fglReadBuffer man page on IRIX

fglReadBuffer man page on IRIX

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fglReadBuffer(3G)	       OpenGL Reference		     fglReadBuffer(3G)

NAME
     fglReadBuffer - select a color buffer source for pixels

FORTRAN SPECIFICATION
     SUBROUTINE fglReadBuffer( INTEGER*4 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, GL_RIGHT, and GL_AUXi, where i is between 0 and
	   GL_AUX_BUFFERS -1.

DESCRIPTION
     fglReadBuffer specifies a color buffer as the source for subsequent
     fglReadPixels, fglCopyTexImage1D, fglCopyTexImage2D,
     fglCopyTexSubImage1D, fglCopyTexSubImage2D, fglCopyTexSubImage3D, and
     fglCopyPixels commands. mode 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 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 fglReadBuffer.

     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.

     GL_INVALID_OPERATION is generated if fglReadBuffer is executed between
     the execution of fglBegin and the corresponding execution of fglEnd.

ASSOCIATED GETS
     fglGet with argument GL_READ_BUFFER

SEE ALSO
     fglCopyPixels, fglCopyTexImage1D, fglCopyTexImage2D,
     fglCopyTexSubImage1D, fglCopyTexSubImage2D, fglCopyTexSubImage3D,
     fglDrawBuffer, fglReadPixels

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