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Proper fix for WX=0 in the window pixel insertion glitch

This commit is contained in:
Lior Halphon 2022-07-22 19:51:38 +03:00
parent 029b7492b6
commit f75f170448
1 changed files with 3 additions and 0 deletions
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3
Core/display.c
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@ -1707,6 +1707,9 @@ void GB_display_run(GB_gameboy_t *gb, unsigned cycles, bool force)
if (!GB_is_cgb(gb) && gb->wy_triggered && !(gb->io_registers[GB_IO_LCDC] & 0x20) && gb->bg_fifo.size == 1) { 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 */ /* See https://github.com/LIJI32/SameBoy/issues/278 for documentation */
uint8_t logical_position = gb->position_in_line + 8; 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) { if (gb->io_registers[GB_IO_WX] == logical_position) {
gb->bg_fifo.read_end--; gb->bg_fifo.read_end--;
gb->bg_fifo.read_end &= GB_FIFO_LENGTH - 1; gb->bg_fifo.read_end &= GB_FIFO_LENGTH - 1;