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postprocess: Replace IGN with more white-noise-like noise

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IGN gives visible patterns when zooming in or increasing noise amount.
This commit is contained in:
Ivan Molodetskikh
2026-04-15 21:26:29 +03:00
parent 4d21489101
commit 707f08559c
1 changed files with 7 additions and 5 deletions
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src/render_helpers/shaders/postprocess.frag
+7 -5
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@@ -2,10 +2,12 @@ uniform float noise;
uniform float saturation; uniform float saturation;
uniform vec4 bg_color; uniform vec4 bg_color;
// Interleaved Gradient Noise // Sin-less white noise by David Hoskins (MIT License).
float gradient_noise(vec2 uv) { // https://www.shadertoy.com/view/4djSRW
const vec3 magic = vec3(0.06711056, 0.00583715, 52.9829189); float hash12(vec2 p) {
return fract(magic.z * fract(dot(uv, magic.xy))); vec3 p3 = fract(vec3(p.xyx) * 0.1031);
p3 += dot(p3, p3.yzx + 33.33);
return fract((p3.x + p3.y) * p3.z);
} }
vec3 saturate(vec3 color, float sat) { vec3 saturate(vec3 color, float sat) {
@@ -20,7 +22,7 @@ vec4 postprocess(vec4 color) {
if (noise > 0.0) { if (noise > 0.0) {
vec2 uv = gl_FragCoord.xy; vec2 uv = gl_FragCoord.xy;
color.rgb += (gradient_noise(uv) - 0.5) * noise; color.rgb += (hash12(uv) - 0.5) * noise;
} }
// Mix bg_color behind the texture (both premultiplied alpha). // Mix bg_color behind the texture (both premultiplied alpha).