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