1 files changed, 97 insertions, 0 deletions
diff --git a/protocol-libevdev/ftnoir_protocol_libevdev.cpp b/protocol-libevdev/ftnoir_protocol_libevdev.cpp
new file mode 100644
index 00000000..96805b39
--- /dev/null
+++ b/protocol-libevdev/ftnoir_protocol_libevdev.cpp
@@ -0,0 +1,97 @@
+#include "ftnoir_protocol_libevdev.h"
+#include "opentrack/plugin-api.hpp"
+#include <cstdio>
+#include <algorithm>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#define CHECK_LIBEVDEV(expr) if ((error = (expr)) != 0) goto error;
+
+static const int max_input = 65535;
+static const int mid_input = 32767;
+static const int min_input = 0;
+
+FTNoIR_Protocol::FTNoIR_Protocol() : dev(NULL), uidev(NULL)
+{
+    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 = min_input;
+    absinfo.maximum = max_input;
+    absinfo.resolution = 1;
+    absinfo.value = mid_input;
+    absinfo.flat = 1;
+    absinfo.fuzz = 0;
+
+    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));
+
+    /* do not remove next 3 lines or udev scripts won't assign 0664 permissions -sh */
+    CHECK_LIBEVDEV(libevdev_enable_event_type(dev, EV_KEY));
+    CHECK_LIBEVDEV(libevdev_enable_event_code(dev, EV_KEY, BTN_JOYSTICK, NULL));
+    CHECK_LIBEVDEV(libevdev_enable_event_code(dev, EV_KEY, BTN_TRIGGER, NULL));
+
+    CHECK_LIBEVDEV(libevdev_uinput_create_from_device(dev, LIBEVDEV_UINPUT_OPEN_MANAGED, &uidev));
+
+    return;
+error:
+    if (uidev)
+        libevdev_uinput_destroy(uidev);
+    if (dev)
+        libevdev_free(dev);
+    if (error)
+        fprintf(stderr, "libevdev error: %d\n", error);
+    uidev = NULL;
+    dev = NULL;
+}
+
+FTNoIR_Protocol::~FTNoIR_Protocol()
+{
+    if (uidev)
+        libevdev_uinput_destroy(uidev);
+    if (dev)
+        libevdev_free(dev);
+}
+
+void FTNoIR_Protocol::pose(const double* headpose) {
+    static const int axes[] = {
+        /* translation goes first */
+        ABS_X, ABS_Y, ABS_Z, ABS_RX, ABS_RY, ABS_RZ
+    };
+
+    static const int max_value[] = {
+        100,
+        100,
+        100,
+        180,
+        90,
+        180
+    };
+
+    for (int i = 0; i < 6; i++)
+    {
+        int value = headpose[i] * mid_input / max_value[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);
+    }
+
+    (void) libevdev_uinput_write_event(uidev, EV_SYN, SYN_REPORT, 0);
+}
+
+OPENTRACK_DECLARE_PROTOCOL(FTNoIR_Protocol, LibevdevControls, FTNoIR_ProtocolDll)