Add simple friction

Changelog:
- Rework tile movement update logic to be general
- Increase tilemap and player size for testing

components.h

@@ -30,7 +30,7 @@ typedef struct _CTransform_t
 // Thus the size of the entity cannot be larger than the tile
 typedef struct _CTileCoord_t
 {
-    unsigned int tiles[4];
+    unsigned int tiles[8];
     unsigned int n_tiles;
 }CTileCoord_t;
 

scene_impl.c

@@ -65,8 +65,7 @@ static void movement_update_system(Scene_t* scene)
     sc_map_foreach_value(&scene->ent_manager.entities_map[PLAYER_ENT_TAG], p_player)
     {
         CTransform_t* p_ctransform = get_component(&scene->ent_manager, p_player, CTRANSFORM_COMP_T);
-        p_ctransform->accel.x = data->player_dir.x * 200 * 1.0 / mag;
-        p_ctransform->accel.y = data->player_dir.y * 200 * 1.0 / mag;
+        p_ctransform->accel = Vector2Scale(Vector2Normalize(data->player_dir), 600);
     }
     data->player_dir.x = 0;
     data->player_dir.y = 0;
@@ -76,9 +75,12 @@ static void movement_update_system(Scene_t* scene)
     CTransform_t * p_ctransform;
     sc_map_foreach_value(&scene->ent_manager.component_map[CTRANSFORM_COMP_T], p_ctransform)
     {
-        p_ctransform->velocity = Vector2Add(
-            p_ctransform->velocity,
-            Vector2Scale(p_ctransform->accel, delta_time)
+        p_ctransform->velocity = Vector2Scale(
+            Vector2Add(
+                p_ctransform->velocity,
+                Vector2Scale(p_ctransform->accel, delta_time)
+            ),
+            0.95
         );
 
         // Store previous position before update
@@ -119,30 +121,19 @@ static void update_tilemap_system(Scene_t *scene)
         p_tilecoord->n_tiles = 0;
 
         // Compute new occupied tile positions and add
-        unsigned int tile_x = (p_ctransform->position.x) / TILE_SIZE;
-        unsigned int tile_y = (p_ctransform->position.y) / TILE_SIZE;
-        p_tilecoord->tiles[0] = tile_y * tilemap.width + tile_x;
-        p_tilecoord->n_tiles++;
+        unsigned int tile_x1 = (p_ctransform->position.x) / TILE_SIZE;
+        unsigned int tile_y1 = (p_ctransform->position.y) / TILE_SIZE;
+        unsigned int tile_x2 = (p_ctransform->position.x + p_bbox->size.x) / TILE_SIZE;
+        unsigned int tile_y2 = (p_ctransform->position.y + p_bbox->size.y) / TILE_SIZE;
 
-        bool check_x = (tile_x + 1) < tilemap.width;
-        bool check_y = (tile_y + 1) < tilemap.height;
-        if (check_x)
+        for (unsigned int tile_y=tile_y1; tile_y <= tile_y2; tile_y++)
         {
-            p_tilecoord->tiles[p_tilecoord->n_tiles++] = p_tilecoord->tiles[0] + 1;
-        }
-        if (check_y)
-        {
-            p_tilecoord->tiles[p_tilecoord->n_tiles++] = p_tilecoord->tiles[0] + tilemap.width;
-        }
-        if (check_x && check_y)
-        {
-            p_tilecoord->tiles[p_tilecoord->n_tiles++] = p_tilecoord->tiles[0] + tilemap.width + 1;
-        }
-
-        for (size_t i=0;i<p_tilecoord->n_tiles;++i)
-        {
-            unsigned int tile_idx = p_tilecoord->tiles[i];
-            sc_map_put_64(&(tilemap.tiles[tile_idx].entities_set), p_ent->m_id, 0);
+            for (unsigned int tile_x=tile_x1; tile_x <= tile_x2; tile_x++)
+            {
+                unsigned int tile_idx = tile_y * tilemap.width + tile_x;
+                p_tilecoord->tiles[p_tilecoord->n_tiles++] = tile_idx;
+                sc_map_put_64(&(tilemap.tiles[tile_idx].entities_set), p_ent->m_id, 0);
+            }
         }
     }
 }
@@ -240,9 +231,10 @@ void init_level_scene(LevelScene_t *scene)
     sc_map_put_64(&scene->scene.action_map, KEY_LEFT, ACTION_LEFT);
     sc_map_put_64(&scene->scene.action_map, KEY_RIGHT, ACTION_RIGHT);
 
-    scene->data.tilemap.width = 16;
+    scene->data.tilemap.width = 32;
     scene->data.tilemap.height = 16;
-    scene->data.tilemap.n_tiles = 16*16;
+    assert(32*16 <= MAX_N_TILES);
+    scene->data.tilemap.n_tiles = 32*16;
     scene->data.tilemap.tiles = all_tiles;
     for (size_t i=0; i<MAX_N_TILES;i++)
     {

scene_test.c

@@ -9,7 +9,7 @@ struct sc_queue_32 key_buffer;
 int main(void)
 {
     sc_queue_init(&key_buffer);
-    InitWindow(640, 640, "raylib");
+    InitWindow(1280, 640, "raylib");
     SetTargetFPS(60);
     init_memory_pools();
     LevelScene_t scene;
@@ -18,7 +18,7 @@ int main(void)
 
     CBBox_t *p_bbox = add_component(&scene.scene.ent_manager, p_ent, CBBOX_COMP_T);
     p_bbox->size.x = 30;
-    p_bbox->size.y = 30;
+    p_bbox->size.y = 45;
     add_component(&scene.scene.ent_manager, p_ent, CTRANSFORM_COMP_T);
     add_component(&scene.scene.ent_manager, p_ent, CTILECOORD_COMP_T);
     update_entity_manager(&scene.scene.ent_manager);