From f6c7abf8dcbff4f308c421470f232a007be02adf Mon Sep 17 00:00:00 2001
From: Andras Schmelczer <andras@schmelczer.dev>
Date: Sun, 30 Apr 2023 16:01:55 +0100
Subject: [PATCH] Improve rendering

---
 src/pipelines/render/render.wgsl | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/src/pipelines/render/render.wgsl b/src/pipelines/render/render.wgsl
index 18c8d82..3fc886b 100644
--- a/src/pipelines/render/render.wgsl
+++ b/src/pipelines/render/render.wgsl
@@ -8,20 +8,28 @@ struct Settings {
 };
 
 @group(0) @binding(0) var<uniform> settings: Settings;
-@group(0) @binding(1) var mySampler: sampler;
-@group(0) @binding(2) var TargetTexture: texture_2d<f32>;
+@group(0) @binding(1) var Sampler: sampler;
+@group(0) @binding(2) var trailMap: texture_2d<f32>;
+@group(0) @binding(3) var noiseMap: texture_2d<f32>;
 
 @fragment
 fn fragment(@location(0) uv: vec2<f32>) -> @location(0) vec4<f32> {
-  let traces = textureSample(TargetTexture, mySampler, uv);
+  let traces = textureSample(trailMap, Sampler, uv);
+  let noise = textureSample(noiseMap, Sampler, uv);
 
   let speciesAStrength = traces.r;
   let speciesBStrength = traces.g;
   let brushStrength = traces.a;
-  return vec4(
+
+  let rgbColor = sqrt(vec3(
     settings.speciesColorA * speciesAStrength +
     settings.speciesColorB * speciesBStrength +
-    settings.brushColor * brushStrength,
-    1
-  );
+    settings.brushColor * brushStrength
+  ));
+
+
+  let bg = vec3(0.9) + 0.2 * (noise.r - 0.5);
+  
+  
+  return vec4(bg - rgbColor, 1);
 }