GL_EXT_pixel_transform
http://oss.sgi.com/projects/ogl-sample/registry/EXT/pixel_transform.txt
	GL_PIXEL_TRANSFORM_2D_EXT 0x8330
	GL_PIXEL_MAG_FILTER_EXT 0x8331
	GL_PIXEL_MIN_FILTER_EXT 0x8332
	GL_PIXEL_CUBIC_WEIGHT_EXT 0x8333
	GL_CUBIC_EXT 0x8334
	GL_AVERAGE_EXT 0x8335
	GL_PIXEL_TRANSFORM_2D_STACK_DEPTH_EXT 0x8336
	GL_MAX_PIXEL_TRANSFORM_2D_STACK_DEPTH_EXT 0x8337
	GL_PIXEL_TRANSFORM_2D_MATRIX_EXT 0x8338
	void glGetPixelTransformParameterfvEXT (GLenum target, GLenum pname, const GLfloat* params)
	void glGetPixelTransformParameterivEXT (GLenum target, GLenum pname, const GLint* params)
	void glPixelTransformParameterfEXT (GLenum target, GLenum pname, const GLfloat param)
	void glPixelTransformParameterfvEXT (GLenum target, GLenum pname, const GLfloat* params)
	void glPixelTransformParameteriEXT (GLenum target, GLenum pname, const GLint param)
	void glPixelTransformParameterivEXT (GLenum target, GLenum pname, const GLint* params)