FramebuffersGL 1.0
glReadBuffer
Chooses which color buffer is the source for read operations.
Signature
void glReadBuffer(GLenum src);
How it works
Affects glReadPixels, glBlitFramebuffer and glCopyTexSubImage. Like glDrawBuffer, it is set to GL_NONE on depth-only framebuffers so they are complete without a color attachment.
Parameters
srcGLenum
GL_NONE, GL_COLOR_ATTACHMENTi, or GL_BACK / GL_FRONT for the window.
Example
example.cpp
1glReadBuffer(GL_NONE);