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SCX now effects Mode 3’s length. Fixes hblank_ly_scx_timing-GS

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This commit is contained in:
Lior Halphon 2017-02-25 23:30:31 +02:00
parent 55e54d9499
commit 4bf391b1c8
1 changed files with 5 additions and 4 deletions
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9
Core/display.c
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@ -346,6 +346,8 @@ static void update_display_state(GB_gameboy_t *gb, uint8_t cycles)
uint8_t atomic_increase = gb->cgb_double_speed? 2 : 4;
uint8_t stat_delay = gb->cgb_double_speed? 2 : (gb->cgb_mode? 0 : 4);
/* This is correct for DMG. Is it correct for the 3 CGB modes (DMG/single/double)?*/
uint8_t scx_delay = ((gb->effective_scx & 7) + atomic_increase - 1) & ~(atomic_increase - 1);
for (; cycles; cycles -= atomic_increase) {
gb->display_cycles += atomic_increase;
@ -399,8 +401,10 @@ static void update_display_state(GB_gameboy_t *gb, uint8_t cycles)
else if (position_in_line == MODE2_LENGTH + stat_delay) {
gb->io_registers[GB_IO_STAT] &= ~3;
gb->io_registers[GB_IO_STAT] |= 3;
gb->effective_scx = gb->io_registers[GB_IO_SCX];
gb->previous_lcdc_x = - (gb->effective_scx & 0x7);
}
else if (position_in_line == MODE2_LENGTH + MODE3_LENGTH + stat_delay) {
else if (position_in_line == MODE2_LENGTH + MODE3_LENGTH + stat_delay + scx_delay) {
gb->io_registers[GB_IO_STAT] &= ~3;
if (gb->hdma_on_hblank) {
gb->hdma_on = true;
@ -566,9 +570,6 @@ void GB_display_run(GB_gameboy_t *gb, uint8_t cycles)
if (gb->effective_window_enabled && gb->effective_window_y == 0xFF) {
gb->effective_window_y = effective_ly;
}
gb->effective_scx = gb->io_registers[GB_IO_SCX];
gb->previous_lcdc_x = - (gb->effective_scx & 0x7);
return;
}