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