Support flipping actors horizontally

draw_coll_map.py

@@ -0,0 +1,11 @@
+import sys
+
+c = 0
+with open(sys.argv[1], "rb") as f:
+    while True:
+        b = f.read(1)
+        if len(b) == 0:
+            break
+        ws = " " if c < 31 else "\n"
+        c = (c + 1) % 32
+        print(f"{b[0]:02}{ws}", end="")

src/actor.c

@@ -29,6 +29,7 @@ void actor_init(void) {
     actor_reset();
 
     PLAYER_ACTOR->active = 1;
+    PLAYER_ACTOR->flip = 0;
     PLAYER_ACTOR->anim = ANIM_STAND;
     PLAYER_ACTOR->frame_idx = 0;
     PLAYER_ACTOR->frame_counter = 0;
@@ -60,6 +61,7 @@ actor_t *actor_create_mob(uint8_t id) {
 
         a = &all_actors[i];
         a->active = 1;
+        a->flip = 0;
         a->mob_anim_idx = mob_anim_idx;
         a->anim = ANIM_STAND;
         a->frame_idx = 0;
@@ -99,26 +101,26 @@ void actor_update(void) {
 
         oam_ptr->y = a->y + 16;
         oam_ptr->x = a->x + 8;
-        oam_ptr->tile = *anim_ptr++ + TILE_INDEX_PLAYER;
-        oam_ptr->attr = 0;
+        oam_ptr->tile = anim_ptr[a->flip] + TILE_INDEX_PLAYER;
+        oam_ptr->attr = a->flip ? (1 << 5) : 0;
         oam_ptr++;
 
         oam_ptr->y = a->y + 16;
         oam_ptr->x = a->x + TILE_WIDTH + 8;
-        oam_ptr->tile = *anim_ptr++ + TILE_INDEX_PLAYER;
-        oam_ptr->attr = 0;
+        oam_ptr->tile = anim_ptr[1 - a->flip] + TILE_INDEX_PLAYER;
+        oam_ptr->attr = a->flip ? (1 << 5) : 0;
         oam_ptr++;
 
         oam_ptr->y = a->y + TILE_WIDTH + 16;
         oam_ptr->x = a->x + 8;
-        oam_ptr->tile = *anim_ptr++ + TILE_INDEX_PLAYER;
-        oam_ptr->attr = 0;
+        oam_ptr->tile = anim_ptr[a->flip + 2] + TILE_INDEX_PLAYER;
+        oam_ptr->attr = a->flip ? (1 << 5) : 0;
         oam_ptr++;
 
         oam_ptr->y = a->y + TILE_WIDTH + 16;
         oam_ptr->x = a->x + TILE_WIDTH + 8;
-        oam_ptr->tile = *anim_ptr++ + TILE_INDEX_PLAYER;
-        oam_ptr->attr = 0;
+        oam_ptr->tile = anim_ptr[1 - a->flip + 2] + TILE_INDEX_PLAYER;
+        oam_ptr->attr = a->flip ? (1 << 5) : 0;
         oam_ptr++;
 
         a++;

src/actor.h

@@ -22,6 +22,7 @@ typedef enum {
 
 typedef struct {
     uint8_t active;
+    uint8_t flip;
     uint8_t mob_anim_idx;
     actor_anim_state_t anim;
     uint8_t frame_idx;

src/player.c

@@ -79,6 +79,7 @@ void player_update(void) {
         PLAYER.vy = PLAYER_INIT_FALL_VY;
     }
 
+    PLAYER_ACTOR->flip = PLAYER.dir == DIR_LEFT;
     PLAYER_ACTOR->x = PLAYER.x;
     PLAYER_ACTOR->y = PLAYER.y_hi;
 }