GL_ARB_texture_storage
http://www.opengl.org/registry/specs/ARB/texture_storage.txt
GL_ARB_texture_storage
	GL_TEXTURE_IMMUTABLE_FORMAT 0x912F
	void glTexStorage1D (GLenum target, GLsizei levels, GLenum internalformat, GLsizei width)
	void glTexStorage2D (GLenum target, GLsizei levels, GLenum internalformat, GLsizei width, GLsizei height)
	void glTexStorage3D (GLenum target, GLsizei levels, GLenum internalformat, GLsizei width, GLsizei height, GLsizei depth)
	void glTextureStorage1DEXT (GLuint texture, GLenum target, GLsizei levels, GLenum internalformat, GLsizei width)
	void glTextureStorage2DEXT (GLuint texture, GLenum target, GLsizei levels, GLenum internalformat, GLsizei width, GLsizei height)
	void glTextureStorage3DEXT (GLuint texture, GLenum target, GLsizei levels, GLenum internalformat, GLsizei width, GLsizei height, GLsizei depth)
