Страницы справочника OS X

Эта страница руководства является частью версии 5.0 Инструментов XCode

Читать страницы руководства

GLREADBUFFER(3G)                                 OpenGL 3.3                                 GLREADBUFFER(3G)



NAME
       glReadBuffer - select a color buffer source for pixels

C SPECIFICATION
       void glReadBuffer(GLenum mode);

PARAMETERS
       mode
           Specifies a color buffer. Accepted values are GL_FRONT_LEFT, GL_FRONT_RIGHT, GL_BACK_LEFT,
           GL_BACK_RIGHT, GL_FRONT, GL_BACK, GL_LEFT, and GL_RIGHT.

DESCRIPTION
       glReadBuffer 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.

       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.

ERRORS
       GL_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.

ASSOCIATED GETS
       glGet() with argument GL_READ_BUFFER

SEE ALSO
       glCopyTexImage1D(), glCopyTexImage2D(), glCopyTexSubImage1D(), glCopyTexSubImage2D(),
       glCopyTexSubImage3D(), glDrawBuffer(), glReadPixels()


COPYRIGHT
       Copyright (C) 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software
       B License. For details, see http://oss.sgi.com/projects/FreeB/.



OpenGL 3.3                                       03/08/2011                                 GLREADBUFFER(3G)