Zero Point 2 (zeropnt2): reload issue

[StormedBubbles]

Hi again,

The two games mentioned in the title work very well in this emulator aside from reload issues. I get shots registered on the edges of the screen when trying to reload in both of these games for the vast majority of reload attempts. It will work occasionally, but I can't pinpoint the conditions.

It doesn't appear that newer MAME versions introduced any fixes for this particular issue for these two games, so hopefully this doesn't require any back-porting to fix 😊

[mahoneyt944]

Lethalj returns the value here

mame2003-plus-libretro/src/vidhrdw/lethalj_vidhrdw.c

Lines 48 to 74 in 379c0e9

	READ16_HANDLER( lethalj_gun_r )
	{
	data16_t result = 0;
	int beamx, beamy;
	switch (offset)
	{
	case 4:
	case 5:
	/* latch the crosshair position */
	get_crosshair_xy(offset - 4, &beamx, &beamy);
	gunx = beamx;
	guny = beamy;
	blank_palette = 1;
	break;
	case 6:
	result = gunx/2;
	break;
	case 7:
	result = guny + 4;
	break;
	}
	log_cb(RETRO_LOG_DEBUG, LOGPRE "%08X:lethalj_gun_r(%d) = %04X\n", activecpu_get_pc(), offset, result);
	return result;
	}

Would have to determine what value forces a reload. And check against a threshold.

[StormedBubbles]

I should also mention that Zero Point 2 has a dipswitch to disable the need for reloading. If getting reload to work for that game is too much of a hassle, disabling reload is a good option. That makes the game play like the first Zero Point anyway.

EDIT: and in Lethal Justice, reloading appears to be isolated to the corners of the screen instead of the whole border.

[StormedBubbles]

863389f resolved the issues with lethalj. Thanks! zeropnt2 still has some erratic behavior when reloading is attempted. Some offscreen shots register as on screen, and some on-screen shots register as off screen. A similar issue with this game was recently fixed in FBNeo.

[mahoneyt944]

Appears to be game specific, thanks for linking a good resource.