add initial, untested opentrack-api.dll

Signed-off-by: Stanislaw Halik <sthalik@misaki.pl>

6 files changed, 274 insertions, 8 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0a4daad1..0eb1b3c7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,7 +17,7 @@ set(CMAKE_INCLUDE_CURRENT_DIR ON)
 set(CMAKE_AUTOMOC ON)
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 
-add_definitions(-DOPENTRACK_API)
+add_definitions(-DOPENTRACK_API -DIN_OPENTRACK)
 
 if(MSVC)
     add_definitions(-DNOMINMAX)
@@ -154,6 +154,9 @@ else()
 endif()
 # main app
 
+file(GLOB opentrack-lib-c "opentrack-api/*.cpp")
+file(GLOB opentrack-lib-h "opentrack-api/*.h")
+
 file(GLOB opentrack-bin-c "facetracknoir/*.cpp" "facetracknoir/*.rc")
 file(GLOB opentrack-bin-h "facetracknoir/*.h")
 file(GLOB opentrack-bin-ui "facetracknoir/*.ui")
@@ -608,6 +611,12 @@ add_executable(opentrack ${opentrack-win32-executable} ${opentrack-bin-c} ${open
 set_target_properties(opentrack PROPERTIES COMPILE_DEFINITIONS OPENTRACK_VERSION=\"${OPENTRACK__COMMIT}\")
 set(OPENTRACK_COMMIT_VERSION \"${OPENTRACK__COMMIT}\")
 configure_file("${CMAKE_SOURCE_DIR}/opentrack-version.h" "${CMAKE_BINARY_DIR}/opentrack-version.h" @ONLY NEWLINE_STYLE UNIX)
+
+add_library(opentrack-api ${opentrack-lib-c} ${opentrack-lib-h} ${opentrack-lib-moc})
+target_link_libraries(opentrack-api ${MY_QT_LIBS})
+
+set_target_properties(opentrack PROPERTIES COMPILE_DEFINITIONS OPENTRACK_VERSION=\"${OPENTRACK__COMMIT}\")
+
 if(UNIX)
     target_link_libraries(opentrack opentrack-qxt-mini)
 endif()
@@ -631,15 +640,16 @@ endif()
 target_link_libraries(opentrack opentrack-pose-widget opentrack-spline-widget ${MY_QT_LIBS} ${QXT_QXTCORE_LIB_RELEASE} ${QXT_QXTWIDGETS_LIB_RELEASE})
 if(NOT WIN32)
     target_link_libraries(opentrack dl)
+    target_link_libraries(opentrack-api dl)
 endif()
-    if(SDK_GOOGLE_BREAKPAD)
-        if(MSVC)
-            target_link_libraries(opentrack
-                "${SDK_GOOGLE_BREAKPAD}/src/client/windows/Release/lib/crash_generation_client.lib"
-                "${SDK_GOOGLE_BREAKPAD}/src/client/windows/Release/lib/exception_handler.lib"
-                "${SDK_GOOGLE_BREAKPAD}/src/client/windows/Release/lib/common.lib")
-        endif()
+if(SDK_GOOGLE_BREAKPAD)
+    if(MSVC)
+        target_link_libraries(opentrack
+            "${SDK_GOOGLE_BREAKPAD}/src/client/windows/Release/lib/crash_generation_client.lib"
+            "${SDK_GOOGLE_BREAKPAD}/src/client/windows/Release/lib/exception_handler.lib"
+            "${SDK_GOOGLE_BREAKPAD}/src/client/windows/Release/lib/common.lib")
     endif()
+endif()
 set_target_properties(opentrack PROPERTIES COMPILE_FLAGS -DOPENTRACK_MAIN)
 
 # make install
diff --git a/opentrack-api/context.cpp b/opentrack-api/context.cpp
new file mode 100644
index 00000000..100acf5c
--- /dev/null
+++ b/opentrack-api/context.cpp
@@ -0,0 +1,108 @@
+#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
+
+// shamelessly copied from core
+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(QDir& dir, QString filter)
+{
+    QList<opentrack_meta> ret;
+    QStringList filenames = dir.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;
+        }
+        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(meta, str2, lib);
+            ret.push_back(item);
+        }
+    }
+
+    return ret;
+}
+
+opentrack_ctx::opentrack_ctx(QDir& dir) :
+    dir(dir),
+    meta_list(list_files(dir, "opentrack-tracker-"))
+{
+    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"
+{
+
+const char** OPENTRACK_EXPORT opentrack_enum_trackers(opentrack ctx)
+{
+    return const_cast<const char**>(ctx->list);
+}
+
+opentrack OPENTRACK_EXPORT opentrack_make_ctx(const char *dir)
+{
+    QDir d(dir);
+    return new opentrack_ctx(d);
+}
+
+void OPENTRACK_EXPORT opentrack_finalize_ctx(opentrack foo)
+{
+    delete foo;
+}
+
+}
diff --git a/opentrack-api/opentrack-api.cpp b/opentrack-api/opentrack-api.cpp
new file mode 100644
index 00000000..acb6d823
--- /dev/null
+++ b/opentrack-api/opentrack-api.cpp
@@ -0,0 +1,13 @@
+#include "opentrack-guts.h"
+#include "opentrack.h"
+
+opentrack opentrack_make_ctx(const char *dir)
+{
+    QDir d(dir);
+    return new opentrack_ctx(d);
+}
+
+void opentrack_finalize_ctx(opentrack bye_bye)
+{
+    delete bye_bye;
+}
diff --git a/opentrack-api/opentrack-guts.h b/opentrack-api/opentrack-guts.h
new file mode 100644
index 00000000..1061d75d
--- /dev/null
+++ b/opentrack-api/opentrack-guts.h
@@ -0,0 +1,40 @@
+#pragma once
+
+#include "ftnoir_tracker_base/ftnoir_tracker_base.h"
+#include "facetracknoir/global-settings.h"
+#include <QString>
+#include <QDir>
+#include <QList>
+#include <QStringList>
+#include <QDebug>
+#include <QIcon>
+#include <iostream>
+#include <cstring>
+
+typedef ITracker* opentrack_tracker;
+
+class opentrack_meta {
+public:
+    Metadata* meta;
+    QString path;
+    DynamicLibrary* lib;
+
+    opentrack_meta(Metadata* meta, QString& path, DynamicLibrary* lib) :
+        meta(meta), path(path), lib(lib)
+    {}
+    ~opentrack_meta()
+    {
+        delete meta;
+        delete lib;
+    }
+};
+
+typedef class opentrack_ctx {
+public:
+    QDir dir;
+    char** list;
+    QList<opentrack_meta> meta_list;
+    QFrame fake_frame;
+    opentrack_ctx(QDir& dir);
+    ~opentrack_ctx();
+} *opentrack;
diff --git a/opentrack-api/opentrack.h b/opentrack-api/opentrack.h
new file mode 100644
index 00000000..afd5506b
--- /dev/null
+++ b/opentrack-api/opentrack.h
@@ -0,0 +1,57 @@
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+#ifndef IN_OPENTRACK
+    /* opaque pointers, forward definitions */
+    struct opentrack_opaque_ctx;
+    typedef opentrack_opaque_ctx* opentrack;
+    struct opentrack_opaque_tracker;
+    typedef 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 opentrack_make_ctx(const char* dir);
+    void opentrack_finalize_ctx(opentrack self);
+
+    /* no need to free the return value; invalid to modify it */
+    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_tracker opentrack_make_tracker(opentrack ctx, const char* name);
+    void opentrack_tracker_start(opentrack self, opentrack_tracker tracker);
+    int opentrack_tracker_tick(opentrack_tracker tracker, double* headpose);
+    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..2527017b
--- /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)
+{
+    QString n(name);
+    for (int i = 0; i < ctx->meta_list.size(); i++)
+    {
+        auto meta = ctx->meta_list[i];
+        if (ctx->meta_list.at(i).path == name)
+        {
+            ITracker* foo = reinterpret_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);
+}
+
+int OPENTRACK_EXPORT opentrack_tracker_tick(opentrack_tracker tracker, double* headpose)
+{
+    return tracker->GiveHeadPoseData(headpose);
+}
+
+}