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Refresh once every thirtieth of a second

Browse Source 
And also refresh on keypress
This commit is contained in:
Peter Evans 2018-01-23 23:14:26 -06:00
parent 882cf2c166
commit cfee8baf25
1 changed files with 22 additions and 4 deletions
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26
src/vm_screen.c
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@ -9,10 +9,13 @@
#include <ctype.h>
#include <stdbool.h>
#include <stdlib.h>
#include <sys/time.h>
#include "log.h"
#include "vm_screen.h"
static struct timeval _time;
/*
* Initialize the video of the vm_screen abstraction. This ends up being
* something that depends on our third-party graphics library; in other
@ -28,6 +31,8 @@ vm_screen_init()
return ERR_GFXINIT;
}
gettimeofday(&_time, NULL);
return OK;
}
@ -165,9 +170,10 @@ vm_screen_free(vm_screen *screen)
* determine if there's still a need to continue their run loops.
*/
bool
vm_screen_active(vm_screen *screen)
vm_screen_active(vm_screen *scr)
{
SDL_Event event;
struct timeval curtime;
char ch;
// There may be _many_ events in the queue; for example, you may be
@ -194,13 +200,14 @@ vm_screen_active(vm_screen *screen)
switch (event.type) {
case SDL_KEYDOWN:
screen->key_pressed = true;
screen->last_key = ch;
scr->dirty = true;
scr->key_pressed = true;
scr->last_key = ch;
break;
case SDL_KEYUP:
// Note we do not erase the last_key value.
screen->key_pressed = false;
scr->key_pressed = false;
if (ch == SDLK_ESCAPE) {
return false;
@ -210,6 +217,17 @@ vm_screen_active(vm_screen *screen)
}
}
gettimeofday(&curtime, NULL);
// If it's been more than 1/30th of a second since our last update,
// mark the screen dirty
if (curtime.tv_sec > _time.tv_sec ||
curtime.tv_usec > _time.tv_usec + 33333
) {
memcpy(&_time, &curtime, sizeof(struct timeval));
scr->dirty = true;
}
return true;
}