git.mutantstargoat.com Git - retroray/blob - src/dos/vidsys.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <limits.h>
   4 #include <assert.h>
   5 #include "vidsys.h"
   6 #include "vga.h"
   7 #include "drv.h"
   8 #include "cdpmi.h"
   9 #include "logger.h"
  10
  11 struct vid_driver *vid_drvlist[MAX_DRV];
  12 int vid_numdrv;
  13
  14 void *vid_vmem;
  15 int vid_vmem_size;
  16
  17 static struct vid_modeinfo **modes, *cur_mode;
  18 static int num_modes, max_modes;
  19
  20
  21 int vid_init(void)
  22 {
  23         int i, j, len;
  24         struct vid_modeinfo *vm;
  25
  26         vid_numdrv = 0;
  27         free(modes);
  28         modes = 0;
  29         cur_mode = 0;
  30         num_modes = max_modes = 0;
  31
  32         vid_vmem = 0;
  33         vid_vmem_size = 0;
  34
  35         if(dpmi_init() == -1) {
  36                 return -1;
  37         }
  38
  39         vid_register_vga();
  40         vid_register_vbe();
  41         vid_register_s3();
  42
  43         for(i=0; i<vid_numdrv; i++) {
  44                 struct vid_driver *drv = vid_drvlist[i];
  45
  46                 drv->ops->init();
  47
  48                 for(j=0; j<drv->num_modes; j++) {
  49                         if(num_modes >= max_modes) {
  50                                 int newsz = max_modes ? max_modes * 2 : 128;
  51                                 void *tmp = realloc(modes, newsz * sizeof *modes);
  52                                 if(!tmp) {
  53                                         errormsg("failed to allocate modes list\n");
  54                                         return -1;
  55                                 }
  56                                 modes = tmp;
  57                                 max_modes = newsz;
  58                         }
  59
  60                         modes[num_modes++] = drv->modes + j;
  61                 }
  62         }
  63
  64         infomsg("found %d modes:\n", num_modes);
  65         for(i=0; i<num_modes; i+=2) {
  66                 vm = modes[i];
  67                 len = infomsg("[%4s] %04x: %dx%d %dbpp", vm->drv->name, vm->modeno,
  68                                 vm->width, vm->height, vm->bpp);
  69                 if(i + 1 >= num_modes) {
  70                         infomsg("\n");
  71                         break;
  72                 }
  73                 for(j=len; j<40; j++) infomsg(" ");
  74                 vm = modes[i + 1];
  75                 infomsg("[%4s] %04x: %dx%d %dbpp\n", vm->drv->name, vm->modeno,
  76                                 vm->width, vm->height, vm->bpp);
  77         }
  78
  79         return 0;
  80 }
  81
  82 void vid_cleanup(void)
  83 {
  84         int i;
  85
  86         if(cur_mode && cur_mode->modeno != 3) {
  87                 vid_setmode(3);
  88         }
  89
  90         if(vid_vmem >= (void*)0x100000) {
  91                 dpmi_munmap(vid_vmem);
  92         }
  93
  94         for(i=0; i<vid_numdrv; i++) {
  95                 struct vid_driver *drv = vid_drvlist[i];
  96                 drv->ops->cleanup();
  97         }
  98
  99         free(modes);
 100         dpmi_cleanup();
 101 }
 102
 103
 104 int vid_curmode(void)
 105 {
 106         if(cur_mode) {
 107                 return cur_mode->modeno;
 108         }
 109         return -1;
 110 }
 111
 112 void *vid_setmode(int mode)
 113 {
 114         int i;
 115         struct vid_driver *drv;
 116
 117         for(i=0; i<num_modes; i++) {
 118                 if(modes[i]->modeno == mode) {
 119                         drv = modes[i]->drv;
 120                         if(drv->ops->setmode(mode) == 0) {
 121                                 cur_mode = modes[i];
 122
 123                                 if(vid_vmem >= (void*)0x100000) {
 124                                         assert(vid_vmem_size);
 125                                         dpmi_munmap(vid_vmem);
 126                                 }
 127
 128                                 if(modes[i]->vmem_addr < 0x100000) {
 129                                         vid_vmem = (void*)modes[i]->vmem_addr;
 130                                         vid_vmem_size = 0;
 131                                 } else {
 132                                         vid_vmem = dpmi_mmap(modes[i]->vmem_addr, modes[i]->vmem_size);
 133                                         vid_vmem_size = modes[i]->vmem_size;
 134                                 }
 135                                 return vid_vmem;
 136                         }
 137                 }
 138         }
 139         return 0;
 140 }
 141
 142 #define EQUIV_BPP(a, b) \
 143         ((a) == (b) || ((a) == 16 && (b) == 15) || ((a) == 15 && (b) == 16) || \
 144          ((a) == 24 && (b) == 32) || ((a) == 32 && (b) == 24))
 145
 146 int vid_findmode(int xsz, int ysz, int bpp)
 147 {
 148         int i;
 149
 150         for(i=0; i<num_modes; i++) {
 151                 if(modes[i]->width == xsz && modes[i]->height == ysz && modes[i]->bpp == bpp) {
 152                         return modes[i]->modeno;
 153                 }
 154         }
 155
 156         /* try fuzzy bpp matching */
 157         for(i=0; i<num_modes; i++) {
 158                 if(modes[i]->width == xsz && modes[i]->height == ysz &&
 159                                 EQUIV_BPP(modes[i]->bpp, bpp)) {
 160                         return modes[i]->modeno;
 161                 }
 162         }
 163
 164         return -1;
 165 }
 166
 167
 168 struct vid_modeinfo *vid_modeinfo(int mode)
 169 {
 170         int i;
 171
 172         for(i=0; i<num_modes; i++) {
 173                 if(modes[i]->modeno == mode) {
 174                         return modes[i];
 175                 }
 176         }
 177         return 0;
 178 }
 179
 180 int vid_islinear(void)
 181 {
 182         return !vid_isbanked();
 183 }
 184
 185 int vid_isbanked(void)
 186 {
 187         return cur_mode->win_size && vid_vmem < (void*)0x100000;
 188 }
 189
 190 void vid_setpal(int idx, int count, const struct vid_color *col)
 191 {
 192         cur_mode->ops.setpal(idx, count, col);
 193 }
 194
 195 void vid_getpal(int idx, int count, struct vid_color *col)
 196 {
 197         cur_mode->ops.getpal(idx, count, col);
 198 }
 199
 200 void vid_blitfb(void *fb, int pitch)
 201 {
 202         if(pitch <= 0) {
 203                 pitch = cur_mode->pitch;
 204         }
 205         cur_mode->ops.blitfb(fb, pitch);
 206 }
 207
 208 void vid_blitfb32(uint32_t *src, int pitch)
 209 {
 210         int i, j, winpos, winleft;
 211         unsigned char *dest;
 212         uint16_t *dest16;
 213
 214         if(cur_mode->bpp == 32) {
 215                 vid_blitfb(src, pitch);
 216                 return;
 217         }
 218
 219         if(pitch <= 0) {
 220                 pitch = cur_mode->width << 2;
 221         }
 222
 223         if(vid_islinear()) {
 224                 winleft = INT_MAX;
 225         } else {
 226                 winleft = 65536;/*cur_mode->win_size << 10;*/
 227                 winpos = 0;
 228                 vid_setwin(0, 0);
 229         }
 230
 231         switch(cur_mode->bpp) {
 232         case 8:
 233                 /* TODO */
 234                 break;
 235
 236         case 15:
 237                 /* TODO */
 238                 break;
 239         case 16:
 240                 /* TODO */
 241                 break;
 242
 243         case 24:
 244                 dest = vid_vmem;
 245                 for(i=0; i<cur_mode->height; i++) {
 246                         for(j=0; j<cur_mode->width; j++) {
 247                                 uint32_t pixel = src[j];
 248                                 if(winleft <= 0) {
 249                                         winpos += cur_mode->win_step;
 250                                         vid_setwin(0, winpos);
 251                                         winleft = 65536;/*cur_mode->win_size << 10;*/
 252                                         dest = vid_vmem;
 253                                 }
 254                                 dest[0] = (pixel >> 16) & 0xff;
 255                                 dest[1] = (pixel >> 8) & 0xff;
 256                                 dest[2] = pixel & 0xff;
 257                                 dest += 3;
 258                                 winleft -= 3;
 259                         }
 260                         src = (uint32_t*)((char*)src + pitch);
 261                 }
 262                 break;
 263
 264         default:
 265                 break;
 266         }
 267 }