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#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 <XPLMPlugin.h>
#include <XPLMDataAccess.h>
#include <XPLMProcessing.h>
#ifndef PLUGIN_API
#define PLUGIN_API
#endif
/* using Wine name to ease things */
#define WINE_SHM_NAME "facetracknoir-wine-shm"
#define WINE_MTX_NAME "facetracknoir-wine-mtx"
enum Axis {
TX = 0, TY, TZ, Yaw, Pitch, Roll
};
typedef struct PortableLockedShm {
void* mem;
int fd, size;
} PortableLockedShm;
typedef struct WineSHM {
double data[6];
int gameid, gameid2;
unsigned char table[8];
bool stop;
} WineSHM;
static PortableLockedShm* lck_posix = NULL;
static WineSHM* shm_posix = NULL;
static void *view_x, *view_y, *view_z, *view_heading, *view_pitch;
static float offset_x, offset_y, offset_z;
static void reinit_offset() {
offset_x = XPLMGetDataf(view_x);
offset_y = XPLMGetDataf(view_y);
offset_z = XPLMGetDataf(view_z);
}
#ifdef __GNUC__
# define OT_UNUSED(varname) varname __attribute__((__unused__))
#else
# define OT_UNUSED(varname) varname
#endif
PortableLockedShm* PortableLockedShm_init(const char *shmName, const char *OT_UNUSED(mutexName), int mapSize)
{
PortableLockedShm* self = malloc(sizeof(PortableLockedShm));
char shm_filename[NAME_MAX];
shm_filename[0] = '/';
strncpy(shm_filename+1, shmName, 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 PortableLockedShm_free(PortableLockedShm* self)
{
/*(void) shm_unlink(shm_filename);*/
(void) munmap(self->mem, self->size);
(void) close(self->fd);
free(self);
}
void PortableLockedShm_lock(PortableLockedShm* self)
{
flock(self->fd, LOCK_SH);
}
void PortableLockedShm_unlock(PortableLockedShm* self)
{
flock(self->fd, LOCK_UN);
}
float write_head_position(
float OT_UNUSED(inElapsedSinceLastCall),
float OT_UNUSED(inElapsedTimeSinceLastFlightLoop),
int OT_UNUSED(inCounter),
void * OT_UNUSED(inRefcon) )
{
if (lck_posix != NULL && shm_posix != NULL) {
PortableLockedShm_lock(lck_posix);
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 / 3.141592654);
XPLMSetDataf(view_pitch, shm_posix->data[Pitch] * 180 / 3.141592654);
PortableLockedShm_unlock(lck_posix);
}
return -1.0;
}
PLUGIN_API 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");
if (view_x && view_y && view_z && view_heading && view_pitch) {
lck_posix = PortableLockedShm_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 void XPluginStop ( void ) {
if (lck_posix)
{
PortableLockedShm_free(lck_posix);
lck_posix = NULL;
shm_posix = NULL;
}
}
PLUGIN_API void XPluginEnable ( void ) {
XPLMRegisterFlightLoopCallback(write_head_position, -1.0, NULL);
}
PLUGIN_API void XPluginDisable ( void ) {
XPLMUnregisterFlightLoopCallback(write_head_position, NULL);
}
PLUGIN_API void XPluginReceiveMessage(
XPLMPluginID OT_UNUSED(inFromWho),
int OT_UNUSED(inMessage),
void * OT_UNUSED(inParam))
{
if (inMessage == XPLM_MSG_AIRPORT_LOADED)
reinit_offset();
}
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