[Webkit-unassigned] [Bug 212013] Nonmappable buffers with createBufferMapped() doesn't work
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Mon May 18 17:02:47 PDT 2020
https://bugs.webkit.org/show_bug.cgi?id=212013
--- Comment #2 from Myles C. Maxfield <mmaxfield at apple.com> ---
If you copy/paste this into WebKit, it takes 11 seconds to complete. However, if you put it in a sample project, it takes less than 1 second to complete. Maybe the sandbox is interfering?
id<MTLDevice> device = MTLCreateSystemDefaultDevice();
MTLTextureDescriptor *textureDescriptor = [MTLTextureDescriptor new];
textureDescriptor.textureType = MTLTextureType2DArray;
textureDescriptor.pixelFormat = MTLPixelFormatRGBA8Unorm;
textureDescriptor.width = 512;
textureDescriptor.height = 512;
textureDescriptor.depth = 1;
textureDescriptor.mipmapLevelCount = 9;
textureDescriptor.sampleCount = 1;
textureDescriptor.arrayLength = 2;
textureDescriptor.storageMode = MTLStorageModePrivate;
textureDescriptor.usage = MTLTextureUsageShaderRead;
id<MTLTexture> texture = [device newTextureWithDescriptor:textureDescriptor];
id<MTLBuffer> buffer = [device newBufferWithLength:1048576 options:MTLStorageModeShared];
uint8_t* p = (uint8_t*)buffer.contents;
for (int i = 0; i < 512; ++i) {
for (int j = 0; j < 512; ++j) {
p[i * 512 * 4 + j * 4 + 0] = 0;
p[i * 512 * 4 + j * 4 + 1] = 255;
p[i * 512 * 4 + j * 4 + 2] = 0;
p[i * 512 * 4 + j * 4 + 3] = 255;
}
}
id<MTLCommandQueue> queue = [device newCommandQueue];
id<MTLCommandBuffer> commandBuffer = [queue commandBuffer];
id<MTLBlitCommandEncoder> commandEncoder = [commandBuffer blitCommandEncoder];
[commandEncoder copyFromBuffer:buffer sourceOffset:0 sourceBytesPerRow:2048 sourceBytesPerImage:1048576 sourceSize:MTLSizeMake(512, 512, 1) toTexture:texture destinationSlice:0 destinationLevel:0 destinationOrigin: MTLOriginMake(0, 0, 0)];
[commandEncoder endEncoding];
[commandBuffer addCompletedHandler:^(id<MTLCommandBuffer> commandBuffer) {
NSLog(@"Test Done.");
}];
NSLog(@"Test committing");
[commandBuffer commit];
[[NSRunLoop mainRunLoop] run];
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