113 lines
2.5 KiB
Plaintext
113 lines
2.5 KiB
Plaintext
// Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
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CCEffect %{
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techniques:
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- passes:
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- vert: vs
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frag: fs
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blendState:
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targets:
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- blend: true
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rasterizerState:
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cullMode: none
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properties:
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texture: { value: white }
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alphaThreshold: { value: 0.5 }
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}%
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CCProgram vs %{
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precision highp float;
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#include <cc-global>
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#include <cc-local>
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in vec3 a_position;
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in vec4 a_color;
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out vec4 v_color;
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#if USE_TEXTURE
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in vec2 a_uv0;
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out vec2 v_uv0;
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#endif
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void main () {
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vec4 pos = vec4(a_position, 1);
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#if CC_USE_MODEL
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pos = cc_matViewProj * cc_matWorld * pos;
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#else
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pos = cc_matViewProj * pos;
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#endif
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#if USE_TEXTURE
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v_uv0 = a_uv0;
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#endif
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v_color = a_color;
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gl_Position = pos;
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}
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}%
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CCProgram fs %{
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precision highp float;
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#include <alpha-test>
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#include <texture>
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#include <cc-global>
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in vec4 v_color;
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#if USE_TEXTURE
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in vec2 v_uv0;
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uniform sampler2D texture;
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#endif
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#define LAYERS 20
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#define DEPTH .4
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#define WIDTH .3
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#define SPEED .3
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#define DRIFT .2
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#define DRIFT_PROBABILITY 0.6
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#define iTime cc_time.x
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void main () {
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const mat3 p = mat3(13.323122,23.5112,21.71123,21.1212,28.7312,11.9312,21.8112,14.7212,61.3934);
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vec2 uv = 500./1000. + vec2(1.,1.)*gl_FragCoord.xy / 1000.;
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vec3 acc = vec3(0.0);
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float dof = 5.*sin(iTime*.1);
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for (int i=0;i<LAYERS;i++) {
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float fi = float(i);
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vec2 q = uv*(1.+fi*DEPTH);
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// 根据概率决定雪花是否斜向飘落
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float shouldDrift = step(DRIFT_PROBABILITY, fract(fi * 7.238917));
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float driftAmount = shouldDrift * DRIFT * sin(iTime * 0.5 + fi * 1.5) * (1.0 + 0.5 * sin(fi * 3.7));
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q += vec2(q.y*(WIDTH*mod(fi*7.238917,1.)-WIDTH*.5) + driftAmount, SPEED*iTime/(1.+fi*DEPTH*.03));
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vec3 n = vec3(floor(q),31.189+fi);
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vec3 m = floor(n)*.00001 + fract(n);
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vec3 mp = (31415.9+m)/fract(p*m);
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vec3 r = fract(mp);
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vec2 s = abs(mod(q,1.)-.5+.9*r.xy-.45);
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// 调整雪花大小范围，增加最小雪花尺寸
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s += .008*abs(2.*fract(8.*q.yx)-1.);
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float d = .5*max(s.x-s.y,s.x+s.y)+max(s.x,s.y)-.01;
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float edge = .004+.04*min(.5*abs(fi-5.-dof),1.);
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// 调整雪花大小变化范围，提高最小值
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float sizeVariation = 0.9 + 0.3 * sin(fi * 2.1);
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acc += vec3(smoothstep(edge,-edge,d)*(r.x/(1.+.02*fi*DEPTH)*sizeVariation));
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}
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float a = 0.;
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if(acc.r+acc.g+acc.b>0.3){
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a = acc.r+acc.g+acc.b;
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}
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gl_FragColor = vec4(vec3(acc*5.),a);
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// gl_FragColor = o;
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}
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}% |