fglDrawBuffer man page on IRIX

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fglDrawBuffer(3G)	       OpenGL Reference		     fglDrawBuffer(3G)

NAME
     fglDrawBuffer - specify which color buffers are to be drawn into

FORTRAN SPECIFICATION
     SUBROUTINE fglDrawBuffer( INTEGER*4 mode )

PARAMETERS
     mode  Specifies up to four color buffers to be drawn into.	 Symbolic
	   constants GL_NONE, GL_FRONT_LEFT, GL_FRONT_RIGHT, GL_BACK_LEFT,
	   GL_BACK_RIGHT, GL_FRONT, GL_BACK, GL_LEFT, GL_RIGHT,
	   GL_FRONT_AND_BACK, and GL_AUXi, where i is between 0 and
	   ``GL_AUX_BUFFERS'' -1, are accepted (GL_AUX_BUFFERS is not the
	   upper limit; use fglGet to query the number of available aux
	   buffers.)  The initial value is GL_FRONT for single-buffered
	   contexts, and GL_BACK for double-buffered contexts.

DESCRIPTION
     When colors are written to the frame buffer, they are written into the
     color buffers specified by fglDrawBuffer.	The specifications are as
     follows:

     GL_NONE		      No color buffers are written.

     GL_FRONT_LEFT	      Only the front left color buffer is written.

     GL_FRONT_RIGHT	      Only the front right color buffer is written.

     GL_BACK_LEFT	      Only the back left color buffer is written.

     GL_BACK_RIGHT	      Only the back right color buffer is written.

     GL_FRONT		      Only the front left and front right color
			      buffers are written.  If there is no front right
			      color buffer, only the front left color buffer
			      is written.

     GL_BACK		      Only the back left and back right color buffers
			      are written.  If there is no back right color
			      buffer, only the back left color buffer is
			      written.

     GL_LEFT		      Only the front left and back left color buffers
			      are written.  If there is no back left color
			      buffer, only the front left color buffer is
			      written.

     GL_RIGHT		      Only the front right and back right color
			      buffers are written.  If there is no back right
			      color buffer, only the front right color buffer
			      is written.

									Page 1

fglDrawBuffer(3G)	       OpenGL Reference		     fglDrawBuffer(3G)

     GL_FRONT_AND_BACK	      All the front and back color buffers (front
			      left, front right, back left, back right) are
			      written.	If there are no back color buffers,
			      only the front left and front right color
			      buffers are written.  If there are no right
			      color buffers, only the front left and back left
			      color buffers are written.  If there are no
			      right or back color buffers, only the front left
			      color buffer is written.

     GL_AUXi		      Only auxiliary color buffer i is written.

     If more than one color buffer is selected for drawing, then blending or
     logical operations are computed and applied independently for each color
     buffer and can produce different results in each buffer.

     Monoscopic contexts include only left buffers, and stereoscopic contexts
     include both left and right buffers.  Likewise, single-buffered contexts
     include only front buffers, and double-buffered contexts include both
     front and back buffers.  The context is selected at GL initialization.

NOTES
     It is always the case that GL_AUXi = GL_AUX0 + i.

ERRORS
     GL_INVALID_ENUM is generated if mode is not an accepted value.

     GL_INVALID_OPERATION is generated if none of the buffers indicated by
     mode exists.

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

ASSOCIATED GETS
     fglGet with argument GL_DRAW_BUFFER
     fglGet with argument GL_AUX_BUFFERS

SEE ALSO
     fglBlendFunc, fglColorMask, fglIndexMask, fglLogicOp, fglReadBuffer

									Page 2

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