joystick_internal.c

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////////////////////////////////////////////////////////////////////////////////
//     
//    __                                ______
//   / /_______________  ____  ___     / ____/
//  / __/ ___/ ___/ __ \/ __ \/ _ \   /___ )  
// / /_(__  ) /__/ /_/ / /_/ /  __/  ____/ /  
// \__/____/\___/\____/ .___/\___/  /_____/   
//                   /_/                      
//     
/// \file joystick_internal.c
/// Definitions of internal joystick functions.
////////////////////////////////////////////////////////////////////////////////

#include "../include/tscope5/joystick_internal.h"
#include "../include/tscope5/system_internal.h"
#include "../include/tscope5/timer_internal.h"

/// Is the joystick subsystem installed?
int _ts5_is_joystick_installed = 0;

////////////////////////////////////////////////////////////////////////////////
/// Do some checks at the start of each joystick function.
///
/// \param calling_function Name the function that calls for 
/// this check or installation.
///
/// Checks whether the joystick subsystem is installed. 
/// If not, the joystick subsystem is installed.
////////////////////////////////////////////////////////////////////////////////
void ts5_check_joystick(char *calling_function)
{
    ts5_log(TS5_LOGLEVEL_6, "%s: ts5_check_joystick\n", calling_function);
    if (!_ts5_is_joystick_installed) {
        ts5_install_joystick(calling_function);
    }
}


////////////////////////////////////////////////////////////////////////////////
/// Install the joystick subsystem.
///
/// \param calling_function Name the function that calls for 
/// this check or installation.
///
/// This function is called automatically if necessary.
////////////////////////////////////////////////////////////////////////////////
void ts5_install_joystick(char *calling_function)
{
    if (!_ts5_is_timer_installed) {
        ts5_install_timer(calling_function);
    }

    if (!_ts5_is_joystick_installed) {

        _ts5_is_joystick_installed = 1;
        ts5_log(TS5_LOGLEVEL_1, "%s: Installing Tscope5 joystick\n", 
                calling_function);

        if (!al_install_joystick()) {
            ts5_fatal("%s: could not install Tscope5 joystick\n", 
                    calling_function);
        }

        al_register_event_source(_ts5_data.timer.response_queue,
                                    al_get_joystick_event_source());

        _ts5_status.timer.num_joysticks = al_get_num_joysticks();
        _ts5_status.timer.joystick =
            (TS5_JOYSTICK_STATUS *)al_malloc(sizeof(TS5_JOYSTICK_STATUS)*
            _ts5_status.timer.num_joysticks);

        int i;
        for (i=0; i<_ts5_status.timer.num_joysticks; i++) {

            ALLEGRO_JOYSTICK *joy = al_get_joystick(i);

            _ts5_status.timer.joystick[i].num_buttons = 
                al_get_joystick_num_buttons(joy);
            
            _ts5_status.timer.joystick[i].num_defined_buttons = 0;
            _ts5_status.timer.joystick[i].num_active_buttons = 0;

            _ts5_status.timer.joystick[i].button_press_defined =
                (int *)al_malloc(sizeof(int)
                * _ts5_status.timer.joystick[i].num_buttons);

            _ts5_status.timer.joystick[i].button_press_active =
                (int *)al_malloc(sizeof(int)
                * _ts5_status.timer.joystick[i].num_buttons);

            _ts5_status.timer.joystick[i].button_release_defined =
                (int *)al_malloc(sizeof(int)
                * _ts5_status.timer.joystick[i].num_buttons);

            _ts5_status.timer.joystick[i].button_release_active =
                (int *)al_malloc(sizeof(int)
                * _ts5_status.timer.joystick[i].num_buttons);

            int j;
            for (j=0; j<_ts5_status.timer.joystick[i].num_buttons; j++) {
                _ts5_status.timer.joystick[i].button_press_defined[j] = 0;
                _ts5_status.timer.joystick[i].button_press_active[j] = 0;
                _ts5_status.timer.joystick[i].button_release_defined[j] = 0;
                _ts5_status.timer.joystick[i].button_release_active[j] = 0;
            }
        }

        atexit(ts5_uninstall_joystick);
    }
}


////////////////////////////////////////////////////////////////////////////////
/// Uninstall the joystick subsystem.
///
/// This function is called automatically at the end of the program.
////////////////////////////////////////////////////////////////////////////////
void ts5_uninstall_joystick()
{
    if (_ts5_is_joystick_installed) {

        ts5_log(TS5_LOGLEVEL_1, "Uninstalling Tscope5 joystick\n");

        int i;
        for (i=0; i<_ts5_status.timer.num_joysticks; i++) {

            al_free(_ts5_status.timer.joystick[i].button_press_defined);
            _ts5_status.timer.joystick[i].button_press_defined = NULL;

            al_free(_ts5_status.timer.joystick[i].button_press_active);
            _ts5_status.timer.joystick[i].button_press_active = NULL;

            al_free(_ts5_status.timer.joystick[i].button_release_defined);
            _ts5_status.timer.joystick[i].button_release_defined = NULL;

            al_free(_ts5_status.timer.joystick[i].button_release_active);
            _ts5_status.timer.joystick[i].button_release_active = NULL;
        }

        al_free(_ts5_status.timer.joystick);
        _ts5_status.timer.joystick=NULL;

        _ts5_status.timer.num_joysticks = 0;
        _ts5_status.timer.joystick_is_response_device = 0;

        al_unregister_event_source(_ts5_data.timer.response_queue,
                                    al_get_joystick_event_source());

        #ifdef TS5_MACOSX
            al_uninstall_joystick();

        #endif

        _ts5_is_joystick_installed = 0;
    }
}