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 <ctype.h>
   6 #include <errno.h>
   7 #include <limits.h>
   8 #include "demo.h"
   9 #include "screen.h"
  10 #include "3dgfx.h"
  11 #include "music.h"
  12 #include "cfgopt.h"
  13 #include "tinyfps.h"
  14
  15 int fb_width = 320;
  16 int fb_height = 240;
  17 int fb_bpp = 16;
  18 uint16_t *fb_pixels, *vmem_back, *vmem_front;
  19 unsigned long time_msec;
  20 int mouse_x, mouse_y;
  21 unsigned int mouse_bmask;
  22
  23 float sball_matrix[] = {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1};
  24
  25 static unsigned long nframes;
  26
  27 int demo_init(int argc, char **argv)
  28 {
  29         struct screen *scr;
  30         char *env;
  31
  32         if(load_config("demo.cfg") == -1) {
  33                 return -1;
  34         }
  35         if((env = getenv("START_SCR"))) {
  36                 opt.start_scr = env;
  37         }
  38         if(parse_args(argc, argv) == -1) {
  39                 return -1;
  40         }
  41
  42         initFpsFonts();
  43
  44         if(g3d_init() == -1) {
  45                 return -1;
  46         }
  47         g3d_framebuffer(fb_width, fb_height, fb_pixels);
  48
  49         if(opt.music) {
  50                 if(music_open("data/test.mod") == -1) {
  51                         return -1;
  52                 }
  53         }
  54
  55         if(scr_init() == -1) {
  56                 return -1;
  57         }
  58         if(opt.start_scr) {
  59                 scr = scr_lookup(opt.start_scr);
  60         } else {
  61                 scr = scr_screen(0);
  62         }
  63
  64         if(!scr || scr_change(scr, 4000) == -1) {
  65                 fprintf(stderr, "screen %s not found\n", opt.start_scr ? opt.start_scr : "0");
  66                 return -1;
  67         }
  68
  69         /* clear the framebuffer at least once */
  70         memset(fb_pixels, 0, fb_width * fb_height * fb_bpp / CHAR_BIT);
  71
  72         if(opt.music) {
  73                 music_play();
  74         }
  75         return 0;
  76 }
  77
  78 void demo_cleanup(void)
  79 {
  80         if(opt.music) {
  81                 music_close();
  82         }
  83         scr_shutdown();
  84         g3d_destroy();
  85
  86         if(time_msec) {
  87                 float fps = (float)nframes / ((float)time_msec / 1000.0f);
  88                 printf("average framerate: %.1f\n", fps);
  89         }
  90 }
  91
  92 void demo_draw(void)
  93 {
  94         if(opt.music) {
  95                 music_update();
  96         }
  97         scr_update();
  98         scr_draw();
  99
 100         ++nframes;
 101 }
 102
 103 static void change_screen(int idx)
 104 {
 105         printf("change screen %d\n", idx);
 106         scr_change(scr_screen(idx), 4000);
 107 }
 108
 109 #define CBUF_SIZE       64
 110 #define CBUF_MASK       (CBUF_SIZE - 1)
 111 void demo_keyboard(int key, int press)
 112 {
 113         static char cbuf[CBUF_SIZE];
 114         static int rd, wr;
 115         char inp[CBUF_SIZE + 1], *dptr;
 116         int i, nscr;
 117
 118         if(press) {
 119                 switch(key) {
 120                 case 27:
 121                         demo_quit();
 122                         break;
 123
 124                 case '\n':
 125                 case '\r':
 126                         dptr = inp;
 127                         while(rd != wr) {
 128                                 *dptr++ = cbuf[rd];
 129                                 rd = (rd + 1) & CBUF_MASK;
 130                         }
 131                         *dptr = 0;
 132                         if(inp[0]) {
 133                                 printf("trying to match: %s\n", inp);
 134                                 nscr = scr_num_screens();
 135                                 for(i=0; i<nscr; i++) {
 136                                         if(strstr(scr_screen(i)->name, inp)) {
 137                                                 change_screen(i);
 138                                                 break;
 139                                         }
 140                                 }
 141                         }
 142                         break;
 143
 144                 default:
 145                         if(key >= '1' && key <= '9' && key <= '1' + scr_num_screens()) {
 146                                 change_screen(key - '1');
 147                         } else if(key == '0' && scr_num_screens() >= 10) {
 148                                 change_screen(9);
 149                         }
 150
 151                         if(key < 256 && isprint(key)) {
 152                                 cbuf[wr] = key;
 153                                 wr = (wr + 1) & CBUF_MASK;
 154                                 if(wr == rd) { /* overflow */
 155                                         rd = (rd + 1) & CBUF_MASK;
 156                                 }
 157                         }
 158                         break;
 159                 }
 160         }
 161 }
 162
 163
 164 void mouse_orbit_update(float *theta, float *phi, float *dist)
 165 {
 166         static int prev_mx, prev_my;
 167         static unsigned int prev_bmask;
 168
 169         if(mouse_bmask) {
 170                 if((mouse_bmask ^ prev_bmask) == 0) {
 171                         int dx = mouse_x - prev_mx;
 172                         int dy = mouse_y - prev_my;
 173
 174                         if(dx || dy) {
 175                                 if(mouse_bmask & 1) {
 176                                         float p = *phi;
 177                                         *theta += dx * 1.0;
 178                                         p += dy * 1.0;
 179
 180                                         if(p < -90) p = -90;
 181                                         if(p > 90) p = 90;
 182                                         *phi = p;
 183                                 }
 184                                 if(mouse_bmask & 4) {
 185                                         *dist += dy * 0.5;
 186
 187                                         if(*dist < 0) *dist = 0;
 188                                 }
 189                         }
 190                 }
 191         }
 192         prev_mx = mouse_x;
 193         prev_my = mouse_y;
 194         prev_bmask = mouse_bmask;
 195 }