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Minimal C GLFW Metal example
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| // | |
| // cc glfw-metal-example.m `pkg-config --cflags --libs glfw3` -framework AppKit -framework Metal -framework QuartzCore | |
| // | |
| #define GLFW_INCLUDE_NONE | |
| #define GLFW_EXPOSE_NATIVE_COCOA | |
| #include <GLFW/glfw3.h> | |
| #include <GLFW/glfw3native.h> | |
| #import <Metal/Metal.h> | |
| #import <QuartzCore/CAMetalLayer.h> | |
| static void quit(GLFWwindow *window, int key, int scancode, int action, int mods) | |
| { | |
| if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS) { | |
| glfwSetWindowShouldClose(window, GLFW_TRUE); | |
| } | |
| } | |
| int main(void) | |
| { | |
| const id<MTLDevice> gpu = MTLCreateSystemDefaultDevice(); | |
| const id<MTLCommandQueue> queue = [gpu newCommandQueue]; | |
| CAMetalLayer *swapchain = [CAMetalLayer layer]; | |
| swapchain.device = gpu; | |
| swapchain.opaque = YES; | |
| glfwInit(); | |
| glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API); | |
| GLFWwindow *window = glfwCreateWindow(640, 480, "GLFW Metal", NULL, NULL); | |
| NSWindow *nswindow = glfwGetCocoaWindow(window); | |
| nswindow.contentView.layer = swapchain; | |
| nswindow.contentView.wantsLayer = YES; | |
| glfwSetKeyCallback(window, quit); | |
| MTLClearColor color = MTLClearColorMake(0, 0, 0, 1); | |
| while (!glfwWindowShouldClose(window)) { | |
| glfwPollEvents(); | |
| @autoreleasepool { | |
| color.red = (color.red > 1.0) ? 0 : color.red + 0.01; | |
| id<CAMetalDrawable> surface = [swapchain nextDrawable]; | |
| MTLRenderPassDescriptor *pass = [MTLRenderPassDescriptor renderPassDescriptor]; | |
| pass.colorAttachments[0].clearColor = color; | |
| pass.colorAttachments[0].loadAction = MTLLoadActionClear; | |
| pass.colorAttachments[0].storeAction = MTLStoreActionStore; | |
| pass.colorAttachments[0].texture = surface.texture; | |
| id<MTLCommandBuffer> buffer = [queue commandBuffer]; | |
| id<MTLRenderCommandEncoder> encoder = [buffer renderCommandEncoderWithDescriptor:pass]; | |
| [encoder endEncoding]; | |
| [buffer presentDrawable:surface]; | |
| [buffer commit]; | |
| } | |
| } | |
| glfwDestroyWindow(window); | |
| glfwTerminate(); | |
| return 0; | |
| } |
Not sure if pkg-config is generally available in OS X builds. From brew, lib and include needs to be specified.
cc glfw-metal-example.m -L/opt/homebrew/Cellar/glfw/3.3.9/lib -I/opt/homebrew/Cellar/glfw/3.3.9/include -lglfw -framework AppKit -framework Metal -framework QuartzCore
If you don't want to use pkg-config, here is how I built it with Bazel: https://github.com/louwers/metal-glfw
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Thanks for sharing this! To handle window resizing, the
CAMetalLayer.drawableSizeshould be updated so it matchesglfwGetFramebufferSize()before fetching thenextDrawable.