source/src/vm/z80tvgame/z80tvgame.cpp

   1 /*
   2         Homebrew Z80 TV GAME SYSTEM Emulator 'eZ80TVGAME'
   3
   4         Author : Takeda.Toshiya
   5         Date   : 2015.04.28-
   6
   7         [ virtual machine ]
   8 */
   9
  10 // http://w01.tp1.jp/~a571632211/z80tvgame/index.html
  11
  12 #include "z80tvgame.h"
  13 #include "../../emu.h"
  14 #include "../device.h"
  15 #include "../event.h"
  16
  17 #ifdef _USE_I8255
  18 #include "../i8255.h"
  19 #else
  20 #include "../z80pio.h"
  21 #endif
  22 #include "../pcm1bit.h"
  23 #include "../z80.h"
  24
  25 #ifdef USE_DEBUGGER
  26 #include "../debugger.h"
  27 #endif
  28
  29 #include "joystick.h"
  30 #include "memory.h"
  31
  32 // ----------------------------------------------------------------------------
  33 // initialize
  34 // ----------------------------------------------------------------------------
  35
  36 VM::VM(EMU* parent_emu) : emu(parent_emu)
  37 {
  38         // create devices
  39         first_device = last_device = NULL;
  40         dummy = new DEVICE(this, emu);  // must be 1st device
  41         event = new EVENT(this, emu);   // must be 2nd device
  42
  43 #ifdef _USE_I8255
  44         pio = new I8255(this, emu);
  45 #else
  46         pio = new Z80PIO(this, emu);
  47 #endif
  48         pcm = new PCM1BIT(this, emu);
  49         cpu = new Z80(this, emu);
  50
  51         joystick = new JOYSTICK(this, emu);
  52         memory = new MEMORY(this, emu);
  53
  54         // set contexts
  55         event->set_context_cpu(cpu);
  56         event->set_context_sound(pcm);
  57
  58 #ifdef _USE_I8255
  59         pio->set_context_port_c(pcm, SIG_PCM1BIT_SIGNAL, 1, 0);
  60 #else
  61         pio->set_context_port_b(pcm, SIG_PCM1BIT_SIGNAL, 1, 0);
  62 #endif
  63         joystick->set_context_pio(pio);
  64
  65         // cpu bus
  66         cpu->set_context_mem(memory);
  67         cpu->set_context_io(pio);
  68         cpu->set_context_intr(dummy);
  69 #ifdef USE_DEBUGGER
  70         cpu->set_context_debugger(new DEBUGGER(this, emu));
  71 #endif
  72
  73         // initialize all devices
  74         for(DEVICE* device = first_device; device; device = device->next_device) {
  75                 device->initialize();
  76         }
  77 }
  78
  79 VM::~VM()
  80 {
  81         // delete all devices
  82         for(DEVICE* device = first_device; device;) {
  83                 DEVICE *next_device = device->next_device;
  84                 device->release();
  85                 delete device;
  86                 device = next_device;
  87         }
  88 }
  89
  90 DEVICE* VM::get_device(int id)
  91 {
  92         for(DEVICE* device = first_device; device; device = device->next_device) {
  93                 if(device->this_device_id == id) {
  94                         return device;
  95                 }
  96         }
  97         return NULL;
  98 }
  99
 100 // ----------------------------------------------------------------------------
 101 // debugger
 102 // ----------------------------------------------------------------------------
 103
 104 #ifdef USE_DEBUGGER
 105 DEVICE *VM::get_cpu(int index)
 106 {
 107         if(index == 0) {
 108                 return cpu;
 109         }
 110         return NULL;
 111 }
 112 #endif
 113
 114 // ----------------------------------------------------------------------------
 115 // drive virtual machine
 116 // ----------------------------------------------------------------------------
 117
 118 void VM::reset()
 119 {
 120         // reset all devices
 121         for(DEVICE* device = first_device; device; device = device->next_device) {
 122                 device->reset();
 123         }
 124 }
 125
 126 void VM::run()
 127 {
 128         event->drive();
 129 }
 130
 131 // ----------------------------------------------------------------------------
 132 // draw screen
 133 // ----------------------------------------------------------------------------
 134
 135 void VM::draw_screen()
 136 {
 137         memory->draw_screen();
 138 }
 139
 140 // ----------------------------------------------------------------------------
 141 // soud manager
 142 // ----------------------------------------------------------------------------
 143
 144 void VM::initialize_sound(int rate, int samples)
 145 {
 146         // init sound manager
 147         event->initialize_sound(rate, samples);
 148
 149         // init sound gen
 150         pcm->init(rate, 8000);
 151 }
 152
 153 uint16* VM::create_sound(int* extra_frames)
 154 {
 155         return event->create_sound(extra_frames);
 156 }
 157
 158 int VM::sound_buffer_ptr()
 159 {
 160         return event->sound_buffer_ptr();
 161 }
 162
 163 #ifdef USE_SOUND_VOLUME
 164 void VM::set_sound_device_volume(int ch, int decibel_l, int decibel_r)
 165 {
 166         if(ch == 0) {
 167                 pcm->set_volume(0, decibel_l, decibel_r);
 168         }
 169 }
 170 #endif
 171
 172 // ----------------------------------------------------------------------------
 173 // user interface
 174 // ----------------------------------------------------------------------------
 175
 176 void VM::open_cart(int drv, const _TCHAR* file_path)
 177 {
 178         if(drv == 0) {
 179                 memory->open_cart(file_path);
 180                 reset();
 181         }
 182 }
 183
 184 void VM::close_cart(int drv)
 185 {
 186         if(drv == 0) {
 187                 memory->close_cart();
 188                 reset();
 189         }
 190 }
 191
 192 bool VM::cart_inserted(int drv)
 193 {
 194         if(drv == 0) {
 195                 return memory->cart_inserted();
 196         } else {
 197                 return false;
 198         }
 199 }
 200
 201 bool VM::now_skip()
 202 {
 203         return event->now_skip();
 204 }
 205
 206 void VM::update_config()
 207 {
 208         for(DEVICE* device = first_device; device; device = device->next_device) {
 209                 device->update_config();
 210         }
 211 }
 212
 213 #define STATE_VERSION   1
 214
 215 void VM::save_state(FILEIO* state_fio)
 216 {
 217         state_fio->FputUint32(STATE_VERSION);
 218
 219         for(DEVICE* device = first_device; device; device = device->next_device) {
 220                 device->save_state(state_fio);
 221         }
 222 }
 223
 224 bool VM::load_state(FILEIO* state_fio)
 225 {
 226         if(state_fio->FgetUint32() != STATE_VERSION) {
 227                 return false;
 228         }
 229         for(DEVICE* device = first_device; device; device = device->next_device) {
 230                 if(!device->load_state(state_fio)) {
 231                         return false;
 232                 }
 233         }
 234         return true;
 235 }
 236