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STATIC_LINKING := 0
AR := ar
CC := g++
ifeq ($(platform),)
platform = unix
ifeq ($(shell uname -a),)
platform = win
else ifneq ($(findstring MINGW,$(shell uname -a)),)
platform = win
else ifneq ($(findstring Darwin,$(shell uname -a)),)
platform = osx
else ifneq ($(findstring win,$(shell uname -a)),)
platform = win
endif
endif
# system platform
system_platform = unix
ifeq ($(shell uname -a),)
EXE_EXT = .exe
system_platform = win
else ifneq ($(findstring Darwin,$(shell uname -a)),)
system_platform = osx
arch = intel
ifeq ($(shell uname -p),powerpc)
arch = ppc
endif
else ifneq ($(findstring MINGW,$(shell uname -a)),)
system_platform = win
endif
TARGET_NAME := vemulator
LIBM = -lm
ifeq ($(ARCHFLAGS),)
ifeq ($(archs),ppc)
ARCHFLAGS = -arch ppc -arch ppc64
else
ARCHFLAGS = -arch i386 -arch x86_64
endif
endif
ifeq ($(platform), osx)
ifndef ($(NOUNIVERSAL))
CFLAGS += $(ARCHFLAGS)
LFLAGS += $(ARCHFLAGS)
endif
endif
ifeq ($(STATIC_LINKING), 1)
EXT := a
endif
ifeq ($(platform), unix)
EXT ?= so
TARGET := $(TARGET_NAME)_libretro.$(EXT)
fpic := -fPIC
SHARED := -shared -Wl,--version-script=link.T -Wl,--no-undefined
else ifeq ($(platform), linux-portable)
TARGET := $(TARGET_NAME)_libretro.$(EXT)
fpic := -fPIC -nostdlib
SHARED := -shared -Wl,--version-script=link.T
LIBM :=
else ifneq (,$(findstring osx,$(platform)))
TARGET := $(TARGET_NAME)_libretro.dylib
fpic := -fPIC
SHARED := -dynamiclib
else ifneq (,$(findstring ios,$(platform)))
TARGET := $(TARGET_NAME)_libretro_ios.dylib
fpic := -fPIC
SHARED := -dynamiclib
ifeq ($(IOSSDK),)
IOSSDK := $(shell xcodebuild -version -sdk iphoneos Path)
endif
DEFINES := -DIOS
CC = CC -arch armv7 -isysroot $(IOSSDK)
ifeq ($(platform),ios9)
CC += -miphoneos-version-min=8.0
CFLAGS += -miphoneos-version-min=8.0
else
CC += -miphoneos-version-min=5.0
CFLAGS += -miphoneos-version-min=5.0
endif
else ifneq (,$(findstring qnx,$(platform)))
TARGET := $(TARGET_NAME)_libretro_qnx.so
fpic := -fPIC
SHARED := -shared -Wl,--version-script=link.T -Wl,--no-undefined
else ifeq ($(platform), emscripten)
TARGET := $(TARGET_NAME)_libretro_emscripten.bc
fpic := -fPIC
SHARED := -shared -Wl,--version-script=link.T -Wl,--no-undefined
else ifeq ($(platform), vita)
TARGET := $(TARGET_NAME)_vita.a
CC = arm-vita-eabi-g++
AR = arm-vita-eabi-ar
CFLAGS += -Wl,-q -Wall -O3
STATIC_LINKING = 1
else
CC = g++
TARGET := $(TARGET_NAME)_libretro.dll
SHARED := -shared -static-libgcc -static-libstdc++ -s -Wl,--version-script=link.T -Wl,--no-undefined
endif
LDFLAGS += $(LIBM)
ifeq ($(DEBUG), 1)
CFLAGS += -O0 -g
else
CFLAGS += -O3
endif
OBJECTS := *.cpp
CFLAGS += -Wall -pedantic $(fpic)
ifneq (,$(findstring qnx,$(platform)))
CFLAGS += -Wc,-std=c++99
else
CFLAGS += -std=gnu++99
endif
all: $(TARGET)
$(TARGET): $(OBJECTS)
ifeq ($(STATIC_LINKING), 1)
$(AR) rcs $@ $(OBJECTS)
else
$(CC) $(fpic) $(SHARED) $(INCLUDES) -o $@ $(OBJECTS) $(LDFLAGS)
endif
%.o: %.cpp
$(CC) $(CFLAGS) $(fpic) -c -o $@ $<
clean:
rm -f *.so *.o
.PHONY: clean

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "audio.h"
VE_VMS_AUDIO::VE_VMS_AUDIO(VE_VMS_CPU *_cpu, VE_VMS_RAM *_ram)
{
T1LR_reg = 0;
T1LC_reg = 128;
IsEnabled = false;
T1LR_old = -1;
ram = _ram;
cpu = _cpu;
sampleArray = (int16_t *)calloc(2*SAMPLE_RATE, sizeof(int16_t)); //Multiplied by 2 because 2 channels
frequency = 146539.3;
}
VE_VMS_AUDIO::~VE_VMS_AUDIO()
{
free(sampleArray);
}
void VE_VMS_AUDIO::generateSignal(retro_audio_sample_t &audio_cb)
{
if(!IsEnabled)
{
audio_cb(0, 0);
return;
}
double T1LC_reg_D = T1LC_reg;
double T1LR_reg_D = T1LR_reg;
//1 second is equal to 32768 samples
int16_t waveWidth = (int16_t) ((256 - T1LR_reg_D) * (SAMPLE_RATE / frequency)); //1 Wave (In samples not seconds)
double lowLevelWidth = abs((((T1LC_reg_D - T1LR_reg_D)/(256 - T1LR_reg_D)) * waveWidth));
//lowLevelWidth = 0.5 * waveWidth; //Many mini-games don't care about T1LD, 0.5 would play a sound close to the original.
for(int i = 0; i < SAMPLE_RATE / FPS; i++)
{
int16_t amplitude = 0x7FFF;
if(waveWidth != 0)
{
if((i%waveWidth) < lowLevelWidth) amplitude = 0;
}
audio_cb(amplitude, amplitude);
}
}
void VE_VMS_AUDIO::setAudioFrequency(double f)
{
frequency = f;
}
void VE_VMS_AUDIO::setT1(int b)
{
T1LR_reg = b & 0xFF;
}
void VE_VMS_AUDIO::setT1C(int b)
{
T1LC_reg = b & 0xFF;
}
void VE_VMS_AUDIO::setEnabled(bool e)
{
IsEnabled = e;
}
void VE_VMS_AUDIO::runAudioCheck()
{
if(!IsEnabled)
{
size_t count = SAMPLE_RATE * 2;
//Empty signal (No sound)
for(size_t i = 0; i < count; i++)
sampleArray[i] = 0;
T1LR_old = -1;
}
else if(T1LR_old != T1LR_reg)
//generateSignal();
T1LR_old = T1LR_reg;
}
int16_t *VE_VMS_AUDIO::getSignal()
{
return sampleArray;
}

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef _AUDIO_H_
#define _AUDIO_H_
#include <math.h>
#include "libretro.h"
#include "common.h"
#include "cpu.h"
#include "ram.h"
class VE_VMS_AUDIO
{
public:
VE_VMS_AUDIO(VE_VMS_CPU *_cpu, VE_VMS_RAM *_ram);
~VE_VMS_AUDIO();
void generateSignal(retro_audio_sample_t &audio_cb);
void setAudioFrequency(double f);
void setT1(int b);
void setT1C(int b);
void setEnabled(bool e);
void runAudioCheck();
int16_t *getSignal();
private:
int T1LR_reg;
int T1LC_reg;
bool IsEnabled;
int T1LR_old;
double frequency; //This is supposed to be the CPU's frequency, but we have made the CPU's clock fixed
int16_t *sampleArray;
VE_VMS_CPU *cpu;
VE_VMS_RAM *ram;
};
#endif // _AUDIO_H_

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "basetimer.h"
VE_VMS_BASETIMER::VE_VMS_BASETIMER(VE_VMS_RAM *_ram, VE_VMS_INTERRUPTS *_intHandler, VE_VMS_CPU *_cpu)
{
ram = _ram;
intHandler = _intHandler;
cpu = _cpu;
BTR = 0;
}
VE_VMS_BASETIMER::~VE_VMS_BASETIMER()
{
}
void VE_VMS_BASETIMER::runTimer()
{
int BTCR_data = ram->readByte_RAW(BTCR);
bool BTStarted = (BTCR_data & 64) != 0;
bool Int0Enabled = (BTCR_data & 1) != 0;
bool Int1Enabled = (BTCR_data & 4) != 0;
int int1cycle;
int cycleControl = ((BTCR_data & 16) >> 4) | ((BTCR_data & 32) >> 4);
switch (cycleControl)
{
case 0:
int1cycle = 32;
break;
case 1:
int1cycle = 128;
break;
case 2:
int1cycle = 512;
break;
case 3:
int1cycle = 2048;
break;
default:
int1cycle = 2048;
}
if(BTStarted)
{
BTR += 32786.0 / cpu->getCurrentFrequency();
//Throw interrupt 1 source when cycle chosen is reached
if(BTR >= int1cycle)
{
BTCR_data |= 8;
ram->writeByte_RAW(BTCR, BTCR_data);
if (Int1Enabled)
intHandler->setINT3();
}
if((BTR > 16383) || (BTR > 63 && ((BTCR_data & 128) != 0)))
{
//Throw full (14-bit) overflow interrupt (Interrupt 0 source)
BTCR_data |= 2;
ram->writeByte_RAW(BTCR, BTCR_data);
if(Int0Enabled)
intHandler->setINT3();
if(BTR > 16383) BTR = 0;
}
}
}

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef _BASETIMER_H_
#define _BASETIMER_H_
#include "ram.h"
#include "interrupts.h"
#include "cpu.h"
class VE_VMS_BASETIMER
{
public:
VE_VMS_BASETIMER(VE_VMS_RAM *_ram, VE_VMS_INTERRUPTS *_intHandler, VE_VMS_CPU *_cpu);
~VE_VMS_BASETIMER();
void runTimer();
private:
double BTR; //14-bit
VE_VMS_RAM *ram;
VE_VMS_INTERRUPTS *intHandler;
VE_VMS_CPU *cpu;
};
#endif // _BASETIMER_H_

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "bitwisemath.h"
//Flags [0|0|0|0|0|O|A|C/B]
//This is an 8-bit adder. Returns sum as first in array, then flags.
void add8(byte i1, byte i2, byte carry, byte *result)
{
byte op1 = i1 & 0xFF;
byte op2 = i2 & 0xFF;
byte s = 0; //8-bits
byte c = carry; //Assume its 1-bit
byte flags = 0;
byte c6 = 0;
byte c7 = 0;
//Start operation
for(byte i = 0; i < 8; ++i)
{
//Take next bit
byte bit1 = ((op1 & ((1 << i) & 0xFF)) >> i) & 0xFF;
byte bit2 = ((op2 & ((1 << i) & 0xFF)) >> i) & 0xFF;
//Sum them together
byte z1 = (bit1 ^ bit2) & 0xFF;
s |= ((c ^ z1) << i) & 0xFF;
//Calculate carry
byte c1 = (c & z1) & 0xFF;
byte c2 = (bit1 & bit2) & 0xFF;
c = (c1 | c2) & 0xFF;
//Auxiliary flag set
if(c != 0 && i == 3)
flags |= 0x2;
if(i == 6) c6 = c & 1;
else if(i == 7) c7 = c & 1;
}
c &= 1;
//Check carry
if(c == 1)
flags |= 0x1;
//Check overflow
if(c6 != c7)
flags |= 0x4;
result[0] = s & 0xFF;
result[1] = flags & 0xFF;
}
void sub8(byte i1, byte i2, byte carry, byte *result)
{
byte op1 = i1 & 0xFF;
byte op2 = i2 & 0xFF;
op2 ^= 0xFF; //2's Complement
op2 &= 0xFF;
byte s = 0; //8-bits
byte c = carry ^ 0xFF; //Assume its 1-bit
c &= 1;
byte flags = 0;
byte c6 = 0;
byte c7 = 0;
//Start operation
for(byte i = 0; i < 8; ++i)
{
//Take next bit
byte bit1 = ((op1 & ((1 << i) & 0xFF)) >> i) & 0xFF;
byte bit2 = ((op2 & ((1 << i) & 0xFF)) >> i) & 0xFF;
//Sum them together
byte z1 = (bit1 ^ bit2) & 0xFF;
s |= ((c ^ z1) << i) & 0xFF;
//Calculate carry
byte c1 = (c & z1) & 0xFF;
byte c2 = (bit1 & bit2) & 0xFF;
c = (c1 | c2) & 0xFF;
//Auxiliary flag set
if(c == 0 && i == 3)
flags |= 0x2;
if(i == 6) c6 = c & 1;
else if(i == 7) c7 = c & 1;
}
c ^= 0xFF;
c &= 1;
//Check carry
if(c == 1)
flags |= 0x1;
//Check overflow
if(c6 != c7)
flags |= 0x4;
result[0] = s & 0xFF;
result[1] = flags & 0xFF;
}
//This is an 8-bit subtractor (op1 - op2). Returns difference as first in array, then flags.
void sub8_old(byte i1, byte i2, byte *result)
{
byte op1 = i1 & 0xFF;
byte op2 = i2 & 0xFF;
byte d = 0; //8-bits
byte b = 0; //Assume its 1-bit
byte flags = 0;
//Those following two will be used to calculate overflow flag later
byte MSB1 = (op1 & 0x80) & 0xFF; //No need to shift them, since all of them are in the same place
byte MSB2 = (op2 & 0x80) & 0xFF;
for(byte i = 0; i < 8; ++i)
{
//Take next bit
byte bit1 = ((op1 & ((1 << i) & 0xFF)) >> i) & 0xFF;
byte bit2 = ((op2 & ((1 << i) & 0xFF)) >> i) & 0xFF;
//Sub them from each other
byte z1 = (bit1 ^ bit2) & 0xFF;
d |= ((b ^ z1) << i) & 0xFF;
//Calculate borrow
byte bit1_neg = (~bit1) & 0xF; //Invert the bit (Only the bit)
byte z1_neg = (~z1) & 0xF;
byte b1 = (z1_neg & b) & 0xFF;
byte b2 = (bit1_neg & bit2) & 0xFF;
b = (b1 | b2) & 0xFF;
//Auxiliary flag set
if(b != 0 && i == 1)
flags |= 0x2;
}
//Check carry flag
if(b == 1)
flags |= 0x1;
//Check overflow
byte resultMSB = (d & 0x80) & 0xFF;
if((MSB1 == MSB2) && MSB1 != resultMSB)
flags |= 0x4;
result[0] = d & 0xFF;
result[1] = flags & 0xFF;
}
//Take complement
byte comp8(byte op)
{
return (((~op) & 0xFF) + 1) & 0xFF;
}
//Convert to signed
byte toSigned8(byte op)
{
if(op < -127)
return comp8(op);
else return op;
}
//Converts normal number to BCD
//https://stackoverflow.com/questions/13247647/convert-integer-from-pure-binary-to-bcd
int int2BCD(int dec)
{
int i = dec;
int bcd = 0;
int j = 0;
for(; i > 0; i /= 10, j++)
bcd |= (i % 10) << (j << 2);
return bcd;
}

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef _BITWISEMATH_H_
#define _BITWISEMATH_H_
#include "common.h"
//These functions perform low-level bitwise operations.
//Flags [0|0|0|0|0|O|A|C/B]
///This is an 8-bit adder. Returns sum as first in array, then flags.
void add8(byte i1, byte i2, byte carry, byte *result);
void sub8(byte i1, byte i2, byte carry, byte *result);
///This is an 8-bit subtractor (op1 - op2). Returns difference as first in array, then flags.
void sub8_old(byte i1, byte i2, byte *result);
//Take complement
byte comp8(byte op);
//Convert to signed
byte toSigned8(byte op);
///Converts normal number byteo BCD
int int2BCD(int dec);
#endif // _BITWISEMATH_H_

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef _COMMON_H_
#define _COMMON_H_
#include <stdlib.h>
#include <inttypes.h>
#include <stdio.h>
#define FPS 60
#define SAMPLE_RATE 32768
#define SCREEN_WIDTH 48
#define SCREEN_HEIGHT 32
typedef unsigned char byte;
#endif // _COMMON_H_

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef _CPU_H_
#define _CPU_H_
#include <vector>
#include "ram.h"
#include "rom.h"
#include "flash.h"
#include "interrupts.h"
#include "bitwisemath.h"
class VE_VMS_CPU
{
public:
int state; //0: stopped. 1: started.
int EXTOld;
int EXTNew;
bool P3_taken;
VE_VMS_CPU(VE_VMS_RAM *_ram, VE_VMS_ROM *_rom, VE_VMS_FLASH *_flash, VE_VMS_INTERRUPTS *_intHandler, bool hle);
~VE_VMS_CPU();
double getCurrentFrequency();
void setFrequency(double f);
//Memory operations
//Reads a byte either from ROM or Flash, depending on value of EXT
byte readByteRF(size_t address);
//Writes a byte either from ROM or Flash, depending on value of EXT
void writeByteRF(size_t address, byte d);
//Read
byte *readFromROM(size_t address, size_t byteCount);
byte *readFromRAM(size_t address, size_t byteCount);
//Write
void writeToROM(byte *data, size_t dataSize, size_t address);
void writeToRAM(byte *data, size_t dataSize, size_t address);
//Address/Data functions
//Immediate
byte getAddress_i8();
//Relative 8-bit (signed)
signed char getAddress_r8();
//Relative 8-bit when the opcode has bit specifiers (signed)
signed char getAddress_r8_b3();
//Relative 16-bit
size_t getAddress_r16();
//Direct 9-bit
size_t getAddress_d9();
//Direct 9-bit with bit assignment
size_t getAddress_d9_b3();
//Get bits (b3)
byte getAddress_b3();
//Indirect
size_t getAddress_R();
//Absolute 12-bit
size_t getAddress_a12();
//Absolute 16-bit
size_t getAddress_a16();
//Absolute 16-bit (But can select to get operand from ROM (EXT = 0) or Flash (EXT = 1), important for when an instruction changes EXT, it will always be followed by a JMPF)
size_t getAddress_a16(byte _EXT);
//FLAG operations
void FLAG_setP();
void FLAG_clearP();
byte FLAG_getP();
void FLAG_setOV();
void FLAG_clearOV();
byte FLAG_getOV();
void FLAG_setAC();
void FLAG_clearAC();
byte FLAG_getAC();
void FLAG_setCY();
void FLAG_clearCY();
byte FLAG_getCY();
/******************************************************
******************************************************
* Instructions and interrupts
******************************************************
******************************************************/
void processInterrupts();
void performHLE(size_t entryAddress);
//Interpreter
int processInstruction(bool dbg);
private:
size_t PC; //This counts where we reached in instruction memory (Starting from first instruction executed)
int clock; //In nanoseconds
double frequency;
int interruptLevel;
int currentInterrupt;
bool interruptsMasked = false;
int instructionCount = 0;
VE_VMS_RAM *ram;
VE_VMS_ROM *rom;
VE_VMS_FLASH *flash;
VE_VMS_INTERRUPTS *intHandler;
std::vector<int> interruptQueue;
bool IsHLE;
};
#endif // _CPU_H_

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "flash.h"
VE_VMS_FLASH::VE_VMS_FLASH(VE_VMS_RAM *_ram)
{
userData = new byte[0x19000];
directory = new byte[0x1A00];
FAT = new byte[0x200];
rootBlock = new byte[0x200];
data = new byte[0x20000];
IsRealFlash = true;
IsSaveEnabled = true;
ram = _ram;
}
VE_VMS_FLASH::~VE_VMS_FLASH()
{
if(flashWriter != NULL)
fclose(flashWriter);
}
///Loads raw VMS data to be easily accessed.
//romType 0: Memory Dump (.bin)
//romType 1: VMS file
//romType 2: DCI file
void VE_VMS_FLASH::loadROM(byte *d, size_t buffSize, int romType, const char *fileName, bool enableSave)
{
byte *romData = new byte[0x20000];
size_t romSize = buffSize;
if(romType == 2) romSize -= 32;
if(romType == 2)
{
for(size_t i = 32, i2 = 0; i < romSize; i += 4, i2 += 4)
{
for(int j = 3, k = 0; j >= 0; j--, k++)
romData[i2 + k] = d[i + j] & 0xFF;
}
}
else
{
for (size_t i = 0; i < romSize; i++)
romData[i] = d[i] & 0xFF;
}
//If VMS or DCI, create a bogus flash memory to contain it in.
if(romType == 1 || romType == 2)
{
IsRealFlash = false;
int rootPtr = 255*512;
int FATPtr = 254*512;
int dirPtr = 253*512;
int sz = (romSize+511) >> 9;
int i = 0;
//FAT init
for(; i < 256*2; i += 2)
{
romData[FATPtr + i] = 0xFC;
romData[FATPtr + i + 1] = 0xFF;
}
for(i = 0; i < sz; i++)
{
romData[FATPtr + 2*i] = i+1;
romData[FATPtr + (2*i)+1] = 0;
}
if((--i) >= 0)
{
romData[FATPtr + 2*i] = 0xFA;
romData[FATPtr + (2*i)+1] = 0xFF;
}
romData[FATPtr + 254*2] = 0xFA;
romData[FATPtr + (254*2)+1] = 0xFF;
romData[FATPtr + 255*2] = 0xFA;
romData[FATPtr + (255*2)+1] = 0xFF;
for(i = 253; i > 241; --i)
{
romData[FATPtr + 2*i] = i-1;
romData[FATPtr + (2*i)+1] = 0;
}
romData[FATPtr + 241*2] = 0xFA;
romData[FATPtr + (241*2) + 1] = 0xFA;
//Dir init
romData[dirPtr] = 0xCC;
//Fill bogus name (Spaces)
for(i = 4; i < 12; i++)
romData[dirPtr + i] = ' ';
romData[dirPtr + 0x18] = sz & 0xFF;
romData[dirPtr + 0x19] = sz >> 8;
romData[dirPtr + 0x1A] = 1;
for(i = 0; i < 16; i++)
romData[rootPtr + i] = 0x55;
romData[rootPtr + 0x10] = 1;
for(i = 0; i < 8; i++)
romData[rootPtr + 0x30 + i] = romData[dirPtr+0x10 + i];
romData[rootPtr+ 0x44] = 255;
romData[rootPtr + 0x46] = 254;
romData[rootPtr + 0x48] = 1;
romData[rootPtr + 0x4A] = 253;
romData[rootPtr + 0x4C] = 13;
romData[rootPtr + 0x50] = 200;
}
if(romType == 0)
{
//Loading userData (200 blocks, blocks are ordered descending)
for (int i = 0, c = 0; i < 200; ++i)
{
for (int j = 0; j < 512; j++) {
userData[c] = romData[(i * 512) + j];
c++;
}
}
//Loading directory (13 blocks)
for (int i = 253, c = 0; i >= 241; --i)
{
for (int j = 0; j < 512; j++) {
directory[c] = romData[(i * 512) + j];
c++;
}
}
//Loading FAT and rootBlock
for (int j = 0; j < 512; j++)
FAT[j] = romData[(0x1FC00) + j]; //0x1FC00 being 254 x 512
for (int j = 0; j < 512; j++)
rootBlock[j] = romData[(0x1FE00) + j]; //0x1FE00 being 255 x 512
}
//We also need data as a whole
for(size_t j = 0; j < romSize; j++)
data[j] = romData[j];
IsSaveEnabled = enableSave;
if(IsSaveEnabled && romType == 0)
flashWriter = fopen(fileName, "r+b");
}
///Returns raw VMS data and its size
size_t VE_VMS_FLASH::getROM(byte *out)
{
//Loading userData (200 blocks, blocks are ordered descending)
for(int i = 0, c = 0; i < 200; ++i)
{
for(int j = 0; j < 512; j++){
out[(i*512) + j] = userData[c];
c++;
}
}
//Loading directory (13 blocks)
for(int i = 253, c = 0; i >= 241; --i)
{
for(int j = 0; j < 512; j++){
out[(i*512) + j] = directory[c];
c++;
}
}
//Loading FAT and rootBlock
for(int j = 0; j < 512; j++)
{
out[(0x1FC00) + j] = FAT[j]; //0x1FC00 being 254 x 512
// for(int j = 0; j < 512; j++)
out[(0x1FE00) + j] = rootBlock[j]; //0x1FE00 being 255 x 512
}
}
///Returns data
size_t VE_VMS_FLASH::getData(byte *out)
{
for(size_t i = 0; i < 0x20000; ++i, out[i] = data[i]);
return 0x20000;
}
//Operations
///Returns byte at address. (No banking)
byte VE_VMS_FLASH::getByte(size_t address)
{
/*if(address < 0x19000)
return userData[address] & 0xFF;
else if(address >= 0x19000 && address < 0x1E200)
return 0; //This area of ROM is not used, why request it?
else if(address >= 0x1E200 && address < 0x1FC00)
return directory[address - 0x1E200] & 0xFF;
else if(address >= 0x1FC00 && address < 0x1FE00)
return FAT[address - 0x1FC00] & 0xFF;
else if(address >= 0x1FE00 && address < 0x20000)
return rootBlock[address - 0x1FE00] & 0xFF;
else return 0;*/
return data[address] & 0xFF;
}
///Returns byte at address (With banking)
byte VE_VMS_FLASH::readByte(size_t address)
{
if((ram->readByte(0x154) & 1) == 1) address += 0x10000;
return data[address] & 0xFF;
}
//Returns int16 at address (Little-endian)
int VE_VMS_FLASH::getWord(size_t address)
{
int word = 0;
if(address < 0x19000)
{
word = (userData[address+1] << 16) | (userData[address] & 0xFF);
return word;
}
else if(address >= 0x19000 && address < 0x1E200)
return 0; //This area of ROM is not used, why request it?
else if(address >= 0x1E200 && address < 0x1FC00)
{
word = (directory[address - 0x1E200 + 1] << 16) | (directory[address - 0x1E200] & 0xFF);
return word;
}
else if(address >= 0x1FC00 && address < 0x1FE00)
{
word = (FAT[address - 0x1FC00 + 1] << 16) | (FAT[address - 0x1FC00] & 0xFF);
return word;
}
else if(address >= 0x1FE00 && address < 0x20000)
{
word = (rootBlock[address - 0x1FE00 + 1] << 16) | (rootBlock[address - 0x1FE00] & 0xFF);
return word;
}
else return 0;
}
///Writes int to address
void VE_VMS_FLASH::writeByte(size_t address, byte d)
{
/*if(address < 0x19000)
userData[address] = (int)(d & 0xFF);
else if(address >= 0x19000 && address < 0x1E200)
return; //This area of ROM is not used, why request it?
else if(address >= 0x1E200 && address < 0x1FC00)
directory[address - 0x1E200] = (int)(d & 0xFF);
else if(address >= 0x1FC00 && address < 0x1FE00)
FAT[address - 0x1FC00] = (int)(d & 0xFF);
else if(address >= 0x1FE00 && address < 0x20000)
rootBlock[address - 0x1FE00] = (int)(d & 0xFF);*/
if((ram->readByte(0x154) & 2) != 0) return; //An EXT similar register but for Flash
if((ram->readByte(0x154) & 1) == 1) address += 0x10000;
data[address] = d & 0xFF;
//If playing a flashrom, save changes in real time
if(IsRealFlash && IsSaveEnabled)
{
fseek(flashWriter, address, SEEK_SET);
fputc(d, flashWriter);
}
}
//Writes int to raw address
void VE_VMS_FLASH::writeByte_RAW(size_t address, byte d)
{
data[address] = d & 0xFF;
//If playing a flashrom, save changes in real time
if(IsRealFlash && IsSaveEnabled)
{
fseek(flashWriter, address, SEEK_SET);
fputc(d, flashWriter);
}
}
///Writes int16 to address (Little-endian)
void VE_VMS_FLASH::writeWord(size_t address, byte d)
{
if(address < 0x19000)
{
userData[address] = (int)(d & 0xFF);
userData[address + 1] = (int)((d >> 16) & 0xFF);
}
else if(address >= 0x19000 && address < 0x1E200)
return; //This area of ROM is not used, why request it?
else if(address >= 0x1E200 && address < 0x1FC00)
{
directory[address - 0x1E200] = (int)(d & 0xFF);
directory[address - 0x1E200 + 1] = (int)((d >> 16) & 0xFF);
}
else if(address >= 0x1FC00 && address < 0x1FE00)
{
FAT[address - 0x1FC00] = (int)(d & 0xFF);
FAT[address - 0x1FC00 + 1] = (int)((d >> 16) & 0xFF);
}
else if(address >= 0x1FE00 && address < 0x20000)
{
rootBlock[address - 0x1FE00] = (int)(d & 0xFF);
rootBlock[address - 0x1FE00 + 1] = (int)((d >> 16) & 0xFF);
}
}
///Get block data (512)
void VE_VMS_FLASH::readBlock(int blockNumber, byte *out)
{
for(int j = 0; j < 512; j++)
out[j] = getByte((blockNumber * 512) + j);
}
///Write data to block (512)
void VE_VMS_FLASH::writeBlock(int blockNumber, byte *in)
{
for(int j = 0; j < 512; j++)
writeByte((blockNumber * 512 + j), in[j]);
}
///Checks if card is corrupt
bool VE_VMS_FLASH::IsCorrupt()
{
for(int i = 0; i < 0x0F; ++i)
if(rootBlock[i] != 0x55)
return true;
return false;
}
///Counts files in directory
int VE_VMS_FLASH::countFiles()
{
int count = 0;
//Read entries in dictionary (Each entry is 32-bytes long)
for(int i = 0x1E200; i < 0x1FC00; i += 32)
{
byte d = getByte(i);
//If first int in entry is not 0x00, it means that the file is either data or a game
if(d != 0x00)
++count;
}
return count;
}
//File operations
///Get file info from directory depending on its index
VE_VMS_FLASH_FILE VE_VMS_FLASH::getFileAt(int index)
{
int pos = index * 32; //Each entry is 32-bits
VMS_FILE_TYPE type = VE_VMS_FLASH_FILE::getType(directory[pos + 0]);
int startBlock = directory[pos + 1] | (directory[pos + 2] << 16);
byte *nameArray = new byte[12];
for(int i = 0; i < 12; ++i)
{
int c = directory[pos + 4 + i];
if((char)c == ' ') break;
nameArray[i] = (byte)c;
if(c == '\0') break;
}
char *fileName = (char *)malloc(12);
for(int i = 0; i < 12; i++, fileName[i] = nameArray[i]); //Filenames in VMS are UTF-8 encoded
int fileSize = directory[pos + 0x18] | (directory[pos + 0x19] << 16);
int fileHeader = directory[pos + 0x1A] | (directory[pos + 0x1B] << 16);
VE_VMS_FLASH_FILE file(index, type, startBlock, fileName, fileSize, fileHeader);
return file;
}
///Get file info from directory depending on its name
VE_VMS_FLASH_FILE VE_VMS_FLASH::getFile(const char *name){
VE_VMS_FLASH_FILE file;
int fileCount = countFiles();
for(int i = 0; i < fileCount; ++i)
{
file = getFileAt(i);
if(strcmp(file.getFileName(), name))
break;
}
return file;
}
///Counts number of mini-games found in ROM
int VE_VMS_FLASH::countGames()
{
int fileCount = countFiles();
int gameCount = 0;
for(int i = 0; i < fileCount; i++)
if(getFileAt(i).getType() == GAME)
gameCount++;
return gameCount;
}
//FAT operations
///Get data of file from FAT FS
size_t VE_VMS_FLASH::getFileData(VE_VMS_FLASH_FILE fileinfo, byte *out)
{
byte startBlock = fileinfo.getStartBlock();
byte blockCount = fileinfo.getFileSize();
out = new byte[blockCount * 512];
for(int i = startBlock * 2, e = startBlock, w = 0; i < 512; i+=2, e++)
{ //e is for entry
byte FATEntry = FAT[i] | (FAT[i+1] << 16); //Little-endian
if(FATEntry != 0xFFFC){
byte *block = new byte[512];
readBlock(e, block); //Block is allocated to our file
//Write read block to 'data'
for(int j = 0; j < 512; ++j)
data[(w * 512) + j] = block[j];
++w; //Indicates number of blocks written
if(FATEntry == 0xFFFA) break;
}
}
return blockCount * 512;
}

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef _FLASH_H_
#define _FLASH_H_
#include <stdio.h>
#include <string.h>
#include "common.h"
#include "flashfile.h"
#include "ram.h"
class VE_VMS_FLASH
{
public:
VE_VMS_FLASH(VE_VMS_RAM *_ram);
~VE_VMS_FLASH();
///Loads raw VMS data to be easily accessed.
//romType 0: Memory Dump (.bin)
//romType 1: VMS file
//romType 2: DCI file
void loadROM(byte *d, size_t buffSize, int romType, const char *fileName, bool enableSave);
///Returns raw VMS data and its size
size_t getROM(byte *out);
///Returns data
size_t getData(byte *out);
//Operations
///Returns byte at address. (No banking)
byte getByte(size_t address);
///Returns byte at address (With banking)
byte readByte(size_t address);
//Returns int16 at address (Little-endian)
int getWord(size_t address);
///Writes int to address
void writeByte(size_t address, byte d);
//Writes int to raw address
void writeByte_RAW(size_t address, byte d);
///Writes int16 to address (Little-endian)
void writeWord(size_t address, byte d);
///Get block data (512)
void readBlock(int blockNumber, byte *out);
///Write data to block (512)
void writeBlock(int blockNumber, byte *in);
///Checks if card is corrupt
bool IsCorrupt();
///Counts files in directory
int countFiles();
//File operations
///Get file info from directory depending on its index
VE_VMS_FLASH_FILE getFileAt(int index);
///Get file info from directory depending on its name
VE_VMS_FLASH_FILE getFile(const char *name);
///Counts number of mini-games found in ROM
int countGames();
//FAT operations
///Get data of file from FAT FS
size_t getFileData(VE_VMS_FLASH_FILE fileinfo, byte *out);
private:
//File structure
byte *userData;
byte *directory;
byte *FAT;
byte *rootBlock;
byte *data;
FILE *flashWriter;
char *romName;
bool IsRealFlash;
bool IsSaveEnabled;
VE_VMS_RAM *ram;
};
#endif // _FLASH_H_

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "flashfile.h"
VE_VMS_FLASH_FILE::VE_VMS_FLASH_FILE()
{
}
VE_VMS_FLASH_FILE::VE_VMS_FLASH_FILE(int index, VMS_FILE_TYPE t, int firstblock, char *name, int size, int header)
{
//fileNumber means directory entry
fileIndex = index;
type = t;
startBlock = firstblock;
fileName = name;
fileSize = size;
headerBlock = header;
}
///Copy constructor
VE_VMS_FLASH_FILE::VE_VMS_FLASH_FILE(VE_VMS_FLASH_FILE &c)
{
fileIndex = c.getFileIndex();
type = c.getType();
startBlock = c.getStartBlock();
fileName = c.getFileName();
fileSize = c.getFileSize();
headerBlock = c.getHeaderBlock();
}
VMS_FILE_TYPE VE_VMS_FLASH_FILE::getType(int d)
{
d &= 0xFF;
if(d == 0x00) return NONE;
else if(d == 0x33) return DATA;
else if(d == 0xCC) return GAME;
else return UNKNOWN;
}
//Setters and getters
VMS_FILE_TYPE VE_VMS_FLASH_FILE::getType()
{
return type;
}
int VE_VMS_FLASH_FILE::getStartBlock()
{
return startBlock;
}
char * VE_VMS_FLASH_FILE::getFileName()
{
return fileName;
}
int VE_VMS_FLASH_FILE::getFileSize()
{
return fileSize;
}
int VE_VMS_FLASH_FILE::getHeaderBlock()
{
return headerBlock;
}
int VE_VMS_FLASH_FILE::getFileIndex()
{
return fileIndex;
}
void VE_VMS_FLASH_FILE::setType(VMS_FILE_TYPE t)
{
type = t;
}
void VE_VMS_FLASH_FILE::setStartBlock(int s)
{
startBlock = s;
}
void VE_VMS_FLASH_FILE::setFileName(char *name)
{
fileName = name;
}
void VE_VMS_FLASH_FILE::setFileSize(int size)
{
fileSize = size;
}
void VE_VMS_FLASH_FILE::setHeaderBlock(int header)
{
headerBlock = header;
}
void VE_VMS_FLASH_FILE::setFileIndex(int index)
{
fileIndex = index;
}

78
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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef _FLASHFILE_H_
#define _FLASHFILE_H_
enum VMS_FILE_TYPE
{
DATA,
GAME,
NONE,
UNKNOWN = -1
};
///This describes a file inside the VMS
class VE_VMS_FLASH_FILE
{
public:
VE_VMS_FLASH_FILE();
VE_VMS_FLASH_FILE(int index, VMS_FILE_TYPE t, int firstblock, char *name, int size, int header);
///Copy constructor
VE_VMS_FLASH_FILE(VE_VMS_FLASH_FILE &c);
static VMS_FILE_TYPE getType(int d);
//Setters and getters
VMS_FILE_TYPE getType();
int getStartBlock();
char *getFileName();
int getFileSize();
int getHeaderBlock();
int getFileIndex();
void setType(VMS_FILE_TYPE t);
void setStartBlock(int s);
void setFileName(char *name);
void setFileSize(int size);
void setHeaderBlock(int header);
void setFileIndex(int index);
private:
VMS_FILE_TYPE type;
int startBlock;
char *fileName;
int fileSize; ///In blocks
int headerBlock;
int fileIndex;
};
#endif // _FLASHFILE_H_

20
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radius - Today at 3:31 PM
set_environment, set_init, load, run
and the audio, video, input callbacks
the rest need to be there too though
just stubbed
MJaoune - Today at 3:31 PM
yeah sure to prevent "Undefined" errors
the system is a Dreamcast VMU
radius - Today at 3:31 PM
retro_api_version too
and get_system_info
MJaoune - Today at 3:32 PM
as for the audio, it generates square waves, how do I implement that?
radius - Today at 3:32 PM
I think that's all
MJaoune - Today at 3:32 PM
video is just a framebuffer with pixels, how is that implemented too?
radius - Today at 3:32 PM
get_system_av_info
don't forget that

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "interrupts.h"
VE_VMS_INTERRUPTS::VE_VMS_INTERRUPTS()
{
Reset = 0;
INT0 = 0;
INT1 = 0;
INT2 = 0;
INT3 = 0;
T0HOV = 0;
T1HLOV = 0;
SIO0 = 0;
SIO1 = 0;
RFB = 0;
P3_data = 0;
P3_Taken = true;
}
VE_VMS_INTERRUPTS::~VE_VMS_INTERRUPTS()
{
}
//Setters
void VE_VMS_INTERRUPTS::setReset(){
Reset = 1;
}
void VE_VMS_INTERRUPTS::clearReset(){
Reset = 0;
}
void VE_VMS_INTERRUPTS::setINT0(){
INT0 = 1;
}
void VE_VMS_INTERRUPTS::clearINT0(){
INT0 = 0;
}
void VE_VMS_INTERRUPTS::setINT1(){
INT1 = 1;
}
void VE_VMS_INTERRUPTS::clearINT1(){
INT1 = 0;
}
void VE_VMS_INTERRUPTS::setINT2(){
INT2 = 1;
}
void VE_VMS_INTERRUPTS::clearINT2(){
INT2 = 0;
}
void VE_VMS_INTERRUPTS::setINT3(){
INT3 = 1;
}
void VE_VMS_INTERRUPTS::clearINT3(){
INT3 = 0;
}
void VE_VMS_INTERRUPTS::setT0HOV(){
T0HOV = 1;
}
void VE_VMS_INTERRUPTS::clearT0HOV(){
T0HOV = 0;
}
void VE_VMS_INTERRUPTS::setT1HLOV(){
T1HLOV = 1;
}
void VE_VMS_INTERRUPTS::clearT1HLOV(){
T1HLOV = 0;
}
void VE_VMS_INTERRUPTS::setSIO0(){
SIO0 = 1;
}
void VE_VMS_INTERRUPTS::clearSIO0(){
SIO0 = 0;
}
void VE_VMS_INTERRUPTS::setSIO1(){
SIO1 = 1;
}
void VE_VMS_INTERRUPTS::clearSIO1(){
SIO1 = 0;
}
void VE_VMS_INTERRUPTS::setRFB(){
RFB = 1;
}
void VE_VMS_INTERRUPTS::clearRFB(){
RFB = 0;
}
void VE_VMS_INTERRUPTS::setP3(){
P3_data = 1;
}
void VE_VMS_INTERRUPTS::clearP3(){
P3_data = 0;
}
//Getters
byte VE_VMS_INTERRUPTS::getReset()
{
return Reset;
}
byte VE_VMS_INTERRUPTS::getINT0()
{
return INT0;
}
byte VE_VMS_INTERRUPTS::getINT1()
{
return INT1;
}
byte VE_VMS_INTERRUPTS::getINT2()
{
return INT2;
}
byte VE_VMS_INTERRUPTS::getINT3()
{
return INT3;
}
byte VE_VMS_INTERRUPTS::getT0HOV()
{
return T0HOV;
}
byte VE_VMS_INTERRUPTS::getT1HLOV()
{
return T1HLOV;
}
byte VE_VMS_INTERRUPTS::getSIO0()
{
return SIO0;
}
byte VE_VMS_INTERRUPTS::getSIO1()
{
return SIO1;
}
byte VE_VMS_INTERRUPTS::getRFB()
{
return RFB;
}
byte VE_VMS_INTERRUPTS::getP3()
{
return P3_data;
}

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef _INTERRUPTS_H_
#define _INTERRUPTS_H_
#include "common.h"
class VE_VMS_INTERRUPTS
{
public:
VE_VMS_INTERRUPTS();
~VE_VMS_INTERRUPTS();
//Setters
void setReset();
void clearReset();
void setINT0();
void clearINT0();
void setINT1();
void clearINT1();
void setINT2();
void clearINT2();
void setINT3();
void clearINT3();
void setT0HOV();
void clearT0HOV();
void setT1HLOV();
void clearT1HLOV();
void setSIO0();
void clearSIO0();
void setSIO1();
void clearSIO1();
void setRFB();
void clearRFB();
void setP3();
void clearP3();
//Getters
byte getReset();
byte getINT0();
byte getINT1();
byte getINT2();
byte getINT3();
byte getT0HOV();
byte getT1HLOV();
byte getSIO0();
byte getSIO1();
byte getRFB();
byte getP3();
bool P3_Taken;
private:
//Interrupts
byte Reset;
byte INT0;
byte INT1;
byte INT2;
byte INT3;
byte T0HOV;
byte T1HLOV;
byte SIO0;
byte SIO1;
byte RFB;
byte P3_data;
};
#endif // _INTERRUPTS_H_

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LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
APP_DIR := ../../src
LOCAL_MODULE := vemulator
ifeq ($(TARGET_ARCH),arm)
LOCAL_CFLAGS += -DANDROID_ARM
endif
ifeq ($(TARGET_ARCH),x86)
LOCAL_CFLAGS += -DANDROID_X86
endif
ifeq ($(TARGET_ARCH),mips)
LOCAL_CFLAGS += -DANDROID_MIPS -D__mips__ -D__MIPSEL__
endif
LOCAL_SRC_FILES += ../*.cpp
LOCAL_CFLAGS += -O3 -std=gnu++99 -ffast-math -funroll-loops
include $(BUILD_SHARED_LIBRARY)

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APP_ABI := all

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{
global: retro_*;
local: *;
};

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "libretro.h"
#include "vmu.h"
retro_environment_t environment_cb;
retro_video_refresh_t video_cb;
retro_audio_sample_t audio_cb;
retro_audio_sample_batch_t audio_batch_cb;
retro_input_poll_t inputPoll_cb;
retro_input_state_t inputState_cb;
struct retro_variable options[2];
VMU *vmu;
uint16_t *frameBuffer;
byte *romData;
RETRO_API void retro_set_environment(retro_environment_t env)
{
environment_cb = env;
//Set variables (Options)
options[0] = { "enable_flash_write", "Enable flash write (.bin, requires restart); enabled|disabled"};
options[1] = {NULL, NULL};
env(RETRO_ENVIRONMENT_SET_VARIABLES, options);
}
RETRO_API void retro_set_video_refresh(retro_video_refresh_t vr)
{
video_cb = vr;
}
RETRO_API void retro_set_audio_sample(retro_audio_sample_t sample)
{
audio_cb = sample;
}
RETRO_API void retro_set_audio_sample_batch(retro_audio_sample_batch_t batch)
{
audio_batch_cb = batch;
}
RETRO_API void retro_set_input_poll(retro_input_poll_t ipoll)
{
inputPoll_cb = ipoll;
}
RETRO_API void retro_set_input_state(retro_input_state_t istate)
{
inputState_cb = istate;
}
RETRO_API void retro_init(void)
{
frameBuffer = (uint16_t*)calloc(SCREEN_WIDTH*SCREEN_HEIGHT, sizeof(uint16_t));
vmu = new VMU(frameBuffer);
}
RETRO_API void retro_deinit(void)
{
delete vmu;
if(frameBuffer != NULL) free(frameBuffer);
if(romData != NULL) free(romData);
}
RETRO_API unsigned retro_api_version(void)
{
return RETRO_API_VERSION;
}
RETRO_API void retro_get_system_info(struct retro_system_info *info)
{
info->library_name = "VeMUlator";
info->library_version = "0.1";
info->valid_extensions = "vms|bin|dci";
info->need_fullpath = true;
info->block_extract = false;
}
RETRO_API void retro_get_system_av_info(struct retro_system_av_info *info)
{
info->geometry.base_width = SCREEN_WIDTH;
info->geometry.base_height = SCREEN_HEIGHT;
info->geometry.max_width = SCREEN_WIDTH;
info->geometry.max_height = SCREEN_HEIGHT;
info->geometry.aspect_ratio = 0;
info->timing.fps = FPS;
info->timing.sample_rate = SAMPLE_RATE;
}
RETRO_API void retro_set_controller_port_device(unsigned port, unsigned device)
{
}
void processInput()
{
inputPoll_cb();
if(!vmu->cpu->P3_taken) return; //Don't accept new input until previous is processed
byte P3_reg = vmu->ram->readByte_RAW(P3);
int pressFlag = 0;
byte P3_int = vmu->ram->readByte_RAW(P3INT);
P3_reg = ~P3_reg; //Active low
//Up
if(inputState_cb(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP))
{
P3_reg |= 1;
pressFlag++;
}
else P3_reg &= 0xFE;
//Down
if(inputState_cb(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN))
{
P3_reg |= 2;
pressFlag++;
}
else P3_reg &= 0xFD;
//Left
if(inputState_cb(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT))
{
P3_reg |= 4;
pressFlag++;
}
else P3_reg &= 0xFB;
//Right
if(inputState_cb(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT))
{
P3_reg |= 8;
pressFlag++;
}
else P3_reg &= 0xF7;
//A
if(inputState_cb(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A))
{
P3_reg |= 16;
pressFlag++;
}
else P3_reg &= 0xEF;
//B
if(inputState_cb(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B))
{
P3_reg |= 32;
pressFlag++;
}
else P3_reg &= 0xDF;
//Start
if(inputState_cb(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START))
{
//Clicking MODE without a BIOS causes hang
//P3_reg |= 64;
//pressFlag++;
}
//else P3_reg &= 0xBF;
P3_reg = ~P3_reg;
vmu->ram->writeByte_RAW(P3, P3_reg);
if(pressFlag)
{
vmu->ram->writeByte_RAW(P3INT, P3_int | 2);
vmu->intHandler->setP3();
vmu->cpu->P3_taken = false;
}
}
RETRO_API void retro_reset(void)
{
vmu->reset();
}
RETRO_API void retro_run(void)
{
processInput();
//Cycles passed since last screen refresh
uint cyclesPassed = vmu->cpu->getCurrentFrequency() / FPS;
for(uint i = 0; i < cyclesPassed; i++)
vmu->runCycle();
//Video
vmu->video->drawFrame(frameBuffer);
if(vmu->ram->readByte_RAW(MCR) & 8) video_cb(frameBuffer, SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_WIDTH * 2);
//Audio
vmu->audio->generateSignal(audio_cb);
}
RETRO_API size_t retro_serialize_size(void)
{
}
RETRO_API bool retro_serialize(void *data, size_t size)
{
}
RETRO_API bool retro_unserialize(const void *data, size_t size)
{
}
RETRO_API void retro_cheat_reset(void)
{
}
RETRO_API void retro_cheat_set(unsigned index, bool enabled, const char *code)
{
}
RETRO_API bool retro_load_game(const struct retro_game_info *game)
{
//Set environment variables
enum retro_pixel_format format = RETRO_PIXEL_FORMAT_RGB565;
environment_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &format);
//Opening file
FILE *rom = fopen(game->path, "rb");
if(rom == NULL) return false;
fseek(rom, 0, SEEK_END);
size_t romSize = ftell(rom);
fseek(rom, 0 , SEEK_SET);
romData = (byte *)malloc(romSize);
for(size_t i = 0; i < romSize; i++)
romData[i] = fgetc(rom);
fclose(rom);
//Check extension
char *path = (char *)malloc(strlen(game->path) + 1);
strcpy(path, game->path);
char *ext = strchr(path, '.');
//Check needed variables
struct retro_variable var = {0};
var.key = "enable_flash_write";
environment_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var);
//Loading ROM
if(!strcmp(ext, ".bin") || !strcmp(ext, ".BIN"))
{
//Check if user wants core to be able to write to flash
if(!strcmp(var.value, "enabled")) vmu->flash->loadROM(romData, romSize, 0, game->path, true);
else vmu->flash->loadROM(romData, romSize, 0, game->path, false);
}
else if(!strcmp(ext, ".vms") || !strcmp(ext, ".VMS")) vmu->flash->loadROM(romData, romSize, 1, game->path, false);
else if(!strcmp(ext, ".dci") || !strcmp(ext, ".DCI")) vmu->flash->loadROM(romData, romSize, 2, game->path, false);
free(path);
//Initializing system
vmu->startCPU();
return true;
}
RETRO_API bool retro_load_game_special(unsigned game_type, const struct retro_game_info *info, size_t num_info)
{
return false;
}
RETRO_API void retro_unload_game(void)
{
vmu->reset();
}
RETRO_API unsigned retro_get_region(void)
{
}
RETRO_API void *retro_get_memory_data(unsigned id)
{
}
RETRO_API size_t retro_get_memory_size(unsigned id)
{
}

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "ram.h"
VE_VMS_RAM::VE_VMS_RAM()
{
T1LC_Temp = 0;
T1HC_Temp = 0;
data = new byte[1024];
wram = new byte[512];
xram0 = new byte[0x7C];
xram1 = new byte[0x7C];
xram2 = new byte[0x7C];
T1RL_data = 0;
T1RH_data = 0;
}
VE_VMS_RAM::~VE_VMS_RAM()
{
delete []data;
delete []wram;
delete []xram0;
delete []xram1;
delete []xram2;
}
//Setters and getters
byte VE_VMS_RAM::readByte(size_t adr)
{
//printf("Reading raw address %ul\n", adr);
size_t xaddress = adr + (data[STAD] & 0xFF); //Remove start address of XRAM
size_t address = adr;
//If first half of ram is accessed (Not SFR), check Bank to choose whether to access first bank of RAM or second.
//Second bank starts at 256
if(address < 0x100)
{
byte mainBank = ((data[PSW] & 0x2) >> 1) & 0x1; //Get RAM bank
if(mainBank == 1) address += 512;
}
//If XRAM is accessed, we choose the address depending on XBNK SFR.
else if(address >= 0x180 && address <= 0x1FB)
{
byte XRAMBank = data[XBNK] & 0xFF;
switch(XRAMBank)
{
case 0:
return xram0[xaddress - 0x180] & 0xFF;
case 1:
return xram1[xaddress - 0x180] & 0xFF;
case 2:
return xram2[xaddress - 0x180] & 0xFF;
default:
return xram0[xaddress - 0x180] & 0xFF;
}
}
//Work RAM access
if(adr == 0x166)
{
byte VSEL_ = data[VSEL] & 0xFF;
size_t VRMAD = (data[VRMAD1] | (data[VRMAD2] << 8)) & 0x1FF;
size_t VRMAD_original = VRMAD;
//Check if auto increment is enabled
if((VSEL_ & 16) != 0)
{
VRMAD++;
data[VRMAD1] = VRMAD & 0xFF;
data[VRMAD2] = (VRMAD >> 8) & 1;
}
//printf("Work ram buffer accessed! Read\n");
return (wram[VRMAD_original] & 0xFF);
}
if(adr != T1LR && adr != T1HR) //T1 reload registers are the same as T1, so we need to separate them
return (data[address] & 0xFF);
else if(adr == T1LR) return T1RL_data & 0xFF;
else return T1RH_data & 0xFF;
}
//No banking or checking, use carefully!
byte VE_VMS_RAM::readByte_RAW(size_t adr)
{
return data[adr] & 0xFF;
}
//This is used by the GPU only.
byte VE_VMS_RAM::readByteXRAM(size_t adr, int bank)
{
size_t address = adr + (data[STAD] & 0xFF);
switch(bank)
{
case 0:
return xram0[address - 0x180] & 0xFF;
case 1:
return xram1[address - 0x180] & 0xFF;
case 2:
return xram2[address - 0x180] & 0xFF;
default:
return xram0[address - 0x180] & 0xFF;
}
}
void VE_VMS_RAM::writeByte(size_t adr, byte b)
{
//printf("Writing raw address %ul\n", adr);
size_t xaddress = adr + (data[STAD] & 0xFF);
size_t address = adr;
//If first half of ram is accessed (Not SFR), check Bank to choose whether to access first bank of RAM or second.
//Second bank starts at 256
if(address < 0x100)
{
byte mainBank = ((data[PSW] & 0x2) >> 1) & 0x1; //Get RAM bank
if(mainBank == 1) address += 512; //To access second bank in "data[]"
}
//If XRAM is accessed, we choose the address depending on XBNK SFR.
else if(address >= 0x180 && address <= 0x1FB)
{
byte XRAMBank = data[XBNK] & 0xFF;
switch(XRAMBank)
{
case 0:
//VMU_Debug.debugGFX("Writing to XRAM Bank 0, Data= " + Integer.toHexString(b & 0xFF));
xram0[xaddress - 0x180] = b & 0xFF;
return;
case 1:
//VMU_Debug.debugGFX("Writing to XRAM Bank 1, Data= " + Integer.toHexString(b & 0xFF));
xram1[xaddress - 0x180] = b & 0xFF;
return;
case 2:
//VMU_Debug.debugGFX("Writing to XRAM Bank 2, Data= " + Integer.toHexString(b & 0xFF));
xram2[xaddress - 0x180] = b & 0xFF;
return;
default:
//VMU_Debug.debugGFX("(Fault) Writing to XRAM Bank 0, Data= " + Integer.toHexString(b & 0xFF));
xram0[xaddress - 0x180] = b & 0xFF;
return;
}
}
//Work RAM access
if(adr == 0x166)
{
byte VSEL_ = data[VSEL] & 0xFF;
size_t VRMAD = (data[VRMAD1] | (data[VRMAD2] << 8)) & 0x1FF;
size_t VRMAD_original = VRMAD;
//Check if auto increment is enabled
if((VSEL_ & 16) != 0)
{
VRMAD++;
data[VRMAD1] = VRMAD & 0xFF;
data[VRMAD2] = (VRMAD >> 8) & 1;
}
//printf("Work ram buffer accessed! Write");
wram[VRMAD_original] = b & 0xFF;
return;
}
if(address != T1LC && address != T1HC)
{
data[address] = b & 0xFF;
return;
}
//T1LC and T1HC are updated only when bit4 of T1CNT is enabled (This is checked each cycle).
if(address == T1LC) T1LC_Temp = b & 0xFF;
else T1HC_Temp = b & 0xFF;
}
void VE_VMS_RAM::writeByte_RAW(size_t adr, byte b)
{
data[adr] = b & 0xFF;
}
//Stack operations (To ensure writing to bank 0 only)
void VE_VMS_RAM::stackPush(byte d)
{
data[SP] += 1;
data[data[SP]] = d & 0xFF;
}
byte VE_VMS_RAM::stackPop()
{
data[SP] -= 1;
return data[data[SP] + 1] & 0xFF;
}
byte *VE_VMS_RAM::getData()
{
return data;
}

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef _RAM_H_
#define _RAM_H_
#include "common.h"
//SFR
#define ACC 0x100
#define PSW 0x101
#define B 0x102
#define C 0x103
#define TRL 0x104
#define TRH 0x105
#define SP 0x106
#define PCON 0x107
#define IE 0x108
#define IP 0x109
#define EXT 0x10D
#define OCR 0x10E
#define T0CNT 0x110
#define T0PRR 0x111
#define T0L 0x112
#define T0LR 0x113
#define T0H 0x114
#define T0HR 0x115
#define T1CNT 0x118
#define T1LC 0x11a
#define T1LR 0x11b
#define T1HC 0x11c
#define T1HR 0x11d
#define MCR 0x120
#define STAD 0x122
#define CNR 0x123
#define TDR 0x124
#define XBNK 0x125
#define VCCR 0x127
#define SCON0 0x130
#define SBUF0 0x131
#define SBR 0x132
#define SCON1 0x134
#define SBUF1 0x135
#define P1 0x144
#define P1DDR 0x145
#define P1FCR 0x146
#define P3 0x14c
#define P3DDR 0x14d
#define P3INT 0x14e
#define P7 0x15c
#define I01CR 0x15d
#define I23CR 0x15e
#define ISL 0x15f
#define VSEL 0x163
#define VRMAD1 0x164
#define VRMAD2 0x165
#define VTRBF 0x166
#define BTCR 0x17f
#define XRAM 0x180
class VE_VMS_RAM
{
public:
//Extra
//The following 2 hold values for T1LC and T1HC until T1CNT bit 4 is set
byte T1LC_Temp;
byte T1HC_Temp;
//Timer 1 reload registers (Stored here since they will be used in this class too)
byte T1RL_data;
byte T1RH_data;
VE_VMS_RAM();
~VE_VMS_RAM();
//Setters and getters
byte readByte(size_t adr);
//No banking or checking, use carefully!
byte readByte_RAW(size_t adr);
///This is used by the GPU only.
byte readByteXRAM(size_t adr, int bank);
void writeByte(size_t adr, byte b);
void writeByte_RAW(size_t adr, byte b);
//Stack operations (To ensure writing to bank 0 only)
void stackPush(byte d);
byte stackPop();
byte *getData();
private:
byte *data;
byte *wram;
byte *xram0;
byte *xram1;
byte *xram2;
};
#endif // _RAM_H_

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "rom.h"
VE_VMS_ROM::VE_VMS_ROM()
{
data = new size_t[0x100000];
}
VE_VMS_ROM::~VE_VMS_ROM()
{
delete []data;
}
//Setters and getters
byte VE_VMS_ROM::readByte(size_t address)
{
return data[address] & 0xFF;
}
void VE_VMS_ROM::writeByte(size_t address, byte b)
{
data[address] = b & 0xFF;
}
//Memory operations
void VE_VMS_ROM::loadData(byte *d, size_t buffSize, size_t size)
{
if(buffSize < size) return;
for(size_t i = 0; i < size; i++)
data[i] = d[i];
}
void VE_VMS_ROM::loadData(byte *d, size_t buffSize)
{
for(size_t i = 0; i < buffSize; i++)
data[i] = d[i];
}
size_t *VE_VMS_ROM::getData()
{
return data;
}

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef _ROM_H_
#define _ROM_H_
#include "common.h"
class VE_VMS_ROM
{
public:
VE_VMS_ROM();
~VE_VMS_ROM();
//Setters and getters
byte readByte(size_t address);
void writeByte(size_t address, byte b);
//Memory operations
void loadData(byte *d, size_t buffSize, size_t size);
void loadData(byte *d, size_t buffSize);
size_t *getData();
private:
size_t *data;
};
#endif // _ROM_H_

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cpu => Done
bitwisemath => Done
flash => Done
flashfile => Done
interrupts => Done
ram => Done
rom => Done
t0 => Done
t1 => Done
basetimer => Done
video => Done
audio => Done

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "t0.h"
VE_VMS_TIMER0::VE_VMS_TIMER0(VE_VMS_RAM *_ram, VE_VMS_INTERRUPTS *_intHandler, VE_VMS_CPU *_cpu, byte *_prescaler)
{
ram = _ram;
intHandler = _intHandler;
cpu = _cpu;
prescaler = _prescaler;
TRLStarted = 0;
TRHStarted = 0;
TRL_data = 0;
TRH_data = 0;
}
VE_VMS_TIMER0::~VE_VMS_TIMER0()
{
}
void VE_VMS_TIMER0::runTimer()
{
int TCNT_data = ram->readByte_RAW(T0CNT); //Timer control register
bool TRLEnabled;
bool TRHEnabled;
bool TRLONGEnabled;
TRLEnabled = (TCNT_data & 64) != 0;
TRHEnabled = (TCNT_data & 128) != 0;
TRLONGEnabled = (TCNT_data & 32) != 0;
//int clockSource = ((TCNT_data & 16) >> 4) & 0xFF;
//if(clockSource == 1) return; //External pin, not supported
//Increase timers
if(TRLEnabled)
{
if(TRLStarted++ == 0)
{
TRL_data = ram->readByte_RAW(T0LR);
//printf("Started T0RL\n");
}
else if(*prescaler == 1) TRL_data++;
}
else
{
TRL_data = ram->readByte_RAW(T0LR);
TRLStarted = 0;
}
if(TRHEnabled)
{
if(TRHStarted++ == 0)
{
TRH_data = ram->readByte_RAW(T0HR);
//printf("Started T0RH\n");
}
else if(!TRLONGEnabled)
{
if(*prescaler == 1)
TRH_data++;
}
}
else
{
TRH_data = ram->readByte_RAW(T0HR);
TRHStarted = 0;
}
//if(TRLONGEnabled) printf("Long mode.\n");
//Overflow in TRL_data, 8-bit mode
if(TRL_data > 255 && !TRLONGEnabled)
{
TCNT_data |= 2;
if (TCNT_data & 1) intHandler->setINT2();
//Stop timer
//TCNT_data &= 0xBF;
//Reload contents
TRL_data = ram->readByte_RAW(T0LR);
}
//Overflow in TRL_data, 16-bit mode
else if(TRL_data > 255 && TRLONGEnabled)
{
TRH_data++;
if (TCNT_data & 1) intHandler->setINT2();
//Reload contents
TRL_data = ram->readByte_RAW(T0LR);
//TRL_data = 0;
}
//Overflow in TRH_data, 8-bit mode
if(TRH_data > 255 && !TRLONGEnabled)
{
//printf("T0RH overflow 8-bit\n");
TCNT_data |= 8;
if (TCNT_data & 4) intHandler->setT0HOV();
//Stop timer
TCNT_data &= 0x7F; //Not forcefully stopping it causes a hang in Chao Adventure 1 when navigating through the menu
//Reload contents
TRH_data = ram->readByte_RAW(T0HR);
}
//Overflow in 16-bit mode
else if(TRH_data > 255 && TRLONGEnabled)
{
//printf("T0 LONG overflow 16-bit\n");
TCNT_data |= 2;
TCNT_data |= 8;
if (TCNT_data & 4) intHandler->setT0HOV();
//Stop both timers
//TCNT_data &= 0x3F;
//Reload contents
TRL_data = ram->readByte_RAW(T0LR);
TRH_data = ram->readByte_RAW(T0HR);
}
ram->writeByte_RAW(T0L, TRL_data);
ram->writeByte_RAW(T0H, TRH_data);
ram->writeByte_RAW(T0CNT, TCNT_data);
}

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef _T0_H_
#define _T0_H_
#include "ram.h"
#include "interrupts.h"
#include "cpu.h"
class VE_VMS_TIMER0
{
public:
VE_VMS_TIMER0(VE_VMS_RAM *_ram, VE_VMS_INTERRUPTS *_intHandler, VE_VMS_CPU *_cpu, byte *_prescaler);
~VE_VMS_TIMER0();
void runTimer();
private:
int TRLStarted;
int TRHStarted;
VE_VMS_RAM *ram;
VE_VMS_INTERRUPTS *intHandler;
VE_VMS_CPU *cpu;
byte *prescaler;
double TRL_data;
double TRH_data;
};
#endif // _T0_H_

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "t1.h"
VE_VMS_TIMER1::VE_VMS_TIMER1(VE_VMS_RAM *_ram, VE_VMS_INTERRUPTS *_intHandler, VE_VMS_AUDIO *_audio)
{
ram = _ram;
intHandler = _intHandler;
audio = _audio;
TRLStarted = 0;
TRHStarted = 0;
}
VE_VMS_TIMER1::~VE_VMS_TIMER1()
{
}
void VE_VMS_TIMER1::runTimer()
{
int TCNT_data = ram->readByte_RAW(T1CNT); //Timer control register
bool TRLEnabled;
bool TRHEnabled;
bool TRLONGEnabled;
TRLEnabled = (TCNT_data & 64) != 0;
TRHEnabled = (TCNT_data & 128) != 0;
TRLONGEnabled = (TCNT_data & 32) != 0;
//Increase timers
if(TRLEnabled)
{
if(TRLStarted++ == 0)
{
ram->T1RL_data = ram->readByte_RAW(T1LR);
audio->setT1(ram->T1RL_data);
//printf("Started T1RL\n");
}
ram->T1RL_data++;
if(TRLONGEnabled && !TRHEnabled) ram->T1RL_data++; //Tcyc/2, equivalent to ram->T1RL_data += 2;
}
else
{
ram->T1RL_data = ram->readByte_RAW(T1LR);
TRLStarted = 0;
}
audio->setEnabled(TRLEnabled & !TRLONGEnabled);
if(TRHEnabled)
{
TRHStarted++;
if(!TRLONGEnabled) ram->T1RH_data++;
}
else
{
ram->T1RH_data = ram->readByte_RAW(T1HR);
TRHStarted = 0;
}
//Overflow in ram->T1RL_data, 8-bit mode
if(ram->T1RL_data > 255 && !TRLONGEnabled)
{
TCNT_data |= 2;
if ((TCNT_data & 1) != 0) intHandler->setT1HLOV();
//Stop timer
//TCNT_data &= 0xBF;
//Reload contents
ram->T1RL_data = ram->readByte_RAW(T1LR);
}
//Overflow in ram->T1RL_data, 16-bit mode
else if(ram->T1RL_data > 255 && TRLONGEnabled)
{
ram->T1RH_data++;
//Reload contents
ram->T1RL_data = ram->readByte_RAW(T0LR);
}
//Overflow in ram->T1RH_data, 8-bit mode
if(ram->T1RH_data > 255 && !TRLONGEnabled)
{
TCNT_data |= 8;
if ((TCNT_data & 4) != 0) intHandler->setT1HLOV();
//Stop timer
//TCNT_data &= 0x7F;
//Reload contents
ram->T1RH_data = ram->readByte_RAW(T1HR);
}
//Overflow in 16-bit mode
else if(ram->T1RH_data > 255 && TRLONGEnabled)
{
TCNT_data |= 2;
TCNT_data |= 8;
if ((TCNT_data & 4) != 0) intHandler->setT1HLOV();
//Stop both timers
//TCNT_data &= 0x1F;
//Reload contents
ram->T1RL_data = ram->readByte_RAW(T1LR);
ram->T1RH_data = ram->readByte_RAW(T1HR);
}
//ram->writeByte_RAW(ram->T1LR, ram->T1RL_data);
//ram->writeByte_RAW(ram->T1HR, ram->T1RH_data);
ram->writeByte_RAW(T1CNT, TCNT_data);
}

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef _T1_H_
#define _T1_H_
#include "audio.h"
#include "ram.h"
#include "interrupts.h"
class VE_VMS_TIMER1
{
public:
VE_VMS_TIMER1(VE_VMS_RAM *_ram, VE_VMS_INTERRUPTS *_intHandler, VE_VMS_AUDIO *_audio);
~VE_VMS_TIMER1();
void runTimer();
private:
int TRLStarted;
int TRHStarted;
//The counters in T1 are implicit (Not visible to the programmer)
VE_VMS_RAM *ram;
VE_VMS_INTERRUPTS *intHandler;
VE_VMS_AUDIO *audio;
};
#endif // _T1_H_

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display_name = "VeMUlator"
authors = "Mahmoud Jaoune"
supported_extensions = "vms|dci|bin"
corename = "VeMUlator"
categories = "Game"
systemname = "SEGA Visual Memory Unit"
license = "GPL v3"
permissions = ""
display_version = "0.1"
supports_no_game = "false"

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "video.h"
VE_VMS_VIDEO::VE_VMS_VIDEO(VE_VMS_RAM *_ram)
{
ram = _ram;
}
VE_VMS_VIDEO::~VE_VMS_VIDEO()
{
}
void VE_VMS_VIDEO::drawFrame(uint16_t *buffer)
{
//Read XRAM buffer from RAM (WRAM starts at 180), each 6 bytes make 1 horizontal line on-screen
//Each bit declares whether the pixel is on or off
//There is a 4-byte empty space between each two lines (96 bytes) of XRAM buffer.
if((ram->readByte_RAW(MCR) & 8) == 0)
return;
size_t XRAMAddress;
byte MSB = 0x80; //10000000b
//Draw pixels (48x32) for banks 0 and 1 ("i" selects bank)
for(int i = 0, c = 0; i < 2; ++i)
{
XRAMAddress = 0x180;
for (int y = 0; y < 16; y++)
{
byte *pixelLine = new byte[6];
if((y % 2 == 0) && (y > 0)) XRAMAddress += 4;
for(int p = 0; p < 6; p++)
pixelLine[p] = ram->readByteXRAM(XRAMAddress++, i);
//Big-Endian
for (int x = 0; x < 6; x++)
for (int j = 0; j < 8; j++)
buffer[c++] = ((pixelLine[x] & (MSB >> j)) != 0) ? 0 : 0xFFFF;
delete []pixelLine;
}
}
//Draw pixels for bank 2 (BIOS Icons)
/*
* BIOS Icons not needed when HLE is used
*
scaleX /= 2; //Since icons are more pixel dense
scaleY /= 2;
scaleXM8 = 8*scaleX;
float scaleXM24 = 24*scaleX;
float scaleYM66 = 66*scaleY;
for(int i = 0; i < 4; i++) {
if(ram->readByteXRAM(0x181 + i, 2) == 0x00) continue; //Only draw icons shown in XRAM bank 2
int []icon = ICONS[i];
for (int y = 0; y < 32; y++) {
int []pixelLine = new int[3];
System.arraycopy(icon, y * 3, pixelLine, 0, 3);
for (int x = 0; x < 3; x++)
for (int j = 0; j < 8; j++)
screenCanvas.drawRect(marginX + ((x * scaleXM8) + (j * scaleX)) + (i * scaleXM24), marginY + (scaleYM66 + (y * scaleY)), marginX + ((x * scaleXM8) + (j * scaleX)) + scaleX + (i * scaleXM24), marginY + (scaleYM66 + (y * scaleY)) + scaleY, ((pixelLine[x] & (0x80 >> j)) != 0)?pixelColor:noPixelColor);
}
}*/
}

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef _VIDEO_H_
#define _VIDEO_H_
#include "ram.h"
///This keeps track of XRAM and draws on the canvas when refresh rate occurs.
class VE_VMS_VIDEO
{
public:
VE_VMS_VIDEO(VE_VMS_RAM *_ram);
~VE_VMS_VIDEO();
void drawFrame(uint16_t *buffer);
private:
VE_VMS_RAM *ram;
//BIOS icons
/*static int FILE_ICON[] = {
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x01, 0xFF, 0xFC,
0x02, 0x00, 0x0C,
0x04, 0x00, 0x14,
0x08, 0x00, 0x24,
0x10, 0x00, 0x44,
0x20, 0x00, 0x84,
0x40, 0x01, 0x04,
0xFF, 0xFE, 0xF4,
0x01, 0x00, 0x04,
0x01, 0x00, 0x04,
0x01, 0x00, 0x04,
0x01, 0x7F, 0xF4,
0x01, 0x00, 0x04,
0x01, 0x00, 0x04,
0x01, 0x00, 0x04,
0x01, 0x7F, 0xF4,
0x01, 0x00, 0x04,
0x01, 0x00, 0x04,
0x01, 0x00, 0x04,
0x01, 0x7F, 0xF4,
0x01, 0x00, 0x04,
0x01, 0x00, 0x04,
0x01, 0x00, 0x04,
0x01, 0xFF, 0xFC,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00};
static int GAME_ICON[] = {
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x01, 0xFF, 0xFC,
0x01, 0x00, 0x04,
0x01, 0x00, 0x04,
0x01, 0x00, 0x04,
0x01, 0x00, 0x04,
0x01, 0x00, 0x04,
0x01, 0x02, 0x04,
0x01, 0x07, 0x04,
0x01, 0x0F, 0x84,
0x01, 0x1F, 0xC4,
0x01, 0x3F, 0xE4,
0x01, 0x7F, 0xF4,
0x01, 0x7F, 0xF4,
0x01, 0x7F, 0xF4,
0x01, 0x1A, 0xC4,
0x01, 0x02, 0x04,
0x01, 0x07, 0x04,
0x01, 0x0F, 0x84,
0x01, 0x1F, 0xC4,
0x01, 0x00, 0x04,
0x01, 0x00, 0x04,
0x01, 0x00, 0x04,
0x01, 0x00, 0x04,
0x01, 0xFF, 0xFC,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00};
static int CLOCK_ICON[] = {
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x03, 0x80,
0x00, 0x0C, 0x60,
0x00, 0x11, 0x10,
0x00, 0x21, 0x08,
0x00, 0x41, 0x04,
0x00, 0x41, 0x04,
0x00, 0x41, 0x04,
0x00, 0x40, 0xF4,
0x00, 0x40, 0x04,
0x00, 0x40, 0x04,
0x00, 0x40, 0x04,
0x00, 0x20, 0x08,
0x00, 0x10, 0x10,
0x00, 0x0C, 0x60,
0x00, 0x03, 0x80,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00};
static int WRITE_ICON[] = {
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x7F, 0xFC,
0x00, 0x7F, 0xFC,
0x00, 0x7E, 0xFC,
0x00, 0x7E, 0xFC,
0x00, 0x7E, 0xFC,
0x00, 0x7E, 0xFC,
0x00, 0x7E, 0xFC,
0x00, 0x7F, 0xFC,
0x00, 0x7E, 0xFC,
0x00, 0x7F, 0xFC,
0x00, 0x7F, 0xFC,
0x00, 0x7F, 0xFC,
0x00, 0x7F, 0xFC,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00};
static int ICONS[1][4] = {FILE_ICON, GAME_ICON, CLOCK_ICON, WRITE_ICON};*/
};
#endif // _VIDEO_H_

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "vmu.h"
VMU::VMU(uint16_t *_frameBuffer)
{
//Initialize system
ram = new VE_VMS_RAM();
rom = new VE_VMS_ROM();
flash = new VE_VMS_FLASH(ram);
intHandler = new VE_VMS_INTERRUPTS();
cpu = new VE_VMS_CPU(ram, rom, flash, intHandler, true);
audio = new VE_VMS_AUDIO(cpu, ram);
t0 = new VE_VMS_TIMER0(ram, intHandler, cpu, &prescaler);
t1 = new VE_VMS_TIMER1(ram, intHandler, audio);
baseTimer = new VE_VMS_BASETIMER(ram, intHandler, cpu);
video = new VE_VMS_VIDEO(ram);
frameBuffer = _frameBuffer;
//Initialize variables
ccount = 0; //Cycle count
cycle_count = 0;
time_reg = 0;
frame_skip = 0;
CPS = 0; //Real cycles per second
prescaler = 0;
pcount = 0;
oldPRR = -1;
OSC = 0;
OCR_old = -1; //For performance, not to calculate clock each time, unless OCR is changed.
threadReady = false;
inSleepState = false;
BIOSExists = false;
enableSound = true;
useT1ELD = false; //Some mini-game programmers (Especially homebrew creators) don't use it
cycles_left = 0;
}
VMU::~VMU()
{
delete t0;
delete t1;
delete baseTimer;
delete audio;
delete video;
delete flash;
delete cpu;
delete intHandler;
delete ram;
delete rom;
}
int VMU::loadBIOS(const char *filePath)
{
FILE *bios = fopen(filePath, "rb");
if(bios == NULL) return -1;
fseek(bios, 0, SEEK_END);
size_t fileSize = ftell(bios);
fseek(bios, 0, SEEK_SET);
byte *BIOS_Data_Encrypted = new byte[0xF004];
byte *BIOS_Data = new byte[0xF000];
if(fileSize > 0xF004) return -2; //Unknown BIOS image type
for(size_t i = 0; i < fileSize; ++i)
BIOS_Data_Encrypted[i] = fgetc(bios);
fclose(bios);
//Decrypt BIOS file if encrypted (First opcode is not JMPF)
if(BIOS_Data_Encrypted[0] != 0x2A)
{
//Remove first 4 bytes
for (int i = 0; i < 0xF000; ++i)
{
BIOS_Data[i] = BIOS_Data_Encrypted[i + 4];
}
//XOR 0x37
for (int i = 0; i < 0xF000; ++i)
{
BIOS_Data[i] = (byte) ((BIOS_Data[i] ^ 0x37) & 0xFF);
}
}
else
{
//BIOS is not encrypted
for(size_t i = 0; i < 0xF000; ++i)
BIOS_Data[i] = BIOS_Data_Encrypted[i];
}
//Check BIOS one last time (After decrypting)
if(BIOS_Data[0] != 0x2A)
return -1;
BIOSExists = true;
//This is loaded in (64KB) of ROM
for(size_t i = 0; i < 0xF000; ++i)
rom->writeByte(i, BIOS_Data[i]);
delete []BIOS_Data;
delete []BIOS_Data_Encrypted;
return 0;
}
void VMU::halt()
{
cpu->state = 0;
}
void VMU::setDate()
{
//Set time and date
time_t rawTime;
time(&rawTime);
struct tm *currentTime = localtime(&rawTime);
byte day = currentTime->tm_mday & 0xFF;
byte month = currentTime->tm_mon & 0xFF;
byte year = (currentTime->tm_year + 1900) & 0xFF;
byte yearH = (year & 0xFF00) >> 8;
byte yearL = year & 0xFF;
byte hour = currentTime->tm_hour & 0xFF;
byte min = currentTime->tm_min & 0xFF;
byte sec = currentTime->tm_sec & 0xFF;
//BCD time
ram->writeByte_RAW(0x10, int2BCD(year) & 0xFF);
ram->writeByte_RAW(0x11, (int2BCD(year) & 0xFF00) >> 8);
ram->writeByte_RAW(0x12, int2BCD(month));
ram->writeByte_RAW(0x13, int2BCD(day));
ram->writeByte_RAW(0x14, int2BCD(hour));
ram->writeByte_RAW(0x15, int2BCD(min));
ram->writeByte_RAW(0x16, int2BCD(sec));
ram->writeByte_RAW(0x17, yearH);
ram->writeByte_RAW(0x18, yearL);
ram->writeByte_RAW(0x19, month);
ram->writeByte_RAW(0x1A, day);
ram->writeByte_RAW(0x1B, hour);
ram->writeByte_RAW(0x1C, min);
ram->writeByte_RAW(0x1D, sec);
ram->writeByte_RAW(0x50, yearH / 4);
ram->writeByte_RAW(0x51, yearL / 4);
}
//Sets system variables in RAM
void VMU::initBIOS()
{
setDate();
ram->writeByte_RAW(0x31, 0xFF);
//No buttons clicked
ram->writeByte_RAW(P3, 0xFF);
//ram->writeByte(0x6E, 0xFF);
}
void VMU::startCPU()
{
//printf("Starting CPU\n");
if(!BIOSExists)
{
//Enable HLE
ram->writeByte_RAW(EXT, 1);
cpu->EXTOld = 1;
initializeHLE();
} else initBIOS();
cpu->state = 1;
//if(enableSound)
//audioThread.start();
}
void VMU::initializeHLE()
{
//Initialize system variables
setDate();
ram->writeByte_RAW(0x31, 0xFF);
ram->writeByte_RAW(0x6E, 0xFF);
//Initialize SFR
ram->writeByte_RAW(P3, 0xFF);
ram->writeByte_RAW(SP, 0x7F);
ram->writeByte_RAW(PSW, 0x02);
ram->writeByte_RAW(IE, 0x80);
ram->writeByte_RAW(MCR, 0x08);
ram->writeByte_RAW(P7, 0x02);
ram->writeByte_RAW(OCR, 0xA3);
ram->writeByte_RAW(BTCR, 0x41);
}
void VMU::runCycle()
{
//Calculate cpu clock frequency (Only when OCR is changed)
byte OCR_data = ram->readByte_RAW(OCR);
if (OCR_data != OCR_old)
{
int freqDiv = 12;
if ((OCR_data & 128) != 0) freqDiv = 6;
OSC = 0; //Main clock by default is RC
if ((OCR_data & 32) != 0) OSC = 1; //Quartz
//double freq;
if (OSC == 0)
{
//freq = 879.236 / freqDiv;
audio->setAudioFrequency(600000 / freqDiv); //What the real frequency should be
cpu->setFrequency(600000 / freqDiv);
}
else //RC
{
//freq = 32.768 / freqDiv;
audio->setAudioFrequency(32768 / freqDiv); //What the real frequency should be
cpu->setFrequency(32768 / freqDiv);
}
//double clock = (1.00 / freq) * 1000; //In milliseconds
//cpu->clock = (int) clock;//(int) clock;
}
OCR_old = OCR_data;
//int cyclesUsed = 1;
//Set T1LC and T1HC when bit 4 of T1CNT is 1
byte T1CNT_data = ram->readByte_RAW(T1CNT);
bool T1CUpdate = (T1CNT_data & 16) != 0;
if(T1CUpdate)
{
ram->writeByte_RAW(T1LC, ram->T1LC_Temp);
ram->writeByte_RAW(T1HC, ram->T1HC_Temp);
audio->setT1C(ram->T1LC_Temp);
}
//Battery not low
ram->writeByte_RAW(0x31, 0xFF);
ram->writeByte_RAW(P7, 2);
byte PCON_data = ram->readByte_RAW(PCON);
//Execute
if (cpu->state != 0)
{
cpu->processInterrupts();
if (PCON_data == 0) cycles_left = cpu->processInstruction(false);
}
--cycles_left;
//Set prescaler
byte PRR = ram->readByte_RAW(T0PRR);
//This is important since Base Timer interrupts sometimes manipulates PRR, so we reset it so the modulo would be 0 in case number came.
if (PRR != oldPRR)
pcount = PRR;
if (pcount / 256 == 1)
{
prescaler = 1;
pcount = PRR;
}
else
{
prescaler = 0;
pcount++;
}
oldPRR = PRR;
//Run timers (t0 and t1)
t0->runTimer();
t1->runTimer();
baseTimer->runTimer();
//Set VMU date (I just randomly put it at 10000, that is, till the BIOS has fully initialized memory, so it wont manipulate date value)
if (ccount == 10000 && BIOSExists)
setDate();
else ccount++;
cycle_count++;
}
void VMU::reset()
{
delete t0;
delete t1;
delete baseTimer;
delete audio;
delete video;
delete flash;
delete cpu;
delete intHandler;
delete ram;
delete rom;
//Re-initialize system
ram = new VE_VMS_RAM();
rom = new VE_VMS_ROM();
flash = new VE_VMS_FLASH(ram);
intHandler = new VE_VMS_INTERRUPTS();
cpu = new VE_VMS_CPU(ram, rom, flash, intHandler, true);
audio = new VE_VMS_AUDIO(cpu, ram);
t0 = new VE_VMS_TIMER0(ram, intHandler, cpu, &prescaler);
t1 = new VE_VMS_TIMER1(ram, intHandler, audio);
baseTimer = new VE_VMS_BASETIMER(ram, intHandler, cpu);
video = new VE_VMS_VIDEO(ram);
//Re-nitialize variables
ccount = 0; //Cycle count
cycle_count = 0;
time_reg = 0;
frame_skip = 0;
CPS = 0; //Real cycles per second
prescaler = 0;
pcount = 0;
oldPRR = -1;
OSC = 0;
OCR_old = -1; //For performance, not to calculate clock each time, unless OCR is changed.
threadReady = false;
inSleepState = false;
BIOSExists = false;
enableSound = true;
useT1ELD = false; //Some mini-game programmers (Especially homebrew creators) don't use it
cycles_left = 0;
}

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/*
VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
Copyright (C) 2018 Mahmoud Jaoune
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef _VMU_H_
#define _VMU_H_
#include <time.h>
#include "common.h"
#include "ram.h"
#include "cpu.h"
#include "video.h"
#include "rom.h"
#include "audio.h"
#include "t0.h"
#include "t1.h"
#include "basetimer.h"
#include "interrupts.h"
#include "bitwisemath.h"
class VMU
{
public:
VE_VMS_RAM *ram;
VE_VMS_ROM *rom;
VE_VMS_FLASH *flash;
VE_VMS_CPU *cpu;
VE_VMS_TIMER0 *t0;
VE_VMS_TIMER1 *t1;
VE_VMS_BASETIMER *baseTimer;
VE_VMS_INTERRUPTS *intHandler;
VE_VMS_VIDEO *video;
VE_VMS_AUDIO *audio;
VMU(uint16_t *_frameBuffer);
~VMU();
int loadBIOS(const char *filePath);
void halt();
void setDate();
//Sets system variables in RAM
void initBIOS();
void startCPU();
void initializeHLE();
void runCycle();
void reset();
private:
int ccount;
long cycle_count;
long time_reg;
long frame_skip;
double CPS;
byte prescaler;
int pcount;
int oldPRR;
int OSC;
int OCR_old;
bool threadReady;
bool inSleepState;
bool BIOSExists;
bool enableSound;
bool useT1ELD;
int cycles_left; //This counts how many cycles an instruction has, and gets decreased each cycle. Next instruction is processed when it gets 0.
uint16_t *frameBuffer;
};
#endif // _VMU_H_