Index for Section 3G

Alphabetical listing for G

Bottom of page

glDrawBuffer(3G)
NAME
  glDrawBuffer - specify which color buffers are to be drawn into

SYNOPSIS
  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 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:

  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.

  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 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), glReadBuffer

Index for Section 3G

Alphabetical listing for G

Top of page