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#define GPU_METAL 1
#ifdef GPU_METAL
#include <celeritas.h>
#define MTL_DEBUG_LAYER 1
// Obj-C imports
#import <Foundation/Foundation.h>
#import <Metal/Metal.h>
#import <MetalKit/MetalKit.h>
#import <QuartzCore/CAMetalLayer.h>
#define GLFW_INCLUDE_NONE
#import <GLFW/glfw3.h>
#define GLFW_EXPOSE_NATIVE_COCOA
#import <GLFW/glfw3native.h>
// --- RAL types
struct gpu_swapchain {
int width, height;
CAMetalLayer* swapchain;
};
typedef struct metal_context {
GLFWwindow* window;
NSWindow* metal_window;
id<MTLDevice> device;
id<CAMetalDrawable> surface;
gpu_swapchain default_swapchain;
id<MTLCommandQueue> command_queue;
} metal_context;
static metal_context ctx;
void ral_backend_init(const char* window_name, struct GLFWwindow* window) {
printf("loading Metal backend\n");
printf("gpu device creation\n");
const id<MTLDevice> gpu = MTLCreateSystemDefaultDevice();
ctx.device = gpu;
printf("window init\n");
glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
glfwMakeContextCurrent(window);
NSWindow* nswindow = glfwGetCocoaWindow(window);
ctx.metal_window = nswindow;
// effectively the "framebuffer"
CAMetalLayer* metal_layer = [CAMetalLayer layer];
metal_layer.device = gpu;
metal_layer.pixelFormat = MTLPixelFormatBGRA8Unorm;
ctx.metal_window.contentView.layer = metal_layer;
ctx.metal_window.contentView.wantsLayer = true;
printf("command queue creation\n");
const id<MTLCommandQueue> queue = [ctx.device newCommandQueue];
ctx.command_queue = queue;
}
void ral_backend_shutdown() {
// no-op
}
#endif
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