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Timing improvements

This commit is contained in:
Lior Halphon 2020-02-24 00:20:58 +02:00
parent c22611c701
commit 3864ff37e1
1 changed files with 14 additions and 11 deletions
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25
Core/display.c
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@ -539,7 +539,6 @@ static void advance_fetcher_state_machine(GB_gameboy_t *gb)
GB_FETCHER_GET_TILE,
GB_FETCHER_GET_TILE_DATA_LOWER,
GB_FETCHER_GET_TILE_DATA_HIGH,
GB_ADVANCE_TILES,
GB_FETCHER_PUSH,
GB_FETCHER_SLEEP,
} fetcher_step_t;
@ -551,8 +550,8 @@ static void advance_fetcher_state_machine(GB_gameboy_t *gb)
GB_FETCHER_GET_TILE_DATA_LOWER,
GB_FETCHER_SLEEP,
GB_FETCHER_GET_TILE_DATA_HIGH,
GB_ADVANCE_TILES,
GB_FETCHER_PUSH,
GB_FETCHER_PUSH, // Compatibility
};
switch (fetcher_state_machine[gb->fetcher_state]) {
@ -657,7 +656,10 @@ static void advance_fetcher_state_machine(GB_gameboy_t *gb)
gb->fetcher_state++;
break;
case GB_ADVANCE_TILES: {
case GB_FETCHER_PUSH: {
if (fifo_size(&gb->bg_fifo) > 0) break;
if (gb->wx_triggered) {
gb->window_tile_x++;
gb->window_tile_x &= 0x1f;
@ -666,17 +668,12 @@ static void advance_fetcher_state_machine(GB_gameboy_t *gb)
gb->fetcher_x++;
gb->fetcher_x &= 0x1f;
}
gb->fetcher_state++;
}
case GB_FETCHER_PUSH: {
if (fifo_size(&gb->bg_fifo) > 0) 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->bg_fifo_paused = false;
gb->oam_fifo_paused = false;
gb->fetcher_state++;
gb->fetcher_state = 0;
}
break;
@ -984,12 +981,15 @@ void GB_display_run(GB_gameboy_t *gb, uint8_t cycles)
}
}
/* TODO: Can this be deleted? { */
advance_fetcher_state_machine(gb);
gb->cycles_for_line++;
GB_SLEEP(gb, display, 41, 1);
if (gb->object_fetch_aborted) {
goto abort_fetching_object;
}
/* } */
advance_fetcher_state_machine(gb);
gb->cycles_for_line += 3;
@ -1036,8 +1036,11 @@ abort_fetching_object:
/* Handle window */
/* Todo: verify timings */
if (!gb->wx_triggered && gb->wy_triggered && (gb->io_registers[GB_IO_LCDC] & 0x20)) {
if (gb->io_registers[GB_IO_WX] == gb->position_in_line + 7 ||
gb->io_registers[GB_IO_WX] == gb->position_in_line + 6) {
if (gb->io_registers[GB_IO_WX] >= 166) {
// Too late to enable the window
}
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_triggered = true;
gb->window_y++;
fifo_clear(&gb->bg_fifo);