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 void modexvrlwm1global_game_variables_t *gvar, int x, y, rx, ry, w, h, )
  15 {
  16                         /* block copy pattern to where we will draw the sprite */
  17                         vga_setup_wm1_block_copy();
  18                         o2 = gvar->video.page[0].pagesize;
  19                         o = pattern_ofs + (ry * gvar->video.page[0].stridew) + (rx >> 2); // source offscreen
  20                         for (i=0;i < h;i++,o += gvar->video.page[0].stridew,o2 += (w >> 2)) vga_wm1_mem_block_copy(o2,o,w >> 2);
  21                         /* must restore Write Mode 0/Read Mode 0 for this code to continue drawing normally */
  22                         vga_restore_rm0wm0();
  23
  24                         /* replace VGA stride with our own and mem ptr. then sprite rendering at this stage is just (0,0) */
  25                         vga_state.vga_draw_stride_limit = (gvar->video.page[0].width + 3/*round up*/ - x) >> 2;
  26                         vga_state.vga_draw_stride = w >> 2;
  27                         vga_state.vga_graphics_ram = omemptr + gvar->video.page[0].pagesize;
  28
  29                         /* then the sprite. note modding ram ptr means we just draw to (x&3,0) */
  30                         draw_vrl1_vgax_modex(x-rx,y-ry,vrl_header,vrl_lineoffs,buffer+sizeof(*vrl_header),bufsz-sizeof(*vrl_header));
  31
  32                         /* restore ptr */
  33                         vga_state.vga_graphics_ram = omemptr;
  34
  35                         /* block copy to visible RAM from offscreen */
  36                         vga_setup_wm1_block_copy();
  37                         o = gvar->video.page[0].pagesize; // source offscreen
  38                         o2 = (ry * gvar->video.page[0].stridew) + (rx >> 2); // dest visible (original stride)
  39                         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);
  40                         /* must restore Write Mode 0/Read Mode 0 for this code to continue drawing normally */
  41                         vga_restore_rm0wm0();
  42
  43                         /* restore stride */
  44                         vga_state.vga_draw_stride_limit = vga_state.vga_draw_stride = gvar->video.page[0].stridew;
  45 }
  46
  47 int main(int argc,char **argv) {
  48         struct vrl1_vgax_header *vrl_header;
  49         vrl1_vgax_offset_t *vrl_lineoffs;
  50         unsigned char *buffer;
  51         unsigned int bufsz;
  52         int fd;
  53         char *bakapee1,*bakapee2;
  54
  55         bakapee1=malloc(64);
  56         bakapee2=malloc(1024);
  57
  58         if (argc < 3) {
  59                 fprintf(stderr,"drawvrl <VRL file> <palette file>\n");
  60                 bakapee1 = FILENAME_1;//"data/aconita.vrl";
  61                 bakapee2 = FILENAME_2;//"data/aconita.pal";
  62                 //return 1;
  63         }else{
  64                 if(argv[1]) bakapee1 = argv[1];
  65                 if(argv[2]) bakapee2 = argv[2];
  66         }
  67
  68         fd = open(bakapee1,O_RDONLY|O_BINARY);
  69         if (fd < 0) {
  70                 fprintf(stderr,"Unable to open '%s'\n", bakapee1);
  71                 return 1;
  72         }
  73         {
  74                 unsigned long sz = lseek(fd,0,SEEK_END);
  75                 if (sz < sizeof(*vrl_header)) return 1;
  76                 if (sz >= 65535UL) return 1;
  77
  78                 bufsz = (unsigned int)sz;
  79                 buffer = malloc(bufsz);
  80                 if (buffer == NULL) return 1;
  81
  82                 lseek(fd,0,SEEK_SET);
  83                 if ((unsigned int)read(fd,buffer,bufsz) < bufsz) return 1;
  84
  85                 vrl_header = (struct vrl1_vgax_header*)buffer;
  86                 if (memcmp(vrl_header->vrl_sig,"VRL1",4) || memcmp(vrl_header->fmt_sig,"VGAX",4)) return 1;
  87                 if (vrl_header->width == 0 || vrl_header->height == 0) return 1;
  88         }
  89         close(fd);
  90
  91         probe_dos();
  92         if (!probe_vga()) {
  93                 printf("VGA probe failed\n");
  94                 return 1;
  95         }
  96         VGAmodeX(1, 1, &gvar);
  97
  98         /* load color palette */
  99         fd = open(bakapee2,O_RDONLY|O_BINARY);
 100         if (fd >= 0) {
 101                 unsigned int i;
 102
 103                 read(fd,palette,768);
 104                 close(fd);
 105
 106                 vga_palette_lseek(0);
 107                 for (i=0;i < 256;i++) vga_palette_write(palette[(i*3)+0]>>2,palette[(i*3)+1]>>2,palette[(i*3)+2]>>2);
 108         }
 109
 110         /* preprocess the sprite to generate line offsets */
 111         vrl_lineoffs = vrl1_vgax_genlineoffsets(vrl_header,buffer+sizeof(*vrl_header),bufsz-sizeof(*vrl_header));
 112         if (vrl_lineoffs == NULL) return 1;
 113
 114         /* setup camera and screen~ */
 115         modexHiganbanaPageSetup(&gvar.video);
 116         gvar.video.page[1].dx=gvar.video.page[0].dx=16;
 117         gvar.video.page[1].dy=gvar.video.page[0].dy=16;
 118         modexShowPage(&(gvar.video.page[0]));
 119
 120         #define VMEMHEIGHT gvar.video.page[0].height+gvar.video.page[1].height
 121
 122         //4     this dose the screen
 123         {
 124                 unsigned int i,j,o;
 125                 /* fill screen with a distinctive pattern */
 126                 for (i=0;i < gvar.video.page[0].width;i++) {
 127                         o = i >> 2;
 128                         vga_write_sequencer(0x02/*map mask*/,1 << (i&3));
 129                         for (j=0;j < VMEMHEIGHT;j++,o += gvar.video.page[0].stridew)
 130                                 vga_state.vga_graphics_ram[o] = (i^j)&15; // VRL samples put all colors in first 15!
 131                 }
 132         }
 133
 134         //while (getch() != 13);
 135
 136         /* make distinctive pattern offscreen, render sprite, copy onscreen.
 137          * this time, we render the distinctive pattern to another offscreen location and just copy.
 138          * note this version is much faster too! */
 139         {
 140                 const unsigned int pattern_ofs = 0x10000UL - gvar.video.page[0].pagesize;//(gvar.video.page[0].stridew * gvar.video.page[0].height);
 141                 unsigned int i,j,o,o2;
 142                 int x,y,rx,ry,w,h;
 143                 unsigned int overdraw = 1;      // how many pixels to "overdraw" so that moving sprites with edge pixels don't leave streaks.
 144                                                 // if the sprite's edge pixels are clear anyway, you can set this to 0.
 145                 VGA_RAM_PTR omemptr;
 146                 int xdir=1,ydir=1;
 147
 148                 //4     this dose the sprite? wwww
 149                 /* fill pattern offset with a distinctive pattern */
 150                 for (i=0;i < gvar.video.page[0].width;i++) {
 151                         o = (i >> 2) + pattern_ofs;
 152                         vga_write_sequencer(0x02/*map mask*/,1 << (i&3));
 153                         for (j=0;j < VMEMHEIGHT;j++,o += gvar.video.page[0].stridew)
 154                                 vga_state.vga_graphics_ram[o] = (i^j)&15; // VRL samples put all colors in first 15!
 155                 }
 156
 157                 /* starting coords. note: this technique is limited to x coordinates of multiple of 4 */
 158                 x = 0;
 159                 y = 0;
 160
 161                 /* do it */
 162                 omemptr = vga_state.vga_graphics_ram; // save original mem ptr
 163                 while (1) {
 164                         /* stop animating if the user hits ENTER */
 165                         if (kbhit()) {
 166                                 if (getch() == 13) break;
 167                         }
 168
 169                         /* render box bounds. y does not need modification, but x and width must be multiple of 4 */
 170                         if (x >= overdraw) rx = (x - overdraw) & (~3);
 171                         else rx = -(gvar.video.page[0].dx);
 172                         if (y >= overdraw) ry = (y - overdraw);
 173                         else ry = -(gvar.video.page[0].dy);
 174                         h = vrl_header->height + overdraw + y - ry;
 175                         w = (x + vrl_header->width + (overdraw*2) + 3/*round up*/ - rx) & (~3);
 176                         if ((rx+w) > gvar.video.page[0].width) w = gvar.video.page[0].width-rx;
 177                         if ((ry+h) > gvar.video.page[0].height) h = (gvar.video.page[0].height)-ry;
 178
 179
 180
 181                         /* step */
 182                         x += xdir;
 183                         y += ydir;
 184                         if (x >= (gvar.video.page[0].width - 1) || x == -(gvar.video.page[0].dx))
 185                                 xdir = -xdir;
 186                         if (y >= (gvar.video.page[0].height - 1) || y == -(gvar.video.page[0].dy))
 187                                 ydir = -ydir;
 188                 }
 189         }
 190
 191         while (1) {
 192                         /* stop animating if the user hits ENTER */
 193                         if (kbhit()) {
 194                                 if (getch() == 13) break;
 195                         }
 196                 modexShowPage(&(gvar.video.page[1]));
 197         }
 198
 199         while (1) {
 200                         /* stop animating if the user hits ENTER */
 201                         if (kbhit()) {
 202                                 if (getch() == 13) break;
 203                         }
 204                 modexShowPage(&(gvar.video.page[0]));
 205         }
 206
 207         /* another handy "demo" effect using VGA write mode 1.
 208          * we can take what's on screen and vertically squash it like an old analog TV set turning off. */
 209         {
 210                 unsigned int blank_line_ofs = (gvar.video.page[0].stridew * gvar.video.page[0].height * 2);
 211                 unsigned int copy_ofs = (gvar.video.page[0].stridew * gvar.video.page[0].height);
 212                 unsigned int display_ofs = 0x0000;
 213                 unsigned int i,y,soh,doh,dstart;
 214                 unsigned int dh_blankfill = 8;
 215                 unsigned int dh_step = 8;
 216                 uint32_t sh,dh,yf,ystep;
 217
 218                 /* copy active display (0) to offscreen buffer (0x4000) */
 219                 vga_state.vga_draw_stride_limit = vga_state.vga_draw_stride = gvar.video.page[0].stridew;
 220                 vga_setup_wm1_block_copy();
 221                 vga_wm1_mem_block_copy(copy_ofs,display_ofs,gvar.video.page[0].stridew * gvar.video.page[0].height);
 222                 vga_restore_rm0wm0();
 223
 224                 /* need a blank line as well */
 225                 for (i=0;i < gvar.video.page[0].stridew;i++) vga_state.vga_graphics_ram[i+blank_line_ofs] = 0;
 226
 227                 sh = dh = gvar.video.page[0].height;
 228                 while (dh >= dh_step) {
 229                         /* stop animating if the user hits ENTER */
 230                         if (kbhit()) {
 231                                 if (getch() == 13) break;
 232                         }
 233
 234                         /* wait for vsync end */
 235                         vga_wait_for_vsync_end();
 236
 237                         /* what scalefactor to use for stretching? */
 238                         ystep = (0x10000UL * sh) / dh;
 239                         dstart = (gvar.video.page[0].height - dh) / 2; // center the squash effect on screen, otherwise it would squash to top of screen
 240                         doh = display_ofs;
 241                         soh = copy_ofs;
 242                         yf = 0;
 243                         y = 0;
 244
 245                         /* for performance, keep VGA in write mode 1 the entire render */
 246                         vga_setup_wm1_block_copy();
 247
 248                         /* blank lines */
 249                         if (dstart >= dh_blankfill) y = dstart - dh_blankfill;
 250                         else y = 0;
 251                         doh = gvar.video.page[0].stridew * y;
 252
 253                         while (y < dstart) {
 254                                 vga_wm1_mem_block_copy(doh,blank_line_ofs,gvar.video.page[0].stridew);
 255                                 doh += gvar.video.page[0].stridew;
 256                                 y++;
 257                         }
 258
 259                         /* draw */
 260                         while (y < (dh+dstart)) {
 261                                 soh = copy_ofs + ((yf >> 16UL) * gvar.video.page[0].stridew);
 262                                 vga_wm1_mem_block_copy(doh,soh,gvar.video.page[0].stridew);
 263                                 doh += gvar.video.page[0].stridew;
 264                                 yf += ystep;
 265                                 y++;
 266                         }
 267
 268                         /* blank lines */
 269                         while (y < gvar.video.page[0].height && y < (dh+dstart+dh_blankfill)) {
 270                                 vga_wm1_mem_block_copy(doh,blank_line_ofs,gvar.video.page[0].stridew);
 271                                 doh += gvar.video.page[0].stridew;
 272                                 y++;
 273                         }
 274
 275                         /* done */
 276                         vga_restore_rm0wm0();
 277
 278                         /* wait for vsync */
 279                         vga_wait_for_vsync();
 280
 281                         /* make it shrink */
 282                         dh -= dh_step;
 283                         if (dh < 40) dh_step = 1;
 284                 }
 285         }
 286
 287         VGAmodeX(0, 1, &gvar);
 288         free(vrl_lineoffs);
 289         buffer = NULL;
 290         free(buffer);
 291         bufsz = 0;
 292         return 0;
 293 }