glMultiDrawArrays — render multiple sets of primitives from array data
void glMultiDrawArrays( | GLenum | mode, |
GLint * | first, | |
GLsizei * | count, | |
GLsizei | primcount) ; |
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 the first and count
glMultiDrawArrays
specifies multiple sets of geometric primitives
with very few subroutine calls. Instead of calling a GL procedure
to pass each individual vertex, normal, texture coordinate, edge
flag, or color, you can prespecify
separate arrays of vertices, normals, and colors and use them to
construct a sequence of primitives with a single
call to glMultiDrawArrays
.
glMultiDrawArrays
behaves identically to glDrawArrays except that primcount
separate ranges of elements are specified instead.
When glMultiDrawArrays
is called, it uses count
sequential elements from each
enabled array to construct a sequence of geometric primitives,
beginning with element first
. mode
specifies what kind of
primitives are constructed, and how the array elements
construct those primitives. If GL_VERTEX_ARRAY
is not enabled, no
geometric primitives are generated.
Vertex attributes that are modified by glMultiDrawArrays
have an
unspecified value after glMultiDrawArrays
returns. For example, if
GL_COLOR_ARRAY
is enabled, the value of the current color is
undefined after glMultiDrawArrays
executes. Attributes that aren't
modified remain well defined.
glMultiDrawArrays
is available only if the GL version is 1.4 or greater.
glMultiDrawArrays
is included in display lists. If glMultiDrawArrays
is entered into a
display list,
the necessary array data (determined by the array pointers and
enables) is also
entered into the display list. Because the array pointers and
enables are client-side state, their values affect display lists
when the lists are created, not when the lists are executed.
GL_INVALID_ENUM
is generated if mode
is not an accepted value.
GL_INVALID_VALUE
is generated if primcount
is negative.
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.
GL_INVALID_OPERATION
is generated if glMultiDrawArrays
is executed between
the execution of glBegin and the corresponding glEnd.
glArrayElement, glColorPointer, glDrawElements, glDrawRangeElements, glEdgeFlagPointer, glFogCoordPointer, glGetPointerv, glIndexPointer, glInterleavedArrays, glNormalPointer, glSecondaryColorPointer, glTexCoordPointer, glVertexPointer
Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.