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GLDRAWELEMENTSINSTAN(3G) OpenGL Manual GLDRAWELEMENTSINSTAN(3G)
NAME
glDrawElementsInstancedBaseInstance - draw multiple instances of a set
of elements with offset applied to instanced attributes
C SPECIFICATION
void glDrawElementsInstancedBaseInstance(GLenum mode, GLsizei count,
GLenum type,
const void * indices,
GLsizei primcount,
GLuitn baseinstance);
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.
baseinstance
Specifies the base instance for use in fetching instanced vertex
attributes.
DESCRIPTION
glDrawElementsInstancedBaseInstance 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.
glDrawElementsInstancedBaseInstance 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;
}
Specific vertex attributes may be classified as instanced through the
use of glVertexAttribDivisor(). 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
baseinstance does not affect the shader-visible value of gl_InstanceID.
NOTES
glDrawElementsInstancedBaseInstance is available only if the GL version
is 4.2 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 © 2011 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 03/16/2013 GLDRAWELEMENTSINSTAN(3G)
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