source/src/vm/pc6001/display.cpp

   1 /*
   2         NEC PC-6001 Emulator 'yaPC-6001'
   3
   4         Author : Takeda.Toshiya
   5         Date   : 2013.08.22-
   6
   7         [ display ]
   8 */
   9
  10 #include "display.h"
  11 #include "timer.h"
  12 #include "../mc6847.h"
  13
  14 void DISPLAY::reset()
  15 {
  16         vram_ptr = ram_ptr + 0xe000;
  17 }
  18
  19 void DISPLAY::write_io8(uint32_t addr, uint32_t data)
  20 {
  21         unsigned int VRAMHead[4] = { 0xc000, 0xe000, 0x8000, 0xa000 };
  22         uint16_t port=(addr & 0x00ff);
  23
  24         switch (port) {
  25         case 0xB0:
  26                 vram_ptr = (ram_ptr + VRAMHead[(data & 0x06) >> 1]);
  27                 d_timer->set_portB0(data);
  28                 break;
  29         }
  30 }
  31
  32 void DISPLAY::draw_screen()
  33 {
  34         d_vdp->write_signal(SIG_MC6847_AG, *vram_ptr, 0x80);
  35         d_vdp->write_signal(SIG_MC6847_GM, *vram_ptr >> 4, 1);
  36         d_vdp->write_signal(SIG_MC6847_GM, *vram_ptr >> 2, 2);
  37         d_vdp->write_signal(SIG_MC6847_GM, *vram_ptr >> 0, 4);
  38         d_vdp->write_signal(SIG_MC6847_CSS, *vram_ptr, 0x02);
  39         if(*vram_ptr & 0x80) {
  40                 d_vdp->set_vram_ptr(vram_ptr + 0x200, 0x1800);
  41         } else {
  42                 d_vdp->set_vram_ptr(vram_ptr, 0x1800);
  43         }
  44         d_vdp->draw_screen();
  45 }
  46
  47 #define STATE_VERSION   1
  48
  49 #include "../../statesub.h"
  50
  51 void DISPLAY::decl_state()
  52 {
  53         enter_decl_state(STATE_VERSION);
  54
  55         DECL_STATE_ENTRY_INT32(tmp_vram_size);
  56
  57         leave_decl_state();
  58 }
  59
  60 void DISPLAY::save_state(FILEIO* state_fio)
  61 {
  62         tmp_vram_size = (int)(vram_ptr - ram_ptr);
  63
  64         if(state_entry != NULL) {
  65                 state_entry->save_state(state_fio);
  66         }
  67 //      state_fio->FputUint32(STATE_VERSION);
  68 //      state_fio->FputInt32(this_device_id);
  69
  70 //      state_fio->FputInt32((int)(vram_ptr - ram_ptr));
  71 }
  72
  73 bool DISPLAY::load_state(FILEIO* state_fio)
  74 {
  75         bool mb = false;
  76         if(state_entry != NULL) {
  77                 mb = state_entry->load_state(state_fio);
  78         }
  79         if(!mb) {
  80                 return false;
  81         }
  82 //      if(state_fio->FgetUint32() != STATE_VERSION) {
  83 //              return false;
  84 //      }
  85 //      if(state_fio->FgetInt32() != this_device_id) {
  86 //              return false;
  87 //      }
  88 //      vram_ptr = ram_ptr + state_fio->FgetInt32();
  89         vram_ptr = ram_ptr + tmp_vram_size;
  90         return true;
  91 }
  92
  93 bool DISPLAY::process_state(FILEIO* state_fio, bool loading)
  94 {
  95         if(!state_fio->StateCheckUint32(STATE_VERSION)) {
  96                 return false;
  97         }
  98         if(!state_fio->StateCheckInt32(this_device_id)) {
  99                 return false;
 100         }
 101         if(loading) {
 102                 vram_ptr = ram_ptr + state_fio->FgetInt32_LE();
 103         } else {
 104                 state_fio->FputInt32_LE((int)(vram_ptr - ram_ptr));
 105         }
 106         return true;
 107 }