在FBO中切换当前的GL_COLOR_ATTACMENT [英] Switching current GL_COLOR_ATTACMENT in FBO

问题描述

然后我们创建缓冲区对象，我们可以指定从0到N的许多颜色附件

Then we create buffer object we can specify many colour attachments from 0 to N

glBindFramebuffer(GL_FRAMEBUFFER, some_buffer);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,some_texture_0, 0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D,some_texture_1, 0);   

但是接下来我们要缓冲一下，如何控制我们在FBO中使用哪种颜色附件?(默认值为0)，还是多个颜色附件的工作方式不同?

But then we draw to buffer, how to control which colour attachment we use in FBO? (default is 0), or multiple colour attachments works different way?

glBindFramebuffer(GL_FRAMEBUFFER, some_buffer);
//draw something
//switch to colour_attachment1
//draw something
//switch back to colour_attacment0

推荐答案

glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D,some_texture_1, 0);

在OpenGL ES 2.0中不允许此行.至少不是没有

This line is not allowed in OpenGL ES 2.0. At least, not without extensions. OpenGL ES simply does not support having multiple color buffers. There is only GL_COLOR_ATTACHMENT0; nothing more than that.

因此，如果要绘制到一个缓冲区然后再绘制到另一个缓冲区，则需要绑定一个新的FBO.

So if you want to draw to one buffer then another, you need to bind a new FBO to do so.

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