glDepthRangeIndexed - specify mapping of depth values from normalized device
coordinates to window coordinates for a specified viewport
void glDepthRangeIndexed(GLuint index,
Specifies the index of the viewport whose depth range to
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. 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.
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.
GL_INVALID_VALUE is generated if index is greater than or equal to
the value of GL_MAX_VIEWPORTS.
glGet() with argument GL_DEPTH_RANGE
glDepthFunc(), glDepthRange(), glDepthRangeArray(),
glPolygonOffset(), glViewportArray(), glViewport(),
Copyright © 2010-2014 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/.
Copyright © 2010-2014 Khronos Group
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