Fry3DX 0.4: an easy 3D modeller

Shapes with live settings, shape editing, knife and hole tools, drawing
shapes onto other objects, combining objects (add / subtract / overlap),
copies, thickness, painting with stickers and layers, a Layout tab, a
Print tab with checks, packed .fry files with autosave, export to GLB,
glTF, FBX, OBJ, 3MF, STL and PLY, folders in Layers, its own crash
screen, and a website for GitHub Pages in docs/.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NMSrd5oe1GpUD7E6d825KP

engine/shaders/ssao_blur.frag

@@ -0,0 +1,34 @@
+#version 460
+// Smooths the occlusion (4×4, weighted by how close each sample's depth is to this pixel's).
+#define KEEL_POST // screen-space: render targets, sampled clamped
+#include "backend.glsl"
+PUSH_BLOCK {
+    uint ao, depth;
+    uint w, h;       // depth size
+    uint outW, outH; // this target's (= the occlusion's)
+    float pad0, pad1;
+    vec4 proj;
+} pc;
+layout(location = 0) out vec4 o_ao;
+
+float linearDepth(vec2 uv) {
+    ivec2 p = clamp(ivec2(uv * vec2(pc.w, pc.h)), ivec2(0), ivec2(pc.w - 1, pc.h - 1));
+    float d = fetchTex(pc.depth, p).r;
+    return pc.proj.z * pc.proj.w / (pc.proj.w - d * (pc.proj.w - pc.proj.z));
+}
+
+void main() {
+    ivec2 o = ivec2(gl_FragCoord.xy);
+    vec2 uv = gl_FragCoord.xy / vec2(pc.outW, pc.outH);
+    float z = linearDepth(uv);
+    float sum = 0.0, weight = 0.0;
+    for (int y = -2; y < 2; ++y)
+        for (int x = -2; x < 2; ++x) {
+            ivec2 q = clamp(o + ivec2(x, y), ivec2(0), ivec2(pc.outW - 1, pc.outH - 1));
+            float zq = linearDepth((vec2(q) + 0.5) / vec2(pc.outW, pc.outH));
+            float wgt = max(0.0, 1.0 - abs(zq - z) / (0.05 * z + 1.0));
+            sum += fetchTex(pc.ao, q).r * wgt;
+            weight += wgt;
+        }
+    o_ao = vec4(weight > 0.0 ? sum / weight : 1.0);
+}