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Prevent Hblank HDMAs when the LCD is off

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This commit is contained in:
Lior Halphon 2017-02-21 22:33:09 +02:00
parent f4a364c3db
commit c5ce14dad1
1 changed files with 8 additions and 1 deletions
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9
Core/display.c
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@ -315,13 +315,20 @@ static void update_display_state(GB_gameboy_t *gb, uint8_t cycles)
gb->stat_interrupt_line = false; gb->stat_interrupt_line = false;
if (!(gb->io_registers[GB_IO_LCDC] & 0x80)) { if (!(gb->io_registers[GB_IO_LCDC] & 0x80)) {
/* LCD is disabled, do nothing */ /* LCD is disabled, state is constant */
/* When the LCD is off, LY is 0 and STAT mode is 0. /* When the LCD is off, LY is 0 and STAT mode is 0.
Todo: Verify the LY=LYC flag should be on. */ Todo: Verify the LY=LYC flag should be on. */
gb->io_registers[GB_IO_LY] = 0; gb->io_registers[GB_IO_LY] = 0;
gb->io_registers[GB_IO_STAT] &= ~3; gb->io_registers[GB_IO_STAT] &= ~3;
gb->io_registers[GB_IO_STAT] |= 4; gb->io_registers[GB_IO_STAT] |= 4;
if (gb->hdma_on_hblank) {
gb->hdma_on_hblank = false;
gb->hdma_on = false;
/* Todo: is this correct? */
gb->hdma_steps_left = 0xff;
}
/* Keep sending vblanks to user even if the screen is off */ /* Keep sending vblanks to user even if the screen is off */
gb->display_cycles += cycles; gb->display_cycles += cycles;