module.exports = 
`
#ifdef GL_ES
precision lowp float;
#endif

varying vec4 v_fragmentColor;
varying vec2 v_texCoord;
void main()
{
    vec4 c = v_fragmentColor * texture2D(CC_Texture0, v_texCoord);
    gl_FragColor.xyz = vec3(0.2126 * c.r + 0.7152 * c.g + 0.0722 * c.b);
    gl_FragColor.w = c.w;
}
`
/**
 *  vec4 c = v_fragmentColor * texture2D(CC_Texture0, v_texCoord);
    gl_FragColor = vec4(0.188, 0.478, 0.898, 1);
    gl_FragColor.w = c.w;
 */