glDrawBuffer man page on Tru64

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glDrawBuffer(3G)					      glDrawBuffer(3G)

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

SYNOPSIS
       void glDrawBuffer(
	       GLenum mode );

PARAMETERS
       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 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 glDrawBuffer(). The  specifications  are  as
       follows:	 No color buffers are written.	Only the front left color buf‐
       fer is written.	Only the front right color buffer  is  written.	  Only
       the  back left color buffer is written.	Only the back right color buf‐
       fer is written.	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.	 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.  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.  Only  the  front  right  and  back
       right  color  buffers are written. If there is no back right color buf‐
       fer, only the front right color buffer is written.  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 buf‐
       fers, 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.  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 ini‐
       tialization.

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(3), glColorMask(3), glIndexMask(3),	glLogicOp(3),  glRead‐
       Buffer

							      glDrawBuffer(3G)
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