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/* Copyright (C) 2001 by Alex Kompel <shurikk@pacbell.net> */
/* NetHack may be freely redistributed. See license for details. */
#include <assert.h>
#include "winMS.h"
#include "mhinput.h"
/* nethack input queue functions */
#define NH_INPUT_BUFFER_SIZE 64
/* as it stands right now we need only one slot
since events are processed almost the same time as
they occur but I like large round numbers */
static MSNHEvent nhi_input_buffer[NH_INPUT_BUFFER_SIZE];
static int nhi_init_input = 0;
static int nhi_read_pos = 0;
static int nhi_write_pos = 0;
/* initialize input queue */
void mswin_nh_input_init(void)
{
if( !nhi_init_input ) {
nhi_init_input = 1;
ZeroMemory( nhi_input_buffer, sizeof(nhi_input_buffer) );
nhi_read_pos = 0;
nhi_write_pos = 0;
}
}
/* check for input */
int mswin_have_input()
{
return (nhi_read_pos!=nhi_write_pos);
}
/* add event to the queue */
void mswin_input_push(PMSNHEvent event)
{
int new_write_pos;
if( !nhi_init_input ) mswin_nh_input_init();
new_write_pos = (nhi_write_pos+1) % NH_INPUT_BUFFER_SIZE;
if(new_write_pos!=nhi_read_pos) {
memcpy(nhi_input_buffer+nhi_write_pos, event, sizeof(*event));
nhi_write_pos = new_write_pos;
}
}
/* get event from the queue and delete it */
PMSNHEvent mswin_input_pop()
{
PMSNHEvent retval;
if( !nhi_init_input ) mswin_nh_input_init();
if( nhi_read_pos!=nhi_write_pos ) {
retval = &nhi_input_buffer[nhi_read_pos];
nhi_read_pos = (nhi_read_pos+1) % NH_INPUT_BUFFER_SIZE;
} else {
retval = NULL;
}
return retval;
}
/* get event from the queue but leave it there */
PMSNHEvent mswin_input_peek()
{
PMSNHEvent retval;
if( !nhi_init_input ) mswin_nh_input_init();
if( nhi_read_pos!=nhi_write_pos ) {
retval = &nhi_input_buffer[nhi_read_pos];
} else {
retval = NULL;
}
return retval;
}
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