Mushroom groves: unclaimable moss where giant mushrooms grow slowly and glow when ready to fell

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

src/render3d.rs

@@ -526,6 +526,10 @@ fn ambient_field(map: &Map) -> Vec<f32> {
         if t.river() == Some(Kind::Lava) {
             f[i] = f[i].max(0.8); // lava lights up its surroundings
         }
+        // the spores of a mushroom grove glow faintly
+        if t.kind == Kind::Grove || (t.kind == Kind::Mushroom && t.res & MUSH_GROVE != 0) {
+            f[i] = f[i].max(0.45);
+        }
         if t.kind == Kind::Core {
             f[i] = 1.0;
         }
@@ -765,6 +769,10 @@ fn build_chunk(map: &Map, amb: &[f32], glow: &[f32], cx: i32, cz: i32, atlas: &T
             if map.sky(idx(x, z)) && t.kind == Kind::Floor && t.owner == Owner::None {
                 tex = if season() == 2 { T_SNOW } else { T_GRASS } + (t.var as u32 & 3);
             }
+            // a grove's mushroom stands on moss
+            if t.kind == Kind::Mushroom && t.res & MUSH_GROVE != 0 {
+                tex = crate::gfx::T_MOSS + (t.var as u32 & 3);
+            }
             let (ua, ub) = cell_uv(tex);
             let (xf, zf) = (x as f32, z as f32);
             if !map.shown(idx(x, z)) {
@@ -976,11 +984,16 @@ fn build_chunk(map: &Map, amb: &[f32], glow: &[f32], cx: i32, cz: i32, atlas: &T
                     let tint = |v: Vec3| col(lava_lit(if t.marked { v * vec3(1.3, 1.15, 0.5) } else { v }, lg), 1.0);
                     let s = 0.85 + 0.1 * (t.var & 3) as f32;
                     if t.kind == Kind::Mushroom {
+                        // it grows from a sprout to full size in steps; grown, its cap glows teal
+                        let stage = mushroom_stage(&t);
+                        let s = s * (0.3 + 0.7 * stage as f32 / 4.0);
                         let h = 0.75 * s;
                         let sc = tint(Vec3::splat(a.max(0.35)));
-                        mb.boxy(vec3(cx - 0.12, 0.0, cz - 0.12), vec3(cx + 0.12, h, cz + 0.12), T_STEM, sc, sc);
-                        // the cap glows a little in the dark
-                        let cc = tint(Vec3::splat(a.max(0.7)));
+                        let w = 0.12 * s.max(0.6);
+                        mb.boxy(vec3(cx - w, 0.0, cz - w), vec3(cx + w, h, cz + w), T_STEM, sc, sc);
+                        // the cap glows a little in the dark; a grown one in its own colour
+                        let hue = if stage >= 4 { vec3(0.55, 1.35, 1.25) } else { vec3(0.95, 0.8, 0.62) };
+                        let cc = tint(Vec3::splat(a.max(0.7)) * hue);
                         mb.boxy(vec3(cx - 0.42 * s, h, cz - 0.42 * s), vec3(cx + 0.42 * s, h + 0.26, cz + 0.42 * s), T_CAP, cc, cc);
                         mb.boxy(vec3(cx - 0.26 * s, h + 0.26, cz - 0.26 * s), vec3(cx + 0.26 * s, h + 0.38, cz + 0.26 * s), T_CAP, cc, cc);
                     } else {
@@ -1202,6 +1215,7 @@ fn chunk_sig(map: &Map, cx: i32, cz: i32) -> u64 {
                         Kind::Farm => t.food as u64,
                         Kind::Treasury => (t.gold / 50) as u64 | (t.res as u64) << 5,
                         Kind::Drawbridge => t.res as u64,
+                        Kind::Mushroom => mushroom_stage(&t) as u64 | (t.res as u64) << 3,
                         _ => 0,
                     };
                     let shown = map.shown(idx(x, z)) as u64 | (map.sky(idx(x, z)) as u64) << 1;
@@ -2449,6 +2463,15 @@ fn draw_landmarks_solid(g: &Game, t: f32) {
     let _ = t;
 }
 
+// growth stage of a giant mushroom: 0 a sprout .. 4 fully grown (felling only then)
+fn mushroom_stage(t: &Tile) -> u32 {
+    if t.grown() {
+        4
+    } else {
+        ((t.growth() * 4.0) as u32).min(3)
+    }
+}
+
 // the colour of a master side (the first master red, rivals green, blue and yellow)
 pub fn master_rgb(side: u8) -> Vec3 {
     match side {
@@ -3337,6 +3360,7 @@ pub fn minimap_color(tile: &Tile) -> [u8; 4] {
         Kind::Drawbridge => [120, 80, 50, 255],
         Kind::Obsidian => [60, 40, 70, 255],
         Kind::Mushroom => [150, 90, 200, 255],
+        Kind::Grove => [50, 110, 92, 255],
         Kind::Tree => [40, 100, 40, 255],
         Kind::Shard => [255, 60, 120, 255],
         Kind::Aerie => [170, 140, 90, 255],