mirror of
https://github.com/bilawalsidhu/gods-eye-view.git
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94 lines
3.0 KiB
JavaScript
94 lines
3.0 KiB
JavaScript
/**
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* Snow Style — White overlay + Desaturation + Falling particles
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* Transforms the world into a winter wonderland
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*/
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export const snowShader = {
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name: 'snow',
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uniforms: {
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density: { default: 0.6, min: 0, max: 1, label: 'Density' },
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wind: { default: 0.5, min: 0, max: 1, label: 'Wind' },
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},
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fragmentShader: /* glsl */ `
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uniform sampler2D colorTexture;
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uniform vec2 colorTextureDimensions;
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uniform float intensity;
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uniform float time;
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uniform float density;
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uniform float wind;
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in vec2 v_textureCoordinates;
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// Hash function for pseudo-random snow
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float hash(vec2 p) {
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p = fract(p * vec2(123.34, 456.21));
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p += dot(p, p + 45.32);
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return fract(p.x * p.y);
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}
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// Layered snow particles
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float snowLayer(vec2 uv, float layer) {
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float depth = 0.5 + layer * 0.5;
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float speed = 0.4 + layer * 0.3;
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float size = mix(0.01, 0.025, layer);
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float windForce = sin(time * 0.5 + layer * 3.14) * (0.05 + wind * 0.2);
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vec2 snowUV = uv * vec2(1.0, 0.5) * (4.0 + layer * 4.0);
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snowUV.y += time * speed;
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snowUV.x += time * windForce;
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vec2 cell = floor(snowUV);
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vec2 f = fract(snowUV);
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float snow = 0.0;
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// Check neighboring cells for smooth particles
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for (int y = -1; y <= 1; y++) {
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for (int x = -1; x <= 1; x++) {
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vec2 neighbor = vec2(float(x), float(y));
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vec2 point = vec2(hash(cell + neighbor), hash(cell + neighbor + 100.0));
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// Animate particle position slightly
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point = 0.5 + 0.4 * sin(time * 0.3 + 6.2831 * point);
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float d = length(f - neighbor - point);
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snow += smoothstep(size, 0.0, d) * depth;
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}
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}
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return snow;
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}
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void main() {
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vec2 uv = v_textureCoordinates;
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vec4 color = texture(colorTexture, uv);
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// Cool/blue color shift
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vec3 cool = color.rgb * vec3(0.85, 0.9, 1.1);
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// Desaturate partially
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float luma = dot(cool, vec3(0.299, 0.587, 0.114));
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vec3 desaturated = mix(cool, vec3(luma), 0.4 * intensity);
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// Brighten (snow coverage lightens everything)
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vec3 brightened = mix(desaturated, vec3(1.0), 0.15 * intensity);
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// Add white frost overlay on brighter areas
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float frostMask = smoothstep(0.3, 0.8, luma);
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vec3 frosted = mix(brightened, vec3(0.95, 0.97, 1.0), frostMask * 0.25 * intensity);
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// Accumulate snow particle layers (density controls amount)
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float snow = 0.0;
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snow += snowLayer(uv, 0.0) * 0.5;
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snow += snowLayer(uv, 0.25) * 0.6;
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snow += snowLayer(uv, 0.5) * 0.7;
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snow += snowLayer(uv, 0.75) * 0.8;
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snow += snowLayer(uv, 1.0) * 1.0;
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snow = clamp(snow * (0.4 + density * 1.2), 0.0, 1.0);
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// Composite snow particles
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vec3 result = frosted + snow * 0.8 * intensity;
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// Subtle fog in lower areas
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float fog = smoothstep(0.0, 0.4, 1.0 - uv.y) * 0.1 * intensity;
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result = mix(result, vec3(0.85, 0.88, 0.95), fog);
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out_FragColor = vec4(mix(color.rgb, result, intensity), color.a);
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}
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`,
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};
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