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,因此我可以从主机进行设置。
最佳答案
这是我用来将CVPixelBuffer数据转换为Metal纹理的代码。
#pragma mark - AVCaptureVideoDataOutputSampleBufferDelegate
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)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/