Move systems into subdirectory, add tree shake animation

game/systems/s_event.c

@@ -0,0 +1,28 @@
+#include "systems.h"
+
+#include "../game_state.h"
+
+i32 harvestEvent(ecs_entity_t entity, HarvestEvent event) {
+    BZ_ASSERT(ecs_has_id(ECS, entity, Harvestable));
+    BZ_ASSERT(ecs_has(ECS, entity, Resource));
+
+    ecs_set(ECS, entity, Easing, {
+        .type = EASE_ROTATION,
+        .easingFunc = BZ_EASE_OUT_ELASTIC,
+        .duration = 0.4f,
+
+        // 45 * (1.0f + (-1.0f) * x)
+        .target = 45,
+        .easeTarget = -1.0f,
+        .easeStart = 1.0f
+    });
+
+    Resource *res = ecs_get_mut(ECS, entity, Resource);
+    event.amount = BZ_MIN(event.amount, res->amount);
+    res->amount -= event.amount;
+
+    if (res->amount <= 0)
+        ecs_delete(ECS, entity);
+
+    return event.amount;
+}