centos man page for gldepthrange

GLDEPTHRANGE(3G)						   OpenGL Manual						  GLDEPTHRANGE(3G)

NAME
       glDepthRange - specify mapping of depth values from normalized device coordinates to window coordinates

C SPECIFICATION
       void glDepthRange(GLdouble nearVal, GLdouble farVal);

       void glDepthRangef(GLfloat nearVal, GLfloat farVal);

PARAMETERS
       nearVal
	   Specifies the mapping of the near clipping plane to window coordinates. The initial value is 0.

       farVal
	   Specifies the mapping of the far clipping plane to window coordinates. The initial value is 1.

DESCRIPTION
       After clipping and division by w, depth coordinates range from -1 to 1, corresponding to the near and far clipping planes.  glDepthRange
       specifies a linear mapping of the normalized depth coordinates in this range to window depth coordinates. Regardless of the actual depth
       buffer implementation, window coordinate depth values are treated as though they range from 0 through 1 (like color components). Thus, the
       values accepted by glDepthRange are both clamped to this range before they are accepted.

       The setting of (0,1) maps the near plane to 0 and the far plane to 1. With this mapping, the depth buffer range is fully utilized.

NOTES
       It is not necessary that nearVal be less than farVal. Reverse mappings such as nearVal = 1, and farVal = 0 are acceptable.

       The type of the nearVal and farVal parameters was changed from GLclampf to GLfloat for glDepthRangef and from GLclampd to GLdouble for
       glDepthRange. This change is transparent to user code and is described in detail on the removedTypes() page.

ASSOCIATED GETS
       glGet() with argument GL_DEPTH_RANGE

SEE ALSO
       glDepthFunc(), glPolygonOffset(), glViewport(), removedTypes()

COPYRIGHT
       Copyright (C) 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							    06/10/2014							  GLDEPTHRANGE(3G)