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

const shader = {
    name: 'Xray',
    params: [
        { name: 'linecolor', type: renderer.PARAM_FLOAT3 },
        { name: 'height', type: renderer.PARAM_FLOAT },
       
    ],

    start(material,params) {
         material.cusparmas = {}
         material.cusparmas._start = 0;
         material.setParamValue('linecolor', cc.v3(params.r,params.g,params.b));
      
    },

   

    defines:[],

    vert:ShaderMaterial.spinevert,

    frag:
        `uniform sampler2D texture;
        varying vec2 uv0;
        uniform vec3 linecolor;
        uniform float height;

        void main()
        {


            if(gl_FragCoord.y>height){
                gl_FragColor = texture2D(texture, uv0);
                return;
            }
           
            vec2 onePixel = vec2(0.001, 0.001);

            vec4 color = texture2D(texture, uv0);
            vec4 colorRight = texture2D(texture, uv0.xy + vec2(0,onePixel.t));
            vec4 colorBottom = texture2D(texture, uv0.xy + vec2(onePixel.s,0));

            color.r = sqrt( (color.r - colorRight.r) * (color.r - colorRight.r) + (color.r - colorBottom.r) * (color.r - colorBottom.r) );
            color.g = sqrt( (color.g - colorRight.g) * (color.g - colorRight.g) + (color.g - colorBottom.g) * (color.g - colorBottom.g) );
            color.b = sqrt( (color.b - colorRight.b) * (color.b - colorRight.b) + (color.b - colorBottom.b) * (color.b - colorBottom.b) );

            if(color.r +color.g + color.b <0.2){
                discard;
            }

             gl_FragColor = vec4(0.0,1.0,0.0, 1.0);


        }`,
};

ShaderMaterial.addShader(shader);