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43 lines
1.2 KiB
Plaintext
43 lines
1.2 KiB
Plaintext
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/**
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* Objective-C++ implementation of the Cocoa bridge declared in
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* WgpuMetalSurface_mac.h. Compiled only on macOS.
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*/
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#include "WgpuMetalSurface_mac.h"
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#if defined(__APPLE__)
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#import <AppKit/NSView.h>
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#import <QuartzCore/CAMetalLayer.h>
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void* wgpu_macos_attach_metal_layer(void* nsview_ptr) {
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if (!nsview_ptr) {
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return nullptr;
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}
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NSView* view = (__bridge NSView*)nsview_ptr;
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// When QWindow::surfaceType is QSurface::MetalSurface, Qt already
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// backs the NSView with a CAMetalLayer — just hand it back. Otherwise
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// attach one ourselves (defensive: Qt's behaviour can change between
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// major versions and 6.x has occasionally regressed this).
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CAMetalLayer* layer = nil;
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if ([view.layer isKindOfClass:[CAMetalLayer class]]) {
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layer = (CAMetalLayer*)view.layer;
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} else {
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layer = [CAMetalLayer layer];
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view.wantsLayer = YES;
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view.layer = layer;
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}
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// Track the screen's backing scale so we get retina-resolution
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// drawables. wgpu's surface configure picks the drawable size up
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// from layer.drawableSize at present-time.
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if (view.window) {
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layer.contentsScale = view.window.backingScaleFactor;
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}
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return (__bridge void*)layer;
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}
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#endif // __APPLE__
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