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More accurate emulation of window timing, actual correct fix of #123

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This commit is contained in:
Lior Halphon 2020-12-23 23:49:57 +02:00
parent 7a3ebb708c
commit 8f64f49c3b
2 changed files with 23 additions and 26 deletions
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40
Core/display.c
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@ -821,7 +821,7 @@ void GB_display_run(GB_gameboy_t *gb, uint8_t cycles)
GB_STATE(gb, display, 28);
GB_STATE(gb, display, 29);
GB_STATE(gb, display, 30);
// GB_STATE(gb, display, 31);
GB_STATE(gb, display, 31);
GB_STATE(gb, display, 32);
GB_STATE(gb, display, 33);
GB_STATE(gb, display, 34);
@ -853,13 +853,7 @@ void GB_display_run(GB_gameboy_t *gb, uint8_t cycles)
/* Handle mode 2 on the very first line 0 */
gb->current_line = 0;
gb->window_y = -1;
/* Todo: verify timings */
if (gb->io_registers[GB_IO_WY] == 0) {
gb->wy_triggered = true;
}
else {
gb->wy_triggered = false;
}
gb->ly_for_comparison = 0;
gb->io_registers[GB_IO_STAT] &= ~3;
@ -910,11 +904,6 @@ void GB_display_run(GB_gameboy_t *gb, uint8_t cycles)
/* Lines 0 - 143 */
gb->window_y = -1;
for (; gb->current_line < LINES; gb->current_line++) {
/* Todo: verify timings */
if ((gb->io_registers[GB_IO_WY] == gb->current_line ||
(gb->current_line != 0 && gb->io_registers[GB_IO_WY] == gb->current_line - 1))) {
gb->wy_triggered = true;
}
gb->oam_write_blocked = GB_is_cgb(gb) && !gb->cgb_double_speed;
gb->accessed_oam_row = 0;
@ -994,6 +983,12 @@ void GB_display_run(GB_gameboy_t *gb, uint8_t cycles)
gb->cycles_for_line += 2;
GB_SLEEP(gb, display, 32, 2);
mode_3_start:
/* Todo: verify timings */
if ((gb->io_registers[GB_IO_LCDC] & 0x20) &&
(gb->io_registers[GB_IO_WY] == 0) &&
gb->current_line == 0) {
gb->wy_triggered = true;
}
fifo_clear(&gb->bg_fifo);
fifo_clear(&gb->oam_fifo);
@ -1021,7 +1016,7 @@ void GB_display_run(GB_gameboy_t *gb, uint8_t cycles)
bool should_activate_window = false;
if (gb->io_registers[GB_IO_WX] == 0) {
static const uint8_t scx_to_wx0_comparisons[] = {-7, -9, -10, -11, -12, -13, -14, -14};
if (gb->position_in_line == scx_to_wx0_comparisons[gb->io_registers[GB_IO_SCX] & 7] && !GB_is_cgb(gb)) {
if (gb->position_in_line == scx_to_wx0_comparisons[gb->io_registers[GB_IO_SCX] & 7]) {
should_activate_window = true;
}
}
@ -1243,7 +1238,17 @@ abort_fetching_object:
if (gb->hdma_on_hblank) {
gb->hdma_starting = true;
}
GB_SLEEP(gb, display, 11, LINE_LENGTH - gb->cycles_for_line);
GB_SLEEP(gb, display, 11, LINE_LENGTH - gb->cycles_for_line - 2);
/*
TODO: Verify double speed timing
TODO: Line 0 behaves differently when enabling the window during the transition between mode 2 to 3
*/
if ((gb->io_registers[GB_IO_LCDC] & 0x20) &&
(gb->io_registers[GB_IO_WY] == gb->current_line ||
gb->io_registers[GB_IO_WY] == gb->current_line + 1)) {
gb->wy_triggered = true;
}
GB_SLEEP(gb, display, 31, 2);
gb->mode_for_interrupt = 2;
// Todo: unverified timing
@ -1337,14 +1342,7 @@ abort_fetching_object:
gb->current_line = 0;
/* Todo: verify timings */
if ((gb->io_registers[GB_IO_LCDC] & 0x20) &&
(gb->io_registers[GB_IO_WY] == 0)) {
gb->wy_triggered = true;
}
else {
gb->wy_triggered = false;
}
// TODO: not the correct timing
gb->current_lcd_line = 0;

5
Core/sm83_cpu.c
View File

@ -380,9 +380,8 @@ static void stop(GB_gameboy_t *gb, uint8_t opcode)
else {
GB_timing_sync(gb);
if ((gb->io_registers[GB_IO_JOYP] & 0xF) != 0xF) {
/* HW Bug? When STOP is executed while a button is down, the CPU halts forever
yet the other hardware keeps running. */
gb->interrupt_enable = 0;
/* TODO: HW Bug? When STOP is executed while a button is down, the CPU enters halt
mode instead. Fine details not confirmed yet. */
gb->halted = true;
}
else {