2003-2004
Silicon Graphics, Inc.
glDepthRange
3G
glDepthRange
glDepthRangef
glDepthRangex
specify mapping of depth values from normalized
device coordinates to window coordinates
C Specification
void glDepthRangef
GLclampf near
GLclampf far
void glDepthRangex
GLclampx near
GLclampx far
Parameters
near
Specifies the mapping of the near clipping plane to
window coordinates. The initial value is 0.
far
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 near
be less than far.
Reverse mappings such as
near
=
1
,
and
far
=
0
are acceptable.
See Also
glDepthFunc,
glPolygonOffset,
glViewport
Copyright
Copyright 2003-2004
Silicon Graphics, Inc. This document is licensed under the SGI
Free Software B License. For details, see
https://khronos.org/registry/OpenGL-Refpages/LICENSES/LicenseRef-FreeB.txt.