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Name
EXT_multi_draw_arrays
SUN_multi_draw_arrays
Name Strings
GL_EXT_multi_draw_arrays
GL_SUN_multi_draw_arrays
(Note: this extension has been promoted from SUN to EXT status.
Implementations should advertise both name strings, and both EXT
and SUN versions of the new GL functions should be provided).
Contact
Ron Bielaski, Sun (Ron.Bielaski 'at' eng.sun.com)
Jack Middleton, Sun (Jack.Middleton 'at' eng.sun.com)
Status
Shipping
Version
Version 4, June 18, 2013
Number
148
OpenGL ES Extension #69
Dependencies
OpenGL 1.1 is required. The language is written against the OpenGL 1.2
specification.
Overview
These functions behave identically to the standard OpenGL 1.1 functions
glDrawArrays() and glDrawElements() except they handle multiple lists of
vertices in one call. Their main purpose is to allow one function call
to render more than one primitive such as triangle strip, triangle fan,
etc.
New Procedures and Functions
void glMultiDrawArraysEXT( GLenum mode,
const GLint *first,
const GLsizei *count,
GLsizei primcount)
Parameters
----------
mode Specifies what kind of primitives to
render. Symbolic constants GL_POINTS,
GL_LINE_STRIP, GL_LINE_LOOP, GL_LINES,
GL_TRIANGLE_STRIP, GL_TRIANGLE_FAN,
GL_TRIANGLES, GL_QUAD_STRIP, GL_QUADS,
and GL_POLYGON are accepted.
first Points to an array of starting indices in
the enabled arrays.
count Points to an array of the number of indices
to be rendered.
primcount Specifies the size of first and count
void glMultiDrawElementsEXT( GLenum mode,
GLsizei *count,
GLenum type,
const void * const *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_TRIANGLE_STRIP,
GL_TRIANGLE_FAN, GL_TRIANGLES, GL_QUAD_STRIP,
GL_QUADS, and GL_POLYGON are accepted.
count Points to and array of the element counts
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 size of the count array
New Tokens
None
Additions to Chapter 2 of the 1.2 Specification (OpenGL Operation)
Section 2.8 Vertex Arrays:
The command
void glMultiDrawArraysEXT( GLenum mode,
const GLint* first,
const GLsizei *count,
GLsizei primcount)
Behaves identically to DrawArrays except that a list of arrays is
specified instead. The number of lists is specified in the primcount
parameter. It has the same effect as:
for(i=0; i<primcount; i++) {
if (*(count+i)>0) DrawArrays(mode, *(first+i), *(count+i));
}
The command
void glMultiDrawElementsEXT( GLenum mode,
GLsizei *count,
GLenum type,
const void **indices,
GLsizei primcount)
Behaves identically to DrawElements except that a list of arrays is
specified instead. The number of lists is specified in the primcount
parameter. It has the same effect as:
for(i=0; i<primcount; i++) {
if (*(count+i)>0) DrawElements(mode, *(count+i), type,
*(indices+i));
}
Additions to Chapter 3 of the 1.2 Specification (Rasterization)
None
Additions to Chapter 4 of the 1.2 Specification (Per-Fragment Operations and
None
Additions to Chapter 5 of the 1.2 Specification (Special Functions)
None
Additions to Chapter 6 of the 1.2 Specification (State and State Requests)
None
Additions to the GLX / WGL / AGL Specifications
None
GLX Protocol
None
Errors
GL_INVALID_ENUM is generated if <mode> is not an accepted value.
GL_VALUE is generated if <primcount> is negative.
GL_INVALID_OPERATION is generated if glMultiDrawArraysEXT or
glMultiDrawElementsEXT is executed between the execution of glBegin
and the corresponding glEnd.
New State
None
OpenGL ES interactions
This extension can also be implemented against OpenGL ES 1.x or
OpenGL ES 2.0. In those cases, remove references to glBegin, glEnd,
and to GL_QUAD_STRIP, GL_QUADS, and GL_POLYGON.
Revision History
Version 5, 2013/09/08 (Jon Leech) - Changed GLvoid -> void
(Bug 10412).
Version 4, 2013/06/18 (Jon Leech) - Added 'const' to
MultiDrawElementsEXT, too, based on feedback from Mesa.
Version 3, 2010/08/06 - Added 'const' to MultiDrawArraysEXT pointer
arguments to match the core GL entry point.
30/09/09 - Added fields from the new extension template and
interactions with OpenGL ES.
6/24/99 - Added fields from the new extension template.