GL_ARB_texture_rectangle http://www.opengl.org/registry/specs/ARB/texture_rectangle.txt GL_ARB_texture_rectangle GL_TEXTURE_RECTANGLE_ARB 0x84F5 GL_TEXTURE_BINDING_RECTANGLE_ARB 0x84F6 GL_PROXY_TEXTURE_RECTANGLE_ARB 0x84F7 GL_MAX_RECTANGLE_TEXTURE_SIZE_ARB 0x84F8 GL_SAMPLER_2D_RECT_ARB 0x8B63 GL_SAMPLER_2D_RECT_SHADOW_ARB 0x8B64