source/src/vm/pc100/crtc.h

   1 /*
   2         NEC PC-100 Emulator 'ePC-100'
   3
   4         Author : Takeda.Toshiya
   5         Date   : 2008.07.14 -
   6
   7         [ crtc ]
   8 */
   9
  10 #ifndef _CRTC_H_
  11 #define _CRTC_H_
  12
  13 #include "../vm.h"
  14 #include "../../emu.h"
  15 #include "../device.h"
  16
  17 #define SIG_CRTC_BITMASK_LOW    0
  18 #define SIG_CRTC_BITMASK_HIGH   1
  19 #define SIG_CRTC_VRAM_PLANE     2
  20
  21 class CRTC : public DEVICE
  22 {
  23 private:
  24         DEVICE *d_pic;
  25
  26         scrntype palette_pc[16];
  27         uint16 palette[16];
  28         uint8 sel, regs[8];
  29         uint16 vs, cmd;
  30
  31         uint8 vram[0x80000];    // VRAM 128KB * 4planes
  32         uint32 shift, maskl, maskh, busl, bush;
  33         uint32 write_plane, read_plane;
  34
  35         void update_palette(int num);
  36
  37 public:
  38         CRTC(VM* parent_vm, EMU* parent_emu) : DEVICE(parent_vm, parent_emu) {}
  39         ~CRTC() {}
  40
  41         // common functions
  42         void initialize();
  43         void event_vline(int v, int clock);
  44         void write_io8(uint32 addr, uint32 data);
  45         uint32 read_io8(uint32 addr);
  46         void write_memory_mapped_io8(uint32 addr, uint32 data);
  47         uint32 read_memory_mapped_io8(uint32 addr);
  48         void write_memory_mapped_io16(uint32 addr, uint32 data);
  49         uint32 read_memory_mapped_io16(uint32 addr);
  50         void write_signal(int id, uint32 data, uint32 mask);
  51         void save_state(FILEIO* state_fio);
  52         bool load_state(FILEIO* state_fio);
  53
  54         // unique functions
  55         void set_context_pic(DEVICE* device)
  56         {
  57                 d_pic = device;
  58         }
  59         void draw_screen();
  60 };
  61
  62 #endif
  63