GHOST_NDOFManagerX11.cpp

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/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program 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 2
 * of the License, or (at your option) any later version. 
 *
 * This program 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 this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * Contributor(s):
 *   Mike Erwin
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#ifdef WITH_INPUT_NDOF

#include "GHOST_NDOFManagerX11.h"
#include "GHOST_SystemX11.h"
#include <spnav.h>
#include <stdio.h>


GHOST_NDOFManagerX11::GHOST_NDOFManagerX11(GHOST_System& sys)
    :
      GHOST_NDOFManager(sys),
      m_available(false)
{
    setDeadZone(0.1f); /* how to calibrate on Linux? throw away slight motion! */

    if (spnav_open() != -1) {
        /* determine exactly which device (if any) is plugged in */

#define MAX_LINE_LENGTH 100

        /* look for USB devices with Logitech's vendor ID */
        FILE* command_output = popen("lsusb -d 046d:","r");
        if (command_output) {
            char line[MAX_LINE_LENGTH] = {0};
            while (fgets(line, MAX_LINE_LENGTH, command_output)) {
                unsigned short vendor_id = 0, product_id = 0;
                if (sscanf(line, "Bus %*d Device %*d: ID %hx:%hx", &vendor_id, &product_id) == 2)
                    if (setDevice(vendor_id, product_id)) {
                        m_available = true;
                        break; /* stop looking once the first 3D mouse is found */
                    }
            }
            pclose(command_output);
        }
    }
    else {
        puts("ndof: spacenavd not found");
        /* This isn't a hard error, just means the user doesn't have a 3D mouse. */
    }
}

GHOST_NDOFManagerX11::~GHOST_NDOFManagerX11()
{
    if (m_available)
        spnav_close();
}

bool GHOST_NDOFManagerX11::available()
{
    return m_available;
}

bool GHOST_NDOFManagerX11::processEvents()
{
    GHOST_TUns64 now = m_system.getMilliSeconds();

    bool anyProcessed = false;
    spnav_event e;
    while (spnav_poll_event(&e)) {
        switch (e.type) {
            case SPNAV_EVENT_MOTION:
            {
                /* convert to blender view coords */
                short t[3] = {e.motion.x, e.motion.y, -e.motion.z};
                short r[3] = {-e.motion.rx, -e.motion.ry, e.motion.rz};

                updateTranslation(t, now);
                updateRotation(r, now);
                break;
            }
            case SPNAV_EVENT_BUTTON:
                updateButton(e.button.bnum, e.button.press, now);
                break;
        }
        anyProcessed = true;
    }
    return anyProcessed;
}

#endif /* WITH_INPUT_NDOF */