'\" t
.\"     Title: glDrawTransformFeedback
.\"    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 "GLDRAWTRANSFORMFEEDB" "3G" "05/21/2015" "[FIXME: source]" "[FIXME: manual]"
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.SH "NAME"
glDrawTransformFeedback \- render primitives using a count derived from a transform feedback object
.SH "C SPECIFICATION"
.HP \w'void\ glDrawTransformFeedback('u
.BI "void glDrawTransformFeedback(GLenum\ " "mode" ", GLuint\ " "id" ");"
.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
\fIid\fR
.RS 4
Specifies the name of a transform feedback object from which to retrieve a primitive count\&.
.RE
.SH "DESCRIPTION"
.PP
\fBglDrawTransformFeedback\fR
draws primitives of a type specified by
\fImode\fR
using a count retrieved from the transform feedback specified by
\fIid\fR\&. Calling
\fBglDrawTransformFeedback\fR
is equivalent to calling
\fBglDrawArrays\fR()
with
\fImode\fR
as specified,
\fIfirst\fR
set to zero, and
\fIcount\fR
set to the number of vertices captured on vertex stream zero the last time transform feedback was active on the transform feedback object named by
\fIid\fR\&.
.SH "ERRORS"
.PP
\fBGL_INVALID_ENUM\fR
is generated if
\fImode\fR
is not an accepted value\&.
.PP
\fBGL_INVALID_VALUE\fR
is generated if
\fIid\fR
is not the name of a transform feedback object\&.
.PP
\fBGL_INVALID_OPERATION\fR
is generated if a non\-zero buffer object name is bound to an enabled array 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\&.
.PP
\fBGL_INVALID_OPERATION\fR
is generated if
\fBglEndTransformFeedback\fR()
has never been called while the transform feedback object named by
\fIid\fR
was bound\&.
.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{
\fBglDrawTransformFeedback\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
\fBglDrawArrays\fR(),
\fBglDrawArraysInstanced\fR(),
\fBglDrawElements\fR(),
\fBglDrawRangeElements\fR(),
\fBglDrawTransformFeedbackStream\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