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

const shader = {
    name: 'niuqu',
     params: [

        { name: 'u_displacement', type: renderer.PARAM_TEXTURE_2D },
        { name: 'u_magnitude', type: renderer.PARAM_FLOAT },//0-0.1
        { name: 'u_strength', type: renderer.PARAM_FLOAT2 },//0-1
        { name: 'time', type: renderer.PARAM_FLOAT },//0-1
       
    ],

    start(material, params) {
        material.cusparmas = {}
        material.cusparmas._start = 0;
        material.setParamValue('u_magnitude', params.u_magnitude);
        material.setParamValue('u_strength', params.u_strength);
        material.setParamValue('u_displacement', params.u_displacement._texture);
        material.setParamValue('time', 0);

    },
    update(material, dt) {
        material.cusparmas._start+=dt
        material.setParamValue('time',  material.cusparmas._start);
    },



    defines: [],


    frag: `
        uniform sampler2D texture;
        uniform vec4 color;
        varying vec2 uv0;

        varying vec2 uv1;
        varying vec2 uv2;
        varying vec2 uv3;
        uniform float time;
        uniform sampler2D u_displacement;
        uniform float u_magnitude;
        uniform vec2 u_strength;

        void main() {
      
            vec2 disp = texture2D(u_displacement, uv0 + u_strength * time).xy;
           
            disp = ((disp * 2.0) - 1.0) * u_magnitude;
               
            gl_FragColor = texture2D(texture, uv0 + disp)*vec4(0.9,0.9,1.0,0.5);

        }`,
};

ShaderMaterial.addShader(shader);