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.\"     Title: glDrawElementsInstancedBaseVertexBaseInstance
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
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.\"      Date: 01/03/2018
.\"    Manual: [FIXME: manual]
.\"    Source: [FIXME: source]
.\"  Language: English
.\"
.TH "GLDRAWELEMENTSINSTAN" "3G" "01/03/2018" "[FIXME: source]" "[FIXME: manual]"
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.SH "NAME"
glDrawElementsInstancedBaseVertexBaseInstance \- render multiple instances of a set of primitives from array data with a per\-element offset
.SH "C SPECIFICATION"
.HP \w'void\ glDrawElementsInstancedBaseVertexBaseInstance('u
.BI "void glDrawElementsInstancedBaseVertexBaseInstance(GLenum\ " "mode" ", GLsizei\ " "count" ", GLenum\ " "type" ", GLvoid\ *" "indices" ", GLsizei\ " "primcount" ", GLint\ " "basevertex" ", GLuint\ " "baseinstance" ");"
.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_TRIANGLE_STRIP\fR,
\fBGL_TRIANGLE_FAN\fR,
\fBGL_TRIANGLES\fR,
\fBGL_LINES_ADJACENCY\fR,
\fBGL_LINE_STRIP_ADJACENCY\fR,
\fBGL_TRIANGLES_ADJACENCY\fR,
\fBGL_TRIANGLE_STRIP_ADJACENCY\fR
and
\fBGL_PATCHES\fR
are accepted\&.
.RE
.PP
\fIcount\fR
.RS 4
Specifies the number of elements to be rendered\&.
.RE
.PP
\fItype\fR
.RS 4
Specifies the type of the values in indices\&. Must be one of
\fBGL_UNSIGNED_BYTE\fR,
\fBGL_UNSIGNED_SHORT\fR, or
\fBGL_UNSIGNED_INT\fR\&.
.RE
.PP
\fIindices\fR
.RS 4
Specifies a pointer to the location where the indices are stored\&.
.RE
.PP
\fIprimcount\fR
.RS 4
Specifies the number of instances of the indexed geometry that should be drawn\&.
.RE
.PP
\fIbasevertex\fR
.RS 4
Specifies a constant that should be added to each element of
\fIindices\fR
when chosing elements from the enabled vertex arrays\&.
.RE
.PP
\fIbaseinstance\fR
.RS 4
Specifies the base instance for use in fetching instanced vertex attributes\&.
.RE
.SH "DESCRIPTION"
.PP
\fBglDrawElementsInstancedBaseVertexBaseInstance\fR
behaves identically to
\fBglDrawElementsInstanced\fR()
except that the
\fIi\fRth element transferred by the corresponding draw call will be taken from element
\fIindices\fR[i] +
\fIbasevertex\fR
of each enabled array\&. If the resulting value is larger than the maximum value representable by
\fItype\fR, it is as if the calculation were upconverted to 32\-bit unsigned integers (with wrapping on overflow conditions)\&. The operation is undefined if the sum would be negative\&. The
\fIbasevertex\fR
has no effect on the shader\-visible value of
\fBgl_VertexID\fR\&.
.PP
Specific vertex attributes may be classified as
\fIinstanced\fR
through the use of
\fBglVertexAttribDivisor\fR()\&. Instanced vertex attributes supply per\-instance vertex data to the vertex shader\&. The index of the vertex fetched from the enabled instanced vertex attribute arrays is calculated as
gl _ InstanceID divisor + baseInstance\&. Note that
\fIbaseinstance\fR
does not affect the shader\-visible value of
\fBgl_InstanceID\fR\&.
.SH "NOTES"
.PP
\fBglDrawElementsInstancedBaseVertex\fR
is only supported if the GL version is 3\&.2 or greater\&.
.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
\fIcount\fR
or
\fIprimcount\fR
is negative\&.
.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 a non\-zero buffer object name is bound to an enabled array or the element array and the buffer object\*(Aqs data store is currently mapped\&.
.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{
\fBglDrawElementsInstancedBaseVertexBaseInstance\fR
T}:T{
\-
T}:T{
\-
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\-
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\-
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\-
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\-
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\-
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\-
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✔
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✔
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✔
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✔
T}
.TE
.sp 1
.SH "SEE ALSO"
.PP
\fBglDrawElements\fR(),
\fBglDrawRangeElements\fR(),
\fBglDrawRangeElementsBaseVertex\fR(),
\fBglDrawElementsInstanced\fR(),
\fBglDrawElementsInstancedBaseVertex\fR()
.SH "COPYRIGHT"
.PP
Copyright
\(co
2011\-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 2011-2014 Khronos Group
.br