50 lines
1.2 KiB
JavaScript
50 lines
1.2 KiB
JavaScript
/**
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* A disco like star light.
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*/
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class StarLightColorationShader extends AdaptiveColorationShader {
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/** @override */
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static forceDefaultColor = true;
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/** @override */
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static fragmentShader = `
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${this.SHADER_HEADER}
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${this.PERCEIVED_BRIGHTNESS}
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${this.PRNG}
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${this.NOISE}
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${this.FBM(2, 1.0)}
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vec2 transform(in vec2 uv, in float dist) {
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float t = time * 0.20;
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float cost = cos(t);
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float sint = sin(t);
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mat2 rotmat = mat2(cost, -sint, sint, cost);
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uv *= rotmat;
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return uv;
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}
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float makerays(in vec2 uv, in float t) {
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vec2 uvn = normalize(uv * (uv + t)) * (5.0 + intensity);
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return max(clamp(0.5 * tan(fbm(uvn - t)), 0.0, 2.25),
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clamp(3.0 - tan(fbm(uvn + t * 2.0)), 0.0, 2.25));
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}
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float starlight(in float dist) {
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vec2 uv = (vUvs - 0.5);
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uv = transform(uv, dist);
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float rays = makerays(uv, time * 0.5);
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return pow(1.0 - dist, rays) * pow(1.0 - dist, 0.25);
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}
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void main() {
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${this.FRAGMENT_BEGIN}
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finalColor = clamp(color * starlight(dist) * colorationAlpha, 0.0, 1.0);
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${this.COLORATION_TECHNIQUES}
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${this.ADJUSTMENTS}
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${this.FALLOFF}
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${this.FRAGMENT_END}
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}
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`;
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}
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