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Fixed graphical glitches caused by the last change to LCDC emulation

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This commit is contained in:
Lior Halphon 2016-06-17 02:27:32 +03:00
parent 6f73ee053d
commit 5723b82293
1 changed files with 16 additions and 15 deletions
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9
Core/display.c
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@ -327,7 +327,7 @@ void display_run(GB_gameboy_t *gb)
// LY = 144 interrupt bug
if (gb->io_registers[GB_IO_LY] == 144) {
/* User requests an interrupt on Mode 2 */
if (gb->display_cycles % LINE_LENGTH < 92 && gb->io_registers[GB_IO_STAT] & 0x20) { // Mode 2
if (gb->display_cycles % LINE_LENGTH < MODE2_LENGTH && gb->io_registers[GB_IO_STAT] & 0x20) { // Mode 2
gb->stat_interrupt_line = true;
}
}
@ -357,10 +357,9 @@ void display_run(GB_gameboy_t *gb)
goto updateSTAT;
}
if (gb->display_cycles % LINE_LENGTH < MODE2_LENGTH + MODE3_LENGTH) { /* Mode 3 */
if (last_mode != 3) {
}
/* Render. This chunk is outside the Mode 3 if, because otherwise we might not render some pixels, since this
function only runs between atomic CPU changes, and not every clock. */
signed short current_lcdc_x = ((gb->display_cycles % LINE_LENGTH - MODE2_LENGTH) & ~7) - (gb->effective_scx & 0x7);
for (;gb->previous_lcdc_x < current_lcdc_x; gb->previous_lcdc_x++) {
if (gb->previous_lcdc_x >= 160) {
@ -372,6 +371,8 @@ void display_run(GB_gameboy_t *gb)
gb->screen[gb->io_registers[GB_IO_LY] * 160 + gb->previous_lcdc_x] =
get_pixel(gb, gb->previous_lcdc_x, gb->io_registers[GB_IO_LY]);
}
if (gb->display_cycles % LINE_LENGTH < MODE2_LENGTH + MODE3_LENGTH) { /* Mode 3 */
gb->io_registers[GB_IO_STAT] |= 3; /* Set mode to 3 */
goto updateSTAT;
}