const char* ccPositionTexture_GrayScale_frag = STRINGIFY(
\n#ifdef GL_ES\n
\nprecision mediump float;\n
\n#endif\n
\n\n
\nvarying vec4 v_fragmentColor;\n
\nvarying vec2 v_texCoord;\n
\nvoid main(void)\n
\n{\n
\nvec4 c = texture2D(CC_Texture0, v_texCoord);\n
\ngl_FragColor.xyz = vec3(0.2126*c.r + 0.7152*c.g + 0.0722*c.b);\n
\ngl_FragColor.w = c.w;\n
\n}\n
);
