CentOS 7.0 - man page for gldepthrange (centos section 3G)
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GLDEPTHRANGE(3G) OpenGL Manual GLDEPTHRANGE(3G)
glDepthRange - specify mapping of depth values from normalized device coordinates to
void glDepthRange(GLdouble nearVal, GLdouble farVal);
void glDepthRangef(GLfloat nearVal, GLfloat farVal);
Specifies the mapping of the near clipping plane to window coordinates. The initial
value is 0.
Specifies the mapping of the far clipping plane to window coordinates. The initial
value is 1.
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.
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.
glGet() with argument GL_DEPTH_RANGE
glDepthFunc(), glPolygonOffset(), glViewport(), removedTypes()
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/.
opengl.org 06/10/2014 GLDEPTHRANGE(3G)
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