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/

10-11 07:52