mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-11-04 01:45:08 +01:00
[Core/CD]
.added build-in TOC support for a few games that hang if no audio tracks are found or used .modified CD access/seek time emulation .improved CPU polling detection .improved SUB & MAIN-CPU synchronization (fixes Dracula Unleashed when using Model 2 US BIOS) .added missing reinitialization of MAIN-CPU PRG-RAM bank on reset
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EkeEke
parent
c9fb127730
commit
325f6dd5a7
@ -90,6 +90,26 @@ static const uint32 toc_shadow[15] =
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11637, 2547, 2521, 3856, 900
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};
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static const uint32 toc_dungeon[13] =
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{
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2250, 22950, 16350, 24900, 13875, 19950, 13800, 15375, 17400, 17100,
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3325, 6825, 25275
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};
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static const uint32 toc_ffight[26] =
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{
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11994, 9742, 10136, 9685, 9553, 14588, 9430, 8721, 9975, 9764,
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9704, 12796, 585, 754, 951, 624, 9047, 1068, 817, 9191, 1024,
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14562, 10320, 8627, 3795, 3047
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};
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static const uint32 toc_ffightj[29] =
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{
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11994, 9752, 10119, 9690, 9567, 14575, 9431, 8731, 9965, 9763,
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9716, 12791, 579, 751, 958, 630, 9050, 1052, 825, 9193, 1026,
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14553, 9834, 10542, 1699, 1792, 1781, 3783, 3052
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};
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/* supported WAVE file header (16-bit stereo samples @44.1kHz) */
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static const unsigned char waveHeader[32] =
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{
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@ -641,6 +661,45 @@ int cdd_load(char *filename, char *header)
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}
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while (cdd.toc.last < 15);
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}
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else if (strstr(header + 0x180,"T-143025") != NULL)
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{
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/* Dungeon Explorer */
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cdd.toc.last = cdd.toc.end = 0;
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do
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{
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cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end;
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cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + toc_dungeon[cdd.toc.last];
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cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end;
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cdd.toc.last++;
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}
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while (cdd.toc.last < 13);
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}
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else if (strstr(header + 0x180,"MK-4410") != NULL)
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{
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/* Final Fight CD (USA, Europe) */
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cdd.toc.last = cdd.toc.end = 0;
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do
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{
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cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end;
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cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + toc_ffight[cdd.toc.last];
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cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end;
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cdd.toc.last++;
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}
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while (cdd.toc.last < 26);
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}
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else if (strstr(header + 0x180,"G-6013") != NULL)
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{
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/* Final Fight CD (Japan) */
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cdd.toc.last = cdd.toc.end = 0;
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do
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{
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cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end;
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cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + toc_ffightj[cdd.toc.last];
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cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end;
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cdd.toc.last++;
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}
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while (cdd.toc.last < 29);
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}
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else
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{
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/* default TOC (99 tracks & 2s per audio tracks) */
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@ -1081,11 +1140,24 @@ void cdd_process(void)
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if (!cdd.latency)
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{
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/* Fixes a few games hanging during intro because they expect data to be read with some delay */
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/* Wolf Team games (Anet Futatabi, Cobra Command, Road Avenger & Time Gal) need at least 6 interrupts delay */
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/* Radical Rex needs at least one interrupt delay */
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/* Jeopardy needs at least 9 interrupts delay */
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/* Space Adventure Cobra (2nd morgue scene) needs at least 13 interrupts delay */
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cdd.latency = 13;
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/* Wolf Team games (Anet Futatabi, Cobra Command, Road Avenger & Time Gal) need at least 6 interrupts delay */
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/* Space Adventure Cobra (2nd morgue scene) needs at least 13 interrupts delay (incl. seek time, so 6 here is OK) */
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/* Jeopardy & ESPN Sunday Night NFL are picky about this as well: 7 interrupts delay (+ seek time) seems OK */
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cdd.latency = 7;
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}
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/* CD drive seek time */
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/* Some delay is especially needed when playing audio tracks located at the end of the disc (ex: Sonic CD intro) */
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/* max. seek time = 1.5s = 1.5 x 75 = 112.5 CDD interrupts (rounded to 120) for 270000 sectors max on disc */
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/* Note: this is only a rough approximation, on real hardware, drive seek time is much likely not linear */
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if (lba < cdd.lba)
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{
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cdd.latency += (((cdd.lba - lba) * 120) / 270000);
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}
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else
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{
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cdd.latency += (((lba - cdd.lba) * 120) / 270000);
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}
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/* update current track index */
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@ -1110,19 +1182,6 @@ void cdd_process(void)
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}
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else if (cdd.toc.tracks[index].fd)
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{
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/* CD drive seek time */
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/* Some delay is also needed when playing AUDIO tracks located at the end of the disc (ex: Sonic CD intro) */
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/* max. seek time = 1.5s = 1.5 x 75 = 112.5 CDD interrupts (rounded to 120) for 270000 sectors max on disc */
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/* Note: this is only a rough approximation, on real hardware, drive seek time is much likely not linear */
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if (lba < cdd.lba)
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{
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cdd.latency += (((cdd.lba - lba) * 120) / 270000);
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}
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else
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{
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cdd.latency += (((lba - cdd.lba) * 120) / 270000);
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}
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/* seek AUDIO track */
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if (lba < cdd.toc.tracks[index].start)
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{
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@ -212,7 +212,7 @@ static void s68k_poll_detect(reg)
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}
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/* restart SUB-CPU polling detection */
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s68k.poll.cycle = s68k.cycles + 320;
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s68k.poll.cycle = s68k.cycles + 392;
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s68k.poll.pc = s68k.pc;
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}
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@ -412,7 +412,7 @@ static unsigned int scd_read_word(unsigned int address)
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/* relative MAIN-CPU cycle counter */
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unsigned int cycles = (s68k.cycles * MCYCLES_PER_LINE) / SCYCLES_PER_LINE;
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/* sync MAIN-CPU with SUB-CPU */
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/* sync MAIN-CPU with SUB-CPU (Mighty Morphin Power Rangers) */
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if (!m68k.stopped && (m68k.cycles < cycles))
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{
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m68k_run(cycles);
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@ -1062,7 +1062,7 @@ void scd_init(void)
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{
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if (i & 2)
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{
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/* PRG-RAM (first 128KB bank, mirrored) */
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/* $020000-$03FFFF (resp. $420000-$43FFFF): PRG-RAM (first 128KB bank, mirrored each 256KB) */
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m68k.memory_map[i].base = scd.prg_ram + ((i & 1) << 16);
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m68k.memory_map[i].read8 = NULL;
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m68k.memory_map[i].read16 = NULL;
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@ -1074,7 +1074,8 @@ void scd_init(void)
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}
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else
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{
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/* internal ROM (128KB mirrored) (Flux expects it to be mapped at $440000-$45FFFF) */
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/* $000000-$01FFFF (resp. $400000-$41FFFF): internal ROM (128KB, mirrored each 256KB) */
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/* NB: Flux expects it to be mapped at $440000-$45FFFF */
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m68k.memory_map[i].base = scd.bootrom + ((i & 1) << 16);
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m68k.memory_map[i].read8 = NULL;
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m68k.memory_map[i].read16 = NULL;
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@ -1116,7 +1117,6 @@ void scd_init(void)
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/* $080000-$0BFFFF: Word-RAM in 2M mode (256KB)*/
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for (i=0x08; i<0x0c; i++)
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{
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/* allow Word-RAM access from both CPU in 2M mode (fixes sync issues in Mortal Kombat) */
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s68k.memory_map[i].base = scd.word_ram_2M + ((i & 3) << 16);
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s68k.memory_map[i].read8 = NULL;
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s68k.memory_map[i].read16 = NULL;
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@ -1167,6 +1167,8 @@ void scd_reset(int hard)
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/* TODO: figure what exactly is resetted when RESET bit is cleared by SUB-CPU */
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if (hard)
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{
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int i;
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/* Clear all ASIC registers by default */
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memset(scd.regs, 0, sizeof(scd.regs));
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@ -1183,6 +1185,14 @@ void scd_reset(int hard)
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/* 2M mode */
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word_ram_switch(0);
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/* reset PRG-RAM banking on MAIN-CPU side */
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for (i=scd.cartridge.boot+0x02; i<scd.cartridge.boot+0x20; i+=4)
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{
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/* MAIN-CPU: $020000-$03FFFF (resp. $420000-$43FFFF) mapped to first 128KB PRG-RAM bank (mirrored each 256KB) */
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m68k.memory_map[i].base = scd.prg_ram;
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m68k.memory_map[i+1].base = scd.prg_ram + 0x10000;
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}
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}
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else
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{
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@ -238,6 +238,13 @@ static void m68k_poll_detect(reg)
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#endif
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m68k.cycles = m68k.cycle_end;
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m68k.stopped = 1 << reg;
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/* return to current instruction */
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do
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{
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m68k.pc -= 2;
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}
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while (m68k.ir != *(uint16 *)(m68k.memory_map[(m68k.pc>>16)&0xff].base + (m68k.pc & 0xffff)));
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}
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return;
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}
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@ -249,7 +256,7 @@ static void m68k_poll_detect(reg)
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}
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/* restart MAIN-CPU polling detection */
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m68k.poll.cycle = m68k.cycles + 280;
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m68k.poll.cycle = m68k.cycles + 840;
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m68k.poll.pc = m68k.pc;
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}
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@ -335,6 +342,15 @@ unsigned int ctrl_io_read_byte(unsigned int address)
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/* SUB-CPU communication flags */
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if (index == 0x0f)
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{
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/* relative SUB-CPU cycle counter */
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unsigned int cycles = (m68k.cycles * SCYCLES_PER_LINE) / MCYCLES_PER_LINE;
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/* sync SUB-CPU with MAIN-CPU (Dracula Unleashed w/ Sega CD Model 2 OS ROM) */
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if (!s68k.stopped && (s68k.cycles < cycles))
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{
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s68k_run(cycles);
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}
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m68k_poll_detect(0x0f);
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return scd.regs[0x0f>>1].byte.l;
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}
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