'\" t
.\"     Title: glViewportArray
.\"    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 "GLVIEWPORTARRAY" "3G" "01/03/2018" "[FIXME: source]" "[FIXME: manual]"
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.SH "NAME"
glViewportArray \- set multiple viewports
.SH "C SPECIFICATION"
.HP \w'void\ glViewportArrayv('u
.BI "void glViewportArrayv(GLuint\ " "first" ", GLsizei\ " "count" ", const\ GLfloat\ *" "v" ");"
.SH "PARAMETERS"
.PP
\fIfirst\fR
.RS 4
Specify the first viewport to set\&.
.RE
.PP
\fIcount\fR
.RS 4
Specify the number of viewports to set\&.
.RE
.PP
\fIv\fR
.RS 4
Specify the address of an array containing the viewport parameters\&.
.RE
.SH "DESCRIPTION"
.PP
\fBglViewportArrayv\fR
specifies the parameters for multiple viewports simulataneously\&.
\fIfirst\fR
specifies the index of the first viewport to modify and
\fIcount\fR
specifies the number of viewports to modify\&.
\fIfirst\fR
must be less than the value of
\fBGL_MAX_VIEWPORTS\fR, and
\fIfirst\fR
+
\fIcount\fR
must be less than or equal to the value of
\fBGL_MAX_VIEWPORTS\fR\&. Viewports whose indices lie outside the range [\fIfirst\fR,
\fIfirst\fR
+
\fIcount\fR) are not modified\&.
\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\&.
.SH "ERRORS"
.PP
\fBGL_INVALID_VALUE\fR
is generated if
\fIfirst\fR
is greater than or equal to the value of
\fBGL_MAX_VIEWPORTS\fR\&.
.PP
\fBGL_INVALID_VALUE\fR
is generated if
\fIfirst\fR
+
\fIcount\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.
T{
\fBglViewportArrayv\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(),
\fBglViewportIndexed\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