glDrawElementsInstanced man page on Oracle
[printable version]
GLDRAWELEMENTSINSTAN(3G) OpenGL Manual GLDRAWELEMENTSINSTAN(3G)
NAME
glDrawElementsInstanced - draw multiple instances of a set of elements
C SPECIFICATION
void glDrawElementsInstanced(GLenum mode, GLsizei count, GLenum type,
const void * indices, GLsizei primcount);
PARAMETERS
mode
Specifies what kind of primitives to render. Symbolic constants
GL_POINTS, GL_LINE_STRIP, GL_LINE_LOOP, GL_LINES,
GL_LINE_STRIP_ADJACENCY, GL_LINES_ADJACENCY, GL_TRIANGLE_STRIP,
GL_TRIANGLE_FAN, GL_TRIANGLES, GL_TRIANGLE_STRIP_ADJACENCY,
GL_TRIANGLES_ADJACENCY and GL_PATCHES are accepted.
count
Specifies the number of elements to be rendered.
type
Specifies the type of the values in indices. Must be one of
GL_UNSIGNED_BYTE, GL_UNSIGNED_SHORT, or GL_UNSIGNED_INT.
indices
Specifies a pointer to the location where the indices are stored.
primcount
Specifies the number of instances of the specified range of indices
to be rendered.
DESCRIPTION
glDrawElementsInstanced behaves identically to glDrawElements() except
that primcount instances of the set of elements are executed and the
value of the internal counter instanceID advances for each iteration.
instanceID is an internal 32-bit integer counter that may be read by a
vertex shader as gl_InstanceID.
glDrawElementsInstanced has the same effect as:
if (mode, count, or type is invalid )
generate appropriate error
else {
for (int i = 0; i < primcount ; i++) {
instanceID = i;
glDrawElements(mode, count, type, indices);
}
instanceID = 0;
}
NOTES
glDrawElementsInstanced is available only if the GL version is 3.1 or
greater.
GL_LINE_STRIP_ADJACENCY, GL_LINES_ADJACENCY,
GL_TRIANGLE_STRIP_ADJACENCY and GL_TRIANGLES_ADJACENCY are available
only if the GL version is 3.2 or greater.
ERRORS
GL_INVALID_ENUM is generated if mode is not one of GL_POINTS,
GL_LINE_STRIP, GL_LINE_LOOP, GL_LINES, GL_TRIANGLE_STRIP,
GL_TRIANGLE_FAN, or GL_TRIANGLES.
GL_INVALID_VALUE is generated if count or primcount are negative.
GL_INVALID_OPERATION is generated if a geometry shader is active and
mode is incompatible with the input primitive type of the geometry
shader in the currently installed program object.
GL_INVALID_OPERATION is generated if a non-zero buffer object name is
bound to an enabled array and the buffer object's data store is
currently mapped.
SEE ALSO
glDrawElements(), glDrawArraysInstanced()
COPYRIGHT
Copyright © 2010 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. http://opencontent.org/openpub/.
AUTHORS
opengl.org
opengl.org 04/29/2014 GLDRAWELEMENTSINSTAN(3G)
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