From b1a6430eb720e3c9f276787e8db4f761d55f24f4 Mon Sep 17 00:00:00 2001
From: En Yi <en.yi@tutanota.com>
Date: Tue, 23 May 2023 21:33:05 +0800
Subject: [PATCH] Add horizontal flip to sprites

---
 assets_test.c          | 4 ++--
 scenes/editor_scene.c  | 4 ++--
 scenes/engine/EC/EC.h  | 4 ++--
 scenes/engine/assets.c | 4 ++--
 scenes/engine/assets.h | 2 +-
 scenes/player_ent.c    | 3 +++
 6 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/assets_test.c b/assets_test.c
index 5a2480d..9b67f89 100644
--- a/assets_test.c
+++ b/assets_test.c
@@ -43,8 +43,8 @@ int main(void)
             DrawTextEx(*fnt, "Press C to play a sound", (Vector2){64, 64}, 24, 1, RED);
 
             // Draw the static Sprite and animated Sprite
-            draw_sprite(spr, (Vector2){64,128});
-            draw_sprite(spr2, (Vector2){64,180});
+            draw_sprite(spr, (Vector2){64,128}, false);
+            draw_sprite(spr2, (Vector2){64,180}, true);
         EndDrawing();
 
         // Update the animated Sprite
diff --git a/scenes/editor_scene.c b/scenes/editor_scene.c
index d57090a..2b276a3 100644
--- a/scenes/editor_scene.c
+++ b/scenes/editor_scene.c
@@ -53,7 +53,7 @@ static void level_scene_render_func(Scene_t* scene)
 
             if (data->tile_sprites[tilemap.tiles[i].tile_type] != NULL)
             {
-                draw_sprite(data->tile_sprites[tilemap.tiles[i].tile_type], (Vector2){x,y});
+                draw_sprite(data->tile_sprites[tilemap.tiles[i].tile_type], (Vector2){x,y}, false);
             }
             else if (tilemap.tiles[i].tile_type == SOLID_TILE)
             {
@@ -126,7 +126,7 @@ static void level_scene_render_func(Scene_t* scene)
                 if (spr.sprite != NULL)
                 {
                     Vector2 pos = Vector2Add(p_ct->position, spr.offset);
-                    draw_sprite(spr.sprite, pos);
+                    draw_sprite(spr.sprite, pos, p_cspr->flip_x);
                 }
             }
         }
diff --git a/scenes/engine/EC/EC.h b/scenes/engine/EC/EC.h
index a43ea03..d35299b 100644
--- a/scenes/engine/EC/EC.h
+++ b/scenes/engine/EC/EC.h
@@ -124,14 +124,14 @@ typedef struct _SpriteRenderInfo
 {
     Sprite_t* sprite;
     Vector2 offset;
-    bool flip_x;
-    bool flip_y;
 } SpriteRenderInfo_t;
 
 typedef struct _CSprite_t {
     SpriteRenderInfo_t* sprites;
     sprite_transition_func_t transition_func;
     unsigned int current_idx;
+    bool flip_x;
+    bool flip_y;
 } CSprite_t;
 
 static inline void set_bbox(CBBox_t* p_bbox, unsigned int x, unsigned int y)
diff --git a/scenes/engine/assets.c b/scenes/engine/assets.c
index 1aca17c..8441fc0 100644
--- a/scenes/engine/assets.c
+++ b/scenes/engine/assets.c
@@ -151,12 +151,12 @@ Font* get_font(Assets_t* assets, const char* name)
     return NULL;
 }
 
-void draw_sprite(Sprite_t* spr, Vector2 pos)
+void draw_sprite(Sprite_t* spr, Vector2 pos, bool flip_x)
 {
     Rectangle rec = {
         spr->origin.x + spr->frame_size.x * spr->current_frame,
         spr->origin.y,
-        spr->frame_size.x,
+        spr->frame_size.x * (flip_x ? -1:1),
         spr->frame_size.y
     };
     DrawTextureRec(*spr->texture, rec, pos, WHITE);
diff --git a/scenes/engine/assets.h b/scenes/engine/assets.h
index 031732f..278b628 100644
--- a/scenes/engine/assets.h
+++ b/scenes/engine/assets.h
@@ -28,5 +28,5 @@ Sprite_t* get_sprite(Assets_t* assets, const char* name);
 Sound* get_sound(Assets_t* assets, const char* name);
 Font* get_font(Assets_t* assets, const char* name);
 
-void draw_sprite(Sprite_t* spr, Vector2 pos);
+void draw_sprite(Sprite_t* spr, Vector2 pos, bool flip_x);
 #endif // __ASSETS_H
diff --git a/scenes/player_ent.c b/scenes/player_ent.c
index 043b943..5272075 100644
--- a/scenes/player_ent.c
+++ b/scenes/player_ent.c
@@ -16,6 +16,9 @@ static SpriteRenderInfo_t player_sprite_map[N_PLAYER_SPRITES] = {0};
 static unsigned int player_sprite_transition_func(Entity_t* ent)
 {
     CTransform_t* p_ctrans = get_component(ent, CTRANSFORM_COMP_T);
+    CSprite_t* p_spr = get_component(ent, CSPRITE_T);
+    if (p_ctrans->velocity.x > 0) p_spr->flip_x = true;
+    else if (p_ctrans->velocity.x < 0) p_spr->flip_x = false;
     if (Vector2LengthSqr(p_ctrans->velocity) > 10000.0f)
     {
         return SPR_PLAYER_RUN;