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

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include "screen.h"
   5 #include "demo.h"
   6
   7 struct screen *tunnel_screen(void);
   8
   9 #define NUM_SCR 1
  10 static struct screen *scr[NUM_SCR];
  11
  12 static struct screen *cur, *prev, *next;
  13 static long trans_start, trans_dur;
  14
  15 int scr_init(void)
  16 {
  17         int i;
  18
  19         if(!(scr[0] = tunnel_screen())) {
  20                 return -1;
  21         }
  22
  23         for(i=0; i<NUM_SCR; i++) {
  24                 if(scr[i]->init() == -1) {
  25                         return -1;
  26                 }
  27         }
  28         return 0;
  29 }
  30
  31 void scr_shutdown(void)
  32 {
  33         int i;
  34         for(i=0; i<NUM_SCR; i++) {
  35                 scr[i]->shutdown();
  36         }
  37 }
  38
  39 void scr_update(void)
  40 {
  41         if(prev) {      /* we're in the middle of a transition */
  42                 long interval = time_msec - trans_start;
  43                 if(interval >= trans_dur) {
  44                         next->start(trans_dur);
  45                         prev = 0;
  46                         cur = next;
  47                         next = 0;
  48                 }
  49         }
  50 }
  51
  52 void scr_draw(void)
  53 {
  54         if(cur) cur->draw();
  55 }
  56
  57 struct screen *scr_lookup(const char *name)
  58 {
  59         int i;
  60         for(i=0; i<NUM_SCR; i++) {
  61                 if(strcmp(scr[i]->name, name) == 0) {
  62                         return scr[i];
  63                 }
  64         }
  65         return 0;
  66 }
  67
  68 int scr_change(struct screen *s, long trans_time)
  69 {
  70         if(!s) return -1;
  71         if(s == cur) return 0;
  72
  73         if(trans_time) {
  74                 trans_dur = trans_time / 2;     /* half for each part transition out then in */
  75                 trans_start = time_msec;
  76         } else {
  77                 trans_dur = 0;
  78         }
  79
  80         if(cur) {
  81                 cur->stop(trans_dur);
  82
  83                 prev = cur;
  84                 next = s;
  85         } else {
  86                 s->start(trans_dur);
  87
  88                 cur = s;
  89                 prev = 0;
  90         }
  91         return 0;
  92 }