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'''OpenGL extension EXT.instanced_arrays
This module customises the behaviour of the
OpenGL.raw.GLES2.EXT.instanced_arrays to provide a more
Python-friendly API
Overview (from the spec)
A common use case in GL for some applications is to be able to
draw the same object, or groups of similar objects that share
vertex data, primitive count and type, multiple times. This
extension provides a means of accelerating such use cases while
reducing the number of API calls, and keeping the amount of
duplicate data to a minimum.
This extension introduces an array "divisor" for generic
vertex array attributes, which when non-zero specifies that the
attribute is "instanced." An instanced attribute does not
advance per-vertex as usual, but rather after every <divisor>
conceptual draw calls.
(Attributes which aren't instanced are repeated in their entirety
for every conceptual draw call.)
By specifying transform data in an instanced attribute or series
of instanced attributes, vertex shaders can, in concert with the
instancing draw calls, draw multiple instances of an object with
one draw call.
The official definition of this extension is available here:
http://www.opengl.org/registry/specs/EXT/instanced_arrays.txt
'''
from OpenGL import platform, constant, arrays
from OpenGL import extensions, wrapper
import ctypes
from OpenGL.raw.GLES2 import _types, _glgets
from OpenGL.raw.GLES2.EXT.instanced_arrays import *
from OpenGL.raw.GLES2.EXT.instanced_arrays import _EXTENSION_NAME
def glInitInstancedArraysEXT():
'''Return boolean indicating whether this extension is available'''
from OpenGL import extensions
return extensions.hasGLExtension( _EXTENSION_NAME )
# INPUT glDrawElementsInstancedEXT.indices size not checked against 'count,type'
glDrawElementsInstancedEXT=wrapper.wrapper(glDrawElementsInstancedEXT).setInputArraySize(
'indices', None
)
### END AUTOGENERATED SECTION
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