133 lines
3.1 KiB
GLSL
133 lines
3.1 KiB
GLSL
#define time iTime
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#define PI 3.14159265359
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#define NUM_BANDS 32
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//#define REVERSED
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float noise3D(vec3 p)
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{
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return fract(sin(dot(p ,vec3(12.9898,78.233,12.7378))) * 43758.5453)*2.0-1.0;
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}
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vec3 mixc(vec3 col1, vec3 col2, float v)
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{
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v = clamp(v,0.0,1.0);
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return col1+v*(col2-col1);
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}
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vec3 drawBands(vec2 uv)
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{
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uv = 2.0*uv-1.0;
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uv.x*=iResolution.x/iResolution.y;
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uv = vec2(length(uv), atan(uv.y,uv.x));
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//uv.x-=0.25;
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//uv.x = max(0.0,uv.x);
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uv.y -= PI*0.5;
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vec2 uv2 = vec2(uv.x, uv.y*-1.0);
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uv.y = mod(uv.y,PI*2.0);
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uv2.y = mod(uv2.y,PI*2.0);
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vec3 col = vec3(0.0);
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vec3 col2 = vec3(0.0);
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float nBands = float(NUM_BANDS);
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float i = floor(uv.x*nBands);
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float f = fract(uv.x*nBands);
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float band = i/nBands;
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float s;
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#ifdef REVERSED
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band = 1.0-band;
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#endif
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//cubic easing
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band *= band*band;
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band = band*0.99;
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band += 0.01;
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s = texture( iChannel0, vec2(band,0.25) ).x;
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if(band<0.0||band>=1.0){
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s = 0.0;
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}
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/* Gradient colors and amount here */
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const int nColors = 4;
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vec3 colors[nColors];
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colors[0] = vec3(0.05,0.05,1.0);
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colors[1] = vec3(0.05,1.00,1.00);
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colors[2] = vec3(0.50,1.00,0.25);
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colors[3] = vec3(1.00,0.75,0.25);
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vec3 gradCol = colors[0];
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float n = float(nColors)-1.0;
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for(int i = 1; i < nColors; i++)
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{
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gradCol = mixc(gradCol,colors[i],(s-float(i-1)/n)*n);
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}
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float h = PI*0.5;
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col += vec3(1.0-smoothstep(-0.5,0.0,uv.y-s*h));
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col *= gradCol;
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col2 += vec3(1.0-smoothstep(-0.5,0.0,uv2.y-s*h));
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col2*= gradCol;
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col = mix(col,col2,step(0.0,uv.y-PI));
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col *= smoothstep(0.125,0.375,f);
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col *= smoothstep(0.875,0.625,f);
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col = clamp(col,0.0,1.0);
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return col;
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}
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void mainImage( out vec4 fragColor, in vec2 fragCoord )
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{
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vec2 uv = fragCoord.xy / iResolution.xy;
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vec2 p = vec2(uv.x, uv.y+0.2);
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vec3 col = vec3(0.0);
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col += drawBands(p);//*smoothstep(1.0,0.5,uv.y);;
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vec3 ref = vec3(0.0);
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vec2 eps = vec2(0.0025,-0.0025);
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ref += drawBands(vec2(p.x,1.0-p.y)+eps.xx);
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ref += drawBands(vec2(p.x,1.0-p.y)+eps.xy);
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ref += drawBands(vec2(p.x,1.0-p.y)+eps.yy);
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ref += drawBands(vec2(p.x,1.0-p.y)+eps.yx);
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ref += drawBands(vec2(p.x+eps.x,1.0-p.y));
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ref += drawBands(vec2(p.x+eps.y,1.0-p.y));
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ref += drawBands(vec2(p.x,1.0-p.y+eps.x));
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ref += drawBands(vec2(p.x,1.0-p.y+eps.y));
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ref /= 8.0;
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float colStep = length(smoothstep(0.0,0.1,col));
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vec3 cs1 = drawBands(vec2(0.5,0.51));
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vec3 cs2 = drawBands(vec2(0.5,0.93));
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vec3 plCol = mix(cs1,cs2,length(p*2.0-1.0))*0.15*smoothstep(0.75,-0.25,length(p*2.0-1.0));
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vec3 plColBg = vec3(0.05)*smoothstep(1.0,0.0,length(p*2.0-1.0));
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vec3 pl = (plCol+plColBg)*smoothstep(0.5,0.65,1.0-uv.y);
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col += clamp(pl*(1.0-colStep),0.0,1.0);
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col += ref*smoothstep(0.125,1.6125,p.y);
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col = clamp(col, 0.0, 1.0);
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float dither = noise3D(vec3(uv,time))*2.0/256.0;
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col += dither;
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fragColor = vec4(col,1.0);
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} |