1GL_EXT_texture_perturb_normal
2https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_texture_perturb_normal.txt
3GL_EXT_texture_perturb_normal
4
5	GL_PERTURB_EXT 0x85AE
6	GL_TEXTURE_NORMAL_EXT 0x85AF
7	void glTextureNormalEXT (GLenum mode)
8