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
  14 #define NUM_SCR 32
  15 static struct screen *scr[NUM_SCR];
  16 static int num_screens;
  17
  18 static struct screen *cur, *prev, *next;
  19 static long trans_start, trans_dur;
  20
  21 int scr_init(void)
  22 {
  23         int i, idx = 0;
  24
  25         if(!(scr[idx++] = tunnel_screen())) {
  26                 return -1;
  27         }
  28         if(!(scr[idx++] = fract_screen())) {
  29                 return -1;
  30         }
  31         if (!(scr[idx++] = grise_screen())) {
  32                 return -1;
  33         }
  34         if(!(scr[idx++] = polytest_screen())) {
  35                 return -1;
  36         }
  37         if (!(scr[idx++] = plasma_screen())) {
  38                 return -1;
  39         }
  40         num_screens = idx;
  41
  42         assert(num_screens <= NUM_SCR);
  43
  44         for(i=0; i<num_screens; i++) {
  45                 if(scr[i]->init() == -1) {
  46                         return -1;
  47                 }
  48         }
  49         return 0;
  50 }
  51
  52 void scr_shutdown(void)
  53 {
  54         int i;
  55         for(i=0; i<num_screens; i++) {
  56                 scr[i]->shutdown();
  57         }
  58 }
  59
  60 void scr_update(void)
  61 {
  62         if(prev) {  /* we're in the middle of a transition */
  63                 long interval = time_msec - trans_start;
  64                 if(interval >= trans_dur) {
  65                         if(next->start) {
  66                                 next->start(trans_dur);
  67                         }
  68                         prev = 0;
  69                         cur = next;
  70                         next = 0;
  71                 }
  72         }
  73 }
  74
  75 void scr_draw(void)
  76 {
  77         if(cur) cur->draw();
  78 }
  79
  80 struct screen *scr_lookup(const char *name)
  81 {
  82         int i;
  83         for(i=0; i<num_screens; i++) {
  84                 if(strcmp(scr[i]->name, name) == 0) {
  85                         return scr[i];
  86                 }
  87         }
  88         return 0;
  89 }
  90
  91 struct screen *scr_screen(int idx)
  92 {
  93         return scr[idx];
  94 }
  95
  96 int scr_num_screens(void)
  97 {
  98         return num_screens;
  99 }
 100
 101 int scr_change(struct screen *s, long trans_time)
 102 {
 103         if(!s) return -1;
 104         if(s == cur) return 0;
 105
 106         if(trans_time) {
 107                 trans_dur = trans_time / 2; /* half for each part transition out then in */
 108                 trans_start = time_msec;
 109         } else {
 110                 trans_dur = 0;
 111         }
 112
 113         if(cur && cur->stop) {
 114                 cur->stop(trans_dur);
 115                 prev = cur;
 116                 next = s;
 117         } else {
 118                 if(s->start) {
 119                         s->start(trans_dur);
 120                 }
 121
 122                 cur = s;
 123                 prev = 0;
 124         }
 125         return 0;
 126 }