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GLDEPTHRANGEINDEXED(3G) 		  OpenGL Manual 		  GLDEPTHRANGEINDEXED(3G)

NAME
       glDepthRangeIndexed - specify mapping of depth values from normalized device coordinates
       to window coordinates for a specified viewport

C SPECIFICATION
       void glDepthRangeIndexed(GLuint index, GLdouble nearVal, GLdouble farVal);

PARAMETERS
       index
	   Specifies the index of the viewport whose depth range to update.

       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. Each viewport has an independent depth range specified
       as 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).
       glDepthRangeIndexed specifies a linear mapping of the normalized depth coordinates in this
       range to window depth coordinates for a specified viewport. Thus, the values accepted by
       glDepthRangeIndexed are both clamped to this range before they are accepted.

       The index parameter specifies the index of first viewport whose depth range to modify and
       must be less than the value of GL_MAX_VIEWPORTS.  nearVal and farVal specify near and far
       values of the depth range for the specified viewport, respectively.

       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 the near plane distance be less than the far plane distance.
       Reverse mappings such as nearVal = 1, and farVal = 0 are acceptable.

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

ERRORS
       GL_INVALID_VALUE is generated if index is greater than or equal to the value of
       GL_MAX_VIEWPORTS.

ASSOCIATED GETS
       glGet() with argument GL_DEPTH_RANGE

SEE ALSO
       glDepthFunc(), glDepthRange(), glDepthRangeArray(), glPolygonOffset(), glViewportArray(),
       glViewport(), removedTypes()

COPYRIGHT
       Copyright (C) 2010 Khronos Group. This material may be distributed subject to the terms
       and conditions set forth in the Open Publication License, v 1.0, 8 June 1999.
       http://opencontent.org/openpub/.

AUTHORS
       opengl.org

opengl.org				    06/10/2014			  GLDEPTHRANGEINDEXED(3G)
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