src/dawn/glfw/utils_metal.mm

// Copyright 2020 The Dawn & Tint Authors
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#if !defined(DAWN_ENABLE_BACKEND_METAL)
#error "utils_metal.mm requires the Metal backend to be enabled."
#endif  // !defined(DAWN_ENABLE_BACKEND_METAL)

#include "webgpu/webgpu_glfw.h"

#import <QuartzCore/CAMetalLayer.h>
#include "GLFW/glfw3.h"

#include <cstdlib>

#define GLFW_EXPOSE_NATIVE_COCOA
#include "GLFW/glfw3native.h"

namespace wgpu::glfw {

std::unique_ptr<wgpu::ChainedStruct> SetupWindowAndGetSurfaceDescriptorCocoa(GLFWwindow* window) {
    @autoreleasepool {
        NSWindow* nsWindow = glfwGetCocoaWindow(window);
        NSView* view = [nsWindow contentView];

        // Create a CAMetalLayer that covers the whole window that will be passed to
        // CreateSurface.
        [view setWantsLayer:YES];
        [view setLayer:[CAMetalLayer layer]];

        // Use retina if the window was created with retina support.
        [[view layer] setContentsScale:[nsWindow backingScaleFactor]];

        std::unique_ptr<wgpu::SurfaceDescriptorFromMetalLayer> desc =
            std::make_unique<wgpu::SurfaceDescriptorFromMetalLayer>();
        desc->layer = [view layer];
        return std::move(desc);
    }
}

}  // namespace wgpu::glfw