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5/claude-sonnet #19

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18 changes: 9 additions & 9 deletions src/core/shaders.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -172,22 +172,22 @@ export const displayShader = /* glsl */ `
float obs = texture2D(uObstacle, vUv).r;
// Smooth fade: density falls off over the blurred obstacle boundary zone
// rather than cutting off at a hard step, eliminating the jagged fringe.
float density = max(texture2D(uTexture, vUv).r, 0.0) * (1.0 - obs);
float density = clamp(texture2D(uTexture, vUv).r, 0.0, 1.0) * (1.0 - obs);
float coverage = texture2D(uCoverage, vUv).r;

// 8-tap Sobel normal — computes gradient via 3×3 kernel (no centre sample needed).
// texelSize = 1/displayRes; density FBO is at simScale (0.5×), so s=6 display px
// ≈ 3 sim texels per axis. The Sobel kernel properly averages the gradient in
// every direction — no 4-tap cross bias that creates 45° circuit-board artefacts.
float sx = texelSize.x * 6.0, sy = texelSize.y * 6.0;
float d00 = max(texture2D(uTexture, vUv + vec2(-sx, -sy)).r, 0.0);
float d10 = max(texture2D(uTexture, vUv + vec2(0.0, -sy)).r, 0.0);
float d20 = max(texture2D(uTexture, vUv + vec2( sx, -sy)).r, 0.0);
float d01 = max(texture2D(uTexture, vUv + vec2(-sx, 0.0)).r, 0.0);
float d21 = max(texture2D(uTexture, vUv + vec2( sx, 0.0)).r, 0.0);
float d02 = max(texture2D(uTexture, vUv + vec2(-sx, sy)).r, 0.0);
float d12 = max(texture2D(uTexture, vUv + vec2(0.0, sy)).r, 0.0);
float d22 = max(texture2D(uTexture, vUv + vec2( sx, sy)).r, 0.0);
float d00 = clamp(texture2D(uTexture, vUv + vec2(-sx, -sy)).r, 0.0, 1.0);
float d10 = clamp(texture2D(uTexture, vUv + vec2(0.0, -sy)).r, 0.0, 1.0);
float d20 = clamp(texture2D(uTexture, vUv + vec2( sx, -sy)).r, 0.0, 1.0);
float d01 = clamp(texture2D(uTexture, vUv + vec2(-sx, 0.0)).r, 0.0, 1.0);
float d21 = clamp(texture2D(uTexture, vUv + vec2( sx, 0.0)).r, 0.0, 1.0);
float d02 = clamp(texture2D(uTexture, vUv + vec2(-sx, sy)).r, 0.0, 1.0);
float d12 = clamp(texture2D(uTexture, vUv + vec2(0.0, sy)).r, 0.0, 1.0);
float d22 = clamp(texture2D(uTexture, vUv + vec2( sx, sy)).r, 0.0, 1.0);
float gx = (d20 + 2.0*d21 + d22) - (d00 + 2.0*d01 + d02);
float gy = (d02 + 2.0*d12 + d22) - (d00 + 2.0*d10 + d20);

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18 changes: 9 additions & 9 deletions src/core/wgsl-shaders.ts
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Expand Up @@ -313,19 +313,19 @@ struct U {

@fragment fn fs(i: VSOut) -> @location(0) vec4f {
let obs = textureSample(uObs, samp, i.uv).r;
let density = max(textureSample(uTex, samp, i.uv).r, 0.0) * (1.0 - obs);
let density = clamp(textureSample(uTex, samp, i.uv).r, 0.0, 1.0) * (1.0 - obs);
let cov = textureSample(uCov, samp, i.uv).r;

let sx = u.texelSize.x * 6.0;
let sy = u.texelSize.y * 6.0;
let d00 = max(textureSample(uTex, samp, i.uv + vec2f(-sx, -sy)).r, 0.0);
let d10 = max(textureSample(uTex, samp, i.uv + vec2f(0.0, -sy)).r, 0.0);
let d20 = max(textureSample(uTex, samp, i.uv + vec2f( sx, -sy)).r, 0.0);
let d01 = max(textureSample(uTex, samp, i.uv + vec2f(-sx, 0.0)).r, 0.0);
let d21 = max(textureSample(uTex, samp, i.uv + vec2f( sx, 0.0)).r, 0.0);
let d02 = max(textureSample(uTex, samp, i.uv + vec2f(-sx, sy)).r, 0.0);
let d12 = max(textureSample(uTex, samp, i.uv + vec2f(0.0, sy)).r, 0.0);
let d22 = max(textureSample(uTex, samp, i.uv + vec2f( sx, sy)).r, 0.0);
let d00 = clamp(textureSample(uTex, samp, i.uv + vec2f(-sx, -sy)).r, 0.0, 1.0);
let d10 = clamp(textureSample(uTex, samp, i.uv + vec2f(0.0, -sy)).r, 0.0, 1.0);
let d20 = clamp(textureSample(uTex, samp, i.uv + vec2f( sx, -sy)).r, 0.0, 1.0);
let d01 = clamp(textureSample(uTex, samp, i.uv + vec2f(-sx, 0.0)).r, 0.0, 1.0);
let d21 = clamp(textureSample(uTex, samp, i.uv + vec2f( sx, 0.0)).r, 0.0, 1.0);
let d02 = clamp(textureSample(uTex, samp, i.uv + vec2f(-sx, sy)).r, 0.0, 1.0);
let d12 = clamp(textureSample(uTex, samp, i.uv + vec2f(0.0, sy)).r, 0.0, 1.0);
let d22 = clamp(textureSample(uTex, samp, i.uv + vec2f( sx, sy)).r, 0.0, 1.0);
let gx = (d20 + 2.0*d21 + d22) - (d00 + 2.0*d01 + d02);
let gy = (d02 + 2.0*d12 + d22) - (d00 + 2.0*d10 + d20);

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