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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 © 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			  03/16/2013	       GLDEPTHRANGEINDEXED(3G)
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