source/src/vm/msx/joystick.cpp

   1 /*
   2         ASCII MSX1 Emulator 'yaMSX1'
   3         ASCII MSX2 Emulator 'yaMSX2'
   4         Pioneer PX-7 Emulator 'ePX-7'
   5
   6         Author : tanam
   7         Date   : 2013.06.29-
   8
   9         modified by Takeda.Toshiya
  10         modified by umaiboux
  11
  12         [ joystick ]
  13 */
  14
  15 #include "joystick.h"
  16 #include "../ym2203.h"
  17
  18 void JOYSTICK::initialize()
  19 {
  20         joy_stat = emu->get_joy_buffer();
  21         select = 0;
  22
  23         // register event to update the key status
  24         register_frame_event(this);
  25 }
  26
  27 void JOYSTICK::event_frame()
  28 {
  29         d_psg->write_signal(SIG_YM2203_PORT_A, ~(joy_stat[select] & 0x3f), 0x7f);
  30 }
  31
  32 void JOYSTICK::write_signal(int id, uint32 data, uint32 mask)
  33 {
  34         if(id == SIG_JOYSTICK_SEL) {
  35                 if(select != ((data & mask) != 0)) {
  36                         select = ((data & mask) != 0);
  37                         d_psg->write_signal(SIG_YM2203_PORT_A, ~(joy_stat[select] & 0x3f), 0x7f);
  38                 }
  39         }
  40 }
  41
  42 #define STATE_VERSION   1
  43
  44 void JOYSTICK::save_state(FILEIO* state_fio)
  45 {
  46         state_fio->FputUint32(STATE_VERSION);
  47         state_fio->FputInt32(this_device_id);
  48
  49         state_fio->FputInt32(select);
  50 }
  51
  52 bool JOYSTICK::load_state(FILEIO* state_fio)
  53 {
  54         if(state_fio->FgetUint32() != STATE_VERSION) {
  55                 return false;
  56         }
  57         if(state_fio->FgetInt32() != this_device_id) {
  58                 return false;
  59         }
  60         select = state_fio->FgetInt32();
  61         return true;
  62 }
  63