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'''OpenGL extension EXT.multi_draw_arrays
This module customises the behaviour of the
OpenGL.raw.GL.EXT.multi_draw_arrays to provide a more
Python-friendly API
Overview (from the spec)
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.
The official definition of this extension is available here:
http://www.opengl.org/registry/specs/EXT/multi_draw_arrays.txt
'''
from OpenGL import platform, constants, constant, arrays
from OpenGL import extensions, wrapper
from OpenGL.GL import glget
import ctypes
from OpenGL.raw.GL.EXT.multi_draw_arrays import *
### END AUTOGENERATED SECTION
from OpenGL.lazywrapper import lazy
from OpenGL.GL.pointers import glDrawElements
@lazy( glMultiDrawElementsEXT )
def glMultiDrawElementsEXT(baseOperation, primtype, counts, typ, indices, primcount=None):
"""Currently glMultiDrawElementsEXT is not working in the wrapper
We are replacing the code with a sequence of glDrawElements calls
as per the spec for the function. Basically we'd spend more effort
making an array of array pointers than we would creating a simple
iteration in Python.
"""
if primcount is not None:
for i in range( primcount ):
glDrawElements( primtype, counts[i], typ, indices[i] )
else:
for c,i in zip( counts, indices ):
glDrawElements( primtype, c, typ, i )
#def convertIndices( arg, wrappedOperation, args ):
# """Convert indices to an array of arrays"""
# return [
# arrays.ArrayDatatype.asArray( element, args[2] )
# for element in arg
# ]
#def resolveIndices( value ):
# pointers = []
# for v in value:
# pointers.append( arrays.ArrayDatatype.voidDataPointer( v ) )
# typ = ctypes.POINTER(None) * len(value)
# return typ( *pointers )
#
#glMultiDrawElementsEXT = wrapper.wrapper( glMultiDrawElementsEXT ).setPyConverter(
# 'indices', convertIndices,
#).setCResolver(
# 'indices', resolveIndices,
#).setPyConverter(
# 'count', arrays.AsArrayTyped( 'count', arrays.GLsizeiArray ),
#).setCResolver(
# 'count', arrays.ArrayDatatype.voidDataPointer ,
#)
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