git.mutantstargoat.com Git - dosdemo/blob - src/demo.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <math.h>
   5 #include <errno.h>
   6 #include <limits.h>
   7 #include "demo.h"
   8 #include "screen.h"
   9
  10 int fb_width = 320;
  11 int fb_height = 240;
  12 int fb_bpp = 16;
  13 void *fb_pixels;
  14 unsigned long time_msec;
  15 int mouse_x, mouse_y;
  16 unsigned int mouse_bmask;
  17
  18 static unsigned long nframes;
  19 static const char *start_scr_name;
  20
  21 int demo_init(int argc, char **argv)
  22 {
  23         struct screen *scr;
  24
  25         if(argv[1]) {
  26                 start_scr_name = argv[1];
  27         }
  28
  29         if(scr_init() == -1) {
  30                 return -1;
  31         }
  32         if(start_scr_name) {
  33                 scr = scr_lookup(start_scr_name);
  34         } else {
  35                 scr = scr_screen(0);
  36         }
  37
  38         if(!scr || scr_change(scr, 4000) == -1) {
  39                 fprintf(stderr, "screen %s not found\n", start_scr_name ? start_scr_name : "0");
  40                 return -1;
  41         }
  42
  43         /* clear the framebuffer at least once */
  44         memset(fb_pixels, 0, fb_width * fb_height * fb_bpp / CHAR_BIT);
  45         return 0;
  46 }
  47
  48 void demo_cleanup(void)
  49 {
  50         scr_shutdown();
  51
  52         if(time_msec) {
  53                 float fps = (float)nframes / ((float)time_msec / 1000.0f);
  54                 printf("average framerate: %.1f\n", fps);
  55         }
  56 }
  57
  58 void demo_draw(void)
  59 {
  60         scr_update();
  61         scr_draw();
  62
  63         ++nframes;
  64 }
  65
  66 void demo_keyboard(int key, int state)
  67 {
  68         if(state) {
  69                 switch(key) {
  70                 case 27:
  71                         demo_quit();
  72                         break;
  73
  74                 default:
  75                         if(key >= '1' && key <= '1' + scr_num_screens()) {
  76                                 int idx = key - '1';
  77                                 printf("change screen %d\n", idx);
  78                                 scr_change(scr_screen(idx), 4000);
  79                         }
  80                         break;
  81                 }
  82         }
  83 }