'\" t
.\"     Title: glDepthRange
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: 05/21/2015
.\"    Manual: [FIXME: manual]
.\"    Source: [FIXME: source]
.\"  Language: English
.\"
.TH "GLDEPTHRANGE" "3G" "05/21/2015" "[FIXME: source]" "[FIXME: manual]"
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.SH "NAME"
glDepthRange \- specify mapping of depth values from normalized device coordinates to window coordinates
.SH "C SPECIFICATION"
.HP \w'void\ glDepthRange('u
.BI "void glDepthRange(GLdouble\ " "nearVal" ", GLdouble\ " "farVal" ");"
.HP \w'void\ glDepthRangef('u
.BI "void glDepthRangef(GLfloat\ " "nearVal" ", GLfloat\ " "farVal" ");"
.SH "PARAMETERS"
.PP
\fInearVal\fR
.RS 4
Specifies the mapping of the near clipping plane to window coordinates\&. The initial value is 0\&.
.RE
.PP
\fIfarVal\fR
.RS 4
Specifies the mapping of the far clipping plane to window coordinates\&. The initial value is 1\&.
.RE
.SH "DESCRIPTION"
.PP
After clipping and division by
\fIw\fR, depth coordinates range from
\-1
to 1, corresponding to the near and far clipping planes\&.
\fBglDepthRange\fR
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
\fBglDepthRange\fR
are both clamped to this range before they are accepted\&.
.PP
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\&.
.SH "NOTES"
.PP
It is not necessary that
\fInearVal\fR
be less than
\fIfarVal\fR\&. Reverse mappings such as
nearVal = 1, and
farVal = 0
are acceptable\&.
.PP
The type of the
\fInearVal\fR
and
\fIfarVal\fR
parameters was changed from GLclampf to GLfloat for
\fBglDepthRangef\fR
and from GLclampd to GLdouble for
\fBglDepthRange\fR\&. This change is transparent to user code and is described in detail on the
\fBremovedTypes\fR()
page\&.
.SH "ASSOCIATED GETS"
.PP
\fBglGet\fR()
with argument
\fBGL_DEPTH_RANGE\fR
.SH "VERSION SUPPORT"
.TS
allbox tab(:);
lB cB s s s s s s s s s s s
lB cB cB cB cB cB cB cB cB cB cB cB cB.
T{

T}:T{
\fBOpenGL Version\fR
T}
T{
\fBFunction / Feature Name\fR
T}:T{
\fB2\&.0\fR
T}:T{
\fB2\&.1\fR
T}:T{
\fB3\&.0\fR
T}:T{
\fB3\&.1\fR
T}:T{
\fB3\&.2\fR
T}:T{
\fB3\&.3\fR
T}:T{
\fB4\&.0\fR
T}:T{
\fB4\&.1\fR
T}:T{
\fB4\&.2\fR
T}:T{
\fB4\&.3\fR
T}:T{
\fB4\&.4\fR
T}:T{
\fB4\&.5\fR
T}
.T&
l c c c c c c c c c c c c
l c c c c c c c c c c c c.
T{
\fBglDepthRange\fR
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}
T{
\fBglDepthRangef\fR
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}
.TE
.sp
.SH "SEE ALSO"
.PP
\fBglDepthFunc\fR(),
\fBglPolygonOffset\fR(),
\fBglViewport\fR(),
\fBremovedTypes\fR()
.SH "COPYRIGHT"
.PP
Copyright
\(co
1991\-2006 Silicon Graphics, Inc\&. Copyright
\(co
2010\-2014 Khronos Group\&. This document is licensed under the SGI Free Software B License\&. For details, see
\m[blue]\fBhttp://oss\&.sgi\&.com/projects/FreeB/\fR\m[]\&.
.SH "COPYRIGHT"
.br
Copyright \(co 1991-2006 Silicon Graphics, Inc.
.br
Copyright \(co 2010-2014 Khronos Group
.br