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/*
* keyboard.c
*
* Basic keyboard handing functions -- allows event-handling loops
* to push keyboard events onto a queue so they can be processed at
* the appropriate time in the game rounds loop
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <math.h>
#include "graphics.h"
#include "grv.h"
#define KEYQUEUELEN 16
static SDL_KeyboardEvent keyqueue[KEYQUEUELEN];
static SDL_KeyboardEvent *kqh = keyqueue;
static SDL_KeyboardEvent *kqt = keyqueue;
static int queuedkeys = 0;
/*
* Push a keyboard event onto the queue; use this in event loops
*/
void push_key(SDL_KeyboardEvent *ke)
{
/* Hack to add some nondeterminism into the gameid's */
if ( !gp.have_id ) {
gp.gameid = (gp.gameid << 5 | gp.gameid >> 59)
+ ((uint64_t)SDL_GetTicks() << 32) + genrand_int32();
}
if ( queuedkeys >= KEYQUEUELEN )
return; /* Drop it */
queuedkeys++;
*kqh++ = *ke;
if ( kqh >= &keyqueue[KEYQUEUELEN] )
kqh = keyqueue;
}
/*
* Poll the keyboard queue for a key event
*/
SDL_KeyboardEvent *poll_key(void)
{
SDL_KeyboardEvent *ke;
if ( queuedkeys ) {
queuedkeys--;
ke = kqt++;
if ( kqt >= &keyqueue[KEYQUEUELEN] )
kqt = keyqueue;
return ke;
} else {
return NULL;
}
}
/*
* Get a key, pausing if necessary
*/
SDL_KeyboardEvent *get_key(void)
{
static SDL_Event event;
SDL_KeyboardEvent *ke;
if ( (ke = poll_key()) )
return ke;
while ( SDL_WaitEvent(&event) ) {
if ( event.type == SDL_KEYDOWN )
return &event.key;
else if ( event.type == SDL_USEREVENT && event.user.code == event_blink )
update_blink();
}
return NULL;
}
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