'\" t
.\"     Title: glViewportIndexed
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 01/03/2018
.\"    Manual: [FIXME: manual]
.\"    Source: [FIXME: source]
.\"  Language: English
.\"
.TH "GLVIEWPORTINDEXED" "3G" "01/03/2018" "[FIXME: source]" "[FIXME: manual]"
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.SH "NAME"
glViewportIndexed \- set a specified viewport
.SH "C SPECIFICATION"
.HP \w'void\ glViewportIndexedf('u
.BI "void glViewportIndexedf(GLuint\ " "index" ", GLfloat\ " "x" ", GLfloat\ " "y" ", GLfloat\ " "w" ", GLfloat\ " "h" ");"
.HP \w'void\ glViewportIndexedfv('u
.BI "void glViewportIndexedfv(GLuint\ " "index" ", const\ GLfloat\ *" "v" ");"
.SH "PARAMETERS"
.PP
\fIindex\fR
.RS 4
Specify the first viewport to set\&.
.RE
.PP
\fIx\fR, \fIy\fR
.RS 4
For
\fBglViewportIndexedf\fR, specifies the lower left corner of the viewport rectangle, in pixels\&. The initial value is (0,0)\&.
.RE
.PP
\fIwidth\fR, \fIheight\fR
.RS 4
For
\fBglViewportIndexedf\fR, specifies the width and height of the viewport\&. When a GL context is first attached to a window,
\fIwidth\fR
and
\fIheight\fR
are set to the dimensions of that window\&.
.RE
.PP
\fIv\fR
.RS 4
For
\fBglViewportIndexedfv\fR, specifies the address of an array containing the viewport parameters\&.
.RE
.SH "DESCRIPTION"
.PP
\fBglViewportIndexedf\fR
and
\fBglViewportIndexedfv\fR
specify the parameters for a single viewport\&.
\fIindex\fR
specifies the index of the viewport to modify\&.
\fIindex\fR
must be less than the value of
\fBGL_MAX_VIEWPORTS\fR\&. For
\fBglViewportIndexedf\fR,
\fIx\fR,
\fIy\fR,
\fIw\fR, and
\fIh\fR
specify the left, bottom, width and height of the viewport in pixels, respectively\&. For
\fBglViewportIndexedfv\fR,
\fIv\fR
contains the address of an array of floating point values specifying the left (x), bottom (y), width (w), and height (h) of each viewport, in that order\&.
x
and
y
give the location of the viewport\*(Aqs lower left corner, and
w
and
h
give the width and height of the viewport, respectively\&. The viewport specifies the affine transformation of
x
and
y
from normalized device coordinates to window coordinates\&. Let
x nd y nd
be normalized device coordinates\&. Then the window coordinates
x w y w
are computed as follows:
.PP
x w = x nd + 1 ⁢ width 2 + x
.PP
y w = y nd + 1 ⁢ height 2 + y
.PP
The location of the viewport\*(Aqs bottom left corner, given by (x,
y) is clamped to be within the implementaiton\-dependent viewport bounds range\&. The viewport bounds range [min,
max] can be determined by calling
\fBglGet\fR()
with argument
\fBGL_VIEWPORT_BOUNDS_RANGE\fR\&. Viewport width and height are silently clamped to a range that depends on the implementation\&. To query this range, call
\fBglGet\fR()
with argument
\fBGL_MAX_VIEWPORT_DIMS\fR\&.
.PP
The precision with which the GL interprets the floating point viewport bounds is implementation\-dependent and may be determined by querying the impementation\-defined constant
\fBGL_VIEWPORT_SUBPIXEL_BITS\fR\&.
.PP
Calling
\fBglViewportIndexedfv\fR
is equivalent to calling
\fBglViewportArray\fR()
with
\fIfirst\fR
set to
\fIindex\fR,
\fIcount\fR
set to 1 and
\fIv\fR
passsed directly\&.
\fBglViewportIndexedf\fR
is equivalent to:
.sp
.if n \{\
.RS 4
.\}
.nf
    void glViewportIndexedf(GLuint index, GLfloat x, GLfloat y, GLfloat w, GLfloat h) {
        const float v[4]  = { x, y, w, h };
        glViewportArrayv(index, 1, v);
    }
.fi
.if n \{\
.RE
.\}
.SH "ERRORS"
.PP
\fBGL_INVALID_VALUE\fR
is generated if
\fIindex\fR
is greater than or equal to the value of
\fBGL_MAX_VIEWPORTS\fR\&.
.PP
\fBGL_INVALID_VALUE\fR
is generated if either
\fIwidth\fR
or
\fIheight\fR
is negative\&.
.SH "ASSOCIATED GETS"
.PP
\fBglGet\fR()
with argument
\fBGL_VIEWPORT\fR
.PP
\fBglGet\fR()
with argument
\fBGL_MAX_VIEWPORT_DIMS\fR
.PP
\fBglGet\fR()
with argument
\fBGL_VIEWPORT_BOUNDS_RANGE\fR
.PP
\fBglGet\fR()
with argument
\fBGL_VIEWPORT_SUBPIXEL_BITS\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{
\fBglViewportIndexedf\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{
\fBglViewportIndexedfv\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 1
.SH "SEE ALSO"
.PP
\fBglDepthRange\fR(),
\fBglViewport\fR(),
\fBglViewportArray\fR()
.SH "COPYRIGHT"
.PP
Copyright
\(co
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\&.
\m[blue]\fBhttp://opencontent\&.org/openpub/\fR\m[]\&.
.SH "COPYRIGHT"
.br
Copyright \(co 2010-2014 Khronos Group
.br