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Metal: publish SdlMetalGlobals
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@pthom
pthom committed Dec 20, 2023
1 parent e474f6e commit 47b01b5
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Showing 2 changed files with 55 additions and 114 deletions.
18 changes: 18 additions & 0 deletions src/hello_imgui/internal/backend_impls/rendering_metal.h
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Original file line number Diff line number Diff line change
@@ -1,7 +1,11 @@
#pragma once
#ifdef HELLOIMGUI_HAS_METAL

#import <Metal/Metal.h>
#import <QuartzCore/QuartzCore.h>

#ifdef HELLOIMGUI_USE_SDL2
struct SDL_Renderer;
struct SDL_Window;
#endif

Expand All @@ -15,6 +19,20 @@ namespace HelloImGui
void PrepareSdLForMetal_WithWindow_PreImGuiInit(SDL_Window* window);
void PrepareSdLForMetal_PosImGuiInit();
void SwapSdlMetalBuffers();

struct SdlMetalGlobals
{
SDL_Window* sdlWindow = nullptr;
SDL_Renderer* sdlRenderer = nullptr;
CAMetalLayer* caMetalLayer = nullptr;
id<CAMetalDrawable> caMetalDrawable = nullptr;
id<MTLCommandBuffer> mtlCommandBuffer = nullptr;
id<MTLCommandQueue> mtlCommandQueue = nullptr;
MTLRenderPassDescriptor* mtlRenderPassDescriptor = nullptr;
id <MTLRenderCommandEncoder> mtlRenderCommandEncoder = nullptr;
};

SdlMetalGlobals& GetSdlMetalGlobals();
#endif
}

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151 changes: 37 additions & 114 deletions src/hello_imgui/internal/backend_impls/rendering_metal.mm
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@

#define STB_IMAGE_IMPLEMENTATION
#include "hello_imgui/internal/stb_image.h"
#include "hello_imgui/hello_imgui.h"

#ifdef HELLOIMGUI_USE_SDL2
#include <SDL.h>
Expand All @@ -17,124 +18,42 @@

namespace HelloImGui
{
/*
//
// Init SDL
//
// Inform SDL that we will be using metal for rendering. Without this hint initialization of metal renderer may fail.
X SDL_SetHint(SDL_HINT_RENDER_DRIVER, "metal");
SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
if (renderer == nullptr)
{
printf("Error creating renderer: %s\n", SDL_GetError());
return -3;
}
//
// X Link SDL / Metal
//
// Setup Platform/Renderer backends
CAMetalLayer* layer = (__bridge CAMetalLayer*)SDL_RenderGetMetalLayer(renderer);
layer.pixelFormat = MTLPixelFormatBGRA8Unorm;
ImGui_ImplMetal_Init(layer.device);
ImGui_ImplSDL2_InitForMetal(window);
id<MTLCommandQueue> commandQueue = [layer.device newCommandQueue];
MTLRenderPassDescriptor* renderPassDescriptor = [MTLRenderPassDescriptor new];
//
// X New Frame + Clear color
//
int width, height;
SDL_GetRendererOutputSize(renderer, &width, &height);
layer.drawableSize = CGSizeMake(width, height);
id<CAMetalDrawable> drawable = [layer nextDrawable];
id<MTLCommandBuffer> commandBuffer = [commandQueue commandBuffer];
renderPassDescriptor.colorAttachments[0].clearColor = MTLClearColorMake(clear_color[0] * clear_color[3], clear_color[1] * clear_color[3], clear_color[2] * clear_color[3], clear_color[3]);
renderPassDescriptor.colorAttachments[0].texture = drawable.texture;
renderPassDescriptor.colorAttachments[0].loadAction = MTLLoadActionClear;
renderPassDescriptor.colorAttachments[0].storeAction = MTLStoreActionStore;
id <MTLRenderCommandEncoder> renderEncoder = [commandBuffer renderCommandEncoderWithDescriptor:renderPassDescriptor];
[renderEncoder pushDebugGroup:@"ImGui demo"];
// Start the Dear ImGui frame
ImGui_ImplMetal_NewFrame(renderPassDescriptor);
//
// RenderDrawDataTo3D
//
ImGui_ImplMetal_RenderDrawData(ImGui::GetDrawData(), commandBuffer, renderEncoder);
//
// Post UpdatePlatformWindows + RenderPlatformWindowsDefault
//
[renderEncoder popDebugGroup];
[renderEncoder endEncoding];
[commandBuffer presentDrawable:drawable];
[commandBuffer commit];
//
// ShutDown
//
X ImGui_ImplMetal_Shutdown();
*/

#ifdef HELLOIMGUI_USE_SDL2


struct SdlMetalGlobals
{
SDL_Window* window = nullptr;
SDL_Renderer* renderer = nullptr;
CAMetalLayer* layer = nullptr;
id<CAMetalDrawable> drawable = nullptr;
id<MTLCommandBuffer> commandBuffer = nullptr;
id<MTLCommandQueue> commandQueue = nullptr;
MTLRenderPassDescriptor* renderPassDescriptor = nullptr;
id <MTLRenderCommandEncoder> renderEncoder = nullptr;
ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
};

SdlMetalGlobals gSdlMetalGlobals;

void PrepareSdLForMetal_WithWindow_PreImGuiInit(SDL_Window* window)
void PrepareSdLForMetal_WithWindow_PreImGuiInit(SDL_Window* sdlWindow)
{
gSdlMetalGlobals.window = window;
gSdlMetalGlobals.renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
if (gSdlMetalGlobals.renderer == nullptr)
gSdlMetalGlobals.sdlWindow = sdlWindow;
gSdlMetalGlobals.sdlRenderer = SDL_CreateRenderer(sdlWindow, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
if (gSdlMetalGlobals.sdlRenderer == nullptr)
{
bool Error_SdlCreateRenderer_For_Metal = false;
IM_ASSERT(Error_SdlCreateRenderer_For_Metal);
exit(-3);
}

// Setup Platform/Renderer backends
gSdlMetalGlobals.layer = (__bridge CAMetalLayer*)SDL_RenderGetMetalLayer(gSdlMetalGlobals.renderer);
gSdlMetalGlobals.layer.pixelFormat = MTLPixelFormatBGRA8Unorm;
gSdlMetalGlobals.caMetalLayer = (__bridge CAMetalLayer*)SDL_RenderGetMetalLayer(gSdlMetalGlobals.sdlRenderer);
gSdlMetalGlobals.caMetalLayer.pixelFormat = MTLPixelFormatBGRA8Unorm;
}

void PrepareSdLForMetal_PosImGuiInit()
{
ImGui_ImplMetal_Init(gSdlMetalGlobals.layer.device);
ImGui_ImplSDL2_InitForMetal(gSdlMetalGlobals.window);
ImGui_ImplMetal_Init(gSdlMetalGlobals.caMetalLayer.device);
ImGui_ImplSDL2_InitForMetal(gSdlMetalGlobals.sdlWindow);

gSdlMetalGlobals.commandQueue = [gSdlMetalGlobals.layer.device newCommandQueue];
gSdlMetalGlobals.renderPassDescriptor = [MTLRenderPassDescriptor new];
gSdlMetalGlobals.mtlCommandQueue = [gSdlMetalGlobals.caMetalLayer.device newCommandQueue];
gSdlMetalGlobals.mtlRenderPassDescriptor = [MTLRenderPassDescriptor new];
}

void SwapSdlMetalBuffers()
{
[gSdlMetalGlobals.renderEncoder popDebugGroup];
[gSdlMetalGlobals.renderEncoder endEncoding];
[gSdlMetalGlobals.mtlRenderCommandEncoder popDebugGroup];
[gSdlMetalGlobals.mtlRenderCommandEncoder endEncoding];

[gSdlMetalGlobals.commandBuffer presentDrawable:gSdlMetalGlobals.drawable];
[gSdlMetalGlobals.commandBuffer commit];
[gSdlMetalGlobals.mtlCommandBuffer presentDrawable:gSdlMetalGlobals.caMetalDrawable];
[gSdlMetalGlobals.mtlCommandBuffer commit];
}

RenderingCallbacks CreateBackendCallbacks_Metal()
Expand All @@ -149,35 +68,33 @@ RenderingCallbacks CreateBackendCallbacks_Metal()
// New Frame + Clear color
//
int width, height;
SDL_GetRendererOutputSize(gSdlMetalGlobals.renderer, &width, &height);
gSdlMetalGlobals.layer.drawableSize = CGSizeMake(width, height);
gSdlMetalGlobals.drawable = [gSdlMetalGlobals.layer nextDrawable];

gSdlMetalGlobals.commandBuffer = [gSdlMetalGlobals.commandQueue commandBuffer];
auto clear_color = Vec4_To_Array(gSdlMetalGlobals.clear_color);
gSdlMetalGlobals.renderPassDescriptor.colorAttachments[0].clearColor = MTLClearColorMake(clear_color[0] * clear_color[3], clear_color[1] * clear_color[3], clear_color[2] * clear_color[3], clear_color[3]);
gSdlMetalGlobals.renderPassDescriptor.colorAttachments[0].texture = gSdlMetalGlobals.drawable.texture;
gSdlMetalGlobals.renderPassDescriptor.colorAttachments[0].loadAction = MTLLoadActionClear;
gSdlMetalGlobals.renderPassDescriptor.colorAttachments[0].storeAction = MTLStoreActionStore;
gSdlMetalGlobals.renderEncoder = [gSdlMetalGlobals.commandBuffer renderCommandEncoderWithDescriptor:gSdlMetalGlobals.renderPassDescriptor];
[gSdlMetalGlobals.renderEncoder pushDebugGroup:@"ImGui demo"];
SDL_GetRendererOutputSize(gSdlMetalGlobals.sdlRenderer, &width, &height);
gSdlMetalGlobals.caMetalLayer.drawableSize = CGSizeMake(width, height);
gSdlMetalGlobals.caMetalDrawable = [gSdlMetalGlobals.caMetalLayer nextDrawable];

gSdlMetalGlobals.mtlCommandBuffer = [gSdlMetalGlobals.mtlCommandQueue commandBuffer];
auto clearColor = Vec4_To_Array(HelloImGui::GetRunnerParams()->imGuiWindowParams.backgroundColor);
gSdlMetalGlobals.mtlRenderPassDescriptor.colorAttachments[0].clearColor = MTLClearColorMake(clearColor[0] * clearColor[3], clearColor[1] * clearColor[3], clearColor[2] * clearColor[3], clearColor[3]);
gSdlMetalGlobals.mtlRenderPassDescriptor.colorAttachments[0].texture = gSdlMetalGlobals.caMetalDrawable.texture;
gSdlMetalGlobals.mtlRenderPassDescriptor.colorAttachments[0].loadAction = MTLLoadActionClear;
gSdlMetalGlobals.mtlRenderPassDescriptor.colorAttachments[0].storeAction = MTLStoreActionStore;
gSdlMetalGlobals.mtlRenderCommandEncoder = [gSdlMetalGlobals.mtlCommandBuffer renderCommandEncoderWithDescriptor:gSdlMetalGlobals.mtlRenderPassDescriptor];
[gSdlMetalGlobals.mtlRenderCommandEncoder pushDebugGroup:@"ImGui demo"];

// Start the Dear ImGui frame
ImGui_ImplMetal_NewFrame(gSdlMetalGlobals.renderPassDescriptor);
ImGui_ImplMetal_NewFrame(gSdlMetalGlobals.mtlRenderPassDescriptor);
};

callbacks.Impl_RenderDrawData_To_3D = []
{
ImGui_ImplMetal_RenderDrawData(ImGui::GetDrawData(), gSdlMetalGlobals.commandBuffer, gSdlMetalGlobals.renderEncoder);
ImGui_ImplMetal_RenderDrawData(ImGui::GetDrawData(), gSdlMetalGlobals.mtlCommandBuffer, gSdlMetalGlobals.mtlRenderCommandEncoder);
};

// Not implemented for Metal
//callbacks.Impl_ScreenshotRgb = []() { ...;};

callbacks.Impl_Frame_3D_ClearColor = [](ImVec4 clear_color)
{
gSdlMetalGlobals.clear_color = clear_color;
};
// This is done at Impl_NewFrame_3D
callbacks.Impl_Frame_3D_ClearColor = [](ImVec4 clearColor) { };

callbacks.Impl_Shutdown_3D = []
{
Expand All @@ -186,6 +103,12 @@ RenderingCallbacks CreateBackendCallbacks_Metal()
return callbacks;
}

SdlMetalGlobals& GetSdlMetalGlobals()
{
return gSdlMetalGlobals;
}


#endif // #ifdef HELLOIMGUI_USE_SDL2


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