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https://github.com/ekeeke/Genesis-Plus-GX.git
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fixed YM2612 registers on reset, fixed max Frequency increment value (Nemesis)
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ekeeke31
parent
fbbd1d6057
commit
4c374d034a
@ -4,8 +4,10 @@ Genesis Plus for Gamecube
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CURRENT:
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---------
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[Genesis]
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- YM2612(MAME): improved Enveloppe Generator accuracy: fix tracks #3 and #9 in Mega Turrican
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- YM2612(MAME): fixed SSG-EG emulation bug: fix Level 1 music in Alisia Dragoon
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- YM2612(MAME): improved Enveloppe Generator accuracy, fix tracks #3 and #9 in Mega Turrican
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- YM2612(MAME): fixed a bug in SSG-EG emulation code, fix Level 1 music in Alisia Dragoon
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- YM2612(MAME): improved Detune overflow accuracy, fix high-frequency sound effects & musics in many games
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- YM2612(MAME): fixed registers 0x20-0x26 Reset state, fix intro music in B.O.B
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[NGC/Wii]
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- improved menu scrolling using Wiimote D-PAD
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@ -583,11 +583,10 @@ void render_shutdown(void)
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void remap_buffer(int line, int width)
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{
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/* get line offset from framebuffer */
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int offset = vdp_pal ? bitmap.viewport.y : (bitmap.viewport.y*11/8); // NTSC is 243 lines
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int vline = (line + offset) % lines_per_frame;
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int vline = (line + bitmap.viewport.y) % lines_per_frame;
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/* illegal video mode (screen rolls up) */
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if (!vdp_pal && (reg[1] & 8)) vline = (vline + frame_cnt)%240;
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if ((reg[1] & 8) && !vdp_pal) vline = (vline + frame_cnt)%240;
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/* double resolution mode */
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if (config.render && interlaced) vline = (vline * 2) + odd_frame;
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@ -12,18 +12,18 @@
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/*
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** History:
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**
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** 2006-2008 Eke-Eke (Gamecube/Wii genesis plus port):
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** 2006-2008 Eke-Eke (gamecube&wii port of Genesis Plus):
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** - fixed internal FM timer emulation
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** - removed unused multichip support and YMxxx support
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** - fixed CH3 CSM mode (credits to Nemesis)
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** - implemented PG overflow, aka "detune bug" (Ariel, Comix Zone, Shaq Fu, Spiderman,...), credits to Nemesis
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** - fixed SSG-EG support, credits to Nemesis
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** - fixed CH3 CSM mode (which games actually use this ?), credits to Nemesis
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** - implemented Detune overflow (Ariel, Comix Zone, Shaq Fu, Spiderman & many others), credits to Nemesis
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** - fixed SSG-EG support (Asterix, Bubba'n Six & many others), thanks to Nemesis for his tests
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** - modified EG rates, tested by Nemesis on real hardware
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** - fixed EG attenuation level on KEY ON (Ecco 2 splash sound)
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** - fixed LFO phase update for CH3 special mode (Warlock, Alladin), thanks to AamirM
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** - fixed Attack rate refresh (fix Batman&Robin introduction)$
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** - fixed attenuation level at the start of Substain (Gynoug ?)
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** - fixed EG updates in some specific cases (AR maximal and/or Susbstain Level minimal)
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** - implemented LFO phase update for CH3 special mode (Warlock birds, Alladin bug sound)
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** - fixed Attack Rate update (Batman & Robin intro)
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** - fixed attenuation level at the start of Substain (Gynoug explosions)
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** - fixed EG updates when AR is maximal and/or SL minimal (Mega Turrican tracks 03,09...)
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**
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** 03-08-2003 Jarek Burczynski:
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** - fixed YM2608 initial values (after the reset)
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@ -931,6 +931,7 @@ INLINE void advance_eg_channel(FM_SLOT *SLOT)
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SLOT->volume += (~SLOT->volume * (eg_inc[SLOT->eg_sel_ar + ((ym2612.OPN.eg_cnt>>SLOT->eg_sh_ar)&7)]))>>4;
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if (SLOT->volume <= MIN_ATT_INDEX)
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{
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/* switch to Release or Substain Phase (Eke-Eke) */
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SLOT->volume = MIN_ATT_INDEX;
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SLOT->state = (SLOT->sl == MIN_ATT_INDEX) ? EG_SUS : EG_DEC;
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}
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@ -942,8 +943,8 @@ INLINE void advance_eg_channel(FM_SLOT *SLOT)
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{
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if ( !(ym2612.OPN.eg_cnt & ((1<<SLOT->eg_sh_d1r)-1) ) )
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{
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//SLOT->volume += 4 * eg_inc[SLOT->eg_sel_d1r + ((ym2612.OPN.eg_cnt>>SLOT->eg_sh_d1r)&7)];
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SLOT->volume += 6 * eg_inc[SLOT->eg_sel_d1r + ((ym2612.OPN.eg_cnt>>SLOT->eg_sh_d1r)&7)]; /* from Nemesis */
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/* Nemesis */
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SLOT->volume += 6 * eg_inc[SLOT->eg_sel_d1r + ((ym2612.OPN.eg_cnt>>SLOT->eg_sh_d1r)&7)];
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if ( SLOT->volume >= (INT32)(SLOT->sl) )
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{
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@ -972,8 +973,8 @@ INLINE void advance_eg_channel(FM_SLOT *SLOT)
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{
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if ( !(ym2612.OPN.eg_cnt & ((1<<SLOT->eg_sh_d2r)-1) ) )
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{
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//SLOT->volume += 4 * eg_inc[SLOT->eg_sel_d2r + ((ym2612.OPN.eg_cnt>>SLOT->eg_sh_d2r)&7)];
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SLOT->volume += 6 * eg_inc[SLOT->eg_sel_d2r + ((ym2612.OPN.eg_cnt>>SLOT->eg_sh_d2r)&7)]; /* from Nemesis */
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/* Nemesis */
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SLOT->volume += 6 * eg_inc[SLOT->eg_sel_d2r + ((ym2612.OPN.eg_cnt>>SLOT->eg_sh_d2r)&7)];
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if ( SLOT->volume >= MAX_ATT_INDEX)
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{
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@ -1003,7 +1004,7 @@ INLINE void advance_eg_channel(FM_SLOT *SLOT)
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}
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else
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{
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/* Attack Rate is maximal: directly switch to Decay */
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/* Attack Rate is maximal: directly switch to Decay (or Substain) */
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SLOT->volume = MIN_ATT_INDEX;
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SLOT->state = (SLOT->sl == MIN_ATT_INDEX) ? EG_SUS : EG_DEC;
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}
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@ -1033,7 +1034,8 @@ INLINE void advance_eg_channel(FM_SLOT *SLOT)
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if ( !(ym2612.OPN.eg_cnt & ((1<<SLOT->eg_sh_rr)-1) ) )
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{
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if (SLOT->ssg&0x08)
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SLOT->volume += 6 * eg_inc[SLOT->eg_sel_rr + ((ym2612.OPN.eg_cnt>>SLOT->eg_sh_rr)&7)]; /* from Nemesis */
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/* SSG-EG affects Release Phase also (Nemesis) */
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SLOT->volume += 6 * eg_inc[SLOT->eg_sel_rr + ((ym2612.OPN.eg_cnt>>SLOT->eg_sh_rr)&7)];
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else
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SLOT->volume += eg_inc[SLOT->eg_sel_rr + ((ym2612.OPN.eg_cnt>>SLOT->eg_sh_rr)&7)];
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@ -1401,29 +1403,29 @@ static int init_tables(void)
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}
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/* CSM Key Controll (correct implementation, credits to Nemesis) */
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/* CSM Key Controll */
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INLINE void CSMKeyControll(FM_CH *CH)
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{
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/* all key on/off */
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if (CH->SLOT[SLOT1].state == EG_REL)
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/* all key ON/OFF (only for operator which have been OFF)*/
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if (!CH->SLOT[SLOT1].key)
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{
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FM_KEYON(CH,SLOT1);
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FM_KEYOFF(CH,SLOT1);
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}
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if (CH->SLOT[SLOT2].state == EG_REL)
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if (!CH->SLOT[SLOT2].key)
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{
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FM_KEYON(CH,SLOT2);
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FM_KEYOFF(CH,SLOT2);
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}
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if (CH->SLOT[SLOT3].state == EG_REL)
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if (!CH->SLOT[SLOT3].key)
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{
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FM_KEYON(CH,SLOT3);
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FM_KEYOFF(CH,SLOT3);
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}
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if (CH->SLOT[SLOT4].state == EG_REL)
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if (!CH->SLOT[SLOT4].key)
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{
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FM_KEYON(CH,SLOT4);
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FM_KEYOFF(CH,SLOT4);
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@ -1480,8 +1482,6 @@ static void OPNSetPres(int pres)
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/* timer increment in usecs (timers are incremented after each updated samples) */
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ym2612.OPN.ST.TimerBase = (int) (ym2612.OPN.ST.freqbase * 4096.0);
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/* make time tables */
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init_timetables(dt_tab);
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@ -1495,8 +1495,8 @@ static void OPNSetPres(int pres)
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ym2612.OPN.fn_table[i] = (UINT32)( (double)i * 32 * ym2612.OPN.ST.freqbase * (1<<(FREQ_SH-10)) ); /* -10 because chip works with 10.10 fixed point, while we use 16.16 */
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}
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/* maximal frequency, used for overflow, best setting with BLOCK=5 (notaz) */
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fn_max = ((UINT32)((double)ym2612.OPN.fn_table[0x7ff*2] / ym2612.OPN.ST.freqbase) >> 2);
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/* maximal frequency, used for overflow, internal register is 17-bits (Nemesis) */
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fn_max = (UINT32)( (double)0x1ffff * ym2612.OPN.ST.freqbase * (1<<(FREQ_SH-10)) );
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/* LFO freq. table */
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for(i = 0; i < 8; i++)
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@ -1508,7 +1508,6 @@ static void OPNSetPres(int pres)
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}
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/* write a OPN mode register 0x20-0x2f */
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static void OPNWriteMode(int r, int v)
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{
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@ -1799,10 +1798,9 @@ void YM2612UpdateOne(int **buffer, int length)
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chan_calc(&ym2612.CH[2]);
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chan_calc(&ym2612.CH[3]);
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chan_calc(&ym2612.CH[4]);
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/* DAC Mode */
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if (ym2612.dacen)
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{
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/* DAC Mode */
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*(ym2612.CH[5].connect4) += ym2612.dacout;
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}
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else chan_calc(&ym2612.CH[5]);
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@ -1893,7 +1891,7 @@ int YM2612ResetChip(void)
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OPNWriteReg(i ,0);
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OPNWriteReg(i|0x100,0);
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}
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for(i = 0x26 ; i >= 0x20 ; i-- ) OPNWriteReg(i,0);
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for(i = 0x26 ; i >= 0x20 ; i-- ) OPNWriteMode(i,0);
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/* DAC mode clear */
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ym2612.dacen = 0;
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