Selects a color buffer source for pixels.
OpenGL C bindings library: libGL.a
void glReadBuffer(GLenum Mode)
| Mode | Specifies a color buffer. Accepted values are as follows: |
The glReadBuffer subroutine specifies a color buffer as the source for subsequent glReadPixels and glCopyPixels subroutines. The Mode parameter accepts one of twelve or more predefined values. (GL_AUX0 through GL_AUX3 are always defined.) In a fully configured system, GL_FRONT, GL_LEFT, and GL_FRONT_LEFT all name the front left buffer, GL_FRONT_RIGHT and GL_RIGHT name the front right buffer, and GL_BACK_LEFT and GL_BACK name the back left buffer. Nonstereo configurations have only a left buffer, or a front left and a back left buffer if double-buffered. Single-buffered configurations have only a front buffer, or a front left and a front right buffer if stereo. It is an error to specify a nonexistent buffer to glReadBuffer.
By default, the Mode parameter is GL_FRONT in single-buffered configurations and GL_BACK in double-buffered configurations.
Associated gets for the glReadBuffer subroutine are as follows. (See the glGet subroutine.)
glGet with argument GL_READ_BUFFER.
| /usr/include/GL/gl.h | Contains C language constants, variable type definitions, and ANSI function prototypes for OpenGL. |
The glBegin or glEnd subroutine, glCopyPixels subroutine, glDrawBuffer subroutine, glReadPixels subroutine.