C SPECIFICATION

       GLint GLAPIENTRY glRenderMode( GLenum mode )

PARAMETERS

       mode  Specifies  the  rasterization  mode.   Three values are accepted:
             GL_RENDER, GL_SELECT, and  GL_FEEDBACK.   The  initial  value  is
             GL_RENDER.

DESCRIPTION

       glRenderMode sets the rasterization mode.  It takes one argument, mode,
       which can assume one of three predefined values:

       GL_RENDER       Render mode. Primitives are rasterized, producing pixel
                       fragments,  which  are  written  into the frame buffer.
                       This is the normal mode and also the default mode.

       GL_SELECT       Selection mode.  No pixel fragments are  produced,  and
                       no  change  to  the  frame  buffer  contents  is  made.
                       Instead, a record of the names of primitives that would
                       have  been  drawn if the render mode had been GL_RENDER
                       is returned in a select buffer, which must  be  created
                       (see  glSelectBuffer) before selection mode is entered.

       GL_FEEDBACK     Feedback mode.  No pixel fragments are produced, and no
                       change  to the frame buffer contents is made.  Instead,
                       the coordinates and attributes of vertices  that  would
                       have  been  drawn if the render mode had been GL_RENDER
                       is returned in a feedback buffer, which must be created
                       (see glFeedbackBuffer) before feedback mode is entered.

       The return value of glRenderMode is determined by the  render  mode  at
       the  time  glRenderMode  is  called,  rather  than by mode.  The values
       returned for the three render modes are as follows:

       GL_RENDER       0.

       GL_SELECT       The number of hit records  transferred  to  the  select
                       buffer.

       GL_FEEDBACK     The  number of values (not vertices) transferred to the
                       feedback buffer.

       See the glSelectBuffer and glFeedbackBuffer reference  pages  for  more
       details concerning selection and feedback operation.

NOTES

       If an error is generated, glRenderMode returns 0 regardless of the cur-
       rent render mode.

ERRORS

ASSOCIATED GETS

       glGet with argument GL_RENDER_MODE

SEE ALSO

       glFeedbackBuffer, glInitNames, glLoadName,  glPassThrough,  glPushName,
       glSelectBuffer



                                                              GLRENDERMODE(3G)