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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "GHOST_NDOFManagerUnix.h"
#include "GHOST_System.h"
#include <spnav.h>
#include <stdio.h>
#include <unistd.h>
#define SPNAV_SOCK_PATH "/var/run/spnav.sock"
GHOST_NDOFManagerUnix::GHOST_NDOFManagerUnix(GHOST_System &sys)
: GHOST_NDOFManager(sys), m_available(false)
{
if (access(SPNAV_SOCK_PATH, F_OK) != 0) {
#ifdef DEBUG
/* annoying for official builds, just adds noise and most people don't own these */
puts("ndof: spacenavd not found");
/* This isn't a hard error, just means the user doesn't have a 3D mouse. */
#endif
}
else if (spnav_open() != -1) {
m_available = true;
/* determine exactly which device (if any) is plugged in */
#define MAX_LINE_LENGTH 100
/* look for USB devices with Logitech or 3Dconnexion's vendor ID */
FILE *command_output = popen("lsusb | grep '046d:\\|256f:'", "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)) {
break; /* stop looking once the first 3D mouse is found */
}
}
}
pclose(command_output);
}
}
}
GHOST_NDOFManagerUnix::~GHOST_NDOFManagerUnix()
{
if (m_available) {
spnav_close();
}
}
bool GHOST_NDOFManagerUnix::available()
{
return m_available;
}
/*
* Workaround for a problem where we don't enter the 'GHOST_kFinished' state,
* this causes any proceeding event to have a very high 'dt' (time delta),
* many seconds for eg, causing the view to jump.
*
* this workaround expects continuous events, if we miss a motion event,
* immediately send a dummy event with no motion to ensure the finished state is reached.
*/
#define USE_FINISH_GLITCH_WORKAROUND
/* TODO: make this available on all platforms */
#ifdef USE_FINISH_GLITCH_WORKAROUND
static bool motion_test_prev = false;
#endif
bool GHOST_NDOFManagerUnix::processEvents()
{
bool anyProcessed = false;
if (m_available) {
spnav_event e;
#ifdef USE_FINISH_GLITCH_WORKAROUND
bool motion_test = false;
#endif
while (spnav_poll_event(&e)) {
switch (e.type) {
case SPNAV_EVENT_MOTION: {
/* convert to blender view coords */
uint64_t now = m_system.getMilliSeconds();
const int t[3] = {(int)e.motion.x, (int)e.motion.y, (int)-e.motion.z};
const int r[3] = {(int)-e.motion.rx, (int)-e.motion.ry, (int)e.motion.rz};
updateTranslation(t, now);
updateRotation(r, now);
#ifdef USE_FINISH_GLITCH_WORKAROUND
motion_test = true;
#endif
break;
}
case SPNAV_EVENT_BUTTON:
uint64_t now = m_system.getMilliSeconds();
updateButton(e.button.bnum, e.button.press, now);
break;
}
anyProcessed = true;
}
#ifdef USE_FINISH_GLITCH_WORKAROUND
if (motion_test_prev == true && motion_test == false) {
uint64_t now = m_system.getMilliSeconds();
const int v[3] = {0, 0, 0};
updateTranslation(v, now);
updateRotation(v, now);
anyProcessed = true;
}
motion_test_prev = motion_test;
#endif
}
return anyProcessed;
}
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