GL_AMD_multi_draw_indirect
http://www.opengl.org/registry/specs/AMD/multi_draw_indirect.txt
GL_AMD_multi_draw_indirect
	void glMultiDrawArraysIndirectAMD (GLenum mode, const void* indirect, GLsizei primcount, GLsizei stride)
	void glMultiDrawElementsIndirectAMD (GLenum mode, GLenum type, const void* indirect, GLsizei primcount, GLsizei stride)
