Seasons: snow above ground in winter, glowing pumpkins at Halloween

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/main.rs

@@ -1893,6 +1893,17 @@ app.pending_briefing = briefing_of(&campaign, i);
             }
         }
         app.game.smooth_display(dt);
+        // winter: snow falls on the land above ground near the camera
+        if render3d::season() == 2 && !app.game.map.sky.is_empty() && app.game.parts.len() < 3000 {
+            let (cx, cz) = (app.cam.tx, app.cam.tz);
+            for _ in 0..3 {
+                let x = cx + (rand::gen_range(-1.0f32, 1.0)) * app.cam.zoom * 0.8;
+                let z = cz + (rand::gen_range(-1.0f32, 1.0)) * app.cam.zoom * 0.8;
+                if inb(x as i32, z as i32) && app.game.map.sky(map::idx(x as i32, z as i32)) {
+                    app.game.parts.push(particles::Part { kind: particles::EMBER, x, y: z, h: 4.0, vx: rand::gen_range(-0.2f32, 0.2), vy: 0.0, vh: -0.6, t: 0.0, max: 6.0, col: particles::abgr(245, 248, 255), size: 0.04 });
+                }
+            }
+        }
         let hear = app.cam.zoom * 1.2;
         let (right, _) = app.cam.ground_axes();
         for ev in app.game.events.drain(..) {