Refactor and improve brush

src/pipelines/diffusion/diffuse.wgsl

@@ -5,8 +5,6 @@ struct Settings {
   
   diffusionRate : f32,
   decayRate : f32,
-  swipeRadius : f32,
-  swipeBlur : f32,
 };
 
 @group(0) @binding(0) var<uniform> settings : Settings;
@@ -24,9 +22,11 @@ fn fragment(@location(0) uv: vec2<f32>) -> @location(0) vec4<f32> {
     + textureSample(trailMap, Sampler, uv + vec2<f32>(1, 0) / settings.size)
   );
 
-  return mix(
+  let mixed = mix(
     current,
     neighbours / 4.0,
     settings.diffusionRate
   ) * (1.0 - settings.decayRate);
+
+  return clamp(mixed, vec4(0), vec4(1));
 }

src/pipelines/diffusion/diffusion-pipeline.ts

@@ -1,4 +1,5 @@
-import { setUpFullScreenQuad } from '../../utils/full-screen-quad';
+import { setUpFullScreenQuad } from '../../utils/graphics/full-screen-quad/full-screen-quad';
+import { smartCompile } from '../../utils/smart-compile';
 import { CommonParameters } from '../common-parameters';
 import shader from './diffuse.wgsl';
 import { DiffusionSettings } from './diffusion-settings';
@@ -21,9 +22,7 @@ export class DiffusionPipeline {
       layout: 'auto',
       vertex,
       fragment: {
-        module: device.createShaderModule({
-          code: shader,
-        }),
+        module: smartCompile(device, shader),
         entryPoint: 'fragment',
         targets: [
           {
@@ -48,8 +47,6 @@ export class DiffusionPipeline {
     time,
     diffusionRate,
     decayRate,
-    swipeRadius,
-    swipeBlur,
   }: CommonParameters & DiffusionSettings) {
     this.device.queue.writeBuffer(
       this.uniforms,
@@ -61,8 +58,6 @@ export class DiffusionPipeline {
         time,
         diffusionRate,
         decayRate,
-        swipeRadius,
-        swipeBlur,
       ])
     );
   }

src/pipelines/diffusion/diffusion-settings.ts

@@ -1,6 +1,4 @@
 export interface DiffusionSettings {
   diffusionRate: number;
   decayRate: number;
-  swipeRadius: number;
-  swipeBlur: number;
 }