init

assets/shaders/dof_common.glsl

@@ -0,0 +1,12 @@
+uniform vec4 uDof;  // focus distance, focus range, transition, max radius (half-res px)
+uniform float uTiltShift;
+
+// Signed CoC in [-1, 1]. Distance-based blur plus an optional screen-space
+// tilt-shift band that exaggerates the miniature/diorama look.
+float cocFromDepth(float linDepth, vec2 uv) {
+    float s = linDepth - uDof.x;
+    float a = smoothstep(uDof.y, uDof.y + uDof.z, abs(s));
+    float tilt = uTiltShift * smoothstep(0.18, 0.5, abs(uv.y - 0.5));
+    float sgn = abs(s) > 0.25 ? sign(s) : sign(uv.y - 0.5);
+    return max(a, tilt) * sgn;
+}