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Insert the pixel at the correct position

This commit is contained in:
Lior Halphon 2022-07-23 01:52:33 +03:00
parent f75f170448
commit f5f79f88ab
1 changed files with 15 additions and 15 deletions
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30
Core/display.c
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@ -908,6 +908,21 @@ static void advance_fetcher_state_machine(GB_gameboy_t *gb, unsigned *cycles)
}
if (fifo_size(&gb->bg_fifo) > 0) break;
if (unlikely(gb->wy_triggered && !(gb->io_registers[GB_IO_LCDC] & 0x20) && !GB_is_cgb(gb))) {
/* See https://github.com/LIJI32/SameBoy/issues/278 for documentation */
uint8_t logical_position = gb->position_in_line + 7;
if (logical_position > 167) {
logical_position = 0;
}
if (gb->io_registers[GB_IO_WX] == logical_position) {
gb->bg_fifo.read_end--;
gb->bg_fifo.read_end &= GB_FIFO_LENGTH - 1;
gb->bg_fifo.fifo[gb->bg_fifo.read_end] = (GB_fifo_item_t){0,};
gb->bg_fifo.size = 1;
break;
}
}
fifo_push_bg_row(&gb->bg_fifo, gb->current_tile_data[0], gb->current_tile_data[1],
gb->current_tile_attributes & 7, gb->current_tile_attributes & 0x80, gb->current_tile_attributes & 0x20);
gb->fetcher_state = 0;
@ -1702,21 +1717,6 @@ void GB_display_run(GB_gameboy_t *gb, unsigned cycles, bool force)
gb->bg_fifo.size++;
gb->window_is_being_fetched = false;
}
/* TODO: WX=0 behaves wrong, but WX=0 behaves wrong regardless in DMG mode */
if (!GB_is_cgb(gb) && gb->wy_triggered && !(gb->io_registers[GB_IO_LCDC] & 0x20) && gb->bg_fifo.size == 1) {
/* See https://github.com/LIJI32/SameBoy/issues/278 for documentation */
uint8_t logical_position = gb->position_in_line + 8;
if (logical_position > 167) {
logical_position = 0;
}
if (gb->io_registers[GB_IO_WX] == logical_position) {
gb->bg_fifo.read_end--;
gb->bg_fifo.read_end &= GB_FIFO_LENGTH - 1;
gb->bg_fifo.fifo[gb->bg_fifo.read_end] = (GB_fifo_item_t){0,};
gb->bg_fifo.size = 2;
}
}
/* Handle objects */
/* When the object enabled bit is off, this proccess is skipped entirely on the DMG, but not on the CGB.