glRenderMode man page on RedHat
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GLRENDERMODE(3G) OpenGL Manual GLRENDERMODE(3G)
NAME
glRenderMode - set rasterization mode
C SPECIFICATION
GLint 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
current render mode.
ERRORS
GL_INVALID_ENUM is generated if mode is not one of the three accepted
values.
GL_INVALID_OPERATION is generated if glSelectBuffer() is called while
the render mode is GL_SELECT, or if glRenderMode is called with
argument GL_SELECT before glSelectBuffer() is called at least once.
GL_INVALID_OPERATION is generated if glFeedbackBuffer() is called while
the render mode is GL_FEEDBACK, or if glRenderMode is called with
argument GL_FEEDBACK before glFeedbackBuffer() is called at least once.
GL_INVALID_OPERATION is generated if glRenderMode is executed between
the execution of glBegin() and the corresponding execution of glEnd().
ASSOCIATED GETS
glGet() with argument GL_RENDER_MODE
SEE ALSO
glFeedbackBuffer(), glInitNames(), glLoadName(), glPassThrough(),
glPushName(), glSelectBuffer()
COPYRIGHT
Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
under the SGI Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/.
AUTHORS
opengl.org
opengl.org 03/16/2013 GLRENDERMODE(3G)
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