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https://gitlab.com/veloren/veloren.git
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51 lines
1.6 KiB
GLSL
51 lines
1.6 KiB
GLSL
uniform sampler2D t_noise;
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float hash(vec4 p) {
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p = fract(p * 0.3183099 + 0.1) - fract(p + 23.22121);
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p *= 17.0;
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return (fract(p.x * p.y * p.z * p.w * (p.x + p.y + p.z + p.w)) - 0.5) * 2.0;
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}
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float snoise(in vec4 x) {
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vec4 p = floor(x);
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vec4 f = fract(x);
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f = f * f * (3.0 - 2.0 * f);
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return mix(
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mix(
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mix(
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mix(hash(p + vec4(0,0,0,0)), hash(p + vec4(1,0,0,0)), f.x),
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mix(hash(p + vec4(0,1,0,0)), hash(p + vec4(1,1,0,0)), f.x),
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f.y),
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mix(
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mix(hash(p + vec4(0,0,1,0)), hash(p + vec4(1,0,1,0)), f.x),
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mix(hash(p + vec4(0,1,1,0)), hash(p + vec4(1,1,1,0)), f.x),
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f.y),
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f.z),
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mix(
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mix(
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mix(hash(p + vec4(0,0,0,1)), hash(p + vec4(1,0,0,1)), f.x),
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mix(hash(p + vec4(0,1,0,1)), hash(p + vec4(1,1,0,1)), f.x),
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f.y),
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mix(
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mix(hash(p + vec4(0,0,1,1)), hash(p + vec4(1,0,1,1)), f.x),
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mix(hash(p + vec4(0,1,1,1)), hash(p + vec4(1,1,1,1)), f.x),
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f.y),
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f.z),
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f.w);
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}
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vec3 rand_perm_3(vec3 pos) {
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return abs(sin(pos * vec3(1473.7 * pos.z + 472.3, 8891.1 * pos.x + 723.1, 3813.3 * pos.y + 982.5)));
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}
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vec4 rand_perm_4(vec4 pos) {
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return sin(473.3 * pos * vec4(317.3 * pos.w + 917.7, 1473.7 * pos.z + 472.3, 8891.1 * pos.x + 723.1, 3813.3 * pos.y + 982.5) / pos.yxwz);
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}
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vec3 smooth_rand(vec3 pos, float lerp_axis) {
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return vec3(snoise(vec4(pos, lerp_axis)), snoise(vec4(pos + 400.0, lerp_axis)), snoise(vec4(pos + 1000.0, lerp_axis)));
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vec3 r0 = rand_perm_3(vec3(pos.x, pos.y, pos.z) + floor(lerp_axis));
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vec3 r1 = rand_perm_3(vec3(pos.x, pos.y, pos.z) + floor(lerp_axis + 1.0));
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return r0 + (r1 - r0) * fract(lerp_axis);
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}
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