git.mutantstargoat.com Git - vidsys/blob - main.c

   1 #include <stdio.h>
   2 #include <math.h>
   3 #include <limits.h>
   4 #include <conio.h>
   5 #include "vidsys.h"
   6
   7 void test8bpp(void);
   8
   9 struct vid_modeinfo *vm;
  10 void *vmem;
  11
  12 static const char *usage_fmt = "Usage %s: [options]\n"
  13         "Options:      \n"
  14         " -s <XxY>: video resolution\n"
  15         " -b <bpp>: color depth\n";
  16
  17 int main(int argc, char **argv)
  18 {
  19         int i;
  20         int mode;
  21         int xres = 640;
  22         int yres = 480;
  23         int bpp = 8;
  24
  25         for(i=1; i<argc; i++) {
  26                 if(argv[i][0] == '-') {
  27                         if(argv[i][2]) {
  28 invalopt:               fprintf(stderr, "invalid option: %s\n", argv[i]);
  29                                 return 1;
  30                         }
  31                         switch(argv[i][1]) {
  32                         case 's':
  33                                 if(!argv[++i] || sscanf(argv[i], "%dx%d", &xres, &yres) != 2) {
  34                                         fprintf(stderr, "invalid resolution: %s\n", argv[i]);
  35                                         return 1;
  36                                 }
  37                                 break;
  38
  39                         case 'b':
  40                                 if(!argv[++i] || (bpp = atoi(argv[i])) <= 0) {
  41                                         fprintf(stderr, "invalid color depth: %s\n", argv[i]);
  42                                         return 1;
  43                                 }
  44
  45                         case 'h':
  46                                 printf(usage_fmt, argv[0]);
  47                                 return 0;
  48
  49                         default:
  50                                 goto invalopt;
  51                         }
  52                 } else {
  53                         fprintf(stderr, "unexpected argument: %s\n", argv[i]);
  54                         return 1;
  55                 }
  56         }
  57
  58
  59         if(vid_init() == -1) {
  60                 fprintf(stderr, "failed to initialize video\n");
  61                 return 1;
  62         }
  63         printf("press any key...\n");
  64         getch();
  65
  66         if((mode = vid_findmode(xres, yres, bpp)) == -1) {
  67                 fprintf(stderr, "failed to find video mode: %dx%d %dbpp\n", xres, yres, bpp);
  68                 return 1;
  69         }
  70         if(!(vmem = vid_setmode(mode))) {
  71                 fprintf(stderr, "failed to set video mode %04x\n", mode);
  72                 return 1;
  73         }
  74         vm = vid_modeinfo(mode);
  75
  76         switch(vm->bpp) {
  77         case 8:
  78                 test8bpp();
  79                 break;
  80
  81         default:
  82                 break;
  83         }
  84
  85         for(;;) {
  86                 while(kbhit()) {
  87                         if(getch() == 27) {
  88                                 goto end;
  89                         }
  90                 }
  91         }
  92
  93 end:
  94         vid_setmode(3);
  95         vid_cleanup();
  96         return 0;
  97 }
  98
  99 static float fmin(float a, float b)
 100 {
 101         return a < b ? a : b;
 102 }
 103
 104 #define PI              3.14159265
 105 #define TWO_PI  (PI * 2.0f)
 106
 107 void test8bpp(void)
 108 {
 109         int i, j;
 110         unsigned char *fb;
 111         struct vid_color cmap[256];
 112         int winsz, winleft, winpos;
 113
 114         for(i=0; i<256; i++) {
 115                 float x = (float)i / (256.0f / TWO_PI);
 116                 cmap[i].r = (int)fmin(0.0f, sin(x) * 255.0f);
 117                 cmap[i].g = (int)fmin(0.0f, sin(x - PI) * 255.0f);
 118                 cmap[i].b = (int)fmin(0.0f, cos(x - TWO_PI) * 255.0f);
 119         }
 120         vid_setpal(0, 256, cmap);
 121
 122         if(vid_islinear()) {
 123                 winsz = INT_MAX;
 124         } else {
 125                 winsz = 65536;
 126                 winpos = 0;
 127                 vid_setwin(0, 0);
 128         }
 129         winleft = winsz;
 130         fb = vmem;
 131
 132         vid_vsync();
 133
 134         for(i=0; i<vm->height; i++) {
 135                 for(j=0; j<vm->width; j++) {
 136                         if(winleft-- <= 0) {
 137                                 winpos += vm->win_step;
 138                                 vid_setwin(0, winpos);
 139                                 winleft = winsz;
 140                                 fb = vmem;
 141                         }
 142                         *fb++ = i ^ j;
 143                 }
 144         }
 145 }