src/0.c

   1 #include <hw/cpu/cpu.h>
   2 #include <hw/dos/dos.h>
   3 #include <hw/vga/vga.h>
   4 #include <hw/vga/vrl.h>
   5
   6 #include "src/tesuto.h"
   7
   8 #define FILENAME_1 "data/aconita.vrl"
   9 #define FILENAME_2 "data/aconita.pal"
  10
  11 static unsigned char palette[768];
  12 global_game_variables_t gvar;
  13
  14 int main(int argc,char **argv) {
  15         struct vrl1_vgax_header *vrl_header;
  16         vrl1_vgax_offset_t *vrl_lineoffs;
  17         unsigned char *buffer;
  18         unsigned int bufsz;
  19         int fd;
  20         char *bakapee1,*bakapee2;
  21
  22         bakapee1=malloc(64);
  23         bakapee2=malloc(1024);
  24
  25         if (argc < 3) {
  26                 fprintf(stderr,"drawvrl <VRL file> <palette file>\n");
  27                 bakapee1 = FILENAME_1;//"data/aconita.vrl";
  28                 bakapee2 = FILENAME_2;//"data/aconita.pal";
  29                 //return 1;
  30         }else{
  31                 if(argv[1]) bakapee1 = argv[1];
  32                 if(argv[2]) bakapee2 = argv[2];
  33         }
  34
  35         fd = open(bakapee1,O_RDONLY|O_BINARY);
  36         if (fd < 0) {
  37                 fprintf(stderr,"Unable to open '%s'\n", bakapee1);
  38                 return 1;
  39         }
  40         {
  41                 unsigned long sz = lseek(fd,0,SEEK_END);
  42                 if (sz < sizeof(*vrl_header)) return 1;
  43                 if (sz >= 65535UL) return 1;
  44
  45                 bufsz = (unsigned int)sz;
  46                 buffer = malloc(bufsz);
  47                 if (buffer == NULL) return 1;
  48
  49                 lseek(fd,0,SEEK_SET);
  50                 if ((unsigned int)read(fd,buffer,bufsz) < bufsz) return 1;
  51
  52                 vrl_header = (struct vrl1_vgax_header*)buffer;
  53                 if (memcmp(vrl_header->vrl_sig,"VRL1",4) || memcmp(vrl_header->fmt_sig,"VGAX",4)) return 1;
  54                 if (vrl_header->width == 0 || vrl_header->height == 0) return 1;
  55         }
  56         close(fd);
  57
  58         probe_dos();
  59         if (!probe_vga()) {
  60                 printf("VGA probe failed\n");
  61                 return 1;
  62         }
  63         VGAmodeX(1, 1, &gvar);
  64
  65         /* load color palette */
  66         fd = open(bakapee2,O_RDONLY|O_BINARY);
  67         if (fd >= 0) {
  68                 unsigned int i;
  69
  70                 read(fd,palette,768);
  71                 close(fd);
  72
  73                 vga_palette_lseek(0);
  74                 for (i=0;i < 256;i++) vga_palette_write(palette[(i*3)+0]>>2,palette[(i*3)+1]>>2,palette[(i*3)+2]>>2);
  75         }
  76
  77         /* preprocess the sprite to generate line offsets */
  78         vrl_lineoffs = vrl1_vgax_genlineoffsets(vrl_header,buffer+sizeof(*vrl_header),bufsz-sizeof(*vrl_header));
  79         if (vrl_lineoffs == NULL) return 1;
  80
  81         /* setup camera and screen~ */
  82         modexHiganbanaPageSetup(&gvar.video);
  83         gvar.video.page[1].dx=gvar.video.page[0].dx=16;
  84         gvar.video.page[1].dy=gvar.video.page[0].dy=16;
  85         modexShowPage(&(gvar.video.page[0]));
  86
  87         #define VMEMHEIGHT gvar.video.page[0].height
  88         //+gvar.video.page[1].height
  89
  90         //4     this dose the screen
  91         {
  92                 unsigned int i,j,o;
  93
  94                 /* fill screen with a distinctive pattern */
  95                 for (i=0;i < gvar.video.page[0].width;i++) {
  96                         o = i >> 2;
  97                         vga_write_sequencer(0x02/*map mask*/,1 << (i&3));
  98                         for (j=0;j < VMEMHEIGHT;j++,o += gvar.video.page[0].stridew)
  99                                 vga_state.vga_graphics_ram[o] = (i^j)&15; // VRL samples put all colors in first 15!
 100                 }
 101         }
 102
 103         while (getch() != 13);
 104
 105         /* make distinctive pattern offscreen, render sprite, copy onscreen.
 106          * this time, we render the distinctive pattern to another offscreen location and just copy.
 107          * note this version is much faster too! */
 108         {
 109                 const unsigned int pattern_ofs = 0x10000UL - gvar.video.page[0].pagesize;//(gvar.video.page[0].stridew * gvar.video.page[0].height);
 110                 unsigned int i,j,o,o2;
 111                 int x,y,rx,ry,w,h;
 112                 unsigned int overdraw = 1;      // how many pixels to "overdraw" so that moving sprites with edge pixels don't leave streaks.
 113                                                 // if the sprite's edge pixels are clear anyway, you can set this to 0.
 114                 VGA_RAM_PTR omemptr;
 115                 int xdir=1,ydir=1;
 116
 117                 //4     this dose the sprite? wwww
 118                 /* fill pattern offset with a distinctive pattern */
 119                 for (i=0;i < gvar.video.page[0].width;i++) {
 120                         o = (i >> 2) + pattern_ofs;
 121                         vga_write_sequencer(0x02/*map mask*/,1 << (i&3));
 122                         for (j=0;j < VMEMHEIGHT;j++,o += gvar.video.page[0].stridew)
 123                                 vga_state.vga_graphics_ram[o] = (i^j)&15; // VRL samples put all colors in first 15!
 124                 }
 125
 126                 /* starting coords. note: this technique is limited to x coordinates of multiple of 4 */
 127                 x = 0;
 128                 y = 0;
 129
 130                 /* do it */
 131                 omemptr = vga_state.vga_graphics_ram; // save original mem ptr
 132                 while (1) {
 133                         /* stop animating if the user hits ENTER */
 134                         if (kbhit()) {
 135                                 if (getch() == 13) break;
 136                         }
 137
 138                         /* render box bounds. y does not need modification, but x and width must be multiple of 4 */
 139                         if (x >= overdraw) rx = (x - overdraw) & (~3);
 140                         else rx = -(gvar.video.page[0].dx);
 141                         if (y >= overdraw) ry = (y - overdraw);
 142                         else ry = -(gvar.video.page[0].dy);
 143                         h = vrl_header->height + overdraw + y - ry;
 144                         w = (x + vrl_header->width + (overdraw*2) + 3/*round up*/ - rx) & (~3);
 145                         if ((rx+w) > gvar.video.page[0].width) w = gvar.video.page[0].width-rx;
 146                         if ((ry+h) > VMEMHEIGHT) h = (VMEMHEIGHT)-ry;
 147
 148                         /* block copy pattern to where we will draw the sprite */
 149                         vga_setup_wm1_block_copy();
 150                         o2 = gvar.video.page[0].pagesize;
 151                         o = pattern_ofs + (ry * gvar.video.page[0].stridew) + (rx >> 2); // source offscreen
 152                         for (i=0;i < h;i++,o += gvar.video.page[0].stridew,o2 += (w >> 2)) vga_wm1_mem_block_copy(o2,o,w >> 2);
 153                         /* must restore Write Mode 0/Read Mode 0 for this code to continue drawing normally */
 154                         vga_restore_rm0wm0();
 155
 156                         /* replace VGA stride with our own and mem ptr. then sprite rendering at this stage is just (0,0) */
 157                         vga_state.vga_draw_stride_limit = (gvar.video.page[0].width + 3/*round up*/ - x) >> 2;
 158                         vga_state.vga_draw_stride = w >> 2;
 159                         vga_state.vga_graphics_ram = omemptr + gvar.video.page[0].pagesize;
 160
 161                         /* then the sprite. note modding ram ptr means we just draw to (x&3,0) */
 162                         draw_vrl1_vgax_modex(x-rx,y-ry,vrl_header,vrl_lineoffs,buffer+sizeof(*vrl_header),bufsz-sizeof(*vrl_header));
 163
 164                         /* restore ptr */
 165                         vga_state.vga_graphics_ram = omemptr;
 166
 167                         /* block copy to visible RAM from offscreen */
 168                         vga_setup_wm1_block_copy();
 169                         o = gvar.video.page[0].pagesize; // source offscreen
 170                         o2 = (ry * gvar.video.page[0].stridew) + (rx >> 2); // dest visible (original stride)
 171                         for (i=0;i < h;i++,o += vga_state.vga_draw_stride,o2 += gvar.video.page[0].stridew) vga_wm1_mem_block_copy(o2,o,w >> 2);
 172                         /* must restore Write Mode 0/Read Mode 0 for this code to continue drawing normally */
 173                         vga_restore_rm0wm0();
 174
 175                         /* restore stride */
 176                         vga_state.vga_draw_stride_limit = vga_state.vga_draw_stride = gvar.video.page[0].stridew;
 177
 178                         /* step */
 179                         x += xdir;
 180                         y += ydir;
 181                         if (x >= (gvar.video.page[0].width - 1) || x == -(gvar.video.page[0].dx))
 182                                 xdir = -xdir;
 183                         if (y >= (VMEMHEIGHT - 1) || y == -(gvar.video.page[0].dy))
 184                                 ydir = -ydir;
 185                 }
 186         }
 187
 188         while (1) {
 189                         /* stop animating if the user hits ENTER */
 190                         if (kbhit()) {
 191                                 if (getch() == 13) break;
 192                         }
 193                 modexShowPage(&(gvar.video.page[1]));
 194         }
 195
 196         while (1) {
 197                         /* stop animating if the user hits ENTER */
 198                         if (kbhit()) {
 199                                 if (getch() == 13) break;
 200                         }
 201                 modexShowPage(&(gvar.video.page[0]));
 202         }
 203
 204         /* another handy "demo" effect using VGA write mode 1.
 205          * we can take what's on screen and vertically squash it like an old analog TV set turning off. */
 206         {
 207                 unsigned int blank_line_ofs = (gvar.video.page[0].stridew * gvar.video.page[0].height * 2);
 208                 unsigned int copy_ofs = (gvar.video.page[0].stridew * gvar.video.page[0].height);
 209                 unsigned int display_ofs = 0x0000;
 210                 unsigned int i,y,soh,doh,dstart;
 211                 unsigned int dh_blankfill = 8;
 212                 unsigned int dh_step = 8;
 213                 uint32_t sh,dh,yf,ystep;
 214
 215                 /* copy active display (0) to offscreen buffer (0x4000) */
 216                 vga_state.vga_draw_stride_limit = vga_state.vga_draw_stride = gvar.video.page[0].stridew;
 217                 vga_setup_wm1_block_copy();
 218                 vga_wm1_mem_block_copy(copy_ofs,display_ofs,gvar.video.page[0].stridew * gvar.video.page[0].height);
 219                 vga_restore_rm0wm0();
 220
 221                 /* need a blank line as well */
 222                 for (i=0;i < gvar.video.page[0].stridew;i++) vga_state.vga_graphics_ram[i+blank_line_ofs] = 0;
 223
 224                 sh = dh = gvar.video.page[0].height;
 225                 while (dh >= dh_step) {
 226                         /* stop animating if the user hits ENTER */
 227                         if (kbhit()) {
 228                                 if (getch() == 13) break;
 229                         }
 230
 231                         /* wait for vsync end */
 232                         vga_wait_for_vsync_end();
 233
 234                         /* what scalefactor to use for stretching? */
 235                         ystep = (0x10000UL * sh) / dh;
 236                         dstart = (gvar.video.page[0].height - dh) / 2; // center the squash effect on screen, otherwise it would squash to top of screen
 237                         doh = display_ofs;
 238                         soh = copy_ofs;
 239                         yf = 0;
 240                         y = 0;
 241
 242                         /* for performance, keep VGA in write mode 1 the entire render */
 243                         vga_setup_wm1_block_copy();
 244
 245                         /* blank lines */
 246                         if (dstart >= dh_blankfill) y = dstart - dh_blankfill;
 247                         else y = 0;
 248                         doh = gvar.video.page[0].stridew * y;
 249
 250                         while (y < dstart) {
 251                                 vga_wm1_mem_block_copy(doh,blank_line_ofs,gvar.video.page[0].stridew);
 252                                 doh += gvar.video.page[0].stridew;
 253                                 y++;
 254                         }
 255
 256                         /* draw */
 257                         while (y < (dh+dstart)) {
 258                                 soh = copy_ofs + ((yf >> 16UL) * gvar.video.page[0].stridew);
 259                                 vga_wm1_mem_block_copy(doh,soh,gvar.video.page[0].stridew);
 260                                 doh += gvar.video.page[0].stridew;
 261                                 yf += ystep;
 262                                 y++;
 263                         }
 264
 265                         /* blank lines */
 266                         while (y < gvar.video.page[0].height && y < (dh+dstart+dh_blankfill)) {
 267                                 vga_wm1_mem_block_copy(doh,blank_line_ofs,gvar.video.page[0].stridew);
 268                                 doh += gvar.video.page[0].stridew;
 269                                 y++;
 270                         }
 271
 272                         /* done */
 273                         vga_restore_rm0wm0();
 274
 275                         /* wait for vsync */
 276                         vga_wait_for_vsync();
 277
 278                         /* make it shrink */
 279                         dh -= dh_step;
 280                         if (dh < 40) dh_step = 1;
 281                 }
 282         }
 283
 284         VGAmodeX(0, 1, &gvar);
 285         free(vrl_lineoffs);
 286         buffer = NULL;
 287         free(buffer);
 288         bufsz = 0;
 289         return 0;
 290 }