From fc2001e428041919753d34cf7ce469937c28e838 Mon Sep 17 00:00:00 2001
From: En Yi <en.yi@tutanota.com>
Date: Sat, 17 Jun 2023 11:50:23 +0800
Subject: [PATCH] Add system to destroy one-way tile with boulder

---
 scenes/editor_scene.c |  1 +
 scenes/game_systems.c | 37 +++++++++++++++++++++++++++++++++++++
 scenes/game_systems.h |  1 +
 3 files changed, 39 insertions(+)

diff --git a/scenes/editor_scene.c b/scenes/editor_scene.c
index cabb96b..152720f 100644
--- a/scenes/editor_scene.c
+++ b/scenes/editor_scene.c
@@ -425,6 +425,7 @@ void init_level_scene(LevelScene_t* scene)
 
     sc_array_add(&scene->scene.systems, &moveable_update_system);
     sc_array_add(&scene->scene.systems, &movement_update_system);
+    sc_array_add(&scene->scene.systems, &boulder_destroy_wooden_tile_system);
     sc_array_add(&scene->scene.systems, &update_tilemap_system);
     sc_array_add(&scene->scene.systems, &tile_collision_system);
     sc_array_add(&scene->scene.systems, &update_tilemap_system);
diff --git a/scenes/game_systems.c b/scenes/game_systems.c
index 993d71e..60ffbb0 100644
--- a/scenes/game_systems.c
+++ b/scenes/game_systems.c
@@ -1437,6 +1437,43 @@ void hitbox_update_system(Scene_t* scene)
     }
 }
 
+void boulder_destroy_wooden_tile_system(Scene_t* scene)
+{
+    LevelSceneData_t* data = &(CONTAINER_OF(scene, LevelScene_t, scene)->data);
+    TileGrid_t tilemap = data->tilemap;
+    Entity_t* p_boulder;
+    sc_map_foreach_value(&scene->ent_manager.entities_map[BOULDER_ENT_TAG], p_boulder)
+    {
+        const CTransform_t* p_ctransform = get_component(p_boulder, CTRANSFORM_COMP_T);
+        const CBBox_t* p_bbox = get_component(p_boulder, CBBOX_COMP_T);
+
+        if (p_ctransform->velocity.y <= 0) continue;
+
+        unsigned int tile_idx = get_tile_idx(
+                p_ctransform->position.x + p_bbox->half_size.x,
+                p_ctransform->position.y + p_bbox->size.y,
+                tilemap.width
+        );
+        unsigned int tile_x = (p_ctransform->position.x + p_bbox->half_size.x) / TILE_SIZE;
+
+        if (tilemap.tiles[tile_idx].tile_type == ONEWAY_TILE)
+        {
+            tilemap.tiles[tile_idx].tile_type = EMPTY_TILE;
+            tilemap.tiles[tile_idx].solid = NOT_SOLID;
+            if (tile_x > 0 && tilemap.tiles[tile_idx - 1].tile_type == ONEWAY_TILE)
+            {
+                tilemap.tiles[tile_idx - 1].tile_type = EMPTY_TILE;
+                tilemap.tiles[tile_idx - 1].solid = NOT_SOLID;
+            }
+            if (tile_x < tilemap.width && tilemap.tiles[tile_idx + 1].tile_type == ONEWAY_TILE)
+            {
+                tilemap.tiles[tile_idx + 1].tile_type = EMPTY_TILE;
+                tilemap.tiles[tile_idx + 1].solid = NOT_SOLID;
+            }
+        }
+    }
+}
+
 void sprite_animation_system(Scene_t* scene)
 {
     unsigned int ent_idx;
diff --git a/scenes/game_systems.h b/scenes/game_systems.h
index 0e427b4..8e4937f 100644
--- a/scenes/game_systems.h
+++ b/scenes/game_systems.h
@@ -18,6 +18,7 @@ void state_transition_update_system(Scene_t* scene);
 void update_tilemap_system(Scene_t* scene);
 void hitbox_update_system(Scene_t* scene);
 void sprite_animation_system(Scene_t* scene);
+void boulder_destroy_wooden_tile_system(Scene_t* scene);
 void camera_update_system(Scene_t* scene);
 void player_dir_reset_system(Scene_t* scene);
 void player_respawn_system(Scene_t* scene);