90 lines
2.0 KiB
JavaScript
90 lines
2.0 KiB
JavaScript
module.exports =
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`
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#ifdef GL_ES
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precision mediump float;
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#endif
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varying vec2 v_texCoord;
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uniform float u_dH;
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uniform float u_dS;
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uniform float u_dL;
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void main() {
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vec4 texColor=texture2D(CC_Texture0, v_texCoord).rgba;
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float r=texColor.r;
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float g=texColor.g;
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float b=texColor.b;
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float a=texColor.a;
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float h;
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float s;
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float l;
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{
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float max=max(max(r,g),b);
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float min=min(min(r,g),b);
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if(max==min){
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h=0.0;
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}else if(max==r&&g>=b){
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h=60.0*(g-b)/(max-min)+0.0;
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}else if(max==r&&g<b){
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h=60.0*(g-b)/(max-min)+360.0;
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}else if(max==g){
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h=60.0*(b-r)/(max-min)+120.0;
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}else if(max==b){
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h=60.0*(r-g)/(max-min)+240.0;
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}
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l=0.5*(max+min);
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if(l==0.0||max==min){
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s=0.0;
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}else if(0.0<=l&&l<=0.5){
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s=(max-min)/(2.0*l);
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}else if(l>0.5){
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s=(max-min)/(2.0-2.0*l);
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}
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}
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h=h+u_dH;
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s=min(1.0,max(0.0,s+u_dS));
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vec4 finalColor;
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{
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float q;
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if(l<0.5){
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q=l*(1.0+s);
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}else if(l>=0.5){
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q=l+s-l*s;
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}
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float p=2.0*l-q;
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float hk=h/360.0;
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float t[3];
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t[0]=hk+1.0/3.0;t[1]=hk;t[2]=hk-1.0/3.0;
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for(int i=0;i<3;i++){
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if(t[i]<0.0)t[i]+=1.0;
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if(t[i]>1.0)t[i]-=1.0;
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}
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float c[3];
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for(int i=0;i<3;i++){
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if(t[i]<1.0/6.0){
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c[i]=p+((q-p)*6.0*t[i]);
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}else if(1.0/6.0<=t[i]&&t[i]<0.5){
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c[i]=q;
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}else if(0.5<=t[i]&&t[i]<2.0/3.0){
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c[i]=p+((q-p)*6.0*(2.0/3.0-t[i]));
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}else{
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c[i]=p;
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}
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}
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finalColor=vec4(c[0],c[1],c[2],a);
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}
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finalColor+=vec4(u_dL,u_dL,u_dL,0.0);
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gl_FragColor=finalColor;
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}
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`; |