ios - 如何将 CVPixelBuffer 设置为顶点着色器的输入？
<p><p>我想使用 Apple Metal 渲染路径来处理 CVPixelBuffer。</p>
<p>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。</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>这是我用来将 CVPixelBuffer 数据转换为 Metal 纹理的代码。</p>
<pre><code>#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){
;
}
CFRelease(metalTextureRef);
}
}
}
</code></pre>
<p>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。</p></p>
<p style="font-size: 20px;">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：
<a href="https://stackoverflow.com/questions/26568409/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/26568409/
</a>
</p>
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