Section : 3G Updated : 01/20/2022 Source : [FIXME: source] Note : [FIXME: manual] NAMEglReadBuffer, glNamedFramebufferReadBuffer − select a color buffer source for pixels C SPECIFICATIONvoid glReadBuffer(GLenum mode);void glNamedFramebufferReadBuffer(GLuint framebuffer, GLenum mode);PARAMETERSframebufferSpecifies the name of the framebuffer object for glNamedFramebufferReadBuffer function. modeSpecifies a color buffer. Accepted values are GL_FRONT_LEFT, GL_FRONT_RIGHT, GL_BACK_LEFT, GL_BACK_RIGHT, GL_FRONT, GL_BACK, GL_LEFT, GL_RIGHT, and the constants GL_COLOR_ATTACHMENTi. DESCRIPTIONglReadBuffer specifies a color buffer as the source for subsequent glReadPixels(), glCopyTexImage1D(), glCopyTexImage2D(), glCopyTexSubImage1D(), glCopyTexSubImage2D(), and glCopyTexSubImage3D() commands. mode accepts one of twelve or more predefined values. 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. Further more, the constants GL_COLOR_ATTACHMENTi may be used to indicate the ith color attachment where i ranges from zero to the value of GL_MAX_COLOR_ATTACHMENTS minus one. Nonstereo double−buffered configurations have only a front left and a back left buffer. Single−buffered configurations have a front left and a front right buffer if stereo, and only a front left buffer if nonstereo. It is an error to specify a nonexistent buffer to glReadBuffer. mode is initially GL_FRONT in single−buffered configurations and GL_BACK in double−buffered configurations. For glReadBuffer, the target framebuffer object is that bound to GL_READ_FRAMEBUFFER. For glNamedFramebufferReadBuffer, framebuffer must either be zero or the name of the target framebuffer object. If framebuffer is zero, then the default read framebuffer is affected. ERRORSGL_INVALID_ENUM is generated if mode is not one of the twelve (or more) accepted values. GL_INVALID_OPERATION is generated if mode specifies a buffer that does not exist. GL_INVALID_OPERATION is generated by glNamedFramebufferReadBuffer if framebuffer is not zero or the name of an existing framebuffer object. ASSOCIATED GETSglGet() with argument GL_READ_BUFFERVERSION SUPPORT
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