GL_EXT_texture_array
http://developer.download.nvidia.com/opengl/specs/GL_EXT_texture_array.txt
	GL_TEXTURE_1D_ARRAY_EXT 0x8C18
	GL_PROXY_TEXTURE_1D_ARRAY_EXT 0x8C19
	GL_TEXTURE_2D_ARRAY_EXT 0x8C1A
	GL_PROXY_TEXTURE_2D_ARRAY_EXT 0x8C1B
	GL_TEXTURE_BINDING_1D_ARRAY_EXT 0x8C1C
	GL_TEXTURE_BINDING_2D_ARRAY_EXT 0x8C1D
	GL_MAX_ARRAY_TEXTURE_LAYERS_EXT 0x88FF
	GL_COMPARE_REF_DEPTH_TO_TEXTURE_EXT 0x884E