在FBO中切换当前的GL_COLOR_ATTACMENT

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 扩展名. OpenGL ES根本不支持具有多个颜色缓冲区.只有GL_COLOR_ATTACHMENT0；没什么.

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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