posix_input.cpp

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/*
===========================================================================

Doom 3 GPL Source Code
Copyright (C) 1999-2011 id Software LLC, a ZeniMax Media company. 

This file is part of the Doom 3 GPL Source Code (?Doom 3 Source Code?).  

Doom 3 Source Code is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Doom 3 Source Code is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Doom 3 Source Code.  If not, see <http://www.gnu.org/licenses/>.

In addition, the Doom 3 Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 Source Code.  If not, please request a copy in writing from id Software at the address below.

If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.

===========================================================================
*/
#include "../../idlib/precompiled.h"
#include "posix_public.h"

typedef struct poll_keyboard_event_s
{
        int key;
        bool state;     
} poll_keyboard_event_t;

typedef struct poll_mouse_event_s
{
        int action;
        int value;
} poll_mouse_event_t;

#define MAX_POLL_EVENTS 50
#define POLL_EVENTS_HEADROOM 2 // some situations require to add several events
static poll_keyboard_event_t poll_events_keyboard[MAX_POLL_EVENTS + POLL_EVENTS_HEADROOM];
static int poll_keyboard_event_count;
static poll_mouse_event_t poll_events_mouse[MAX_POLL_EVENTS + POLL_EVENTS_HEADROOM];
static int poll_mouse_event_count;

/*
==========
Posix_AddKeyboardPollEvent
==========
*/
bool Posix_AddKeyboardPollEvent(int key, bool state) {
        if (poll_keyboard_event_count >= MAX_POLL_EVENTS + POLL_EVENTS_HEADROOM)
                common->FatalError( "poll_keyboard_event_count exceeded MAX_POLL_EVENT + POLL_EVENTS_HEADROOM\n");
        poll_events_keyboard[poll_keyboard_event_count].key = key;
        poll_events_keyboard[poll_keyboard_event_count++].state = state;
        if (poll_keyboard_event_count >= MAX_POLL_EVENTS) {
                common->DPrintf("WARNING: reached MAX_POLL_EVENT poll_keyboard_event_count\n");
                return false;
        }
        return true;
}

/*
==========
Posix_AddMousePollEvent
==========
*/
bool Posix_AddMousePollEvent(int action, int value) {
        if (poll_mouse_event_count >= MAX_POLL_EVENTS + POLL_EVENTS_HEADROOM)
                common->FatalError( "poll_mouse_event_count exceeded MAX_POLL_EVENT + POLL_EVENTS_HEADROOM\n");
        poll_events_mouse[poll_mouse_event_count].action = action;
        poll_events_mouse[poll_mouse_event_count++].value = value;
        if (poll_mouse_event_count >= MAX_POLL_EVENTS) {
                common->DPrintf("WARNING: reached MAX_POLL_EVENT poll_mouse_event_count\n");
                return false;
        }
        return true;
}

/*
===========================================================================
polled from GetDirectUsercmd
async input polling is obsolete
we have a single entry point for both mouse and keyboard
the mouse/keyboard seperation is API legacy
===========================================================================
*/

int Sys_PollKeyboardInputEvents( void ) {
        return poll_keyboard_event_count;
}

int Sys_ReturnKeyboardInputEvent( const int n, int &key, bool &state ) {
        if ( n >= poll_keyboard_event_count ) {
                return 0;
        }
        key = poll_events_keyboard[n].key;
        state = poll_events_keyboard[n].state;
        return 1;
}

void Sys_EndKeyboardInputEvents( void ) {
        //isn't this were it's supposed to be, was missing some key strokes with it set below
        poll_keyboard_event_count = 0;  
 }

int Sys_PollMouseInputEvents( void ) {
#if 0 //moved to the Sys_End functions
        poll_keyboard_event_count = 0;
        poll_mouse_event_count = 0;
#endif

        // that's OS specific, implemented in osx/ and linux/
        Posix_PollInput( );

        return poll_mouse_event_count;
}

int     Sys_ReturnMouseInputEvent( const int n, int &action, int &value )
{
        if ( n>=poll_mouse_event_count ) {
                return 0;
        }
        action = poll_events_mouse[ n ].action;
        value = poll_events_mouse[ n ].value;
        return 1;
}

void Sys_EndMouseInputEvents( void ) {
        // moved out of the Sys_PollMouseInputEvents
        poll_mouse_event_count = 0;
}