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Ensure that the CAMetalLayer FBO attachments can be read from. (#13643)

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By default, the CAMetalLayer backing store is a framebuffer attachment that is
only optimized for display. However, effects such as backdrop filters require
renderbuffer readback. Making this calls will result in exceptions. Disable the
write only optimization on such backing store.

Fixes https://github.com/flutter/flutter/issues/43555
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Chinmay Garde 2019-11-04 17:28:51 -08:00 committed by GitHub
parent fe0838e948
commit 7b968ff95f
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shell/gpu/gpu_surface_metal.mm
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@ -23,6 +23,9 @@ GPUSurfaceMetal::GPUSurfaceMetal(GPUSurfaceDelegate* delegate,
}
layer.get().pixelFormat = MTLPixelFormatBGRA8Unorm;
// Flutter needs to read from the color attachment in cases where there are effects such as
// backdrop filters.
layer.get().framebufferOnly = NO;
auto metal_device = fml::scoped_nsprotocol<id<MTLDevice>>([layer_.get().device retain]);
auto metal_queue = fml::scoped_nsprotocol<id<MTLCommandQueue>>([metal_device newCommandQueue]);