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KodeLife fragment shader sketch
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#version 150 | |
uniform float time; | |
uniform sampler2D prevFrame; | |
uniform vec2 resolution; | |
uniform vec3 spectrum; | |
out vec4 fragColor; | |
vec3 fade(vec3 x) { return x * x * x * (x * (x * 6 - 15) + 10); } | |
vec3 phash(vec3 p) | |
{ | |
p = fract(mat3(1.2989833, 7.8233198, 2.3562332, | |
6.7598192, 3.4857334, 8.2837193, | |
2.9175399, 2.9884245, 5.4987265) * p); | |
p = ((2384.2345 * p - 1324.3438) * p + 3884.2243) * p - 4921.2354; | |
return normalize(fract(p) * 2 - 1); | |
} | |
float cnoise(vec3 p) | |
{ | |
vec3 ip = floor(p); | |
vec3 fp = fract(p); | |
float d000 = dot(phash(ip), fp); | |
float d001 = dot(phash(ip + vec3(0, 0, 1)), fp - vec3(0, 0, 1)); | |
float d010 = dot(phash(ip + vec3(0, 1, 0)), fp - vec3(0, 1, 0)); | |
float d011 = dot(phash(ip + vec3(0, 1, 1)), fp - vec3(0, 1, 1)); | |
float d100 = dot(phash(ip + vec3(1, 0, 0)), fp - vec3(1, 0, 0)); | |
float d101 = dot(phash(ip + vec3(1, 0, 1)), fp - vec3(1, 0, 1)); | |
float d110 = dot(phash(ip + vec3(1, 1, 0)), fp - vec3(1, 1, 0)); | |
float d111 = dot(phash(ip + vec3(1, 1, 1)), fp - vec3(1, 1, 1)); | |
fp = fade(fp); | |
return mix(mix(mix(d000, d001, fp.z), mix(d010, d011, fp.z), fp.y), | |
mix(mix(d100, d101, fp.z), mix(d110, d111, fp.z), fp.y), fp.x); | |
} | |
void main(void) | |
{ | |
vec2 uv = gl_FragCoord.xy / resolution; | |
float aspect = resolution.x / resolution.y; | |
// ellipse | |
float r = length((uv - 0.5) * vec2(aspect, 1)); | |
float c = 1 - step(spectrum.x, r); | |
c *= spectrum.x; | |
// displacement | |
vec3 np = vec3(uv * 8, time * 1.8); | |
float n0 = cnoise(np); | |
float n1 = cnoise(np + vec3(0.01, 0, 0)); | |
float n2 = cnoise(np + vec3(0, 0.01, 0)); | |
vec2 d = vec2(n2 - n0, n0 - n1) * 5; | |
uv += d / vec2(aspect, 1); | |
uv = (uv - 0.5) * 0.95 + 0.5; | |
// feedback | |
vec3 duv = vec3(4, 4, 0) / resolution.xyy; | |
c += texture(prevFrame, uv).r * 0.99; | |
// color gradient | |
float c1 = 0.5 - sin(c * 9.12 + time * 1.21) * 0.6; | |
float c2 = 0.5 - sin(c * 8.33 + time * 0.73) * 0.6; | |
fragColor = vec4(1, c1, c2, 0) * c; | |
} |
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