source/src/vm/pc8201/lcd.cpp

   1 /*
   2         NEC PC-8201 Emulator 'ePC-8201'
   3
   4         Author : Takeda.Toshiya
   5         Date   : 2009.04.01-
   6
   7         [ lcd ]
   8 */
   9
  10 #include "lcd.h"
  11
  12 void LCD::initialize()
  13 {
  14         memset(seg, 0, sizeof(seg));
  15         sel = 0;
  16 }
  17
  18 void LCD::write_io8(uint32_t addr, uint32_t data)
  19 {
  20         if(addr & 1) {
  21                 // data
  22                 for(int b = 0; b < 10; b++) {
  23                         if(sel & (1 << b)) {
  24                                 seg[b].vram[seg[b].page][seg[b].ofs] = data;
  25 //                              seg[b].ofs2 = seg[b].ofs;
  26                                 if(!seg[b].updown) {
  27                                         if(++seg[b].ofs > 49) {
  28                                                 seg[b].ofs = 0;
  29                                         }
  30                                 } else {
  31                                         if(--seg[b].ofs < 0) {
  32                                                 seg[b].ofs = 49;
  33                                         }
  34                                 }
  35                         }
  36                 }
  37         } else {
  38                 for(int b = 0; b < 10; b++) {
  39                         if(sel & (1 << b)) {
  40                                 // command
  41                                 switch(data) {
  42                                 case 0x32:
  43                                 case 0x33:
  44                                         seg[b].updown = data & 1;
  45                                         break;
  46                                 case 0x38:
  47                                 case 0x39:
  48                                         seg[b].disp = data & 1;
  49                                         break;
  50                                 case 0x3a:
  51                                 case 0x3b:
  52                                         seg[b].updown = (data ^ 1) & 1;
  53                                         break;
  54                                 case 0x3e:
  55                                 case 0x3f:
  56                                 case 0x7e:
  57                                 case 0x7f:
  58                                 case 0xbe:
  59                                 case 0xbf:
  60                                 case 0xfe:
  61                                 case 0xff:
  62                                         seg[b].spg = data >> 6;
  63                                         break;
  64                                 default:
  65                                         seg[b].page = data >> 6;
  66                                         seg[b].ofs = data & 0x3f;
  67                                         if(seg[b].ofs > 49) {
  68                                                 seg[b].ofs = 49;
  69                                         }
  70                                         break;
  71                                 }
  72                         }
  73                 }
  74         }
  75 }
  76
  77 uint32_t LCD::read_io8(uint32_t addr)
  78 {
  79         uint8_t val = 0xff;
  80
  81         if(addr & 1) {
  82                 // data
  83                 for(int b = 0; b < 10; b++) {
  84                         if(sel & (1 << b)) {
  85                                 val &= seg[b].vram[seg[b].page][seg[b].ofs2];
  86                                 seg[b].ofs2 = seg[b].ofs;
  87                                 if(!seg[b].updown) {
  88                                         if(++seg[b].ofs > 49) {
  89                                                 seg[b].ofs = 0;
  90                                         }
  91                                 } else {
  92                                         if(--seg[b].ofs < 0) {
  93                                                 seg[b].ofs = 49;
  94                                         }
  95                                 }
  96                         }
  97                 }
  98         } else {
  99                 // status
 100                 for(int b = 0; b < 10; b++) {
 101                         if(sel & (1 << b)) {
 102                                 val &= (seg[b].updown ? 0x40 : 0) | (seg[b].disp ? 0x20 : 0) | 0xf;
 103                         }
 104                 }
 105         }
 106         return val;
 107 }
 108
 109 void LCD::write_signal(int id, uint32_t data, uint32_t mask)
 110 {
 111         if(id == SIG_LCD_CHIPSEL_L) {
 112                 sel = (sel & 0x300) | (data);
 113         } else if(id == SIG_LCD_CHIPSEL_H) {
 114                 sel = (sel & 0xff) | ((data & 3) << 8);
 115         }
 116 }
 117
 118 void LCD::draw_screen()
 119 {
 120         // render screen
 121         memset(screen, 0, sizeof(screen));
 122         for(int b = 0; b < 10; b++) {
 123                 if(seg[b].disp) {
 124                         int xofs = (b % 5) * 50;
 125                         for(int p = 0; p < 4; p++) {
 126                                 uint8_t* src = seg[b].vram[(seg[b].spg + p) & 3];
 127                                 int yofs = (b < 5 ? 0 : 32) + p * 8;
 128                                 uint8_t* dst0 = &screen[yofs + 0][xofs];
 129                                 uint8_t* dst1 = &screen[yofs + 1][xofs];
 130                                 uint8_t* dst2 = &screen[yofs + 2][xofs];
 131                                 uint8_t* dst3 = &screen[yofs + 3][xofs];
 132                                 uint8_t* dst4 = &screen[yofs + 4][xofs];
 133                                 uint8_t* dst5 = &screen[yofs + 5][xofs];
 134                                 uint8_t* dst6 = &screen[yofs + 6][xofs];
 135                                 uint8_t* dst7 = &screen[yofs + 7][xofs];
 136                                 for(int i = 0; i < 50; i++) {
 137                                         uint8_t pat = src[i];
 138                                         dst0[i] = pat & 0x01;
 139                                         dst1[i] = pat & 0x02;
 140                                         dst2[i] = pat & 0x04;
 141                                         dst3[i] = pat & 0x08;
 142                                         dst4[i] = pat & 0x10;
 143                                         dst5[i] = pat & 0x20;
 144                                         dst6[i] = pat & 0x40;
 145                                         dst7[i] = pat & 0x80;
 146                                 }
 147                         }
 148                 }
 149         }
 150
 151         // copy to real screen
 152         scrntype_t cd = RGB_COLOR(48, 56, 16);
 153         scrntype_t cb = RGB_COLOR(160, 168, 160);
 154         for(int y = 0; y < 64; y++) {
 155                 scrntype_t* dst = emu->get_screen_buffer(y);
 156                 uint8_t* src = screen[y];
 157
 158                 for(int x = 0; x < 240; x++) {
 159                         dst[x] = src[x] ? cd : cb;
 160                 }
 161         }
 162 }
 163
 164 #define STATE_VERSION   1
 165
 166 bool LCD::process_state(FILEIO* state_fio, bool loading)
 167 {
 168         if(!state_fio->StateCheckUint32(STATE_VERSION)) {
 169                 return false;
 170         }
 171         if(!state_fio->StateCheckInt32(this_device_id)) {
 172                 return false;
 173         }
 174         //state_fio->StateBuffer(seg, sizeof(seg), 1);
 175         for(int i = 0; i < 10; i++) {
 176                 state_fio->StateBuffer(&(seg[i].vram[0][0]), sizeof(seg[i].vram), 1);
 177                 state_fio->StateInt32(seg[i].updown);
 178                 state_fio->StateInt32(seg[i].disp);
 179                 state_fio->StateInt32(seg[i].spg);
 180                 state_fio->StateInt32(seg[i].page);
 181                 state_fio->StateInt32(seg[i].ofs);
 182                 state_fio->StateInt32(seg[i].ofs2);
 183         }
 184         state_fio->StateUint16(sel);
 185         return true;
 186 }