f9186bfab0
The noise was a flat plus or minus 0.001 added to the whole tile, while the OpenGL renderer adds up to plus or minus 0.004, modulated by luminance so that dark areas get more of it, and only to the blurred background. The noise texture encoding is back to the one that decoder expects too, the values it holds reach beyond the [-1, 1] the previous encoding assumed and were clipped. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
75 lines
2.6 KiB
GLSL
75 lines
2.6 KiB
GLSL
#version 450
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layout(location = 0) in vec2 v_texcoord;
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layout(location = 0) out vec4 fragColor;
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const float permTexUnit = 1.0 / 256.0;
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const float permTexUnitHalf = 0.5 / 256.0;
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const float grainsize = 1.3;
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const float noiseCoordRotation = 1.425;
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const vec2 dimensions = vec2(256.0, 256.0);
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layout(binding = 1) uniform sampler2D p_texture;
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vec4 rnm(vec2 tc) {
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float noise = sin(dot(tc, vec2(12.9898, 78.233))) * 43758.5453;
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float noiseR = fract(noise) * 2.0 - 1.0;
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float noiseG = fract(noise * 1.2154) * 2.0 - 1.0;
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float noiseB = fract(noise * 1.3453) * 2.0 - 1.0;
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float noiseA = fract(noise * 1.4651) * 2.0 - 1.0;
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return vec4(noiseR, noiseG, noiseB, noiseA);
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}
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float fade(float t) {
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return t * t * t * (t * (t * 6.0 - 15.0) + 10.0);
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}
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float pnoise3D(vec3 p) {
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vec3 pi = permTexUnit * floor(p) + permTexUnitHalf;
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vec3 pf = fract(p);
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float perm00 = rnm(pi.xy).a;
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vec3 grad000 = rnm(vec2(perm00, pi.z)).rgb * 4.0 - 1.0;
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float n000 = dot(grad000, pf);
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vec3 grad001 = rnm(vec2(perm00, pi.z + permTexUnit)).rgb * 4.0 - 1.0;
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float n001 = dot(grad001, pf - vec3(0.0, 0.0, 1.0));
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float perm01 = rnm(pi.xy + vec2(0.0, permTexUnit)).a;
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vec3 grad010 = rnm(vec2(perm01, pi.z)).rgb * 4.0 - 1.0;
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float n010 = dot(grad010, pf - vec3(0.0, 1.0, 0.0));
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vec3 grad011 = rnm(vec2(perm01, pi.z + permTexUnit)).rgb * 4.0 - 1.0;
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float n011 = dot(grad011, pf - vec3(0.0, 1.0, 1.0));
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float perm10 = rnm(pi.xy + vec2(permTexUnit, 0.0)).a;
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vec3 grad100 = rnm(vec2(perm10, pi.z)).rgb * 4.0 - 1.0;
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float n100 = dot(grad100, pf - vec3(1.0, 0.0, 0.0));
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vec3 grad101 = rnm(vec2(perm10, pi.z + permTexUnit)).rgb * 4.0 - 1.0;
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float n101 = dot(grad101, pf - vec3(1.0, 0.0, 1.0));
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float perm11 = rnm(pi.xy + vec2(permTexUnit, permTexUnit)).a;
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vec3 grad110 = rnm(vec2(perm11, pi.z)).rgb * 4.0 - 1.0;
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float n110 = dot(grad110, pf - vec3(1.0, 1.0, 0.0));
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vec3 grad111 = rnm(vec2(perm11, pi.z + permTexUnit)).rgb * 4.0 - 1.0;
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float n111 = dot(grad111, pf - vec3(1.0, 1.0, 1.0));
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vec4 n_x = mix(
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vec4(n000, n001, n010, n011),
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vec4(n100, n101, n110, n111),
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fade(pf.x));
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vec2 n_xy = mix(n_x.xy, n_x.zw, fade(pf.y));
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float n_xyz = mix(n_xy.x, n_xy.y, fade(pf.z));
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return n_xyz;
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}
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vec2 rotateTexCoords(vec2 tc, float angle) {
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tc -= 0.5;
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float s = sin(angle);
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float c = cos(angle);
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tc = mat2(c, -s, s, c) * tc;
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tc += 0.5;
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return tc;
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}
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void main() {
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vec2 texCoord = v_texcoord * dimensions / grainsize;
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vec2 rotated = rotateTexCoords(texCoord, noiseCoordRotation);
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float noise = pnoise3D(vec3(rotated, 0.0));
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// The consumer decodes this back with value * 4 - 2, the values
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// are almost always within [-2, 2].
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fragColor = vec4(clamp((noise + 2.0) * 0.25, 0.0, 1.0));
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}
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