refactor: Enhance bezel shading and depth effects for improved visual realism

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

packages/wolf_3d_renderer/shaders/wolf_world.frag

@@ -32,16 +32,32 @@ void main() {
     // Fill outside warped bounds with a darker consumer-TV charcoal bezel.
     if (uv.x < 0.0 || uv.x > 1.0 || uv.y < 0.0 || uv.y > 1.0) {
       vec2 clampedUv = clamp(uv, 0.0, 1.0);
-      vec2 edgeDelta = abs(uv - clampedUv);
-      float overflow = max(edgeDelta.x, edgeDelta.y);
+      vec2 edgeDelta = uv - clampedUv;
+      float overflow = max(abs(edgeDelta.x), abs(edgeDelta.y));
 
-      float verticalShade = 0.90 + 0.08 * (1.0 - (FlutterFragCoord().y / uResolution.y));
-      float depthShade = 1.0 - smoothstep(0.0, 0.06, overflow) * 0.24;
-      float grain = sin(FlutterFragCoord().x * 0.21 + FlutterFragCoord().y * 0.11) * 0.007;
-      float moldedHighlight = smoothstep(0.08, 0.0, overflow) * 0.045;
+      // Approximate concave bezel depth by measuring how far this fragment is
+      // from the emissive screen boundary in aspect-corrected UV space.
+      vec2 aspectScale = vec2(uResolution.x / max(uResolution.y, 1.0), 1.0);
+      float bezelDistance = length(edgeDelta * aspectScale);
+
+      // Corners receive less direct bleed because the nearest lit area is
+      // diagonally offset, so attenuate glow toward corner regions.
+      vec2 clampedCentered = clampedUv * 2.0 - 1.0;
+      float cornerFactor = smoothstep(0.60, 1.15, length(clampedCentered));
+
+        float verticalShade = 0.88 + 0.07 * (1.0 - (FlutterFragCoord().y / uResolution.y));
+        float depthShade = 1.0 - smoothstep(0.0, 0.058, overflow) * 0.34;
+        float grain = sin(FlutterFragCoord().x * 0.21 + FlutterFragCoord().y * 0.11) * 0.006;
+        float moldedHighlight = smoothstep(0.072, 0.0, overflow) * 0.028;
+
+        // Deeper arcade-style profile: tighter glow and steeper rolloff to shadow.
+        float bezelGlow = exp(-bezelDistance * 82.0) * mix(1.0, 0.56, cornerFactor);
+        float innerLip = exp(-bezelDistance * 170.0) * 0.14;
 
       vec3 bezelColor =
-          vec3(0.26, 0.26, 0.25) * verticalShade * depthShade +
+          vec3(0.225, 0.225, 0.215) * verticalShade * depthShade +
+          vec3(0.062, 0.072, 0.062) * bezelGlow +
+          vec3(innerLip) +
           vec3(moldedHighlight) +
           vec3(grain);
       fragColor = vec4(bezelColor, 1.0);