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WX access conflicts

This commit is contained in:
Lior Halphon 2020-02-27 00:12:42 +02:00
parent 9c7a8fdb1b
commit 89303ab046
3 changed files with 16 additions and 3 deletions
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2
Core/display.c
View File

@ -1042,7 +1042,7 @@ abort_fetching_object:
// 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->io_registers[GB_IO_WX] == (uint8_t) (gb->position_in_line + 6) && !gb->wx_just_changed)) {
gb->window_y++;
if (gb->io_registers[GB_IO_WX] != 166) {
gb->wx_triggered = true;

3
Core/gb.h
View File

@ -651,6 +651,9 @@ struct GB_gameboy_internal_s {
bool vblank_just_occured; // For slow operations involving syscalls; these should only run once per vblank
uint8_t cycles_since_run; // How many cycles have passed since the last call to GB_run(), in 8MHz units
double clock_multiplier;
/* Temporary state */
bool wx_just_changed;
);
};

14
Core/sm83_cpu.c
View File

@ -20,6 +20,7 @@ typedef enum {
GB_CONFLICT_PALETTE_CGB,
GB_CONFLICT_DMG_LCDC,
GB_CONFLICT_SGB_LCDC,
GB_CONFLICT_WX,
} GB_conflict_t;
/* Todo: How does double speed mode affect these? */
@ -46,9 +47,9 @@ static const GB_conflict_t dmg_conflict_map[0x80] = {
[GB_IO_OBP0] = GB_CONFLICT_PALETTE_DMG,
[GB_IO_OBP1] = GB_CONFLICT_PALETTE_DMG,
[GB_IO_WY] = GB_CONFLICT_READ_OLD,
[GB_IO_WX] = GB_CONFLICT_WX,
/* Todo: these were not verified at all */
[GB_IO_WX] = GB_CONFLICT_READ_NEW,
[GB_IO_SCX] = GB_CONFLICT_READ_NEW,
};
@ -64,9 +65,9 @@ static const GB_conflict_t sgb_conflict_map[0x80] = {
[GB_IO_OBP0] = GB_CONFLICT_READ_NEW,
[GB_IO_OBP1] = GB_CONFLICT_READ_NEW,
[GB_IO_WY] = GB_CONFLICT_READ_OLD,
[GB_IO_WX] = GB_CONFLICT_WX,
/* Todo: these were not verified at all */
[GB_IO_WX] = GB_CONFLICT_READ_NEW,
[GB_IO_SCX] = GB_CONFLICT_READ_NEW,
};
@ -261,6 +262,15 @@ static void cycle_write(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
gb->pending_cycles = 5;
return;
}
case GB_CONFLICT_WX:
GB_advance_cycles(gb, gb->pending_cycles);
GB_write_memory(gb, addr, value);
gb->wx_just_changed = true;
GB_advance_cycles(gb, 1);
gb->wx_just_changed = false;
gb->pending_cycles = 3;
return;
}
}