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/taa.frag

@@ -0,0 +1,69 @@
+#version 460
+// Temporal anti-aliasing (as id Tech 6's TSSAA, in spirit): the scene is drawn a sub-pixel off
+// each frame; each pixel finds where it was last frame (its depth, last frame's camera) and
+// blends with what was there, after clamping that to the colours around it now (variance
+// clipping in YCoCg) so moved things don't leave ghosts. Weighted by brightness so highlights
+// don't flicker. Rows are the targets' own (uv from gl_FragCoord), on both backends.
+#define KEEL_POST // screen-space: render targets, sampled clamped
+#include "backend.glsl"
+#include "upsample.glsl"
+PUSH_BLOCK {
+    mat4 reproject;  // this frame's clip space → last frame's
+    uint scene, history, depth;
+    uint w, h;
+    uint reset;      // no usable history (first frame, resized, teleported)
+    uint ssr;        // reflections to add first (half size), 0 = none
+    float pad1;
+} pc;
+layout(location = 0) out vec4 o_color;
+
+// The scene with the half-size reflections / volumetric light on it: depth-aware for the pixel
+// itself (no lines along edges), a plain read for its neighbours (only the colour clamp uses them).
+vec3 sceneAt(ivec2 q) {
+    vec3 c = fetchTex(pc.scene, q).rgb;
+    if (pc.ssr != 0u) c += sampleTexLod(pc.ssr, (vec2(q) + 0.5) / vec2(pc.w, pc.h), 0.0).rgb;
+    return c;
+}
+vec3 sceneAtCentre(ivec2 q) {
+    vec3 c = fetchTex(pc.scene, q).rgb;
+    if (pc.ssr != 0u) c += upsampleDepthAware(pc.ssr, pc.depth, q).rgb;
+    return c;
+}
+
+vec3 toYCoCg(vec3 c) { return vec3(dot(c, vec3(0.25, 0.5, 0.25)), dot(c, vec3(0.5, 0.0, -0.5)), dot(c, vec3(-0.25, 0.5, -0.25))); }
+vec3 fromYCoCg(vec3 c) { return vec3(c.x + c.y - c.z, c.x + c.z, c.x - c.y - c.z); }
+float weight(vec3 c) { return 1.0 / (1.0 + dot(c, vec3(0.2126, 0.7152, 0.0722))); }
+
+void main() {
+    ivec2 p = ivec2(gl_FragCoord.xy);
+    ivec2 last = ivec2(pc.w - 1, pc.h - 1);
+    vec3 cur = sceneAtCentre(p).rgb;
+    if (pc.reset != 0u) { o_color = vec4(cur, 1.0); return; }
+    // The colours around this pixel now (mean ± deviation), and the nearest depth among them
+    // (so an edge's history comes from the thing in front).
+    vec3 m1 = vec3(0.0), m2 = vec3(0.0);
+    float nearest = 1.0;
+    ivec2 at = p;
+    for (int y = -1; y <= 1; ++y)
+        for (int x = -1; x <= 1; ++x) {
+            ivec2 q = clamp(p + ivec2(x, y), ivec2(0), last);
+            vec3 c = toYCoCg(sceneAt(q).rgb);
+            m1 += c;
+            m2 += c * c;
+            float d = fetchTex(pc.depth, q).r;
+            if (d < nearest) nearest = d, at = q;
+        }
+    vec3 mu = m1 / 9.0, sigma = sqrt(abs(m2 / 9.0 - mu * mu));
+    vec3 lo = mu - 1.25 * sigma, hi = mu + 1.25 * sigma;
+    vec2 uv = (vec2(p) + 0.5) / vec2(pc.w, pc.h);
+    vec4 prev = pc.reproject * vec4(((vec2(at) + 0.5) / vec2(pc.w, pc.h)) * 2.0 - 1.0, nearest, 1.0);
+    vec2 puv = prev.xy / prev.w * 0.5 + 0.5 + (uv - (vec2(at) + 0.5) / vec2(pc.w, pc.h));
+    if (any(lessThan(puv, vec2(0.0))) || any(greaterThan(puv, vec2(1.0)))) { o_color = vec4(cur, 1.0); return; }
+    vec3 hist = sampleTex(pc.history, puv).rgb;
+    hist = fromYCoCg(clamp(toYCoCg(hist), lo, hi));
+    // Less history when things move a lot on screen (it smears), more when still.
+    float moved = length((puv - uv) * vec2(pc.w, pc.h));
+    float keep = mix(0.92, 0.7, clamp(moved / 24.0, 0.0, 1.0));
+    float wc = (1.0 - keep) * weight(cur), wh = keep * weight(hist);
+    o_color = vec4((cur * wc + hist * wh) / (wc + wh), 1.0);
+}