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
  13 int main(int argc,char **argv) {
  14         struct vrl1_vgax_header *vrl_header;
  15         vrl1_vgax_offset_t *vrl_lineoffs;
  16         unsigned char *buffer;
  17         unsigned int bufsz;
  18         int fd;
  19         char *bakapee1,*bakapee2;
  20
  21         bakapee1=malloc(64);
  22         bakapee2=malloc(1024);
  23
  24         if (argc < 3) {
  25                 fprintf(stderr,"drawvrl <VRL file> <palette file>\n");
  26                 bakapee1 = FILENAME_1;//"data/aconita.vrl";
  27                 bakapee2 = FILENAME_2;//"data/aconita.pal";
  28                 //return 1;
  29         }else{
  30                 if(argv[1]) bakapee1 = argv[1];
  31                 if(argv[2]) bakapee2 = argv[2];
  32         }
  33
  34         fd = open(bakapee1,O_RDONLY|O_BINARY);
  35         if (fd < 0) {
  36                 fprintf(stderr,"Unable to open '%s'\n", bakapee1);
  37                 return 1;
  38         }
  39         {
  40                 unsigned long sz = lseek(fd,0,SEEK_END);
  41                 if (sz < sizeof(*vrl_header)) return 1;
  42                 if (sz >= 65535UL) return 1;
  43
  44                 bufsz = (unsigned int)sz;
  45                 buffer = malloc(bufsz);
  46                 if (buffer == NULL) return 1;
  47
  48                 lseek(fd,0,SEEK_SET);
  49                 if ((unsigned int)read(fd,buffer,bufsz) < bufsz) return 1;
  50
  51                 vrl_header = (struct vrl1_vgax_header*)buffer;
  52                 if (memcmp(vrl_header->vrl_sig,"VRL1",4) || memcmp(vrl_header->fmt_sig,"VGAX",4)) return 1;
  53                 if (vrl_header->width == 0 || vrl_header->height == 0) return 1;
  54         }
  55         close(fd);
  56
  57         probe_dos();
  58         if (!probe_vga()) {
  59                 printf("VGA probe failed\n");
  60                 return 1;
  61         }
  62         int10_setmode(19);
  63         update_state_from_vga();
  64         vga_enable_256color_modex(); // VGA mode X
  65         vga_state.vga_width = 320; // VGA lib currently does not update this
  66         vga_state.vga_height = 240; // VGA lib currently does not update this
  67
  68 //#if 1 // 320x240 test mode: this is how Project 16 is using our code, enable for test case
  69         {
  70                 struct vga_mode_params cm;
  71
  72                 vga_read_crtc_mode(&cm);
  73
  74                 // 320x240 mode 60Hz
  75                 cm.vertical_total = 525;
  76                 cm.vertical_start_retrace = 0x1EA;
  77                 cm.vertical_end_retrace = 0x1EC;
  78                 cm.vertical_display_end = 480;
  79                 cm.vertical_blank_start = 489;
  80                 cm.vertical_blank_end = 517;
  81
  82                 vga_write_crtc_mode(&cm,0);
  83         }
  84         vga_state.vga_height = 240; // VGA lib currently does not update this
  85 //#endif
  86
  87         /* load color palette */
  88         fd = open(bakapee2,O_RDONLY|O_BINARY);
  89         if (fd >= 0) {
  90                 unsigned int i;
  91
  92                 read(fd,palette,768);
  93                 close(fd);
  94
  95                 vga_palette_lseek(0);
  96                 for (i=0;i < 256;i++) vga_palette_write(palette[(i*3)+0]>>2,palette[(i*3)+1]>>2,palette[(i*3)+2]>>2);
  97         }
  98
  99         /* preprocess the sprite to generate line offsets */
 100         vrl_lineoffs = vrl1_vgax_genlineoffsets(vrl_header,buffer+sizeof(*vrl_header),bufsz-sizeof(*vrl_header));
 101         if (vrl_lineoffs == NULL) return 1;
 102
 103         //4     this dose the screen
 104         {
 105                 unsigned int i,j,o;
 106
 107                 /* fill screen with a distinctive pattern */
 108                 for (i=0;i < vga_state.vga_width;i++) {
 109                         o = i >> 2;
 110                         vga_write_sequencer(0x02/*map mask*/,1 << (i&3));
 111                         for (j=0;j < vga_state.vga_height;j++,o += vga_state.vga_stride)
 112                                 vga_state.vga_graphics_ram[o] = (i^j)&15; // VRL samples put all colors in first 15!
 113                 }
 114         }
 115
 116         //draw_vrl1_vgax_modex(0/*x-rx*/,0/*y-ry*/,vrl_header,vrl_lineoffs,buffer+sizeof(*vrl_header),bufsz-sizeof(*vrl_header));
 117
 118         /* make distinctive pattern offscreen, render sprite, copy onscreen.
 119          * this time, we render the distinctive pattern to another offscreen location and just copy.
 120          * note this version is much faster too! */
 121         {
 122                 const unsigned int offscreen_ofs = (vga_state.vga_stride * vga_state.vga_height);
 123                 const unsigned int pattern_ofs = 0x10000UL - (vga_state.vga_stride * vga_state.vga_height);
 124                 unsigned int i,j,o,o2,x,y,rx,ry,w,h;
 125                 unsigned int overdraw = 1;      // how many pixels to "overdraw" so that moving sprites with edge pixels don't leave streaks.
 126                                                 // if the sprite's edge pixels are clear anyway, you can set this to 0.
 127                 VGA_RAM_PTR omemptr;
 128                 int xdir=1,ydir=1;
 129
 130                 //4     this dose the sprite? wwww
 131                 /* fill pattern offset with a distinctive pattern */
 132                 for (i=0;i < vga_state.vga_width;i++) {
 133                         o = (i >> 2) + pattern_ofs;
 134                         vga_write_sequencer(0x02/*map mask*/,1 << (i&3));
 135                         for (j=0;j < vga_state.vga_height;j++,o += vga_state.vga_stride)
 136                                 vga_state.vga_graphics_ram[o] = (i^j)&15; // VRL samples put all colors in first 15!
 137                 }
 138
 139                 /* starting coords. note: this technique is limited to x coordinates of multiple of 4 */
 140                 x = 0;
 141                 y = 0;
 142
 143                 /* do it */
 144                 omemptr = vga_state.vga_graphics_ram; // save original mem ptr
 145                 while (1) {
 146                         /* stop animating if the user hits ENTER */
 147                         if (kbhit()) {
 148                                 if (getch() == 13) break;
 149                         }
 150
 151                         /* render box bounds. y does not need modification, but x and width must be multiple of 4 */
 152                         if (x >= overdraw) rx = (x - overdraw) & (~3);
 153                         else rx = 0;
 154                         if (y >= overdraw) ry = (y - overdraw);
 155                         else ry = 0;
 156                         h = vrl_header->height + overdraw + y - ry;
 157                         w = (x + vrl_header->width + (overdraw*2) + 3/*round up*/ - rx) & (~3);
 158                         if ((rx+w) > vga_state.vga_width) w = vga_state.vga_width-rx;
 159                         if ((ry+h) > vga_state.vga_height) h = vga_state.vga_height-ry;
 160
 161                         /* block copy pattern to where we will draw the sprite */
 162                         vga_setup_wm1_block_copy();
 163                         o2 = offscreen_ofs;
 164                         o = pattern_ofs + (ry * vga_state.vga_stride) + (rx >> 2); // source offscreen
 165                         for (i=0;i < h;i++,o += vga_state.vga_stride,o2 += (w >> 2)) vga_wm1_mem_block_copy(o2,o,w >> 2);
 166                         /* must restore Write Mode 0/Read Mode 0 for this code to continue drawing normally */
 167                         vga_restore_rm0wm0();
 168
 169                         /* replace VGA stride with our own and mem ptr. then sprite rendering at this stage is just (0,0) */
 170                         vga_state.vga_draw_stride_limit = (vga_state.vga_width + 3/*round up*/ - x) >> 2;
 171                         vga_state.vga_draw_stride = w >> 2;
 172                         vga_state.vga_graphics_ram = omemptr + offscreen_ofs;
 173
 174                         /* then the sprite. note modding ram ptr means we just draw to (x&3,0) */
 175                         draw_vrl1_vgax_modex(x-rx,y-ry,vrl_header,vrl_lineoffs,buffer+sizeof(*vrl_header),bufsz-sizeof(*vrl_header));
 176
 177                         /* restore ptr */
 178                         vga_state.vga_graphics_ram = omemptr;
 179
 180                         /* block copy to visible RAM from offscreen */
 181                         vga_setup_wm1_block_copy();
 182                         o = offscreen_ofs; // source offscreen
 183                         o2 = (ry * vga_state.vga_stride) + (rx >> 2); // dest visible (original stride)
 184                         for (i=0;i < h;i++,o += vga_state.vga_draw_stride,o2 += vga_state.vga_stride) vga_wm1_mem_block_copy(o2,o,w >> 2);
 185                         /* must restore Write Mode 0/Read Mode 0 for this code to continue drawing normally */
 186                         vga_restore_rm0wm0();
 187
 188                         /* restore stride */
 189                         vga_state.vga_draw_stride_limit = vga_state.vga_draw_stride = vga_state.vga_stride;
 190
 191                         /* step */
 192                         x += xdir;
 193                         y += ydir;
 194                         if (x >= (vga_state.vga_width - 1) || x == 0)
 195                                 xdir = -xdir;
 196                         if (y >= (vga_state.vga_height - 1) || y == 0)
 197                                 ydir = -ydir;
 198                 }
 199         }
 200
 201         /* another handy "demo" effect using VGA write mode 1.
 202          * we can take what's on screen and vertically squash it like an old analog TV set turning off. */
 203         {
 204                 unsigned int blank_line_ofs = (vga_state.vga_stride * vga_state.vga_height * 2);
 205                 unsigned int copy_ofs = (vga_state.vga_stride * vga_state.vga_height);
 206                 unsigned int display_ofs = 0x0000;
 207                 unsigned int i,y,soh,doh,dstart;
 208                 unsigned int dh_blankfill = 8;
 209                 unsigned int dh_step = 8;
 210                 uint32_t sh,dh,yf,ystep;
 211
 212                 /* copy active display (0) to offscreen buffer (0x4000) */
 213                 vga_state.vga_draw_stride_limit = vga_state.vga_draw_stride = vga_state.vga_stride;
 214                 vga_setup_wm1_block_copy();
 215                 vga_wm1_mem_block_copy(copy_ofs,display_ofs,vga_state.vga_stride * vga_state.vga_height);
 216                 vga_restore_rm0wm0();
 217
 218                 /* need a blank line as well */
 219                 for (i=0;i < vga_state.vga_stride;i++) vga_state.vga_graphics_ram[i+blank_line_ofs] = 0;
 220
 221                 sh = dh = vga_state.vga_height;
 222                 while (dh >= dh_step) {
 223                         /* stop animating if the user hits ENTER */
 224                         if (kbhit()) {
 225                                 if (getch() == 13) break;
 226                         }
 227
 228                         /* wait for vsync end */
 229                         vga_wait_for_vsync_end();
 230
 231                         /* what scalefactor to use for stretching? */
 232                         ystep = (0x10000UL * sh) / dh;
 233                         dstart = (vga_state.vga_height - dh) / 2; // center the squash effect on screen, otherwise it would squash to top of screen
 234                         doh = display_ofs;
 235                         soh = copy_ofs;
 236                         yf = 0;
 237                         y = 0;
 238
 239                         /* for performance, keep VGA in write mode 1 the entire render */
 240                         vga_setup_wm1_block_copy();
 241
 242                         /* blank lines */
 243                         if (dstart >= dh_blankfill) y = dstart - dh_blankfill;
 244                         else y = 0;
 245                         doh = vga_state.vga_stride * y;
 246
 247                         while (y < dstart) {
 248                                 vga_wm1_mem_block_copy(doh,blank_line_ofs,vga_state.vga_stride);
 249                                 doh += vga_state.vga_stride;
 250                                 y++;
 251                         }
 252
 253                         /* draw */
 254                         while (y < (dh+dstart)) {
 255                                 soh = copy_ofs + ((yf >> 16UL) * vga_state.vga_stride);
 256                                 vga_wm1_mem_block_copy(doh,soh,vga_state.vga_stride);
 257                                 doh += vga_state.vga_stride;
 258                                 yf += ystep;
 259                                 y++;
 260                         }
 261
 262                         /* blank lines */
 263                         while (y < vga_state.vga_height && y < (dh+dstart+dh_blankfill)) {
 264                                 vga_wm1_mem_block_copy(doh,blank_line_ofs,vga_state.vga_stride);
 265                                 doh += vga_state.vga_stride;
 266                                 y++;
 267                         }
 268
 269                         /* done */
 270                         vga_restore_rm0wm0();
 271
 272                         /* wait for vsync */
 273                         vga_wait_for_vsync();
 274
 275                         /* make it shrink */
 276                         dh -= dh_step;
 277                         if (dh < 40) dh_step = 1;
 278                 }
 279         }
 280
 281         int10_setmode(3);
 282         free(vrl_lineoffs);
 283         buffer = NULL;
 284         free(buffer);
 285         bufsz = 0;
 286         return 0;
 287 }