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75 lines
2.0 KiB
GLSL
75 lines
2.0 KiB
GLSL
#ifdef GL_ES
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precision mediump float;
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#endif
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const float PI = 3.14159265359;
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const float SCALE = 0.0002;
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const float SPEED = 0.5;
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const float NOISE_FREQ = 3.5;
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const float NOISE_AMP = 0.3;
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varying vec2 vUv;
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varying float vHeight;
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varying float vColor;
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uniform float uTime;
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uniform sampler2D map;
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float rand(vec2 co, float l, float t) {
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return fract(sin(dot(co.xy + vec2(l, t), vec2(12.9898, 78.233))) * 43758.5453);
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}
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float perlin(vec2 p, float dim, float time) {
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vec2 pos = floor(p * dim);
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vec2 posx = pos + vec2(1.0, 0.0);
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vec2 posy = pos + vec2(0.0, 1.0);
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vec2 posxy = pos + vec2(1.0);
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float c = rand(pos, dim, time);
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float cx = rand(posx, dim, time);
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float cy = rand(posy, dim, time);
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float cxy = rand(posxy, dim, time);
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vec2 d = fract(p * dim);
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d = -0.5 * cos(d * PI) + 0.5;
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float ccx = mix(c, cx, d.x);
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float cycxy = mix(cy, cxy, d.x);
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float center = mix(ccx, cycxy, d.y);
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return center * 2.0 - 1.0;
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}
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float snoiseFoam(vec2 pos, const float freq) {
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return perlin(vec2(pos.y * freq, pos.x * freq), 9.0, 0.0);
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}
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float snoiseWater(vec2 pos, const float freq) {
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return perlin(vec2(pos.y * freq, pos.x * freq), 6.0, 0.0);
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}
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mat2 rotate2d(float _angle) {
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return mat2(cos(_angle), -sin(_angle), sin(_angle), cos(_angle));
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}
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void main() {
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vUv = uv;
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vec2 rTimeSpeed = vec2(uTime) * rotate2d(PI * (70.0 / 180.0)) * 0.15 * SPEED;
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vec2 rTimeSlow = vec2(uTime) * rotate2d(PI * (250.0 / 180.0)) * 0.1 * SPEED;
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vec2 rTimeMiddle = vec2(uTime + 100.0) * rotate2d(PI * (300.0 / 180.0)) * 0.12 * SPEED;
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vec2 freqPos = position.xy * SCALE * NOISE_FREQ;
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float waveBig = snoiseWater(freqPos + rTimeSlow, 0.08) * 0.4;
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float waveMiddle = snoiseFoam(freqPos + rTimeMiddle, 0.1) * 0.3;
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float waveSmall = snoiseFoam(freqPos + rTimeSpeed, 0.1) * 0.3;
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vColor = waveMiddle;
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vHeight = (waveBig + waveSmall + waveMiddle) * NOISE_AMP;
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vec3 pos = position;
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pos.z += vHeight / SCALE;
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gl_Position = projectionMatrix * modelViewMatrix * vec4(pos, 1.0);
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} |