73 lines
2.0 KiB
JavaScript
73 lines
2.0 KiB
JavaScript
const renderEngine = cc.renderer.renderEngine;
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const renderer = renderEngine.renderer;
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let ShaderMaterial = require('ShaderMaterial');
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const shader = {
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name: 'Grass',
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params: [
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{ name: 'u_cPos', type: renderer.PARAM_FLOAT2 },
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// { name: 'u_mPos', type: renderer.PARAM_FLOAT2 },
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// { name: 'u_width', type: renderer.PARAM_FLOAT },
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// { name: 'u_height', type: renderer.PARAM_FLOAT },
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{ name: 'u_dis', type: renderer.PARAM_FLOAT },
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{ name: 'u_plus', type: renderer.PARAM_FLOAT },
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],
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start(material,params) {
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material.setParamValue('u_cPos', cc.v2(0,0));
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material.setParamValue('u_dis', params.distance);
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material.setParamValue('u_plus', params.plus);
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// material.setParamValue('u_mPos', cc.v2(params.pos.x,params.pos.y));//左下
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// material.setParamValue('u_width', params.width);
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// material.setParamValue('u_height', params.height);
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},
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defines:[],
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frag:
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`uniform sampler2D texture;
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uniform vec4 color;
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varying vec2 uv0;
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varying vec2 uv1;
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varying vec2 uv2;
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varying vec2 uv3;
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uniform vec2 u_cPos;
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uniform float u_dis;
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uniform float u_plus;
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void main()
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{
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vec4 src_color = texture2D(texture, uv0).rgba;
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vec2 rpos = vec2(uv2.x + uv3.x*uv1.x , uv2.y + uv3.y*uv1.y );
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float dis = distance(rpos,u_cPos);
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if(dis<u_dis){
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// x大于等于t1=0.9时，结果为0
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// x小于等于t2=0.8时，结果为1
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float mask = smoothstep(0.8, 0.9, dis/u_dis);
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if(mask < u_plus){
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mask = u_plus;
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}
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src_color.a = src_color.a*mask;
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// src_color += vec4(0.2,0.2,0.2,0.0);
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}
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gl_FragColor = src_color;
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}`,
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};
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ShaderMaterial.addShader(shader); |