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More fixes, SGB emulation of the same quirk

This commit is contained in:
Lior Halphon 2020-02-21 16:16:02 +02:00
parent 91404edd13
commit 7d51ba3d97
3 changed files with 44 additions and 18 deletions
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19
Core/display.c
View File

@ -735,6 +735,7 @@ void GB_display_run(GB_gameboy_t *gb, uint8_t cycles)
GB_STATE(gb, display, 36);
GB_STATE(gb, display, 37);
GB_STATE(gb, display, 38);
GB_STATE(gb, display, 39);
}
@ -904,15 +905,16 @@ void GB_display_run(GB_gameboy_t *gb, uint8_t cycles)
gb->obj_comparators[gb->n_visible_objs - 1] < (uint8_t)(gb->position_in_line + 8)) {
gb->n_visible_objs--;
}
gb->during_object_fetch = true;
while (gb->n_visible_objs != 0 &&
(gb->io_registers[GB_IO_LCDC] & 2 || GB_is_cgb(gb)) &&
gb->obj_comparators[gb->n_visible_objs - 1] == (uint8_t)(gb->position_in_line + 8)) {
while (gb->fetcher_state < 5) {
advance_fetcher_state_machine(gb);
gb->cycles_for_line++;
GB_SLEEP(gb, display, 27, 1);
if (!(gb->io_registers[GB_IO_LCDC] & 2) && !GB_is_cgb(gb)) {
if (gb->object_fetch_aborted) {
goto abort_fetching_object;
}
}
@ -924,18 +926,20 @@ void GB_display_run(GB_gameboy_t *gb, uint8_t cycles)
GB_SLEEP(gb, display, 28, gb->extra_penalty_for_sprite_at_0);
gb->extra_penalty_for_sprite_at_0 = 0;
if (gb->object_fetch_aborted) {
gb->object_fetch_aborted = false;
goto abort_fetching_object;
}
}
}
gb->cycles_for_line += 6;
GB_SLEEP(gb, display, 20, 6);
gb->cycles_for_line += 5;
GB_SLEEP(gb, display, 20, 5);
if (gb->object_fetch_aborted) {
gb->object_fetch_aborted = false;
goto abort_fetching_object;
}
gb->during_object_fetch = false;
gb->cycles_for_line++;
GB_SLEEP(gb, display, 39, 1);
/* TODO: what does the PPU read if DMA is active? */
const GB_object_t *object = &objects[gb->visible_objs[gb->n_visible_objs - 1]];
if (gb->oam_ppu_blocked) {
@ -973,6 +977,9 @@ void GB_display_run(GB_gameboy_t *gb, uint8_t cycles)
}
abort_fetching_object:
gb->object_fetch_aborted = false;
gb->during_object_fetch = false;
/* Handle window */
/* Todo: Timing (Including penalty and access timings) not verified by test ROM */
if (!gb->in_window && window_enabled(gb) &&

1
Core/gb.h
View File

@ -519,6 +519,7 @@ struct GB_gameboy_internal_s {
bool vram_ppu_blocked;
bool cgb_palettes_ppu_blocked;
bool object_fetch_aborted;
bool during_object_fetch;
);
/* Unsaved data. This includes all pointers, as well as everything that shouldn't be on a save state */

42
Core/sm83_cpu.c
View File

@ -19,6 +19,7 @@ typedef enum {
GB_CONFLICT_PALETTE_DMG,
GB_CONFLICT_PALETTE_CGB,
GB_CONFLICT_DMG_LCDC,
GB_CONFLICT_SGB_LCDC,
} GB_conflict_t;
/* Todo: How does double speed mode affect these? */
@ -56,7 +57,7 @@ static const GB_conflict_t dmg_conflict_map[0x80] = {
static const GB_conflict_t sgb_conflict_map[0x80] = {
[GB_IO_IF] = GB_CONFLICT_WRITE_CPU,
[GB_IO_LYC] = GB_CONFLICT_READ_OLD,
[GB_IO_LCDC] = GB_CONFLICT_READ_NEW,
[GB_IO_LCDC] = GB_CONFLICT_SGB_LCDC,
[GB_IO_SCY] = GB_CONFLICT_READ_NEW,
[GB_IO_STAT] = GB_CONFLICT_STAT_DMG,
@ -207,16 +208,9 @@ static void cycle_write(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
uint8_t old_value = GB_read_memory(gb, addr);
GB_advance_cycles(gb, gb->pending_cycles - 2);
if (gb->current_lcd_line == 108) {
}
/* Handle disabling objects while already fetching an object */
if ((old_value & 2) && !(value & 2)) {
if (gb->display_state == 27) {
old_value &= ~2;
}
else if (gb->display_state == 20 || gb->display_state == 28) {
if (gb->during_object_fetch) {
gb->cycles_for_line -= gb->display_cycles;
gb->display_cycles = 0;
gb->object_fetch_aborted = true;
@ -231,10 +225,34 @@ static void cycle_write(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
GB_advance_cycles(gb, 1);
/* Handle disabling objects while already fetching an object */
if ((old_value & 2) && !(value & 2)) {
if (gb->display_state == 27) {
old_value &= ~2;
if (gb->during_object_fetch) {
gb->cycles_for_line -= gb->display_cycles;
gb->display_cycles = 0;
gb->object_fetch_aborted = true;
}
else if (gb->display_state == 20 || gb->display_state == 28) {
}
GB_write_memory(gb, addr, value);
gb->pending_cycles = 5;
return;
}
case GB_CONFLICT_SGB_LCDC: {
/* Simplified version of the above */
uint8_t old_value = GB_read_memory(gb, addr);
GB_advance_cycles(gb, gb->pending_cycles - 2);
/* Handle disabling objects while already fetching an object */
if ((old_value & 2) && !(value & 2)) {
if (gb->during_object_fetch) {
gb->cycles_for_line -= gb->display_cycles;
gb->display_cycles = 0;
gb->object_fetch_aborted = true;
}
}
GB_advance_cycles(gb, 1);
/* Handle disabling objects while already fetching an object */
if ((old_value & 2) && !(value & 2)) {
if (gb->during_object_fetch) {
gb->cycles_for_line -= gb->display_cycles;
gb->display_cycles = 0;
gb->object_fetch_aborted = true;