glMultiDrawArrays — render multiple sets of primitives from array data
void glMultiDrawArrays( | GLenum mode, |
const GLint * first, | |
const GLsizei * count, | |
GLsizei drawcount) ; |
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.
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.
drawcount
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 drawcount
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.
Vertex attributes that are modified by glMultiDrawArrays
have an
unspecified value after glMultiDrawArrays
returns. Attributes that aren't
modified remain well defined.
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.
GL_INVALID_ENUM
is generated if mode
is not an accepted value.
GL_INVALID_VALUE
is generated if drawcount
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.
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