金属渲染通道中没有颜色附件

Question

是否可以有一个MTLRenderPassDescriptor 渲染到深度或模板纹理，但没有颜色附件？像这样：

MTLRenderPassDescriptor* textureRenderPassDescriptor = [MTLRenderPassDescriptor renderPassDescriptor];
MTLRenderPassStencilAttachmentDescriptor* textureAttachment = [[MTLRenderPassStencilAttachmentDescriptor alloc]init];
textureAttachment.texture = texture;
textureAttachment.loadAction = MTLLoadActionClear;
textureAttachment.storeAction = MTLStoreActionStore;
textureRenderPassDescriptor.stencilAttachment = textureAttachment;

我尝试这样做，但在尝试使用此管道状态时出现以下错误：

failed assertion `For color attachment 0, the renderPipelineState pixelFormat must be MTLPixelFormatInvalid, as no texture is set.'

Answer 1

如断言所述，您需要在创建MTLRenderPipelineState 时将pixelFormat 设置为无效：

pipelineStateDescriptor.colorAttachments[0].pixelFormat = MTLPixelFormatInvalid;