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         dummy->set_device_name(_T("1st Dummy"));
  43
  44 #ifdef _USE_I8255
  45         pio = new I8255(this, emu);
  46 #else
  47         pio = new Z80PIO(this, emu);
  48 #endif
  49         pcm = new PCM1BIT(this, emu);
  50         cpu = new Z80(this, emu);
  51
  52         joystick = new JOYSTICK(this, emu);
  53         memory = new MEMORY(this, emu);
  54
  55         // set contexts
  56         event->set_context_cpu(cpu);
  57         event->set_context_sound(pcm);
  58
  59         // Sound:: Force realtime rendering. This is temporally fix. 20161024 K.O
  60         //pcm->set_realtime_render(true);
  61
  62 #ifdef _USE_I8255
  63         pio->set_context_port_c(pcm, SIG_PCM1BIT_SIGNAL, 1, 0);
  64 #else
  65         pio->set_context_port_b(pcm, SIG_PCM1BIT_SIGNAL, 1, 0);
  66 #endif
  67         joystick->set_context_pio(pio);
  68
  69         // cpu bus
  70         cpu->set_context_mem(memory);
  71         cpu->set_context_io(pio);
  72         cpu->set_context_intr(dummy);
  73 #ifdef USE_DEBUGGER
  74         cpu->set_context_debugger(new DEBUGGER(this, emu));
  75 #endif
  76
  77         // initialize all devices
  78         for(DEVICE* device = first_device; device; device = device->next_device) {
  79                 device->initialize();
  80         }
  81 }
  82
  83 VM::~VM()
  84 {
  85         // delete all devices
  86         for(DEVICE* device = first_device; device;) {
  87                 DEVICE *next_device = device->next_device;
  88                 device->release();
  89                 delete device;
  90                 device = next_device;
  91         }
  92 }
  93
  94 DEVICE* VM::get_device(int id)
  95 {
  96         for(DEVICE* device = first_device; device; device = device->next_device) {
  97                 if(device->this_device_id == id) {
  98                         return device;
  99                 }
 100         }
 101         return NULL;
 102 }
 103
 104 // ----------------------------------------------------------------------------
 105 // debugger
 106 // ----------------------------------------------------------------------------
 107
 108 #ifdef USE_DEBUGGER
 109 DEVICE *VM::get_cpu(int index)
 110 {
 111         if(index == 0) {
 112                 return cpu;
 113         }
 114         return NULL;
 115 }
 116 #endif
 117
 118 // ----------------------------------------------------------------------------
 119 // drive virtual machine
 120 // ----------------------------------------------------------------------------
 121
 122 void VM::reset()
 123 {
 124         // reset all devices
 125         for(DEVICE* device = first_device; device; device = device->next_device) {
 126                 device->reset();
 127         }
 128 }
 129
 130 void VM::run()
 131 {
 132         event->drive();
 133 }
 134
 135 // ----------------------------------------------------------------------------
 136 // draw screen
 137 // ----------------------------------------------------------------------------
 138
 139 void VM::draw_screen()
 140 {
 141         memory->draw_screen();
 142 }
 143
 144 // ----------------------------------------------------------------------------
 145 // soud manager
 146 // ----------------------------------------------------------------------------
 147
 148 void VM::initialize_sound(int rate, int samples)
 149 {
 150         // init sound manager
 151         event->initialize_sound(rate, samples);
 152
 153         // init sound gen
 154         pcm->initialize_sound(rate, 8000);
 155 }
 156
 157 uint16_t* VM::create_sound(int* extra_frames)
 158 {
 159         return event->create_sound(extra_frames);
 160 }
 161
 162 int VM::get_sound_buffer_ptr()
 163 {
 164         return event->get_sound_buffer_ptr();
 165 }
 166
 167 #ifdef USE_SOUND_VOLUME
 168 void VM::set_sound_device_volume(int ch, int decibel_l, int decibel_r)
 169 {
 170         if(ch == 0) {
 171                 pcm->set_volume(0, decibel_l, decibel_r);
 172         }
 173 }
 174 #endif
 175
 176 // ----------------------------------------------------------------------------
 177 // user interface
 178 // ----------------------------------------------------------------------------
 179
 180 void VM::open_cart(int drv, const _TCHAR* file_path)
 181 {
 182         if(drv == 0) {
 183                 memory->open_cart(file_path);
 184                 reset();
 185         }
 186 }
 187
 188 void VM::close_cart(int drv)
 189 {
 190         if(drv == 0) {
 191                 memory->close_cart();
 192                 reset();
 193         }
 194 }
 195
 196 bool VM::is_cart_inserted(int drv)
 197 {
 198         if(drv == 0) {
 199                 return memory->is_cart_inserted();
 200         } else {
 201                 return false;
 202         }
 203 }
 204
 205 bool VM::is_frame_skippable()
 206 {
 207         return event->is_frame_skippable();
 208 }
 209
 210 void VM::update_config()
 211 {
 212         for(DEVICE* device = first_device; device; device = device->next_device) {
 213                 device->update_config();
 214         }
 215 }
 216
 217 #define STATE_VERSION   1
 218
 219 void VM::save_state(FILEIO* state_fio)
 220 {
 221         state_fio->FputUint32(STATE_VERSION);
 222
 223         for(DEVICE* device = first_device; device; device = device->next_device) {
 224                 device->save_state(state_fio);
 225         }
 226 }
 227
 228 bool VM::load_state(FILEIO* state_fio)
 229 {
 230         if(state_fio->FgetUint32() != STATE_VERSION) {
 231                 return false;
 232         }
 233         for(DEVICE* device = first_device; device; device = device->next_device) {
 234                 if(!device->load_state(state_fio)) {
 235                         return false;
 236                 }
 237         }
 238         return true;
 239 }
 240