Add resizing

src/game-loop/game-loop.ts

@@ -6,6 +6,7 @@ import { DiffusionPipeline } from '../pipelines/diffusion/diffusion-pipeline';
 import { RenderPipeline } from '../pipelines/render/render-pipeline';
 import { settings } from '../settings';
 import { DeltaTimeCalculator } from '../utils/delta-time-calculator';
+import { ResizableTexture } from '../utils/graphics/resizable-texture';
 import { sleep } from '../utils/sleep';
 import { spawnAgents } from './spawn-agents';
 
@@ -14,6 +15,8 @@ import { vec2 } from 'gl-matrix';
 export default class GameLoop {
   private readonly deltaTimeCalculator = new DeltaTimeCalculator();
 
+  private readonly trailMapA: ResizableTexture;
+  private readonly trailMapB: ResizableTexture;
   private readonly commonState: CommonState;
   private readonly copyPipeline: CopyPipeline;
   private readonly agentPipeline: AgentPipeline;
@@ -21,11 +24,6 @@ export default class GameLoop {
   private readonly brushPipeline: BrushPipeline;
   private readonly diffusionPipeline: DiffusionPipeline;
 
-  private trailMapA?: GPUTexture;
-  private trailMapB?: GPUTexture;
-  private trailMapAView?: GPUTextureView;
-  private trailMapBView?: GPUTextureView;
-
   private hasFinished = false;
   private readonly hasFinishedPromise: Promise<void> = new Promise(
     (resolve) => (this.resolveHasFinished = resolve)
@@ -45,6 +43,8 @@ export default class GameLoop {
       alphaMode: 'premultiplied',
     });
 
+    this.trailMapA = new ResizableTexture(this.device, this.canvasSize);
+    this.trailMapB = new ResizableTexture(this.device, this.canvasSize);
     this.resize();
 
     this.commonState = new CommonState(this.device);
@@ -60,8 +60,8 @@ export default class GameLoop {
 
     window.addEventListener('resize', this.resize.bind(this));
 
-    window.addEventListener('mousemove', this.onSwipe.bind(this));
-    window.addEventListener('mousedown', (e) => {
+    canvas.addEventListener('mousemove', this.onSwipe.bind(this));
+    canvas.addEventListener('mousedown', (e) => {
       this.brushPipeline.clearSwipes();
       this.isSwipeActive = true;
       this.onSwipe(e);
@@ -91,31 +91,6 @@ export default class GameLoop {
     const devicePixelRatio = window.devicePixelRatio || 1;
     this.canvas.width = this.canvas.clientWidth * devicePixelRatio;
     this.canvas.height = this.canvas.clientHeight * devicePixelRatio;
-
-    this.trailMapA?.destroy();
-    this.trailMapA = this.createTrailMap();
-    this.trailMapAView = this.trailMapA.createView();
-
-    this.trailMapB?.destroy();
-    this.trailMapB = this.createTrailMap();
-    this.trailMapBView = this.trailMapB.createView();
-  }
-
-  private createTrailMap(): GPUTexture {
-    return this.device.createTexture({
-      format: 'rgba16float',
-      dimension: '2d',
-      mipLevelCount: 1,
-      size: {
-        width: this.canvas.width,
-        height: this.canvas.height,
-        depthOrArrayLayers: 1,
-      },
-      usage:
-        GPUTextureUsage.STORAGE_BINDING |
-        GPUTextureUsage.TEXTURE_BINDING |
-        GPUTextureUsage.RENDER_ATTACHMENT,
-    });
   }
 
   private async render(time: DOMHighResTimeStamp) {
@@ -137,15 +112,23 @@ export default class GameLoop {
     const commandEncoder = this.device.createCommandEncoder();
 
     for (let i = 0; i < settings.renderSpeed; i++) {
-      this.copyPipeline.execute(commandEncoder, this.trailMapAView, this.trailMapBView);
-      this.brushPipeline.execute(commandEncoder, this.trailMapBView);
-      this.agentPipeline.execute(commandEncoder, this.trailMapAView, this.trailMapBView);
+      this.copyPipeline.execute(
+        commandEncoder,
+        this.trailMapA.getTextureView(),
+        this.trailMapB.getTextureView()
+      );
+      this.brushPipeline.execute(commandEncoder, this.trailMapB.getTextureView());
+      this.agentPipeline.execute(
+        commandEncoder,
+        this.trailMapA.getTextureView(),
+        this.trailMapB.getTextureView()
+      );
       this.diffusionPipeline.execute(
         commandEncoder,
-        this.trailMapBView,
-        this.trailMapAView
+        this.trailMapB.getTextureView(),
+        this.trailMapA.getTextureView()
       );
-      this.renderPipeline.execute(commandEncoder, this.trailMapAView);
+      this.renderPipeline.execute(commandEncoder, this.trailMapA.getTextureView());
     }
 
     this.device.queue.submit([commandEncoder.finish()]);
@@ -157,6 +140,11 @@ export default class GameLoop {
     if (settings.simulatedDelayMs > 0) {
       await sleep(settings.simulatedDelayMs);
     }
+
+    // avoid resizing during rendering
+    this.trailMapA.resize(this.canvasSize);
+    this.trailMapB.resize(this.canvasSize);
+
     requestAnimationFrame(this.render.bind(this));
   }
 

src/game-loop/spawn-agents.ts

@@ -6,22 +6,19 @@ import { vec2 } from 'gl-matrix';
 
 export const spawnAgents = (canvasSize: vec2, agentCount: number): Array<Agent> => {
   const minSize = Math.min(...canvasSize);
-  const ratio = Math.max(...canvasSize) / minSize;
-  const size = vec2.scale(vec2.create(), canvasSize, 1 / minSize);
-  vec2.normalize(size, size);
+  const center = vec2.scale(vec2.create(), canvasSize, 0.5);
+
   return new Array(agentCount).fill(0).map(() => {
-    const radius = Random.randomBetween(0, settings.startingRadius / ratio);
+    const radius = Random.randomBetween(0, minSize * settings.startingRadius);
     const angle = Random.randomBetween(0, Math.PI * 2);
-    const center = vec2.fromValues(0.5, 0.5);
 
     const delta = vec2.fromValues(Math.cos(angle) * radius, Math.sin(angle) * radius);
-    vec2.divide(delta, delta, size);
 
     const position = vec2.add(vec2.create(), center, delta);
 
     return {
       position,
-      angle: angle + Math.PI,
+      direction: vec2.fromValues(Math.cos(angle + Math.PI), Math.sin(angle + Math.PI)),
       species: 0,
       timeToLive: Random.randomBetween(10, 15000),
     };

src/pipelines/agents/agent-pipeline.ts

@@ -51,12 +51,10 @@ export class AgentPipeline {
 
     new Float32Array(this.agentsBuffer.getMappedRange()).set(
       agents.flatMap((agent) => [
-        agent.position[0],
-        agent.position[1],
-        agent.angle,
+        ...agent.position,
+        ...agent.direction,
         agent.species,
         agent.timeToLive,
-        0, // padding
       ])
     );
     this.agentsBuffer.unmap();
@@ -66,8 +64,8 @@ export class AgentPipeline {
     brushTrailWeight,
     moveSpeed,
     turnSpeed,
-    sensorAngleDegrees,
-    sensorOffsetDst,
+    sensorOffsetAngle,
+    sensorOffsetDistance,
   }: AgentSettings) {
     this.device.queue.writeBuffer(
       this.uniforms,
@@ -76,8 +74,8 @@ export class AgentPipeline {
         brushTrailWeight,
         moveSpeed,
         turnSpeed,
-        (sensorAngleDegrees * Math.PI) / 180,
-        sensorOffsetDst,
+        (sensorOffsetAngle * Math.PI) / 180,
+        sensorOffsetDistance,
       ])
     );
   }

src/pipelines/agents/agent-settings.ts

@@ -2,6 +2,6 @@ export interface AgentSettings {
   brushTrailWeight: number;
   moveSpeed: number;
   turnSpeed: number;
-  sensorAngleDegrees: number;
-  sensorOffsetDst: number;
+  sensorOffsetAngle: number;
+  sensorOffsetDistance: number;
 }

src/pipelines/agents/agent.ts

@@ -2,7 +2,7 @@ import { vec2 } from 'gl-matrix';
 
 export interface Agent {
   position: vec2;
-  angle: number;
+  direction: vec2;
   species: number;
   timeToLive: number;
 }

src/pipelines/agents/agent.wgsl

@@ -1,6 +1,6 @@
 struct Agent {
   position: vec2<f32>,
-  angle: f32,
+  direction: vec2<f32>,
   species: f32,
   timeToLive: f32
 }
@@ -15,10 +15,10 @@ struct Settings {
 
 @group(1) @binding(0) var<uniform> settings: Settings;
 @group(1) @binding(1) var<storage, read_write> agents: array<Agent>;
-@group(1) @binding(2) var TrailMapIn: texture_2d<f32>;
-@group(1) @binding(3) var TrailMapOut: texture_storage_2d<rgba16float, write>;
+@group(1) @binding(2) var trailMapIn: texture_2d<f32>;
+@group(1) @binding(3) var trailMapOut: texture_storage_2d<rgba16float, write>;
 
-@compute @workgroup_size(8, 8)
+@compute @workgroup_size(64)
 fn main(@builtin(global_invocation_id) global_id: vec3<u32>) {
   let id = global_id.x;
 
@@ -29,20 +29,20 @@ fn main(@builtin(global_invocation_id) global_id: vec3<u32>) {
   var agent = agents[id];
 
   if (agent.timeToLive <= 0.) {
-    agent.position = vec2(
-      random_with_seed(agent.position, f32(id) + state.time),
-      random_with_seed(agent.position, f32(id) + state.time + 12),
-    );
-    agent.angle = random_with_seed(vec2(agent.angle), f32(id) + state.time);
-    agent.species = 1;
-    agent.timeToLive = 1000;
-    agents[id] = agent;
+    // agent.position = vec2(
+    //   random_with_seed(agent.position, f32(id) + state.time),
+    //   random_with_seed(agent.position, f32(id) + state.time + 12),
+    // );
+    // agent.angle = random_with_seed(vec2(agent.angle), f32(id) + state.time);
+    // agent.species = 1;
+    // agent.timeToLive = 1000;
+    // agents[id] = agent;
     return;
   }
 
   let random = random_with_seed(agent.position, f32(id) + state.time);
+  let trailCurrent = textureLoad(trailMapIn, vec2<i32>(agent.position), 0);
 
-  let trailCurrent = sense(agent, 0, 0);
   var weight: f32;
   if(agent.species == 0) {
     weight = trailCurrent.r - trailCurrent.g;
@@ -53,10 +53,11 @@ fn main(@builtin(global_invocation_id) global_id: vec3<u32>) {
     agent.timeToLive = 0;
     return;
   }
+
   
-  let trailForward = sense(agent, settings.sensorOffset, 0);
-  let trailLeft = sense(agent, settings.sensorOffset, settings.sensorAngle);
-  let trailRight = sense(agent, settings.sensorOffset, -settings.sensorAngle);
+  let trailForward = sense(agent.position, agent.direction, settings.sensorOffset, 0);
+  let trailLeft = sense(agent.position, agent.direction, settings.sensorOffset, settings.sensorAngle);
+  let trailRight = sense(agent.position, agent.direction, settings.sensorOffset, -settings.sensorAngle);
 
   var weightForward: f32 = trailForward.a * settings.brushTrailWeight;
   var weightLeft: f32 = trailLeft.a * settings.brushTrailWeight;
@@ -71,42 +72,44 @@ fn main(@builtin(global_invocation_id) global_id: vec3<u32>) {
     weightRight += trailRight.g - trailRight.r;
   }
 
+  var rotation: f32 = 0;
   if (weightForward < weightLeft && weightForward < weightRight) {
-    agent.angle += (random - 0.5) * 2. * settings.turnRate * state.deltaTime;
+    rotation = (random - 0.5) * 2. * settings.turnRate * state.deltaTime;
   } else if (weightLeft < weightRight) {
-    agent.angle -= random * settings.turnRate * state.deltaTime;
+    rotation = random * -settings.turnRate * state.deltaTime;
   } else if (weightRight < weightLeft) {
-    agent.angle += random * settings.turnRate * state.deltaTime;
+    rotation = random * settings.turnRate * state.deltaTime;
   }
 
-  let direction = vec2(cos(agent.angle), sin(agent.angle));
-  var newPos = agent.position + direction / normalize(state.size) * settings.moveRate * state.deltaTime;
-  newPos = clamp(newPos, vec2<f32>(0, 0), vec2<f32>(1, 1));
-  if (newPos.x == 0. || newPos.x == 1. || newPos.y == 0. || newPos.y == 1.) {
-    agent.angle += 3.14159265359 + random - 0.5;
+  var nextDirection = agent.direction * mat2x2<f32>(cos(rotation), sin(rotation), -sin(rotation), cos(rotation));
+
+  var nextPosition = agent.position + agent.direction * settings.moveRate * state.deltaTime;
+  nextPosition = clamp(nextPosition, vec2<f32>(0, 0), state.size);
+  if nextPosition.x == 0 || nextPosition.x == state.size.x || nextPosition.y == 0 || nextPosition.y == state.size.y {
+    rotation = 3.14159265359 + random - 0.5;
+    nextDirection = agent.direction * mat2x2<f32>(cos(rotation), sin(rotation), -sin(rotation), cos(rotation));
   }
 
   var trail = vec4<f32>(0, 1, 0, 0);
   if (agent.species == 0) {
-    trail = vec4(1, 0, 0, 0);
+    trail = vec4(0.1, 0, 0, 0);
   }
-  textureStore(TrailMapOut, vec2<i32>(newPos * state.size), trail);
 
-  agent.position = newPos;
+  let current = textureLoad(trailMapIn, vec2<i32>(nextPosition), 0); 
+  textureStore(trailMapOut, vec2<i32>(nextPosition), vec4(trail.rgb + current.rgb, 0));
+
+  agent.position = nextPosition;
+  agent.direction = nextDirection;
   agent.timeToLive -= state.deltaTime;
   agents[id] = agent;
 }
 
-fn sense(agent: Agent, sensorOffset: f32, sensorOffsetAngle: f32) -> vec4<f32> {
-  let sensorAngle = agent.angle + sensorOffsetAngle;
-
-  let sensorDir: vec2<f32> = vec2(cos(sensorAngle), sin(sensorAngle)) / normalize(state.size);
-  let sensorPos: vec2<f32> = agent.position + sensorDir * sensorOffset;
-  return textureLoad(TrailMapIn, vec2<i32>(sensorPos * state.size), 0); 
+fn sense(agentPosition: vec2<f32>, agentDirection: vec2<f32>, sensorOffset: f32, sensorOffsetAngle: f32) -> vec4<f32> {
+  let sensorDirection = agentDirection * mat2x2<f32>(cos(sensorOffsetAngle), sin(sensorOffsetAngle), -sin(sensorOffsetAngle), cos(sensorOffsetAngle));
+  let sensorPosition = vec2<i32>(agentPosition + sensorDirection * sensorOffset);
+  return textureLoad(trailMapIn, sensorPosition, 0); 
 }
 
-
 fn random_with_seed(uv: vec2<f32>, seed: f32) -> f32 {
   return fract(sin(dot(uv, vec2(12.9898 + seed, 78.233 + seed)))* 43758.5453123 + seed);
 }
-

src/pipelines/copy/copy-pipeline.ts

@@ -1,10 +1,17 @@
 import { setUpFullScreenQuad } from '../../utils/graphics/full-screen-quad/full-screen-quad';
 import { smartCompile } from '../../utils/graphics/smart-compile';
+import shader from './copy.wgsl';
+
+import { vec2 } from 'gl-matrix';
 
 export class CopyPipeline {
+  private static readonly UNIFORM_COUNT = 2;
+
   private readonly bindGroupLayout: GPUBindGroupLayout;
   private readonly pipeline: GPURenderPipeline;
-  private readonly quadVertexBuffer: GPUBuffer;
+  private readonly uniforms: GPUBuffer;
+
+  private readonly vertexBuffer: GPUBuffer;
 
   private bindGroup?: GPUBindGroup;
   private previousTrailMapIn?: GPUTextureView;
@@ -12,26 +19,50 @@ export class CopyPipeline {
   public constructor(private readonly device: GPUDevice) {
     this.bindGroupLayout = device.createBindGroupLayout(CopyPipeline.bindGroupLayout);
 
-    const { buffer, vertex } = setUpFullScreenQuad(device);
-    this.quadVertexBuffer = buffer;
+    this.uniforms = this.device.createBuffer({
+      size: CopyPipeline.UNIFORM_COUNT * Float32Array.BYTES_PER_ELEMENT,
+      usage: GPUBufferUsage.UNIFORM | GPUBufferUsage.COPY_DST,
+    });
+
+    this.vertexBuffer = device.createBuffer({
+      size: 2 * 4 * Float32Array.BYTES_PER_ELEMENT, // 4 x vec2<f32>
+      usage: GPUBufferUsage.VERTEX,
+      mappedAtCreation: true,
+    });
+    // prettier-ignore
+    const vertexData = [
+    // U    V
+      0.0, 1.0,
+      1.0, 1.0,
+      0.0, 0.0,
+      1.0, 0.0,
+    ];
+    new Float32Array(this.vertexBuffer.getMappedRange()).set(vertexData);
+    this.vertexBuffer.unmap();
 
     this.pipeline = device.createRenderPipeline({
       layout: device.createPipelineLayout({
         bindGroupLayouts: [this.bindGroupLayout],
       }),
-      vertex,
+      vertex: {
+        module: smartCompile(device, shader),
+        entryPoint: 'vertex',
+        buffers: [
+          {
+            arrayStride: 2 * Float32Array.BYTES_PER_ELEMENT,
+            stepMode: 'vertex',
+            attributes: [
+              {
+                shaderLocation: 0,
+                offset: 0,
+                format: 'float32x2',
+              },
+            ],
+          },
+        ],
+      },
       fragment: {
-        module: smartCompile(
-          device,
-          /* wgsl */ `
-          @group(0) @binding(0) var Sampler: sampler;
-          @group(0) @binding(1) var original: texture_2d<f32>;
-
-          @fragment
-          fn fragment(@location(0) uv: vec2<f32>) -> @location(0) vec4<f32> {
-              return textureSample(original, Sampler, uv);
-          }`
-        ),
+        module: smartCompile(device, shader),
         entryPoint: 'fragment',
         targets: [
           {
@@ -48,8 +79,11 @@ export class CopyPipeline {
   public execute(
     commandEncoder: GPUCommandEncoder,
     trailMapIn: GPUTextureView,
-    trailMapOut: GPUTextureView
+    trailMapOut: GPUTextureView,
+    scale: vec2 = vec2.fromValues(1, 1)
   ) {
+    this.device.queue.writeBuffer(this.uniforms, 0, new Float32Array(scale));
+
     const renderPassDescriptor: GPURenderPassDescriptor = {
       colorAttachments: [
         {
@@ -64,13 +98,13 @@ export class CopyPipeline {
     const passEncoder = commandEncoder.beginRenderPass(renderPassDescriptor);
     passEncoder.setPipeline(this.pipeline);
     passEncoder.setBindGroup(0, this.bindGroup);
-    passEncoder.setVertexBuffer(0, this.quadVertexBuffer);
+    passEncoder.setVertexBuffer(0, this.vertexBuffer);
     passEncoder.draw(4, 1);
     passEncoder.end();
   }
 
   public destroy() {
-    this.quadVertexBuffer.destroy();
+    this.vertexBuffer.destroy();
   }
 
   private ensureBindGroupExists(trailMapIn: GPUTextureView) {
@@ -80,13 +114,19 @@ export class CopyPipeline {
         entries: [
           {
             binding: 0,
+            resource: {
+              buffer: this.uniforms,
+            },
+          },
+          {
+            binding: 1,
             resource: this.device.createSampler({
               magFilter: 'linear',
               minFilter: 'linear',
             }),
           },
           {
-            binding: 1,
+            binding: 2,
             resource: trailMapIn,
           },
         ],
@@ -101,13 +141,20 @@ export class CopyPipeline {
       entries: [
         {
           binding: 0,
+          visibility: GPUShaderStage.VERTEX,
+          buffer: {
+            type: 'uniform',
+          },
+        },
+        {
+          binding: 1,
           visibility: GPUShaderStage.FRAGMENT,
           sampler: {
             type: 'filtering',
           },
         },
         {
-          binding: 1,
+          binding: 2,
           visibility: GPUShaderStage.FRAGMENT,
           texture: {
             sampleType: 'float',

src/pipelines/copy/copy.wgsl

@@ -0,0 +1,19 @@
+struct VertexOutput {
+  @builtin(position) position: vec4<f32>,
+  @location(0) uv: vec2<f32>,
+}
+
+@vertex
+fn vertex(@location(0) uv: vec2<f32>) -> VertexOutput {
+  let ndc = uv * sourceScaler * vec2(2) - vec2(1);
+  return VertexOutput(vec4(ndc.x, -ndc.y, 0, 1), uv);
+}
+
+@group(0) @binding(0) var<uniform> sourceScaler: vec2<f32>;
+@group(0) @binding(1) var Sampler: sampler;
+@group(0) @binding(2) var original: texture_2d<f32>;
+
+@fragment
+fn fragment(@location(0) uv: vec2<f32>) -> @location(0) vec4<f32> {
+  return textureSample(original, Sampler, uv);
+}

src/pipelines/diffusion/diffuse.wgsl

@@ -40,9 +40,9 @@ fn fragment(@location(0) uv: vec2<f32>) -> @location(0) vec4<f32> {
     current += change / 4;
 
   let decayed = vec4(
-    current.rgb,
-    current.a
-  ) - vec4(vec3(settings.decayRateTrails), settings.decayRateBrush) * state.deltaTime;
+    current.rgb * settings.decayRateTrails,
+    current.a * settings.decayRateBrush
+  );
  
   return clamp(decayed, vec4(0), vec4(1));
 }

src/pipelines/diffusion/diffusion-pipeline.ts

@@ -10,7 +10,7 @@ export class DiffusionPipeline {
   private readonly bindGroupLayout: GPUBindGroupLayout;
   private readonly pipeline: GPURenderPipeline;
   private readonly uniforms: GPUBuffer;
-  private readonly quadVertexBuffer: GPUBuffer;
+  private readonly vertexBuffer: GPUBuffer;
   private readonly noise: GPUTextureView;
 
   private bindGroup?: GPUBindGroup;
@@ -25,7 +25,7 @@ export class DiffusionPipeline {
     );
 
     const { buffer, vertex } = setUpFullScreenQuad(device);
-    this.quadVertexBuffer = buffer;
+    this.vertexBuffer = buffer;
 
     this.pipeline = device.createRenderPipeline({
       layout: device.createPipelineLayout({
@@ -90,7 +90,7 @@ export class DiffusionPipeline {
 
     const passEncoder = commandEncoder.beginRenderPass(renderPassDescriptor);
     passEncoder.setPipeline(this.pipeline);
-    passEncoder.setVertexBuffer(0, this.quadVertexBuffer);
+    passEncoder.setVertexBuffer(0, this.vertexBuffer);
     this.commonState.execute(passEncoder);
     passEncoder.setBindGroup(1, this.bindGroup);
     passEncoder.draw(4, 1);
@@ -127,7 +127,7 @@ export class DiffusionPipeline {
   }
 
   public destroy() {
-    this.quadVertexBuffer.destroy();
+    this.vertexBuffer.destroy();
     this.uniforms.destroy();
   }
 

src/pipelines/render/render-pipeline.ts

@@ -11,7 +11,7 @@ export class RenderPipeline {
   private readonly bindGroupLayout: GPUBindGroupLayout;
   private readonly pipeline: GPURenderPipeline;
   private readonly uniforms: GPUBuffer;
-  private readonly quadVertexBuffer: GPUBuffer;
+  private readonly vertexBuffer: GPUBuffer;
 
   private bindGroup?: GPUBindGroup;
   private previousColorTexture?: GPUTextureView;
@@ -24,7 +24,7 @@ export class RenderPipeline {
     this.bindGroupLayout = device.createBindGroupLayout(RenderPipeline.bindGroupLayout);
 
     const { buffer, vertex } = setUpFullScreenQuad(device);
-    this.quadVertexBuffer = buffer;
+    this.vertexBuffer = buffer;
 
     this.pipeline = device.createRenderPipeline({
       layout: device.createPipelineLayout({
@@ -82,7 +82,7 @@ export class RenderPipeline {
     const passEncoder = commandEncoder.beginRenderPass(renderPassDescriptor);
     passEncoder.setPipeline(this.pipeline);
     this.commonState.execute(passEncoder);
-    passEncoder.setVertexBuffer(0, this.quadVertexBuffer);
+    passEncoder.setVertexBuffer(0, this.vertexBuffer);
     passEncoder.setBindGroup(1, this.bindGroup);
     passEncoder.draw(4, 1);
     passEncoder.end();
@@ -118,7 +118,7 @@ export class RenderPipeline {
   }
 
   public destroy() {
-    this.quadVertexBuffer.destroy();
+    this.vertexBuffer.destroy();
     this.uniforms.destroy();
   }
 

src/pipelines/render/render.wgsl

@@ -18,13 +18,13 @@ fn fragment(@location(0) uv: vec2<f32>) -> @location(0) vec4<f32> {
   let brushStrength = traces.a;
 
   let rgbColor = sqrt(vec3(
-    settings.speciesColorA * speciesAStrength +
-    settings.speciesColorB * speciesBStrength +
+    settings.speciesColorA * clamp(speciesAStrength, 0, 1) +
+    settings.speciesColorB * clamp(speciesBStrength, 0, 1) +
     settings.brushColor * brushStrength
   ));
 
 
-  let bg = vec3(0.9) + 0.05 * (random.r - 0.5);
+  let bg = vec3(0.9) + 0.075 * random.r;
   
   
   return vec4(bg - rgbColor, 1);

src/settings.ts

@@ -19,7 +19,7 @@ export const settings: GameLoopSettings &
   BrushSettings &
   DiffusionSettings &
   RenderSettings = {
-  agentCount: 500,
+  agentCount: 1_000_000,
   startingRadius: 0.15,
 
   renderSpeed: 1,
@@ -29,15 +29,15 @@ export const settings: GameLoopSettings &
   brushWidthRandomness: 8,
 
   brushTrailWeight: 5,
-  moveSpeed: 0.025,
-  turnSpeed: 6,
-  sensorAngleDegrees: 30,
-  sensorOffsetDst: 0.025,
+  moveSpeed: 80,
+  turnSpeed: 10,
+  sensorOffsetAngle: 30,
+  sensorOffsetDistance: 60,
 
   diffusionRateTrails: 4,
-  decayRateTrails: 1.5,
+  decayRateTrails: 0.9,
   diffusionRateBrush: 4,
-  decayRateBrush: 0.15,
+  decayRateBrush: 0.98,
 
   brushColor: palette.blue,
   speciesColorA: palette.yellow,

src/utils/delta-time-calculator.ts

@@ -14,6 +14,7 @@ export class DeltaTimeCalculator {
 
     const delta = currentTime - this.previousTime;
     this.previousTime = currentTime;
+    return 1 / 60;
     return Math.min(delta / 1000, this.maxDeltaTimeInSeconds);
   }
 

src/utils/graphics/fbm-noise/fbm-noise.ts

@@ -36,7 +36,7 @@ export const generateFbmNoise = ({
   const cacheKey = `${width}x${height}x${JSON.stringify(constants)}`;
   if (!textureCache.has(cacheKey)) {
     const { buffer, vertex } = setUpFullScreenQuad(device);
-    const quadVertexBuffer = buffer;
+    const vertexBuffer = buffer;
 
     const pipeline = device.createRenderPipeline({
       layout: 'auto',
@@ -81,7 +81,7 @@ export const generateFbmNoise = ({
 
     const passEncoder = commandEncoder.beginRenderPass(renderPassDescriptor);
     passEncoder.setPipeline(pipeline);
-    passEncoder.setVertexBuffer(0, quadVertexBuffer);
+    passEncoder.setVertexBuffer(0, vertexBuffer);
     passEncoder.draw(4, 1);
     passEncoder.end();
 

src/utils/graphics/full-screen-quad/full-screen-quad.ts

@@ -8,7 +8,7 @@ export const setUpFullScreenQuad = (
   vertex: GPUVertexState;
 } => {
   const buffer = device.createBuffer({
-    size: 4 * 4 * 4, // 4x vec4<f32>
+    size: 4 * 4 * Float32Array.BYTES_PER_ELEMENT, // 4 x vec4<f32>
     usage: GPUBufferUsage.VERTEX,
     mappedAtCreation: true,
   });
@@ -30,7 +30,7 @@ export const setUpFullScreenQuad = (
       entryPoint: 'vertex',
       buffers: [
         {
-          arrayStride: 4 * 4,
+          arrayStride: 4 * Float32Array.BYTES_PER_ELEMENT,
           stepMode: 'vertex',
           attributes: [
             {

src/utils/graphics/noise/noise.ts

@@ -16,7 +16,7 @@ export const generateNoise = ({
   const cacheKey = `${width}x${height}`;
   if (!textureCache.has(cacheKey)) {
     const { buffer, vertex } = setUpFullScreenQuad(device);
-    const quadVertexBuffer = buffer;
+    const vertexBuffer = buffer;
 
     const pipeline = device.createRenderPipeline({
       layout: 'auto',
@@ -73,7 +73,7 @@ export const generateNoise = ({
 
     const passEncoder = commandEncoder.beginRenderPass(renderPassDescriptor);
     passEncoder.setPipeline(pipeline);
-    passEncoder.setVertexBuffer(0, quadVertexBuffer);
+    passEncoder.setVertexBuffer(0, vertexBuffer);
     passEncoder.draw(4, 1);
     passEncoder.end();
 

src/utils/graphics/resizable-texture.ts

@@ -0,0 +1,63 @@
+import { CopyPipeline } from '../../pipelines/copy/copy-pipeline';
+
+import { vec2 } from 'gl-matrix';
+
+export class ResizableTexture {
+  private texture: GPUTexture;
+  private textureView: GPUTextureView;
+  private readonly copyPipeline: CopyPipeline;
+  private size: vec2 | null = null;
+
+  public constructor(private readonly device: GPUDevice, size: vec2) {
+    this.copyPipeline = new CopyPipeline(this.device);
+    this.resize(size);
+  }
+
+  public resize(size: vec2): void {
+    if (this.size !== null && vec2.equals(this.size, size)) {
+      return;
+    }
+
+    const newTexture = this.device.createTexture({
+      format: 'rgba16float',
+      dimension: '2d',
+      mipLevelCount: 1,
+      size: {
+        width: size.x,
+        height: size.y,
+        depthOrArrayLayers: 1,
+      },
+      usage:
+        GPUTextureUsage.STORAGE_BINDING |
+        GPUTextureUsage.TEXTURE_BINDING |
+        GPUTextureUsage.RENDER_ATTACHMENT,
+    });
+
+    const newTextureView = newTexture.createView();
+
+    if (this.textureView) {
+      const commandEncoder = this.device.createCommandEncoder();
+      this.copyPipeline.execute(
+        commandEncoder,
+        this.textureView,
+        newTextureView,
+        vec2.div(vec2.create(), this.size, size)
+      );
+      this.device.queue.submit([commandEncoder.finish()]);
+      this.texture.destroy();
+    }
+
+    this.size = size;
+    this.texture = newTexture;
+    this.textureView = newTextureView;
+  }
+
+  public getTextureView(): GPUTextureView {
+    return this.textureView;
+  }
+
+  public destroy(): void {
+    this.texture.destroy();
+    this.copyPipeline.destroy();
+  }
+}