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Turns out the behavior differs between DMG and CGB – in DMG mode, the objects enabled bit is checked before halting the FIFOs, meaning that disabled sprites do not affect Mode 3’s length on the DMG.

This commit is contained in:
Lior Halphon 2018-03-23 20:01:27 +03:00
parent 48a8db233d
commit 4e3928df81
1 changed files with 3 additions and 0 deletions
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3
Core/display.c
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@ -536,7 +536,10 @@ void GB_display_run(GB_gameboy_t *gb, uint8_t cycles)
gb->in_window = false; gb->in_window = false;
while (true) { while (true) {
/* Handle objects */ /* Handle objects */
/* When the sprite enabled bit is off, this proccess is skipped entirely on the DMG, but not on the CGB.
On the CGB, this bit is checked only when the pixel is actually popped from the FIFO. */
while (gb->n_visible_objs != 0 && while (gb->n_visible_objs != 0 &&
(gb->io_registers[GB_IO_LCDC] & 2 || gb->is_cgb) &&
objects[gb->visible_objs[gb->n_visible_objs - 1]].x == (uint8_t)(gb->position_in_line + 8)) { objects[gb->visible_objs[gb->n_visible_objs - 1]].x == (uint8_t)(gb->position_in_line + 8)) {
if (!gb->fetching_objects) { if (!gb->fetching_objects) {