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

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <assert.h>
   5 #include "screen.h"
   6 #include "demo.h"
   7
   8 struct screen *tunnel_screen(void);
   9 struct screen *fract_screen(void);
  10 struct screen *grise_screen(void);
  11 struct screen *polytest_screen(void);
  12 struct screen *plasma_screen(void);
  13 struct screen *bump_screen(void);
  14 struct screen *thunder_screen(void);
  15 struct screen *metaballs_screen(void);
  16 struct screen *greets_screen(void);
  17 struct screen *infcubes_screen(void);
  18 struct screen *hairball_screen(void);
  19
  20 #define NUM_SCR 32
  21 static struct screen *scr[NUM_SCR];
  22 static int num_screens;
  23
  24 static struct screen *cur, *prev, *next;
  25 static long trans_start, trans_dur;
  26
  27 int scr_init(void)
  28 {
  29         int i, idx = 0;
  30
  31         if(!(scr[idx++] = tunnel_screen())) {
  32                 return -1;
  33         }
  34         if(!(scr[idx++] = fract_screen())) {
  35                 return -1;
  36         }
  37         if (!(scr[idx++] = grise_screen())) {
  38                 return -1;
  39         }
  40         if(!(scr[idx++] = polytest_screen())) {
  41                 return -1;
  42         }
  43         if (!(scr[idx++] = plasma_screen())) {
  44                 return -1;
  45         }
  46         if (!(scr[idx++] = bump_screen())) {
  47                 return -1;
  48         }
  49         if (!(scr[idx++] = thunder_screen())) {
  50                 return -1;
  51         }
  52         if(!(scr[idx++] = metaballs_screen())) {
  53                 return -1;
  54         }
  55         if(!(scr[idx++] = greets_screen())) {
  56                 return -1;
  57         }
  58         if(!(scr[idx++] = infcubes_screen())) {
  59                 return -1;
  60         }
  61         if(!(scr[idx++] = hairball_screen())) {
  62                 return -1;
  63         }
  64         num_screens = idx;
  65
  66         assert(num_screens <= NUM_SCR);
  67
  68         for(i=0; i<num_screens; i++) {
  69                 if(scr[i]->init() == -1) {
  70                         return -1;
  71                 }
  72         }
  73         return 0;
  74 }
  75
  76 void scr_shutdown(void)
  77 {
  78         int i;
  79         for(i=0; i<num_screens; i++) {
  80                 scr[i]->shutdown();
  81         }
  82 }
  83
  84 void scr_update(void)
  85 {
  86         if(prev) {  /* we're in the middle of a transition */
  87                 long interval = time_msec - trans_start;
  88                 if(interval >= trans_dur) {
  89                         if(next->start) {
  90                                 next->start(trans_dur);
  91                         }
  92                         prev = 0;
  93                         cur = next;
  94                         next = 0;
  95                 }
  96         }
  97 }
  98
  99 void scr_draw(void)
 100 {
 101         if(cur) cur->draw();
 102 }
 103
 104 void scr_keypress(int key)
 105 {
 106         if(cur && cur->keypress) {
 107                 cur->keypress(key);
 108         }
 109 }
 110
 111 struct screen *scr_lookup(const char *name)
 112 {
 113         int i;
 114         for(i=0; i<num_screens; i++) {
 115                 if(strcmp(scr[i]->name, name) == 0) {
 116                         return scr[i];
 117                 }
 118         }
 119         return 0;
 120 }
 121
 122 struct screen *scr_screen(int idx)
 123 {
 124         return scr[idx];
 125 }
 126
 127 int scr_num_screens(void)
 128 {
 129         return num_screens;
 130 }
 131
 132 int scr_change(struct screen *s, long trans_time)
 133 {
 134         if(!s) return -1;
 135         if(s == cur) return 0;
 136
 137         if(trans_time) {
 138                 trans_dur = trans_time / 2; /* half for each part transition out then in */
 139                 trans_start = time_msec;
 140         } else {
 141                 trans_dur = 0;
 142         }
 143
 144         if(cur && cur->stop) {
 145                 cur->stop(trans_dur);
 146                 prev = cur;
 147                 next = s;
 148         } else {
 149                 if(s->start) {
 150                         s->start(trans_dur);
 151                 }
 152
 153                 cur = s;
 154                 prev = 0;
 155         }
 156         return 0;
 157 }