5 files changed, 277 insertions, 0 deletions
diff --git a/opentrack-api/context.cpp b/opentrack-api/context.cpp
new file mode 100644
index 00000000..04fa5ac2
--- /dev/null
+++ b/opentrack-api/context.cpp
@@ -0,0 +1,112 @@
+#include "opentrack-guts.h"
+#include "opentrack.h"
+
+#if defined(__APPLE__)
+#   define SONAME "dylib"
+#elif defined(_WIN32)
+#   define SONAME "dll"
+#else
+#   define SONAME "so"
+#endif
+
+#include <iostream>
+
+#ifdef _MSC_VER
+#   define LIB_PREFIX ""
+#else
+#   define LIB_PREFIX "lib"
+#endif
+
+static Metadata* get_metadata(DynamicLibrary* lib, QString& longName, QIcon& icon)
+{
+    Metadata* meta;
+    if (!lib->Metadata || ((meta = lib->Metadata()), !meta))
+        return NULL;
+    meta->getFullName(&longName);
+    meta->getIcon(&icon);
+    return meta;
+}
+
+static QList<opentrack_meta> list_files(QString filter)
+{
+    QList<opentrack_meta> ret;
+    QStringList filenames = QDir((qApp->applicationDirPath())).entryList(
+                QStringList() << (LIB_PREFIX + filter + ("*." SONAME)),
+                QDir::Files, QDir::Name );
+    for ( int i = 0; i < filenames.size(); i++) {
+        QIcon icon;
+        QString long_name;
+        QString str = filenames.at(i);
+        DynamicLibrary* lib = new DynamicLibrary(str);
+        qDebug() << "Loading" << str;
+        std::cout.flush();
+        Metadata* meta;
+        if (!(meta = get_metadata(lib, long_name, icon)))
+        {
+            delete lib;
+            continue;
+        }
+        /* TODO perhaps return full name and somesuch */
+        delete meta;
+        QString prefix(LIB_PREFIX + filter);
+        QString suffix("." SONAME);
+        if (str.size() > prefix.size() + suffix.size() && str.startsWith(prefix) && str.endsWith(suffix))
+        {
+            auto str2 = str.mid(prefix.size(), str.size() - prefix.size() - suffix.size());
+            opentrack_meta item(str2, lib);
+            ret.push_back(item);
+        }
+    }
+
+    return ret;
+}
+
+opentrack_ctx::opentrack_ctx(int argc, char** argv, void* window_parent) :
+    app(argc, argv),
+    meta_list(list_files("opentrack-tracker-")),
+    fake_frame(window_parent)
+{
+    const int count = meta_list.size();
+    list = new char*[count + 1];
+    for (int i = 0; i < count; i++)
+    {
+        QByteArray tmp = meta_list.at(i).path.toUtf8();
+        int len = tmp.size();
+        auto foo = new char[len+1];
+        for (int j = 0; j < len; j++)
+            foo[j] = tmp.at(j);
+        foo[len] = '\0';
+        list[i] = foo;
+    }
+    list[count] = NULL;
+}
+
+opentrack_ctx::~opentrack_ctx()
+{
+    for (int i = 0; list[i]; i++)
+    {
+        delete[] list[i];
+    }
+    delete[] list;
+}
+
+extern "C"
+{
+
+OPENTRACK_EXPORT const char** opentrack_enum_trackers(opentrack ctx)
+{
+    return const_cast<const char**>(ctx->list);
+}
+
+OPENTRACK_EXPORT opentrack  opentrack_make_ctx(int argc, char** argv, void* window_parent)
+{
+    return new opentrack_ctx(argc, argv, window_parent);
+}
+
+OPENTRACK_EXPORT void  opentrack_finalize_ctx(opentrack foo)
+{
+    delete foo;
+}
+
+}
+
diff --git a/opentrack-api/gnuc-version-script.txt b/opentrack-api/gnuc-version-script.txt
new file mode 100644
index 00000000..cd3a568d
--- /dev/null
+++ b/opentrack-api/gnuc-version-script.txt
@@ -0,0 +1,12 @@
+{
+ global:
+     opentrack_make_ctx;
+     opentrack_finalize_ctx;
+     opentrack_enum_trackers;
+     opentrack_make_tracker;
+     opentrack_tracker_start;
+     opentrack_tracker_tick;
+     opentrack_finalize_tracker;
+ local:
+   *;
+};
diff --git a/opentrack-api/opentrack-guts.h b/opentrack-api/opentrack-guts.h
new file mode 100644
index 00000000..c8e3309a
--- /dev/null
+++ b/opentrack-api/opentrack-guts.h
@@ -0,0 +1,57 @@
+#pragma once
+
+#include <QFrame>
+#include <QDir>
+#include <QList>
+#include <QStringList>
+#include <QDebug>
+#include <QIcon>
+#include <QShowEvent>
+#include <iostream>
+#include <cstring>
+#include <QString>
+#include <QApplication>
+#include "ftnoir_tracker_base/ftnoir_tracker_base.h"
+#include "facetracknoir/global-settings.h"
+#include <memory>
+
+typedef ITracker* opentrack_tracker;
+
+class opentrack_meta {
+public:
+    QString path;
+    std::shared_ptr<DynamicLibrary> lib;
+
+    opentrack_meta(QString& path, DynamicLibrary* lib) :
+        path(path), lib(lib)
+    {}
+};
+
+class MyFrame : public QFrame {
+    Q_OBJECT
+public:
+    MyFrame(void* parent)
+    {
+        if (parent == (void*) -1)
+        {
+            show();
+            setVisible(false);
+            hide();
+        }
+        else
+        {
+            create((WId) parent);
+        }
+    }
+    explicit MyFrame() {}
+};
+
+typedef class opentrack_ctx {
+public:
+    QApplication app;
+    char** list;
+    QList<opentrack_meta> meta_list;
+    MyFrame fake_frame;
+    opentrack_ctx(int argc, char** argv, void* window_parent);
+    ~opentrack_ctx();
+} *opentrack;
diff --git a/opentrack-api/opentrack.h b/opentrack-api/opentrack.h
new file mode 100644
index 00000000..88ba6cf0
--- /dev/null
+++ b/opentrack-api/opentrack.h
@@ -0,0 +1,58 @@
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+#ifndef IN_OPENTRACK
+/* opaque pointers, forward definitions */
+struct opentrack_opaque_ctx;
+typedef struct opentrack_opaque_ctx* opentrack;
+struct opentrack_opaque_tracker;
+typedef struct opentrack_opaque_tracker* opentrack_tracker;
+#endif
+
+#ifdef IN_OPENTRACK
+#   ifdef _WIN32
+#       define OPENTRACK_EXPORT __declspec(dllexport)
+#   else
+#       define OPENTRACK_EXPORT
+#   endif
+#else
+#   ifdef _WIN32
+#       define OPENTRACK_EXPORT __declspec(dllimport)
+#   else
+#       define OPENTRACK_EXPORT
+#   endif
+#endif
+
+/* for `opentrack_tracker_tick', individual headpose elts */
+#ifndef IN_OPENTRACK
+enum opentrack_dof {
+    TX = 0,
+    TY,
+    TZ,
+    Yaw,
+    Pitch,
+    Roll,
+    DOF_count
+};
+#endif
+
+OPENTRACK_EXPORT opentrack opentrack_make_ctx(int argc, char** argv, void* window_parent);
+OPENTRACK_EXPORT void opentrack_finalize_ctx(opentrack self);
+
+/* no need to free the return value; invalid to modify it */
+OPENTRACK_EXPORT const char** opentrack_enum_trackers(opentrack self);
+
+/*
+ * don't `opentrack_tracker_tick an unstarted tracker, it's invalid to do so
+ * it's also invalid to start a finalized tracker
+ */
+OPENTRACK_EXPORT opentrack_tracker opentrack_make_tracker(opentrack ctx, const char* name);
+OPENTRACK_EXPORT void  opentrack_tracker_start(opentrack self, opentrack_tracker tracker);
+OPENTRACK_EXPORT void opentrack_tracker_tick(opentrack_tracker tracker, double* headpose);
+OPENTRACK_EXPORT void opentrack_finalize_tracker(opentrack_tracker tracker);
+#ifdef __cplusplus
+}
+#endif
+
diff --git a/opentrack-api/trackers.cpp b/opentrack-api/trackers.cpp
new file mode 100644
index 00000000..5027ec1d
--- /dev/null
+++ b/opentrack-api/trackers.cpp
@@ -0,0 +1,38 @@
+#include "opentrack-guts.h"
+#include "opentrack.h"
+
+extern "C" {
+
+opentrack_tracker OPENTRACK_EXPORT opentrack_make_tracker(opentrack ctx, const char* name)
+{
+    for (int i = 0; i < ctx->meta_list.size(); i++)
+    {
+        auto meta = ctx->meta_list.at(i);
+        if (ctx->meta_list.at(i).path == name)
+        {
+            ITracker* foo = static_cast<ITracker*>(meta.lib->Constructor());
+            return foo;
+        }
+    }
+    return NULL;
+}
+
+void OPENTRACK_EXPORT opentrack_finalize_tracker(opentrack_tracker tracker)
+{
+    delete tracker;
+}
+
+void OPENTRACK_EXPORT opentrack_tracker_start(opentrack self, opentrack_tracker tracker)
+{
+    // hot damn, this is problematic!
+    // need to pass QFrame from somewhere
+    return tracker->StartTracker(&self->fake_frame);
+}
+
+void OPENTRACK_EXPORT opentrack_tracker_tick(opentrack_tracker tracker, double* headpose)
+{
+    tracker->GetHeadPoseData(headpose);
+    QApplication::processEvents(0, 5);
+}
+
+}