},
      { pname: gl.TEXTURE_MAG_FILTER,  param: gl.LINEAR },
      { pname: gl.TEXTURE_COMPARE_MODE,  param: gl.NONE },
      { pname: gl.TEXTURE_COMPARE_MODE,  param: gl.COMPARE_REF_TO_TEXTURE },
      { pname: gl.TEXTURE_COMPARE_FUNC,  param: gl.LEQUAL },
      { pname: gl.TEXTURE_COMPARE_FUNC,  param: gl.GEQUAL },
      { pname: gl.TEXTURE_COMPARE_FUNC,  param: gl.LESS },
      { pname: gl.TEXTURE_COMPARE_FUNC,  param: gl.GREATER },
      { pname: gl.TEXTURE_COMPARE_FUNC,  param: gl.EQUAL },
      { pna