Graphics.Rendering.OpenGL.Raw.ARB.TextureEnvCombine
gl_ADD_SIGNED_ARB
gl_COMBINE_ALPHA_ARB
gl_COMBINE_ARB
gl_COMBINE_RGB_ARB
gl_CONSTANT_ARB
gl_INTERPOLATE_ARB
gl_OPERAND0_ALPHA_ARB
gl_OPERAND0_RGB_ARB
gl_OPERAND1_ALPHA_ARB
gl_OPERAND1_RGB_ARB
gl_OPERAND2_ALPHA_ARB
gl_OPERAND2_RGB_ARB
gl_PREVIOUS_ARB
gl_PRIMARY_COLOR_ARB
gl_RGB_SCALE_ARB
gl_SOURCE0_ALPHA_ARB
gl_SOURCE0_RGB_ARB
gl_SOURCE1_ALPHA_ARB
gl_SOURCE1_RGB_ARB
gl_SOURCE2_ALPHA_ARB
gl_SOURCE2_RGB_ARB
gl_SUBTRACT_ARB