mirror of
https://github.com/dyuri/repa-shader.git
synced 2025-12-16 11:14:25 +00:00
70 lines
1.5 KiB
HTML
70 lines
1.5 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title><repa-shader> demo</title>
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<script type="module" src="../src/repa-shader.js"></script>
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<style>
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body {
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margin: 0;
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padding: 0;
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background: repeating-linear-gradient(45deg, #333, #333 10px, #666 10px, #666 20px);
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min-height: 100vh;
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display: flex;
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align-items: center;
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justify-content: center;
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flex-direction: column;
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}
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#fsinput {
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width: 90vw;
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height: 50vh;
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}
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</style>
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</head>
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<body>
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<repa-shader fs-input="fsinput" mouse snippets="noise.glsl" width=512 height=512 render-target-count=2>
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<script type="x-shader/x-fragment">
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#define R rotate2D
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vec2 c=FC.xy;
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vec2 uv=FC.xy/r.xy;
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vec2 q;
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vec2 p=(c+c-r)/r.y;
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vec2 n;
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vec4 color;
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float S=6.;
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float a;
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float d=dot(p,p);
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float e=200.;
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p/=.7-d;
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p+=t/PI;
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for(float i = 0.; i < e; i++) {
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color+=(texture(b1,(c/r-.5)*i/e+.5))/e;
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p*=R(5.);
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n*=R(5.);
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a+=dot(sin(q=p*S+i-abs(n)*R(t*.2))/S,r/r);
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n+=cos(q),S*=1.1;
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}
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// a = max(s,.9-a*.2-d);
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a = max(0.,.9-a*.2-d);
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o1=pow(a+a*vec4(8,4,1,0)/e,color+40.);
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float center = smoothstep(.45, .55, uv.x);
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o0=center*color + o1;
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</script>
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</repa-shader>
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<div>
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<textarea id="fsinput"></textarea>
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</div>
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<button id="update">Update</button>
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<script>
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const updateButton = document.getElementById('update');
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updateButton.addEventListener('click', () => {
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const fsinput = document.getElementById('fsinput');
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const shader = document.querySelector('repa-shader');
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shader.render(fsinput.value);
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});
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</script>
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</body>
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</html>
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