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[Core/VDP] improved HVC latch behavior when not locked in hardware but forced for gun emulation ("Gunfight - 3 in 1" randomization issues when Justifier is enabled)
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@ -2,7 +2,7 @@
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* Genesis Plus
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* Sega Light Phaser, Menacer & Konami Justifiers support
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*
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* Copyright (C) 2007-2011 Eke-Eke (Genesis Plus GX)
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* Copyright (C) 2007-2013 Eke-Eke (Genesis Plus GX)
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*
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* Redistribution and use of this code or any derivative works are permitted
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* provided that the following conditions are met:
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@ -135,7 +135,7 @@ void lightgun_refresh(int port)
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m68k_update_irq(2);
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}
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/* force HV Counter Latch (some games does not lock HV Counter but instead use larger offset value) */
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/* HACK: force HV Counter latch (some games does not lock HV Counter but instead use larger offset value) */
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hvc_latch = 0x10000 | (y << 8);
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if (reg[12] & 1)
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{
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@ -2,7 +2,7 @@
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* Genesis Plus
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* Sega Light Phaser, Menacer & Konami Justifiers support
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*
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* Copyright (C) 2007-2011 Eke-Eke (Genesis Plus GX)
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* Copyright (C) 2007-2013 Eke-Eke (Genesis Plus GX)
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*
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* Redistribution and use of this code or any derivative works are permitted
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* provided that the following conditions are met:
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@ -1370,17 +1370,26 @@ unsigned int vdp_hvc_r(unsigned int cycles)
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}
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else
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{
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/* Mode 5: HV counters are frozen (cf. lightgun games & Sunset Riders) */
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if (reg[1] & 4)
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{
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/* Mode 5: both counters are frozen (Lightgun games, Sunset Riders) */
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/* check if HVC is really locked or is read within INT2 callback (HVC latch is forced for lightgun emulation, cf. lightgun.c) */
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if ((reg[0] & 0x02) || (m68k.int_mask == 0x0200))
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{
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#ifdef LOGVDP
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error("[%d(%d)][%d(%d)] HVC read -> 0x%x (%x)\n", v_counter, (cycles/MCYCLES_PER_LINE-1)%lines_per_frame, cycles, cycles%MCYCLES_PER_LINE, hvc_latch & 0xffff, m68k_get_reg(M68K_REG_PC));
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error("[%d(%d)][%d(%d)] HVC read -> 0x%x (%x)\n", v_counter, (cycles/MCYCLES_PER_LINE-1)%lines_per_frame, cycles, cycles%MCYCLES_PER_LINE, data & 0xffff, m68k_get_reg(M68K_REG_PC));
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#endif
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return (data & 0xffff);
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/* return latched HVC value */
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return (data & 0xffff);
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}
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/* HV counters should be free-running (fixes "Gunfight - 3 in 1" randomization when Justifiers are enabled) */
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hvc_latch = 0;
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data = hctab[cycles % MCYCLES_PER_LINE];
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}
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else
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{
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/* Mode 4: VCounter runs normally, HCounter is frozen */
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/* Mode 4: V counter runs normally, H counter is frozen */
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data &= 0xff;
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}
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}
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