GLDRAWBUFFER(3G) GLDRAWBUFFER(3G)

glDrawBuffer - specify which color buffers are to be drawn into

void glDrawBuffer( GLenum 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.










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 buffer is written.

  

  
Only the front right color buffer is written.

  

  
Only the back left color buffer is written.

  

  
Only the back right color buffer 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 buffers 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 buffer, 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 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.

  

  
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.








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








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.








glGet with argument GL_DRAW_BUFFER
  

  glGet with argument GL_AUX_BUFFERS








glBlendFunc, glColorMask, glIndexMask,
    glLogicOp, glReadBuffer