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In double speed mode, there are no quirks where IF and STAT don’t update together

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This commit is contained in:
Lior Halphon 2018-03-09 23:31:49 +02:00
parent cb6bb0590e
commit e8b107efdb
1 changed files with 13 additions and 4 deletions
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17
Core/display.c
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@ -610,13 +610,22 @@ void GB_display_run(GB_gameboy_t *gb, uint8_t cycles)
gb->cycles_for_line += MODE3_LENGTH + (gb->io_registers[GB_IO_SCX] & 7);
GB_SLEEP(gb, display, 3, MODE3_LENGTH + (gb->io_registers[GB_IO_SCX] & 7));
if (!gb->cgb_double_speed) {
gb->io_registers[GB_IO_STAT] &= ~3;
gb->oam_read_blocked = false;
gb->vram_read_blocked = false;
gb->oam_write_blocked = false;
gb->vram_write_blocked = false;
}
gb->cycles_for_line += 1;
GB_SLEEP(gb, display, 4, 1);
gb->io_registers[GB_IO_STAT] &= ~3;
gb->oam_read_blocked = false;
gb->vram_read_blocked = false;
gb->oam_write_blocked = false;
gb->vram_write_blocked = false;
gb->cycles_for_line += 1;
GB_SLEEP(gb, display, 4, 1);
GB_STAT_update(gb);
/* Mode 0 is shorter in the very first line */
GB_SLEEP(gb, display, 5, LINE_LENGTH - gb->cycles_for_line - 8);
@ -632,8 +641,8 @@ void GB_display_run(GB_gameboy_t *gb, uint8_t cycles)
gb->ly_for_comparison = gb->current_line? -1 : gb->current_line;
/* The OAM STAT interrupt occurs 1 T-cycle before STAT actually changes, except on line 0.
PPU glitch? */
if (gb->current_line != 0) {
PPU glitch? (Todo: and in double speed mode?) */
if (gb->current_line != 0 && gb->cgb_double_speed) {
gb->io_registers[GB_IO_STAT] &= ~3;
gb->io_registers[GB_IO_STAT] |= 2;
}