mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-11-10 21:05:12 +01:00
Merge pull request #181 from libretro/master
[Core/CPU] add optional 68K and Z80 overclocking
This commit is contained in:
commit
2345d98b69
@ -437,9 +437,11 @@ endif
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LIBRETRO_CFLAGS += $(INCFLAGS) $(INCFLAGS_PLATFORM)
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LIBRETRO_CFLAGS += $(BPP_DEFINES) \
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$(ENDIANNESS_DEFINES) \
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$(PLATFORM_DEFINES) \
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-D__LIBRETRO__
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$(ENDIANNESS_DEFINES) \
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$(PLATFORM_DEFINES) \
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-D__LIBRETRO__ \
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-DM68K_ALLOW_OVERCLOCK \
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-DZ80_ALLOW_OVERCLOCK
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ifneq (,$(findstring msvc,$(platform)))
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LIBRETRO_CFLAGS += -DINLINE="static _inline"
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@ -268,6 +268,10 @@ typedef struct
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uint address_space; /* Current FC code */
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#ifdef M68K_ALLOW_OVERCLOCK
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uint8 overclock_ratio;
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#endif
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/* Callbacks to host */
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int (*int_ack_callback)(int int_line); /* Interrupt Acknowledge */
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void (*reset_instr_callback)(void); /* Called when a RESET instruction is encountered */
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@ -319,6 +319,10 @@ void m68k_init(void)
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}
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#endif
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#ifdef M68K_ALLOW_OVERCLOCK
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m68k.overclock_ratio = 1;
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#endif
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#if M68K_EMULATE_INT_ACK == OPT_ON
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m68k_set_int_ack_callback(NULL);
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#endif
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@ -514,7 +514,11 @@
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/* ---------------------------- Cycle Counting ---------------------------- */
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#ifdef M68K_ALLOW_OVERCLOCK
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#define USE_CYCLES(A) m68ki_cpu.cycles += (A) / m68ki_cpu.overclock_ratio
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#else
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#define USE_CYCLES(A) m68ki_cpu.cycles += (A)
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#endif
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#define SET_CYCLES(A) m68ki_cpu.cycles = (A)
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@ -284,6 +284,10 @@ void s68k_init(void)
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}
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#endif
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#ifdef M68K_ALLOW_OVERCLOCK
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s68k.overclock_ratio = 1;
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#endif
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#if M68K_EMULATE_INT_ACK == OPT_ON
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s68k_set_int_ack_callback(NULL);
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#endif
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@ -201,8 +201,18 @@
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#define IFF2 Z80.iff2
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#define HALT Z80.halt
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#ifdef Z80_ALLOW_OVERCLOCK
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#define USE_CYCLES(A) Z80.cycles += (A) / z80_overclock_ratio
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#else
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#define USE_CYCLES(A) Z80.cycles += (A)
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#endif
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Z80_Regs Z80;
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#ifdef Z80_ALLOW_OVERCLOCK
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UINT8 z80_overclock_ratio;
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#endif
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unsigned char *z80_readmap[64];
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unsigned char *z80_writemap[64];
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@ -473,7 +483,7 @@ INLINE void BURNODD(int cycles, int opcodes, int cyclesum)
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if( cycles > 0 )
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{
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R += (cycles / cyclesum) * opcodes;
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Z80.cycles += (cycles / cyclesum) * cyclesum * 15;
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USE_CYCLES((cycles / cyclesum) * cyclesum * 15);
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}
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}
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@ -485,7 +495,7 @@ INLINE void BURNODD(int cycles, int opcodes, int cyclesum)
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/***************************************************************
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* adjust cycle count by n T-states
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***************************************************************/
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#define CC(prefix,opcode) Z80.cycles += cc[Z80_TABLE_##prefix][opcode]
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#define CC(prefix,opcode) USE_CYCLES(cc[Z80_TABLE_##prefix][opcode])
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/***************************************************************
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* execute an opcode
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@ -3228,7 +3238,7 @@ static void take_interrupt(void)
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PUSH( pc );
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PCD = 0x0038;
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/* RST $38 + 'interrupt latency' cycles */
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Z80.cycles += cc[Z80_TABLE_op][0xff] + cc[Z80_TABLE_ex][0xff];
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USE_CYCLES(cc[Z80_TABLE_op][0xff] + cc[Z80_TABLE_ex][0xff]);
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}
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else
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{
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@ -3243,7 +3253,7 @@ static void take_interrupt(void)
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RM16( irq_vector, &Z80.pc );
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LOG(("Z80 #%d IM2 [$%04x] = $%04x\n",cpu_getactivecpu() , irq_vector, PCD));
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/* CALL $xxxx + 'interrupt latency' cycles */
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Z80.cycles += cc[Z80_TABLE_op][0xcd] + cc[Z80_TABLE_ex][0xff];
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USE_CYCLES(cc[Z80_TABLE_op][0xcd] + cc[Z80_TABLE_ex][0xff]);
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}
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else
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{
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@ -3257,18 +3267,18 @@ static void take_interrupt(void)
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PUSH( pc );
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PCD = irq_vector & 0xffff;
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/* CALL $xxxx + 'interrupt latency' cycles */
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Z80.cycles += cc[Z80_TABLE_op][0xcd] + cc[Z80_TABLE_ex][0xff];
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USE_CYCLES(cc[Z80_TABLE_op][0xcd] + cc[Z80_TABLE_ex][0xff]);
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break;
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case 0xc30000: /* jump */
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PCD = irq_vector & 0xffff;
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/* JP $xxxx + 2 cycles */
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Z80.cycles += cc[Z80_TABLE_op][0xc3] + cc[Z80_TABLE_ex][0xff];
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USE_CYCLES(cc[Z80_TABLE_op][0xc3] + cc[Z80_TABLE_ex][0xff]);
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break;
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default: /* rst (or other opcodes?) */
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PUSH( pc );
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PCD = irq_vector & 0x0038;
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/* RST $xx + 2 cycles */
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Z80.cycles += cc[Z80_TABLE_op][0xff] + cc[Z80_TABLE_ex][0xff];
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USE_CYCLES(cc[Z80_TABLE_op][0xff] + cc[Z80_TABLE_ex][0xff]);
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break;
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}
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}
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@ -3358,6 +3368,9 @@ void z80_init(const void *config, int (*irqcallback)(int))
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memset(&Z80, 0, sizeof(Z80));
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Z80.daisy = config;
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Z80.irq_callback = irqcallback;
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#ifdef Z80_ALLOW_OVERCLOCK
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z80_overclock_ratio = 1;
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#endif
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/* Clear registers values (NB: should be random on real hardware ?) */
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AF = BC = DE = HL = SP = IX = IY =0;
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@ -3449,7 +3462,7 @@ void z80_set_nmi_line(unsigned int state)
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PCD = 0x0066;
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WZ=PCD;
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Z80.cycles += 11*15;
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USE_CYCLES(11*15);
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}
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Z80.nmi_state = state;
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@ -51,6 +51,10 @@ typedef struct
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extern Z80_Regs Z80;
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#ifdef Z80_ALLOW_OVERCLOCK
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extern UINT8 z80_overclock_ratio;
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#endif
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extern unsigned char *z80_readmap[64];
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extern unsigned char *z80_writemap[64];
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@ -54,6 +54,12 @@
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#include <xtl.h>
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#endif
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#if defined(M68K_ALLOW_OVERCLOCK) || defined(Z80_ALLOW_OVERCLOCK)
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#define HAVE_OVERCLOCK
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/* Overclocking frame delay (hack) */
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#define OVERCLOCK_FRAME_DELAY 100
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#endif
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#define RETRO_DEVICE_MDPAD_3B RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 0)
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#define RETRO_DEVICE_MDPAD_6B RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 1)
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#define RETRO_DEVICE_MSPAD_2B RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 2)
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@ -150,6 +156,14 @@ static char ggvalidchars[] = "ABCDEFGHJKLMNPRSTVWXYZ0123456789";
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static char arvalidchars[] = "0123456789ABCDEF";
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/* Some games appear to calibrate music playback speed for PAL/NTSC by
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actually counting CPU cycles per frame during startup, resulting in
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hilariously fast music. Delay overclocking for a while as a
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workaround */
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#ifdef HAVE_OVERCLOCK
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static uint32_t overclock_delay;
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#endif
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#define SOUND_FREQUENCY 44100
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/* Hide the EQ settings for now */
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@ -526,6 +540,9 @@ static void config_default(void)
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config.bios = 0;
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config.lock_on = 0;
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config.lcd = 0; /* 0.8 fixed point */
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#ifdef HAVE_OVERCLOCK
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config.overclock = 0;
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#endif
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/* video options */
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config.overscan = 0;
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@ -1249,8 +1266,22 @@ static void check_variables(void)
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config.invert_mouse = 1;
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}
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#ifdef HAVE_OVERCLOCK
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var.key = "genesis_plus_gx_overclock";
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environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var);
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{
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if (strcmp(var.value, "1x") == 0)
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config.overclock = 0;
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else if (strcmp(var.value, "2x") == 0)
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config.overclock = 1;
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}
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#endif
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if (reinit)
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{
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#ifdef HAVE_OVERCLOCK
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overclock_delay = OVERCLOCK_FRAME_DELAY;
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#endif
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audio_init(SOUND_FREQUENCY, 0);
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memcpy(temp, sram.sram, sizeof(temp));
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system_init();
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@ -1690,6 +1721,9 @@ void retro_set_environment(retro_environment_t cb)
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{ "genesis_plus_gx_render", "Interlaced mode 2 output; single field|double field" },
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{ "genesis_plus_gx_gun_cursor", "Show Lightgun crosshair; disabled|enabled" },
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{ "genesis_plus_gx_invert_mouse", "Invert Mouse Y-axis; disabled|enabled" },
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#ifdef HAVE_OVERCLOCK
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{ "genesis_plus_gx_overclock", "Overclock CPU; 1x|2x" },
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#endif
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{ NULL, NULL },
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};
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@ -2033,6 +2067,10 @@ bool retro_unserialize(const void *data, size_t size)
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if (!state_load((uint8_t*)data))
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return FALSE;
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#ifdef HAVE_OVERCLOCK
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overclock_delay = OVERCLOCK_FRAME_DELAY;
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#endif
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return TRUE;
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}
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@ -2197,6 +2235,9 @@ bool retro_load_game(const struct retro_game_info *info)
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}
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}
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#ifdef HAVE_OVERCLOCK
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overclock_delay = OVERCLOCK_FRAME_DELAY;
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#endif
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audio_init(SOUND_FREQUENCY, 0);
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system_init();
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system_reset();
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@ -2312,6 +2353,9 @@ void retro_deinit(void)
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void retro_reset(void)
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{
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#ifdef HAVE_OVERCLOCK
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overclock_delay = OVERCLOCK_FRAME_DELAY;
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#endif
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gen_reset(0);
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}
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@ -2320,12 +2364,42 @@ void retro_run(void)
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bool updated = false;
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is_running = true;
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#ifdef HAVE_OVERCLOCK
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/* update overclock delay */
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if (overclock_delay)
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overclock_delay--;
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#endif
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if (system_hw == SYSTEM_MCD)
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{
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#ifdef M68K_ALLOW_OVERCLOCK
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if (config.overclock && overclock_delay == 0)
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m68k.overclock_ratio = 2;
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else
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m68k.overclock_ratio = 1;
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#endif
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system_frame_scd(0);
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}
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else if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
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{
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#ifdef M68K_ALLOW_OVERCLOCK
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if (config.overclock && overclock_delay == 0)
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m68k.overclock_ratio = 2;
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else
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m68k.overclock_ratio = 1;
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#endif
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system_frame_gen(0);
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}
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else
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{
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#ifdef Z80_ALLOW_OVERCLOCK
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if (config.overclock && overclock_delay == 0)
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z80_overclock_ratio = 2;
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else
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z80_overclock_ratio = 1;
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#endif
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system_frame_sms(0);
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}
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if (bitmap.viewport.changed & 9)
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{
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@ -120,6 +120,7 @@ struct
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t_input_config input[MAX_INPUTS];
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uint8 invert_mouse;
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uint8 gun_cursor;
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uint8 overclock;
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} config;
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extern char GG_ROM[256];
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