GLDEPTHRANGEINDEXED man page on RedHat
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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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