'\" t
.\"     Title: glDrawArraysIndirect
.\"    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 "GLDRAWARRAYSINDIRECT" "3G" "01/03/2018" "[FIXME: source]" "[FIXME: manual]"
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.SH "NAME"
glDrawArraysIndirect \- render primitives from array data, taking parameters from memory
.SH "C SPECIFICATION"
.HP \w'void\ glDrawArraysIndirect('u
.BI "void glDrawArraysIndirect(GLenum\ " "mode" ", const\ void\ *" "indirect" ");"
.SH "PARAMETERS"
.PP
\fImode\fR
.RS 4
Specifies what kind of primitives to render\&. Symbolic constants
\fBGL_POINTS\fR,
\fBGL_LINE_STRIP\fR,
\fBGL_LINE_LOOP\fR,
\fBGL_LINES\fR,
\fBGL_LINE_STRIP_ADJACENCY\fR,
\fBGL_LINES_ADJACENCY\fR,
\fBGL_TRIANGLE_STRIP\fR,
\fBGL_TRIANGLE_FAN\fR,
\fBGL_TRIANGLES\fR,
\fBGL_TRIANGLE_STRIP_ADJACENCY\fR,
\fBGL_TRIANGLES_ADJACENCY\fR, and
\fBGL_PATCHES\fR
are accepted\&.
.RE
.PP
\fIindirect\fR
.RS 4
Specifies the address of a structure containing the draw parameters\&.
.RE
.SH "DESCRIPTION"
.PP
\fBglDrawArraysIndirect\fR
specifies multiple geometric primitives with very few subroutine calls\&.
\fBglDrawArraysIndirect\fR
behaves similarly to
\fBglDrawArraysInstancedBaseInstance\fR(), execept that the parameters to
\fBglDrawArraysInstancedBaseInstance\fR()
are stored in memory at the address given by
\fIindirect\fR\&.
.PP
The parameters addressed by
\fIindirect\fR
are packed into a structure that takes the form (in C):
.sp
.if n \{\
.RS 4
.\}
.nf
    typedef  struct {
        uint  count;
        uint  primCount;
        uint  first;
        uint  baseInstance;
    } DrawArraysIndirectCommand;

    const DrawArraysIndirectCommand *cmd = (const DrawArraysIndirectCommand *)indirect;
    glDrawArraysInstancedBaseInstance(mode, cmd\->first, cmd\->count, cmd\->primCount, cmd\->baseInstance);
.fi
.if n \{\
.RE
.\}
.PP
If a buffer is bound to the
\fBGL_DRAW_INDIRECT_BUFFER\fR
binding at the time of a call to
\fBglDrawArraysIndirect\fR,
\fIindirect\fR
is interpreted as an offset, in basic machine units, into that buffer and the parameter data is read from the buffer rather than from client memory\&.
.PP
In contrast to
\fBglDrawArraysInstancedBaseInstance\fR(), the
first
member of the parameter structure is unsigned, and out\-of\-range indices do not generate an error\&.
.PP
Vertex attributes that are modified by
\fBglDrawArraysIndirect\fR
have an unspecified value after
\fBglDrawArraysIndirect\fR
returns\&. Attributes that aren\*(Aqt modified remain well defined\&.
.SH "NOTES"
.PP
The
\fIbaseInstance\fR
member of the
\fIDrawArraysIndirectCommand\fR
structure is defined only if the GL version is 4\&.2 or greater\&. For versions of the GL less than 4\&.2, this parameter is present but is reserved and should be set to zero\&. On earlier versions of the GL, behavior is undefined if it is non\-zero\&.
.SH "ERRORS"
.PP
\fBGL_INVALID_ENUM\fR
is generated if
\fImode\fR
is not an accepted value\&.
.PP
\fBGL_INVALID_OPERATION\fR
is generated if a non\-zero buffer object name is bound to an enabled array or to the
\fBGL_DRAW_INDIRECT_BUFFER\fR
binding and the buffer object\*(Aqs data store is currently mapped\&.
.PP
\fBGL_INVALID_OPERATION\fR
is generated if a geometry shader is active and
\fImode\fR
is incompatible with the input primitive type of the geometry shader in the currently installed program object\&.
.PP
\fBGL_INVALID_OPERATION\fR
is generated if
\fImode\fR
is
\fBGL_PATCHES\fR
and no tessellation control shader is active\&.
.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{
\fBglDrawArraysIndirect\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
\fBglDrawArrays\fR(),
\fBglDrawArraysInstanced\fR(),
\fBglDrawElements\fR(),
\fBglDrawRangeElements\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