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Fix garbage dopo chiusura hint: usa Window layer invece di BG

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Best practice GBDK: il Window layer ha un tile map separato (0x9C00)
rispetto al BG (0x9800). Usando set_win_tiles + SHOW_WIN per il testo
delle istruzioni, il BG map del gameplay non viene mai toccato.
Alla chiusura basta HIDE_WIN: niente garbage, niente flush differito.

Ripristino tile: set_bkg_data (maze) + set_sprite_data (player/enemy/
stamina/level) + draw_map + update_camera + update_player_sprite.
This commit is contained in:
Matteo Benedetto
2026-06-25 22:31:28 +02:00
parent d75a44c2d1
commit fb22126458
1 changed files with 15 additions and 5 deletions
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src/engine.c
+15 -5
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@@ -233,12 +233,10 @@ void engine_update(uint8_t keys, uint8_t prev_keys) {
if (!hint_displayed) {
hint_displayed = 1;
HIDE_SPRITES;
SCX_REG = 0;
SCY_REG = 0;
font_init();
font_t hint_font = font_load(font_ibm);
font_set(hint_font);
BGP_REG = 0x1B;
BGP_REG = 0x1B; // palette invertita (sfondo nero, testo chiaro)
memset(map_buffer, 0, sizeof(map_buffer));
ending_puttext(3, 2, "A SCREAM FROM");
ending_puttext(6, 3, "THE DARK");
@@ -248,13 +246,25 @@ void engine_update(uint8_t keys, uint8_t prev_keys) {
ending_puttext(2, 10, "B RUN");
ending_puttext(2, 12, "PRESS B START");
ending_puttext(4, 14, "SELECT HELP");
set_bkg_tiles(0, 0, 32, 32, map_buffer);
// Usa il WINDOW layer (tile map separato a 0x9C00) per il testo:
// il BG map del gameplay (0x9800) resta intatto -> niente garbage
// quando si chiude l'hint. move_win(7,0) allinea a sinistra (-7 offset).
set_win_tiles(0, 0, 32, 32, map_buffer);
move_win(7, 0);
SHOW_WIN;
}
// B chiude la schermata e riprende il gioco
if ((keys & J_B) && !(prev_keys & J_B)) {
HIDE_WIN; // nascondi il Window: il BG map del gameplay e' intatto
BGP_REG = 0xE4;
// Ripristina i tile del maze in VRAM (font_load li aveva sovrascritti)
set_bkg_data(0, tiles_TILE_COUNT, tiles_tiles);
draw_map(player_lx, player_ly);
// Ricarica i tile degli sprite (stessa tile RAM condivisa)
set_sprite_data(0, player_TILE_COUNT, player_tiles);
set_sprite_data(player_TILE_COUNT, enemy_TILE_COUNT, enemy_tiles);
set_sprite_data(tiles_TILE_COUNT, stamina_TILE_COUNT * 2, stamina_tiles);
set_sprite_data(LEVEL_SPRITE_BASE, level_TILE_COUNT, level_tiles);
draw_map(player_lx, player_ly); // ridisegna la scena (tile ripristinati)
update_camera();
update_player_sprite();
SHOW_SPRITES;