如何将深度缓冲区复制到GPU上的纹理? [英] How to copy depth buffer to a texture on the GPU?

问题描述

我想将当前深度缓冲区获取到纹理，以在着色器中对其进行访问.由于种种原因，我无法进行单独的深度传递，但是需要复制已经渲染的深度.

I want to get the current depth buffer to a texture, to access it in a shader. For various reasons I can't do a separate depth pass, but would need to copy the already-rendered depth.

glReadPixels会占用CPU并可能会破坏性能，据我所知，glBlitFramebuffer不能只对深度进行颜色转换，而只能对深度进行转换.

glReadPixels would involve the CPU and potentially kill performance, and as far as I know glBlitFramebuffer can't blit depth-to-color, only depth-to-depth.

如何在GPU上执行此操作?

How to do this on the GPU?

推荐答案

执行此操作的现代方法是使用FBO.将颜色和深度纹理附加到其上，进行渲染，然后禁用FBO，并将这些纹理用作着色器的输入，该着色器将渲染到默认的帧缓冲区.

The modern way of doing this would be to use a FBO. Attach a color and depth texture to it, render, then disable the FBO and use the textures as inputs to a shader that will render to the default framebuffer.

您需要的有关FBO的所有详细信息可以在此处找到.

All the details you need about FBO can be found here.

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