proto-libevdev: first version. NEEDS UDEV RULE

2 files changed, 43 insertions, 20 deletions

diff --git a/ftnoir_protocol_libevdev/ftnoir_protocol_libevdev.cpp b/ftnoir_protocol_libevdev/ftnoir_protocol_libevdev.cpp
index 6f34d20b..74986299 100644
--- a/ftnoir_protocol_libevdev/ftnoir_protocol_libevdev.cpp
+++ b/ftnoir_protocol_libevdev/ftnoir_protocol_libevdev.cpp
@@ -1,37 +1,52 @@
 #include "ftnoir_protocol_libevdev.h"
 #include "facetracknoir/global-settings.h"
 //#include "ftnoir_tracker_base/ftnoir_tracker_types.h"
+#include <cstdio>
+#include <algorithm>
 
-#define CHECK_LIBEVDEV(expr) if ((expr) != 0) goto error;
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#define CHECK_LIBEVDEV(expr) if (error = (expr) != 0) goto error;
+
+static const int max_input = 8192;
+static const int mid_input = 4096;
+static const int min_input = 0;
+
+#define HT_PI 3.1415926535
 
 FTNoIR_Protocol::FTNoIR_Protocol() : dev(NULL), uidev(NULL)
 {
-    int error;
+    int error = 0;
 
     dev = libevdev_new();
 
     if (!dev)
         goto error;
 
+    CHECK_LIBEVDEV(libevdev_enable_property(dev, INPUT_PROP_BUTTONPAD));
+
     libevdev_set_name(dev, "opentrack headpose");
 
     struct input_absinfo absinfo;
 
-    absinfo.minimum = -ABS_MAX;
-    absinfo.maximum = ABS_MAX;
-    absinfo.resolution= 1; /* units per radian? let's go shopping */
-    absinfo.value = 0;
-    absinfo.fuzz = 1; /* no filtering in evdev subsystem, we do our own */
+    absinfo.minimum = min_input;
+    absinfo.maximum = max_input;
+    absinfo.resolution = 1;
+    absinfo.value = mid_input;
+    absinfo.flat = 8192 / 180;
+    absinfo.fuzz = 1;
+
+    CHECK_LIBEVDEV(libevdev_enable_event_type(dev, EV_ABS));
+    CHECK_LIBEVDEV(libevdev_enable_event_code(dev, EV_ABS, ABS_X, &absinfo));
+    CHECK_LIBEVDEV(libevdev_enable_event_code(dev, EV_ABS, ABS_Y, &absinfo));
+    CHECK_LIBEVDEV(libevdev_enable_event_code(dev, EV_ABS, ABS_Z, &absinfo));
+    CHECK_LIBEVDEV(libevdev_enable_event_code(dev, EV_ABS, ABS_RX, &absinfo));
+    CHECK_LIBEVDEV(libevdev_enable_event_code(dev, EV_ABS, ABS_RY, &absinfo));
 
-    CHECK_LIBEVDEV(libevdev_enable_event_type(dev, EV_ABS))
-    CHECK_LIBEVDEV(libevdev_enable_event_code(dev, EV_ABS, ABS_X, &absinfo))
-    CHECK_LIBEVDEV(libevdev_enable_event_code(dev, EV_ABS, ABS_Y, &absinfo))
-    CHECK_LIBEVDEV(libevdev_enable_event_code(dev, EV_ABS, ABS_Z, &absinfo))
-    CHECK_LIBEVDEV(libevdev_enable_event_code(dev, EV_ABS, ABS_RX, &absinfo))
-    CHECK_LIBEVDEV(libevdev_enable_event_code(dev, EV_ABS, ABS_RY, &absinfo))
-    CHECK_LIBEVDEV(libevdev_enable_event_code(dev, EV_ABS, ABS_RZ, &absinfo))
+    CHECK_LIBEVDEV(libevdev_enable_event_code(dev, EV_ABS, ABS_RZ, &absinfo));
 
-    CHECK_LIBEVDEV(error = libevdev_uinput_create_from_device(dev, LIBEVDEV_UINPUT_OPEN_MANAGED, &uidev))
+    CHECK_LIBEVDEV(libevdev_uinput_create_from_device(dev, LIBEVDEV_UINPUT_OPEN_MANAGED, &uidev));
 
     return;
 error:
@@ -39,6 +54,8 @@ error:
         libevdev_uinput_destroy(uidev);
     if (dev)
         libevdev_free(dev);
+    if (error)
+        fprintf(stderr, "libevdev error: %d\n", error);
     uidev = NULL;
     dev = NULL;
 }
@@ -60,15 +77,19 @@ void FTNoIR_Protocol::sendHeadposeToGame( double *headpose, double *rawheadpose
         2,
         2,
         2,
-        2, /* | pitch | only goes to 90 */
-        1,
+        2,
+        1, /* |pitch| only goes to 90 */
         2
     };
 
     const int max_euler = 90;
 
     for (int i = 0; i < 6; i++)
-        (void) libevdev_uinput_write_event(uidev, EV_ABS, axes[i], ranges[i] * headpose[i] * max_euler / ABS_MAX);
+    {
+        int value = headpose[i] * mid_input / (max_euler * ranges[i]) + mid_input;
+        int normalized = std::max(std::min(max_input, value), min_input);
+        (void) libevdev_uinput_write_event(uidev, EV_ABS, axes[i], normalized);
+    }
 }
 
 extern "C" FTNOIR_PROTOCOL_BASE_EXPORT IProtocol* CALLING_CONVENTION GetConstructor()
diff --git a/ftnoir_protocol_libevdev/ftnoir_protocol_libevdev.h b/ftnoir_protocol_libevdev/ftnoir_protocol_libevdev.h
index b71738f1..42864a07 100644
--- a/ftnoir_protocol_libevdev/ftnoir_protocol_libevdev.h
+++ b/ftnoir_protocol_libevdev/ftnoir_protocol_libevdev.h
@@ -12,8 +12,10 @@
 #include <QSettings>
 #include "facetracknoir/global-settings.h"
 
-#include <libevdev-1.0/libevdev/libevdev.h>
-#include <libevdev-1.0/libevdev/libevdev-uinput.h>
+extern "C" {
+#   include <libevdev-1.0/libevdev/libevdev.h>
+#   include <libevdev-1.0/libevdev/libevdev-uinput.h>
+}
 
 class FTNoIR_Protocol : public IProtocol
 {