From 3f1f9ffc96540404eeb0e412114164dd0cf6c682 Mon Sep 17 00:00:00 2001
From: FMS-Cat <yutaka.obuchi@gmail.com>
Date: Fri, 26 Mar 2021 21:22:46 +0900
Subject: [PATCH] aesthetics: add noise in post pass, cheating the bloom
 banding

---
 src/entities/Post.ts  |  2 ++
 src/shaders/post.frag | 10 +++++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/entities/Post.ts b/src/entities/Post.ts
index afda106..687df28 100644
--- a/src/entities/Post.ts
+++ b/src/entities/Post.ts
@@ -7,6 +7,7 @@ import quadVert from '../shaders/quad.vert';
 import { BufferRenderTarget } from '../heck/BufferRenderTarget';
 import { quadGeometry } from '../globals/quadGeometry';
 import { dummyRenderTarget } from '../globals/dummyRenderTarget';
+import { randomTexture } from '../globals/randomTexture';
 
 export interface PostOptions {
   input: BufferRenderTarget;
@@ -26,6 +27,7 @@ export class Post extends Entity {
       { initOptions: { geometry: quadGeometry, target: dummyRenderTarget } },
     );
     material.addUniformTexture( 'sampler0', options.input.texture );
+    material.addUniformTexture( 'samplerRandom', randomTexture.texture );
 
     if ( process.env.DEV ) {
       if ( module.hot ) {
diff --git a/src/shaders/post.frag b/src/shaders/post.frag
index f948cdf..9b0f2f4 100644
--- a/src/shaders/post.frag
+++ b/src/shaders/post.frag
@@ -19,6 +19,9 @@ out vec4 fragColor;
 uniform float time;
 uniform vec2 resolution;
 uniform sampler2D sampler0;
+uniform sampler2D samplerRandom;
+
+#pragma glslify: prng = require( ./-prng );
 
 vec3 colorMap( vec3 i ) {
   return vec3(
@@ -58,7 +61,12 @@ void main() {
 
   tex = mix( vec3( 0.0 ), tex, vig );
 
-  vec3 col = pow( saturate( tex.xyz ), vec3( 0.4545 ) );
+  vec3 col = tex.xyz;
+  vec4 seed = texture( samplerRandom, uv );
+  prng( seed );
+  prng( seed );
+  col += ( pow( prng( seed ), 2.2 ) - 0.25 ) * 0.002;
+  col = pow( saturate( col ), vec3( 0.4545 ) );
   col.x = linearstep( 0.0, 1.2, col.x + 0.2 * uv.y );
   col.z = linearstep( -0.1, 1.0, col.z );
   col = colorMap( col );