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

const shader = {
    name: 'uvanimation',
    params: [
        { name: 'time', type: renderer.PARAM_FLOAT },
        // { name: 'dtime', type: renderer.PARAM_FLOAT },
        // { name: 'offset', type: renderer.PARAM_FLOAT },
        // { name: 'linewidth', type: renderer.PARAM_FLOAT },
        // { name: 'linecolor', type: renderer.PARAM_FLOAT3 },
        // { name: 'ymode', type: renderer.PARAM_INT },
    ],

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



    defines:[],

    // vert: `
    //     uniform mat4 viewProj;
    //     attribute vec3 a_position;
    //     attribute vec2 a_uv0;
    //     varying vec2 uv0;
    //     void main () {
    //         vec4 pos = viewProj * vec4(a_position, 1);
    //         gl_Position = pos;
    //         uv0 = a_uv0;
    //     }`,

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

        void main()
        {
            vec2 offset = vec2(0, time);
            gl_FragColor = texture2D(texture, uv0 + offset);
        }`,
};

ShaderMaterial.addShader(shader);