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