQ about ImTextureID/ImTextureRef!
// [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
// [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
// Missing features or Issues:
// [ ] Renderer: Missing support for DrawCallback_SetSamplerLinear, DrawCallback_SetSamplerNearest callbacks.
// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
@@ -18,6 +16,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2026-04-28: Added support for standard draw callbacks (in platform_io): DrawCallback_SetSamplerLinear and DrawCallback_SetSamplerNearest. (#9378, #9381)
// 2026-04-23: Added support for standard draw callbacks (in platform_io): DrawCallback_ResetRenderState (others are not yet supported). (#9378)
// 2026-04-14: Metal: use a dedicated bufferCacheLock to avoid crashing when bufferCache is replaced by a new object while being used for @synchronize(). (#9367)
// 2026-04-03: Metal: avoid redundant vertex buffer bind in SetupRenderState. (#9343)
@@ -79,6 +78,8 @@
@interface MetalContext : NSObject
@property (nonatomic, strong) id<MTLDevice> device;
@property (nonatomic, strong) id<MTLDepthStencilState> depthStencilState;
@property (nonatomic, strong) id<MTLSamplerState> samplerStateLinear;
@property (nonatomic, strong) id<MTLSamplerState> samplerStateNearest;
@property (nonatomic, strong) FramebufferDescriptor* framebufferDescriptor; // framebuffer descriptor for current frame; transient
@property (nonatomic, strong) NSMutableDictionary* renderPipelineStateCache; // pipeline cache; keyed on framebuffer descriptors
@property (nonatomic, strong) NSMutableArray<MetalBuffer*>* bufferCache;
@@ -91,6 +92,7 @@
struct ImGui_ImplMetal_Data
{
MetalContext* SharedMetalContext;
id<MTLRenderCommandEncoder> RenderCommandEncoder;
ImGui_ImplMetal_Data() { memset((void*)this, 0, sizeof(*this)); }
};
@@ -185,12 +187,15 @@ static void ImGui_ImplMetal_SetupRenderState(ImDrawData* draw_data, id<MTLComman
[commandEncoder setVertexBytes:&ortho_projection length:sizeof(ortho_projection) atIndex:1];
[commandEncoder setRenderPipelineState:renderPipelineState];
[commandEncoder setFragmentSamplerState:bd->SharedMetalContext.samplerStateLinear atIndex:0];
[commandEncoder setVertexBuffer:vertexBuffer.buffer offset:vertexBufferOffset atIndex:0];
}
// Draw callbacks
static void ImGui_ImplMetal_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_ImplMetal_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_ImplMetal_DrawCallback_SetSamplerLinear(const ImDrawList*, const ImDrawCmd*) { ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData(); [bd->RenderCommandEncoder setFragmentSamplerState:bd->SharedMetalContext.samplerStateLinear atIndex:0]; }
static void ImGui_ImplMetal_DrawCallback_SetSamplerNearest(const ImDrawList*, const ImDrawCmd*) { ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData(); [bd->RenderCommandEncoder setFragmentSamplerState:bd->SharedMetalContext.samplerStateNearest atIndex:0]; }
// Metal Render function.
void ImGui_ImplMetal_RenderDrawData(ImDrawData* draw_data, id<MTLCommandBuffer> commandBuffer, id<MTLRenderCommandEncoder> commandEncoder)
@@ -228,6 +233,7 @@ void ImGui_ImplMetal_RenderDrawData(ImDrawData* draw_data, id<MTLCommandBuffer>
MetalBuffer* vertexBuffer = [ctx dequeueReusableBufferOfLength:vertexBufferLength device:commandBuffer.device];
MetalBuffer* indexBuffer = [ctx dequeueReusableBufferOfLength:indexBufferLength device:commandBuffer.device];
bd->RenderCommandEncoder = commandEncoder;
ImGui_ImplMetal_SetupRenderState(draw_data, commandBuffer, commandEncoder, renderPipelineState, vertexBuffer, 0);
// Will project scissor/clipping rectangles into framebuffer space
@@ -306,6 +312,7 @@ void ImGui_ImplMetal_RenderDrawData(ImDrawData* draw_data, id<MTLCommandBuffer>
[sharedMetalContext.bufferCache addObject:indexBuffer];
}
}];
bd->RenderCommandEncoder = nil;
}
static void ImGui_ImplMetal_DestroyTexture(ImTextureData* tex)
@@ -382,7 +389,17 @@ bool ImGui_ImplMetal_CreateDeviceObjects(id<MTLDevice> device)
depthStencilDescriptor.depthWriteEnabled = NO;
depthStencilDescriptor.depthCompareFunction = MTLCompareFunctionAlways;
bd->SharedMetalContext.depthStencilState = [device newDepthStencilStateWithDescriptor:depthStencilDescriptor];
MTLSamplerDescriptor* samplerDescriptor = [[MTLSamplerDescriptor alloc] init];
samplerDescriptor.minFilter = MTLSamplerMinMagFilterLinear;
samplerDescriptor.magFilter = MTLSamplerMinMagFilterLinear;
samplerDescriptor.mipFilter = MTLSamplerMipFilterLinear;
bd->SharedMetalContext.samplerStateLinear = [device newSamplerStateWithDescriptor:samplerDescriptor];
samplerDescriptor.minFilter = MTLSamplerMinMagFilterNearest;
samplerDescriptor.magFilter = MTLSamplerMinMagFilterNearest;
samplerDescriptor.mipFilter = MTLSamplerMipFilterNearest;
bd->SharedMetalContext.samplerStateNearest = [device newSamplerStateWithDescriptor:samplerDescriptor];
#ifdef IMGUI_IMPL_METAL_CPP
[samplerDescriptor release];
[depthStencilDescriptor release];
#endif
@@ -399,6 +416,8 @@ void ImGui_ImplMetal_DestroyDeviceObjects()
ImGui_ImplMetal_DestroyTexture(tex);
[bd->SharedMetalContext.renderPipelineStateCache removeAllObjects];
bd->SharedMetalContext.samplerStateLinear = nil;
bd->SharedMetalContext.samplerStateNearest = nil;
}
bool ImGui_ImplMetal_Init(id<MTLDevice> device)
@@ -415,6 +434,8 @@ bool ImGui_ImplMetal_Init(id<MTLDevice> device)
ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
platform_io.DrawCallback_ResetRenderState = ImGui_ImplMetal_DrawCallback_ResetRenderState;
platform_io.DrawCallback_SetSamplerLinear = ImGui_ImplMetal_DrawCallback_SetSamplerLinear;
platform_io.DrawCallback_SetSamplerNearest = ImGui_ImplMetal_DrawCallback_SetSamplerNearest;
bd->SharedMetalContext = [[MetalContext alloc] init];
bd->SharedMetalContext.device = device;
@@ -599,9 +620,9 @@ void ImGui_ImplMetal_Shutdown()
"}\n"
"\n"
"fragment half4 fragment_main(VertexOut in [[stage_in]],\n"
" texture2d<half, access::sample> texture [[texture(0)]]) {\n"
" constexpr sampler linearSampler(coord::normalized, min_filter::linear, mag_filter::linear, mip_filter::linear);\n"
" half4 texColor = texture.sample(linearSampler, in.texCoords);\n"
" texture2d<half, access::sample> texture [[texture(0)]],\n"
" sampler textureSampler [[sampler(0)]]) {\n"
" half4 texColor = texture.sample(textureSampler, in.texCoords);\n"
" return half4(in.color) * texColor;\n"
"}\n";