%mathent; ]> 1991-2006 Silicon Graphics, Inc. 2010-2014 Khronos Group glReadBuffer 3G glReadBuffer select a color buffer source for pixels void glReadBuffer GLenum mode mode Specifies a color buffer. Accepted values are GL_BACK, GL_NONE, and GL_COLOR_ATTACHMENTi. glReadBuffer specifies a color buffer as the source for subsequent glReadPixels, , glCopyTexImage2D, glCopyTexSubImage2D, and glCopyTexSubImage3D commands. mode accepts one of the following values: GL_NONE, GL_BACK names the back buffer of the default framebuffer, and GL_COLOR_ATTACHMENTi names a color attachment of the current framebuffer, GL_INVALID_ENUM is generated if mode is not GL_BACK, GL_NONE, or GL_COLOR_ATTACHMENTi, where i is less than GL_MAX_COLOR_ATTACHMENTS. GL_INVALID_OPERATION is generated if the current framebuffer is the default framebufer and mode is not GL_NONE or GL_BACK. GL_INVALID_OPERATION is generated if the current framebuffer is a named framebufer and mode is not GL_NONE or GL_COLOR_ATTACHMENTi. glGet with argument GL_READ_BUFFER glReadBuffer glCopyTexImage2D, glCopyTexSubImage2D, glCopyTexSubImage3D, glDrawBuffers, glReadPixels Copyright 1991-2006 Silicon Graphics, Inc. Copyright 2010-2014 Khronos Group. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.