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/* Copyright (c) 2013, Stanislaw Halik <sthalik@misaki.pl>
* Permission to use, copy, modify, and/or distribute this
* software for any purpose with or without fee is hereby granted,
* provided that the above copyright notice and this permission
* notice appear in all copies.
*/
#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <sys/file.h>
#include <sys/mman.h>
#include <limits.h>
#include <unistd.h>
#include <math.h>
#include <XPLMPlugin.h>
#include <XPLMDataAccess.h>
#include <XPLMProcessing.h>
#include <XPLMUtilities.h>
#ifndef PLUGIN_API
#define PLUGIN_API
#endif
#pragma GCC diagnostic ignored "-Wunused-parameter"
/* using Wine name to ease things */
#define WINE_SHM_NAME "facetracknoir-wine-shm"
#define WINE_MTX_NAME "facetracknoir-wine-mtx"
#define BUILD_compat
#include "compat/export.hpp"
enum Axis {
TX = 0, TY, TZ, Yaw, Pitch, Roll
};
typedef struct shm_wrapper
{
void* mem;
int fd, size;
} shm_wrapper;
typedef struct WineSHM
{
double data[6];
int gameid, gameid2;
unsigned char table[8];
bool stop;
} WineSHM;
static shm_wrapper* lck_posix = NULL;
static WineSHM* shm_posix = NULL;
static void *view_x, *view_y, *view_z, *view_heading, *view_pitch, *view_roll;
static float offset_x, offset_y, offset_z;
static XPLMCommandRef track_toggle = NULL, translation_disable_toggle = NULL;
static int track_disabled = 1;
static int translation_disabled;
static void reinit_offset() {
offset_x = XPLMGetDataf(view_x);
offset_y = XPLMGetDataf(view_y);
offset_z = XPLMGetDataf(view_z);
}
shm_wrapper* shm_wrapper_init(const char *shm_name, const char *mutex_name, int mapSize)
{
(void)mutex_name;
shm_wrapper* self = malloc(sizeof(shm_wrapper));
char shm_filename[NAME_MAX];
shm_filename[0] = '/';
strncpy(shm_filename+1, shm_name, NAME_MAX-2);
shm_filename[NAME_MAX-1] = '\0';
/* (void) shm_unlink(shm_filename); */
self->fd = shm_open(shm_filename, O_RDWR | O_CREAT, 0600);
(void) ftruncate(self->fd, mapSize);
self->mem = mmap(NULL, mapSize, PROT_READ|PROT_WRITE, MAP_SHARED, self->fd, (off_t)0);
return self;
}
void shm_wrapper_free(shm_wrapper* self)
{
/*(void) shm_unlink(shm_filename);*/
(void) munmap(self->mem, self->size);
(void) close(self->fd);
free(self);
}
void shm_wrapper_lock(shm_wrapper* self)
{
flock(self->fd, LOCK_SH);
}
void shm_wrapper_unlock(shm_wrapper* self)
{
flock(self->fd, LOCK_UN);
}
float write_head_position(
float inElapsedSinceLastCall,
float inElapsedTimeSinceLastFlightLoop,
int inCounter,
void * inRefcon )
{
if (lck_posix != NULL && shm_posix != NULL) {
shm_wrapper_lock(lck_posix);
if (!translation_disabled)
{
XPLMSetDataf(view_x, shm_posix->data[TX] * 1e-3 + offset_x);
XPLMSetDataf(view_y, shm_posix->data[TY] * 1e-3 + offset_y);
XPLMSetDataf(view_z, shm_posix->data[TZ] * 1e-3 + offset_z);
}
XPLMSetDataf(view_heading, shm_posix->data[Yaw] * 180 / M_PI);
XPLMSetDataf(view_pitch, shm_posix->data[Pitch] * 180 / M_PI);
XPLMSetDataf(view_roll, shm_posix->data[Roll] * 180 / M_PI);
shm_wrapper_unlock(lck_posix);
}
return -1.0;
}
static int TrackToggleHandler( XPLMCommandRef inCommand,
XPLMCommandPhase inPhase,
void * inRefCon )
{
if ( track_disabled )
{
//Enable
XPLMRegisterFlightLoopCallback(write_head_position, -1.0, NULL);
// Reinit the offsets when we re-enable the plugin
if ( !translation_disabled )
reinit_offset();
}
else
{
//Disable
XPLMUnregisterFlightLoopCallback(write_head_position, NULL);
}
track_disabled = !track_disabled;
return 0;
}
static int TranslationToggleHandler( XPLMCommandRef inCommand,
XPLMCommandPhase inPhase,
void * inRefCon )
{
translation_disabled = !translation_disabled;
if (!translation_disabled)
{
// Reinit the offsets when we re-enable the translations so that we can "move around"
reinit_offset();
}
return 0;
}
PLUGIN_API OTR_COMPAT_EXPORT int XPluginStart ( char * outName, char * outSignature, char * outDescription ) {
view_x = XPLMFindDataRef("sim/aircraft/view/acf_peX");
view_y = XPLMFindDataRef("sim/aircraft/view/acf_peY");
view_z = XPLMFindDataRef("sim/aircraft/view/acf_peZ");
view_heading = XPLMFindDataRef("sim/graphics/view/pilots_head_psi");
view_pitch = XPLMFindDataRef("sim/graphics/view/pilots_head_the");
view_roll = XPLMFindDataRef("sim/graphics/view/field_of_view_roll_deg");
track_toggle = XPLMCreateCommand("opentrack/toggle", "Disable/Enable head tracking");
translation_disable_toggle = XPLMCreateCommand("opentrack/toggle_translation", "Disable/Enable input translation from opentrack");
XPLMRegisterCommandHandler( track_toggle,
TrackToggleHandler,
1,
(void*)0);
XPLMRegisterCommandHandler( translation_disable_toggle,
TranslationToggleHandler,
1,
(void*)0);
if (view_x && view_y && view_z && view_heading && view_pitch && track_toggle && translation_disable_toggle) {
lck_posix = shm_wrapper_init(WINE_SHM_NAME, WINE_MTX_NAME, sizeof(WineSHM));
if (lck_posix->mem == (void*)-1) {
fprintf(stderr, "opentrack failed to init SHM!\n");
return 0;
}
shm_posix = (WineSHM*) lck_posix->mem;
memset(shm_posix, 0, sizeof(WineSHM));
strcpy(outName, "opentrack");
strcpy(outSignature, "opentrack - freetrack lives!");
strcpy(outDescription, "head tracking view control");
fprintf(stderr, "opentrack init complete\n");
return 1;
}
return 0;
}
PLUGIN_API OTR_COMPAT_EXPORT void XPluginStop ( void ) {
if (lck_posix)
{
shm_wrapper_free(lck_posix);
lck_posix = NULL;
shm_posix = NULL;
}
}
PLUGIN_API OTR_COMPAT_EXPORT void XPluginEnable ( void ) {
XPLMRegisterFlightLoopCallback(write_head_position, -1.0, NULL);
track_disabled = 0;
}
PLUGIN_API OTR_COMPAT_EXPORT void XPluginDisable ( void ) {
XPLMUnregisterFlightLoopCallback(write_head_position, NULL);
track_disabled = 1;
}
PLUGIN_API OTR_COMPAT_EXPORT void XPluginReceiveMessage(
XPLMPluginID inFromWho,
int inMessage,
void * inParam)
{
if (inMessage == XPLM_MSG_AIRPORT_LOADED)
reinit_offset();
}
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