mirror of
https://github.com/Ttanasart-pt/Pixel-Composer.git
synced 2024-09-21 12:52:43 +02:00
85 lines
2.9 KiB
GLSL
85 lines
2.9 KiB
GLSL
//
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// Simple passthrough fragment shader
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//
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varying vec2 v_vTexcoord;
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varying vec4 v_vColour;
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uniform vec2 position;
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uniform vec2 u_resolution;
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uniform vec2 scale;
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uniform int iteration;
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uniform float seed;
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uniform int tile;
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uniform int colored;
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uniform vec2 colorRanR;
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uniform vec2 colorRanG;
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uniform vec2 colorRanB;
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vec3 hsv2rgb(vec3 c) {
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vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
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vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
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return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
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}
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float random (in vec2 st, float seed) {
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return fract(sin(dot(st.xy + vec2(21.4564, 46.8564), vec2(12.9898, 78.233))) * (43758.5453123 + seed));
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}
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float noise (in vec2 st, in vec2 scale) {
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vec2 cellMin = tile == 1? mod(floor(st), scale) : floor(st);
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vec2 cellMax = tile == 1? mod(floor(st) + vec2(1., 1.), scale) : floor(st) + vec2(1., 1.);
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vec2 f = fract(st);
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// Four corners in 2D of a tile
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float sedSt = floor(seed);
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float sedFr = fract(seed);
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float a = mix(random(vec2(cellMin.x, cellMin.y), sedSt), random(vec2(cellMin.x, cellMin.y), sedSt + 1.), sedFr);
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float b = mix(random(vec2(cellMax.x, cellMin.y), sedSt), random(vec2(cellMax.x, cellMin.y), sedSt + 1.), sedFr);
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float c = mix(random(vec2(cellMin.x, cellMax.y), sedSt), random(vec2(cellMin.x, cellMax.y), sedSt + 1.), sedFr);
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float d = mix(random(vec2(cellMax.x, cellMax.y), sedSt), random(vec2(cellMax.x, cellMax.y), sedSt + 1.), sedFr);
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// Cubic Hermine Curve. Same as SmoothStep()
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vec2 u = f * f * (3.0 - 2.0 * f);
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// Mix 4 coorners percentages
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return mix(mix(a, b, u.x), mix(c, d, u.x), u.y);
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}
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float perlin(in vec2 st) {
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float amp = pow(2., float(iteration) - 1.) / (pow(2., float(iteration)) - 1.);
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float n = 0.;
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vec2 pos = st;
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vec2 sc = scale;
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for(int i = 0; i < iteration; i++) {
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n += noise(pos, sc) * amp;
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sc *= 2.;
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amp *= .5;
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pos *= 2.;
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}
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return n;
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}
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void main() {
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if(colored == 0) {
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vec2 pos = (v_vTexcoord + position) * scale;
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gl_FragColor = vec4(vec3(perlin(pos)), 1.0);
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} else if(colored == 1) {
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float randR = colorRanR[0] + perlin((v_vTexcoord + position) * scale) * (colorRanR[1] - colorRanR[0]);
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float randG = colorRanG[0] + perlin((v_vTexcoord + position + vec2(1.7227, 4.55529)) * scale) * (colorRanG[1] - colorRanG[0]);
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float randB = colorRanB[0] + perlin((v_vTexcoord + position + vec2(6.9950, 6.82063)) * scale) * (colorRanB[1] - colorRanB[0]);
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gl_FragColor = vec4(randR, randG, randB, 1.0);
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} else if(colored == 2) {
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float randH = colorRanR[0] + perlin((v_vTexcoord + position) * scale) * (colorRanR[1] - colorRanR[0]);
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float randS = colorRanG[0] + perlin((v_vTexcoord + position + vec2(1.7227, 4.55529)) * scale) * (colorRanG[1] - colorRanG[0]);
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float randV = colorRanB[0] + perlin((v_vTexcoord + position + vec2(6.9950, 6.82063)) * scale) * (colorRanB[1] - colorRanB[0]);
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gl_FragColor = vec4(hsv2rgb(vec3(randH, randS, randV)), 1.0);
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}
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}
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