glMultiDrawElements — render multiple sets of primitives by specifying indices of array data elements
void glMultiDrawElements( | GLenum mode, |
const GLsizei * count, | |
GLenum type, | |
const GLvoid ** indices, | |
GLsizei primcount) ; |
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
and
GL_TRIANGLES_ADJACENCY
are accepted.
count
Points to an array of the elements 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.
glMultiDrawElements
specifies multiple sets of geometric primitives with very few subroutine
calls. Instead of calling a GL function to pass each individual vertex,
normal, texture coordinate, edge flag, or color, you can prespecify
separate arrays of vertices, normals, and so on, and use them to construct a
sequence of primitives with a single call to glMultiDrawElements
.
glMultiDrawElements
is identical in operation to glDrawElements except that
primcount
separate lists of elements are specified.
Vertex attributes that are modified by glMultiDrawElements
have an
unspecified value after glMultiDrawElements
returns. Attributes that aren't
modified maintain their previous values.
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 primcount
is negative.
GL_INVALID_OPERATION
is generated if a non-zero buffer object name is bound to an
enabled array or the element array and the buffer object's data store is currently mapped.
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