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WX=0 emulation

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This commit is contained in:
Lior Halphon 2020-02-29 18:26:16 +02:00
parent 39b999a68b
commit 5ca602fbd2
1 changed files with 9 additions and 2 deletions
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11
Core/display.c
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@ -772,7 +772,7 @@ void GB_display_run(GB_gameboy_t *gb, uint8_t cycles)
GB_STATE(gb, display, 40); GB_STATE(gb, display, 40);
GB_STATE(gb, display, 41); GB_STATE(gb, display, 41);
GB_STATE(gb, display, 42); GB_STATE(gb, display, 42);
GB_STATE(gb, display, 43);
} }
if (!(gb->io_registers[GB_IO_LCDC] & 0x80)) { if (!(gb->io_registers[GB_IO_LCDC] & 0x80)) {
@ -948,14 +948,21 @@ void GB_display_run(GB_gameboy_t *gb, uint8_t cycles)
while (true) { while (true) {
/* Handle window */ /* Handle window */
/* Todo: verify timings */ /* Todo: verify timings */
static const uint8_t scx_to_wx0_comparisons[] = {-7, -9, -10, -11, -12, -13, -14, -14};
if (!gb->wx_triggered && gb->wy_triggered && (gb->io_registers[GB_IO_LCDC] & 0x20)) { if (!gb->wx_triggered && gb->wy_triggered && (gb->io_registers[GB_IO_LCDC] & 0x20)) {
if (gb->io_registers[GB_IO_WX] >= 167) { if (gb->io_registers[GB_IO_WX] >= 167) {
// Too late to enable the window // Too late to enable the window
} }
else if (gb->io_registers[GB_IO_WX] == (uint8_t) (gb->position_in_line + 7) || else if (gb->io_registers[GB_IO_WX] == (uint8_t) (gb->position_in_line + 7) ||
(gb->io_registers[GB_IO_WX] == (uint8_t) (gb->position_in_line + 6) && !gb->wx_just_changed)) { (gb->io_registers[GB_IO_WX] == (uint8_t) (gb->position_in_line + 6) && !gb->wx_just_changed) ||
(gb->io_registers[GB_IO_WX] == 0 && (gb->position_in_line) == scx_to_wx0_comparisons[gb->io_registers[GB_IO_SCX] & 7])) {
gb->window_y++; gb->window_y++;
if (gb->io_registers[GB_IO_WX] != 166) { if (gb->io_registers[GB_IO_WX] != 166) {
/* TODO: Verify fetcher access timings in this case */
if (gb->io_registers[GB_IO_WX] == 0 && (gb->io_registers[GB_IO_SCX] & 7)) {
gb->cycles_for_line++;
GB_SLEEP(gb, display, 43, 1);
}
gb->wx_triggered = true; gb->wx_triggered = true;
gb->window_tile_x = 0; gb->window_tile_x = 0;
fifo_clear(&gb->bg_fifo); fifo_clear(&gb->bg_fifo);