diff --git a/Core/display.c b/Core/display.c index b18bd1a..8f12f23 100755 --- a/Core/display.c +++ b/Core/display.c @@ -45,7 +45,22 @@ static uint32_t get_pixel(GB_gameboy_t *gb, uint8_t x, uint8_t y) uint8_t lowest_sprite_x = 0xFF; bool use_obp1 = false, priority = false; bool in_window = false; - if (gb->effective_window_enabled && (gb->io_registers[GB_IO_LCDC] & 0x20)) { /* Window Enabled */ + bool window_enabled = (gb->io_registers[GB_IO_LCDC] & 0x20); + bool bg_enabled = true; + bool bg_behind = false; + if ((gb->io_registers[GB_IO_LCDC] & 0x1) == 0) { + if (gb->cgb_mode) { + bg_behind = true; + } + else if (gb->is_cgb) { /* CGB in DMG mode*/ + bg_enabled = window_enabled = false; + } + else { + /* DMG */ + bg_enabled = false; + } + } + if (gb->effective_window_enabled && window_enabled) { /* Window Enabled */ if (y >= gb->effective_window_y && x + 7 >= gb->io_registers[GB_IO_WX]) { in_window = true; } @@ -118,7 +133,7 @@ static uint32_t get_pixel(GB_gameboy_t *gb, uint8_t x, uint8_t y) } if (attributes & 0x80) { - priority = true; + priority = !bg_behind && bg_enabled; } if (!priority && sprite_pixel) { @@ -129,6 +144,10 @@ static uint32_t get_pixel(GB_gameboy_t *gb, uint8_t x, uint8_t y) return gb->sprite_palletes_rgb[sprite_palette * 4 + sprite_pixel]; } + if (!bg_enabled) { + return gb->background_palletes_rgb[0]; + } + if (gb->io_registers[GB_IO_LCDC] & 0x10) { tile_address = tile * 0x10; }