glDrawBuffer man page on Scientific

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GLDRAWBUFFER(3G)					      GLDRAWBUFFER(3G)

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

C SPECIFICATION
       void glDrawBuffer( GLenum 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 glGet to query the number of available aux buf‐
	     fers.)  The initial value is GL_FRONT  for	 single-buffered  con‐
	     texts, 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 glDrawBuffer.	  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 buf‐
				fers 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  buf‐
				fers  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 buf‐
				fers 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 buf‐
				fers  are  written.  If there is no back right
				color buffer, only the front right color  buf‐
				fer is written.

       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 buf‐
				fers 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 con‐
       texts 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 glDrawBuffer is  executed  between
       the execution of glBegin and the corresponding execution of glEnd.

ASSOCIATED GETS
       glGet with argument GL_DRAW_BUFFER
       glGet with argument GL_AUX_BUFFERS

SEE ALSO
       glBlendFunc(3G),	  glColorMask(3G),   glIndexMask(3G),	glLogicOp(3G),
       glReadBuffer(3G)

							      GLDRAWBUFFER(3G)
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