我想使用 Apple Metal 渲染路径来处理 CVPixelBuffer。
如何转换 CVPixelBuffer 使其符合顶点着色器的输入? 不知道如何从 CVPixelBuffer 中提取颜色/位置值,以便我可以从主机设置它们。
这是我用来将 CVPixelBuffer 数据转换为 Metal 纹理的代码。
#pragma mark - AVCaptureVideoDataOutputSampleBufferDelegate
- (void)captureOutputAVCaptureOutput *)captureOutput didOutputSampleBufferCMSampleBufferRef)sampleBuffer fromConnectionAVCaptureConnection *)connection
{
CVPixelBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
id<MTLTexture> texture = nil;
{
size_t width = CVPixelBufferGetWidth(pixelBuffer);
size_t height = CVPixelBufferGetHeight(pixelBuffer);
MTLPixelFormat pixelFormat = MTLPixelFormatBGRA8Unorm;
CVMetalTextureRef metalTextureRef = NULL;
CVReturn status = CVMetalTextureCacheCreateTextureFromImage(NULL, _textureCache, pixelBuffer, NULL, pixelFormat, width, height, 0, &metalTextureRef);
if(status == kCVReturnSuccess)
{
texture = CVMetalTextureGetTexture(metalTextureRef);
if (self.delegate){
[self.delegate textureUpdated:texture];
}
CFRelease(metalTextureRef);
}
}
}
获得纹理后,只需将其传递给 renderCommandEncoder。如果您需要这方面的帮助,请在评论中告诉我。
关于ios - 如何将 CVPixelBuffer 设置为顶点着色器的输入?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/26568409/
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