const renderEngine = cc.renderer.renderEngine;
const renderer = renderEngine.renderer;
let ShaderMaterial = require('ShaderMaterial');

const shader = {
    name: 'Duquan',
    params: [
        { name: 'u_bili', type: renderer.PARAM_FLOAT },
       
      
    ],

    start(material,params) {
        material.setParamValue('u_bili', 0);
       
     
    },

   

    defines:[],


    frag:
        `
       

        uniform sampler2D texture;
        uniform vec4 color;
        varying vec2 uv0;

        varying vec2 uv1;
        varying vec2 uv2;
        varying vec2 uv3;
     

        uniform float  u_bili;
        

        void main()
        {

            vec4 src_color = vec4(0.376,0.5098,1.0,0.4);
         
            vec2 rpos = vec2(0.5,0.5);
            float dis = distance(uv0,rpos);
            float bili = dis/u_bili;
            src_color.a =  src_color.a*bili*bili;
            float outline = 0.17721518987341772/u_bili *0.001+1.0;
            if(dis<u_bili*outline){
                if(dis<u_bili){
                    src_color.a = 0.0;
                }else{
                    src_color.a = 0.0;
                    //src_color.a = src_color.a*1.5;
                }
            }else{
                src_color.a = min(src_color.a,0.9);
            }
          
         

            gl_FragColor = src_color; 
        }`,
};

ShaderMaterial.addShader(shader);