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gldepthrange(3g) [osx man page]

GLDEPTHRANGE(3G)														  GLDEPTHRANGE(3G)

NAME
glDepthRange - specify mapping of depth values from normalized device coordinates to window coordinates C SPECIFICATION
void glDepthRange( GLclampd zNear, GLclampd zFar ) PARAMETERS
zNear Specifies the mapping of the near clipping plane to window coordinates. The initial value is 0. zFar 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 zNear be less than zFar. Reverse mappings such as zNear=1, and zFar=0 are acceptable. ERRORS
GL_INVALID_OPERATION is generated if glDepthRange is executed between the execution of glBegin and the corresponding execution of glEnd. ASSOCIATED GETS
glGet with argument GL_DEPTH_RANGE SEE ALSO
glDepthFunc, glPolygonOffset, glViewport GLDEPTHRANGE(3G)

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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 (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)
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