GL_EXT_vertex_weighting
http://oss.sgi.com/projects/ogl-sample/registry/EXT/vertex_weighting.txt
	GL_MODELVIEW0_STACK_DEPTH_EXT 0x0BA3
	GL_MODELVIEW0_MATRIX_EXT 0x0BA6
	GL_MODELVIEW0_EXT 0x1700
	GL_MODELVIEW1_STACK_DEPTH_EXT 0x8502
	GL_MODELVIEW1_MATRIX_EXT 0x8506
	GL_VERTEX_WEIGHTING_EXT 0x8509
	GL_MODELVIEW1_EXT 0x850A
	GL_CURRENT_VERTEX_WEIGHT_EXT 0x850B
	GL_VERTEX_WEIGHT_ARRAY_EXT 0x850C
	GL_VERTEX_WEIGHT_ARRAY_SIZE_EXT 0x850D
	GL_VERTEX_WEIGHT_ARRAY_TYPE_EXT 0x850E
	GL_VERTEX_WEIGHT_ARRAY_STRIDE_EXT 0x850F
	GL_VERTEX_WEIGHT_ARRAY_POINTER_EXT 0x8510
	void glVertexWeightPointerEXT (GLint size, GLenum type, GLsizei stride, void* pointer)
	void glVertexWeightfEXT (GLfloat weight)
	void glVertexWeightfvEXT (GLfloat* weight)