glDepthRange man page on Oracle

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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 © 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			  04/29/2014		      GLDEPTHRANGE(3G)
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