tracy/profiler/src/main.cpp

#include <algorithm>
#include <assert.h>
#include <chrono>
#include <inttypes.h>
#include <imgui.h>
#include "imgui_impl_glfw.h"
#include "imgui_impl_opengl3.h"
#include <mutex>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string>
#include <unordered_map>
#include <GL/gl3w.h>
#include <GLFW/glfw3.h>
#include <memory>
#include "../nfd/nfd.h"
#include <sys/stat.h>
#include <locale.h>

#ifdef _WIN32
#  include <windows.h>
#  include <shellapi.h>
#endif

#define STB_IMAGE_IMPLEMENTATION
#define STBI_ONLY_PNG
#include "stb_image.h"

#include "../../common/TracyProtocol.hpp"
#include "../../server/tracy_flat_hash_map.hpp"
#include "../../server/tracy_pdqsort.h"
#include "../../server/TracyBadVersion.hpp"
#include "../../server/TracyFileRead.hpp"
#include "../../server/TracyImGui.hpp"
#include "../../server/TracyPrint.hpp"
#include "../../server/TracyStorage.hpp"
#include "../../server/TracyView.hpp"
#include "../../server/TracyWorker.hpp"
#include "../../server/TracyVersion.hpp"
#include "../../server/IconsFontAwesome5.h"

#include "imgui_freetype.h"
#include "Arimo.hpp"
#include "Cousine.hpp"
#include "FontAwesomeSolid.hpp"
#include "icon.hpp"
#include "ResolvService.hpp"

static void glfw_error_callback(int error, const char* description)
{
    fprintf(stderr, "Error %d: %s\n", error, description);
}

static void OpenWebpage( const char* url )
{
#ifdef _WIN32
    ShellExecuteA( nullptr, nullptr, url, nullptr, nullptr, 0 );
#elif defined __APPLE__
    char buf[1024];
    sprintf( buf, "open %s", url );
    system( buf );
#else
    char buf[1024];
    sprintf( buf, "xdg-open %s", url );
    system( buf );
#endif
}

static GLFWwindow* s_glfwWindow = nullptr;
static bool s_customTitle = false;
static void SetWindowTitleCallback( const char* title )
{
    assert( s_glfwWindow );
    glfwSetWindowTitle( s_glfwWindow, title );
    s_customTitle = true;
}

std::vector<std::unordered_map<std::string, uint64_t>::const_iterator> RebuildConnectionHistory( const std::unordered_map<std::string, uint64_t>& connHistMap )
{
    std::vector<std::unordered_map<std::string, uint64_t>::const_iterator> ret;
    ret.reserve( connHistMap.size() );
    for( auto it = connHistMap.begin(); it != connHistMap.end(); ++it )
    {
        ret.emplace_back( it );
    }
    tracy::pdqsort_branchless( ret.begin(), ret.end(), []( const auto& lhs, const auto& rhs ) { return lhs->second > rhs->second; } );
    return ret;
}

struct ClientData
{
    int64_t time;
    uint32_t protocolVersion;
    uint32_t activeTime;
    std::string procName;
    std::string address;
};

int main( int argc, char** argv )
{
    tracy::flat_hash_map<uint32_t, ClientData> clients;

    std::unique_ptr<tracy::View> view;
    int badVer = 0;

    if( argc == 2 )
    {
        auto f = std::unique_ptr<tracy::FileRead>( tracy::FileRead::Open( argv[1] ) );
        if( f )
        {
            view = std::make_unique<tracy::View>( *f );
        }
    }
    else if( argc == 3 && strcmp( argv[1], "-a" ) == 0 )
    {
        view = std::make_unique<tracy::View>( argv[2] );
    }

    char title[128];
    sprintf( title, "Tracy Profiler %i.%i.%i", tracy::Version::Major, tracy::Version::Minor, tracy::Version::Patch );

    std::string winPosFile = tracy::GetSavePath( "window.position" );
    int x = 200, y = 200, w = 1650, h = 960, maximize = 0;
    {
        FILE* f = fopen( winPosFile.c_str(), "rb" );
        if( f )
        {
            uint32_t data[5];
            fread( data, 1, sizeof( data ), f );
            fclose( f );
            x = data[0];
            y = data[1];
            w = data[2];
            h = data[3];
            maximize = data[4];
        }
        if( w <= 0 || h <= 0 )
        {
            x = 200;
            y = 200;
            w = 1650;
            h = 960;
            maximize = 0;
        }
    }

    std::string connHistFile = tracy::GetSavePath( "connection.history" );
    std::unordered_map<std::string, uint64_t> connHistMap;
    std::vector<std::unordered_map<std::string, uint64_t>::const_iterator> connHistVec;
    {
        FILE* f = fopen( connHistFile.c_str(), "rb" );
        if( f )
        {
            uint64_t sz;
            fread( &sz, 1, sizeof( sz ), f );
            for( uint64_t i=0; i<sz; i++ )
            {
                uint64_t ssz, cnt;
                fread( &ssz, 1, sizeof( ssz ), f );
                assert( ssz < 1024 );
                char tmp[1024];
                fread( tmp, 1, ssz, f );
                fread( &cnt, 1, sizeof( cnt ), f );
                connHistMap.emplace( std::string( tmp, tmp+ssz ), cnt );
            }
            fclose( f );
            connHistVec = RebuildConnectionHistory( connHistMap );
        }
    }

    // Setup window
    glfwSetErrorCallback(glfw_error_callback);
    if( !glfwInit() ) return 1;
    glfwWindowHint(GLFW_VISIBLE, 0);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
#if __APPLE__
    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
#endif
    GLFWwindow* window = glfwCreateWindow( w, h, title, NULL, NULL);
    if( !window ) return 1;

    {
        GLFWimage icon;
        icon.pixels = stbi_load_from_memory( (const stbi_uc*)Icon_data, Icon_size, &icon.width, &icon.height, nullptr, 4 );
        glfwSetWindowIcon( window, 1, &icon );
        free( icon.pixels );
    }

    glfwSetWindowPos( window, x, y );
#ifdef GLFW_MAXIMIZED
    if( maximize ) glfwMaximizeWindow( window );
#endif
    s_glfwWindow = window;
    glfwMakeContextCurrent(window);
    glfwSwapInterval(1); // Enable vsync
    gl3wInit();

    float dpiScale = 1.f;
#ifdef _WIN32
    typedef UINT(*GDFS)(void);
    GDFS getDpiForSystem = nullptr;
    HMODULE dll = GetModuleHandleW(L"user32.dll");
    if (dll != INVALID_HANDLE_VALUE)
        getDpiForSystem = (GDFS)GetProcAddress(dll, "GetDpiForSystem");
    if (getDpiForSystem)
        dpiScale = getDpiForSystem() / 96.f;
#endif

    // Setup ImGui binding
    IMGUI_CHECKVERSION();
    ImGui::CreateContext();
    ImGuiIO& io = ImGui::GetIO();
    std::string iniFileName = tracy::GetSavePath( "imgui.ini" );
    io.IniFilename = iniFileName.c_str();
    io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;

    ImGui_ImplGlfw_InitForOpenGL( window, true );
    ImGui_ImplOpenGL3_Init( "#version 150" );

    static const ImWchar rangesBasic[] = {
        0x0020, 0x00FF, // Basic Latin + Latin Supplement
        0x03BC, 0x03BC, // micro
        0x03C3, 0x03C3, // small sigma
        0,
    };
    static const ImWchar rangesIcons[] = {
        ICON_MIN_FA, ICON_MAX_FA,
        0
    };
    ImFontConfig configMerge;
    configMerge.MergeMode = true;

    io.Fonts->AddFontFromMemoryCompressedTTF( tracy::Arimo_compressed_data, tracy::Arimo_compressed_size, 15.0f * dpiScale, nullptr, rangesBasic );
    io.Fonts->AddFontFromMemoryCompressedTTF( tracy::FontAwesomeSolid_compressed_data, tracy::FontAwesomeSolid_compressed_size, 14.0f * dpiScale, &configMerge, rangesIcons );
    auto fixedWidth = io.Fonts->AddFontFromMemoryCompressedTTF( tracy::Cousine_compressed_data, tracy::Cousine_compressed_size, 15.0f * dpiScale );
    auto bigFont = io.Fonts->AddFontFromMemoryCompressedTTF( tracy::Arimo_compressed_data, tracy::Cousine_compressed_size, 20.0f * dpiScale );

    ImGuiFreeType::BuildFontAtlas( io.Fonts, ImGuiFreeType::LightHinting );

    ImGui::StyleColorsDark();
    auto& style = ImGui::GetStyle();
    style.WindowBorderSize = 1.f * dpiScale;
    style.FrameBorderSize = 1.f * dpiScale;
    style.FrameRounding = 5.f * dpiScale;
    style.ScrollbarSize *= dpiScale;
    style.Colors[ImGuiCol_ScrollbarBg] = ImVec4( 1, 1, 1, 0.03f );

    ImVec4 clear_color = ImColor(114, 144, 154);

    char addr[1024] = { "127.0.0.1" };

    std::thread loadThread;
    tracy::UdpListen* broadcastListen = nullptr;

    enum class ViewShutdown { False, True, Join };
    ViewShutdown viewShutdown = ViewShutdown::False;

    std::mutex resolvLock;
    tracy::flat_hash_map<std::string, std::string> resolvMap;
    ResolvService resolv;

    glfwShowWindow( window );

    double time = 0;
    // Main loop
    while (!glfwWindowShouldClose(window))
    {
        glfwPollEvents();

        if( glfwGetWindowAttrib( window, GLFW_ICONIFIED ) )
        {
            std::this_thread::sleep_for( std::chrono::milliseconds( 50 ) );
            continue;
        }

        int display_w, display_h;
        glfwGetFramebufferSize(window, &display_w, &display_h);

        ImGui_ImplOpenGL3_NewFrame();
        ImGui_ImplGlfw_NewFrame();
        ImGui::NewFrame();

        if( !view )
        {
            if( s_customTitle )
            {
                s_customTitle = false;
                glfwSetWindowTitle( window, title );
            }

            const auto time = std::chrono::duration_cast<std::chrono::milliseconds>( std::chrono::system_clock::now().time_since_epoch() ).count();
            if( !broadcastListen )
            {
                broadcastListen = new tracy::UdpListen();
                if( !broadcastListen->Listen( 8086 ) )
                {
                    delete broadcastListen;
                    broadcastListen = nullptr;
                }
            }
            else
            {
                tracy::IpAddress addr;
                size_t len;
                auto msg = broadcastListen->Read( len, addr );
                if( msg )
                {
                    assert( len <= sizeof( tracy::BroadcastMessage ) );
                    tracy::BroadcastMessage bm;
                    memcpy( &bm, msg, len );

                    if( bm.broadcastVersion == tracy::BroadcastVersion )
                    {
                        const uint32_t protoVer = bm.protocolVersion;
                        const auto procname = bm.programName;
                        const auto activeTime = bm.activeTime;
                        auto address = addr.GetText();

                        const auto ipNumerical = addr.GetNumber();
                        auto it = clients.find( ipNumerical );
                        if( it == clients.end() )
                        {
                            std::string ip( address );
                            resolvLock.lock();
                            if( resolvMap.find( ip ) == resolvMap.end() )
                            {
                                resolvMap.emplace( ip, ip );
                                resolv.Query( ipNumerical, [&resolvMap, &resolvLock, ip] ( std::string&& name ) {
                                    std::lock_guard<std::mutex> lock( resolvLock );
                                    auto it = resolvMap.find( ip );
                                    assert( it != resolvMap.end() );
                                    std::swap( it->second, name );
                                } );
                            }
                            resolvLock.unlock();
                            clients.emplace( addr.GetNumber(), ClientData { time, protoVer, activeTime, procname, std::move( ip ) } );
                        }
                        else
                        {
                            it->second.time = time;
                            it->second.activeTime = activeTime;
                            if( it->second.protocolVersion != protoVer ) it->second.protocolVersion = protoVer;
                            if( strcmp( it->second.procName.c_str(), procname ) != 0 ) it->second.procName = procname;
                        }
                    }
                }
                auto it = clients.begin();
                while( it != clients.end() )
                {
                    const auto diff = time - it->second.time;
                    if( diff > 4000 )  // 4s
                    {
                        it = clients.erase( it );
                    }
                    else
                    {
                        ++it;
                    }
                }
            }

            setlocale( LC_NUMERIC, "C" );
            style.Colors[ImGuiCol_WindowBg] = ImVec4( 0.129f, 0.137f, 0.11f, 1.f );
            ImGui::Begin( "Get started", nullptr, ImGuiWindowFlags_AlwaysAutoResize );
            char buf[128];
            sprintf( buf, "Tracy Profiler %i.%i.%i", tracy::Version::Major, tracy::Version::Minor, tracy::Version::Patch );
            ImGui::PushFont( bigFont );
            tracy::TextCentered( buf );
            ImGui::PopFont();
            ImGui::Spacing();
            if( ImGui::Button( ICON_FA_BOOK " Manual" ) )
            {
                OpenWebpage( "https://bitbucket.org/wolfpld/tracy/downloads/tracy.pdf" );
            }
            ImGui::SameLine();
            if( ImGui::Button( ICON_FA_GLOBE_AMERICAS " Web" ) )
            {
                OpenWebpage( "https://bitbucket.org/wolfpld/tracy" );
            }
            ImGui::SameLine();
            if( ImGui::Button( ICON_FA_COMMENT " Chat" ) )
            {
                OpenWebpage( "https://discord.gg/pk78auc" );
            }
            ImGui::SameLine();
            if( ImGui::Button( ICON_FA_VIDEO " Tutorial" ) )
            {
                ImGui::OpenPopup( "tutorial" );
            }
            if( ImGui::BeginPopup( "tutorial" ) )
            {
                if( ImGui::Selectable( ICON_FA_VIDEO " Introduction to the Tracy Profiler" ) )
                {
                    OpenWebpage( "https://www.youtube.com/watch?v=fB5B46lbapc" );
                }
                if( ImGui::Selectable( ICON_FA_VIDEO " New features in Tracy Profiler v0.3" ) )
                {
                    OpenWebpage( "https://www.youtube.com/watch?v=3SXpDpDh2Uo" );
                }
                if( ImGui::Selectable( ICON_FA_VIDEO " New features in Tracy Profiler v0.4" ) )
                {
                    OpenWebpage( "https://www.youtube.com/watch?v=eAkgkaO8B9o" );
                }
                ImGui::EndPopup();
            }
            ImGui::Separator();
            ImGui::TextUnformatted( "Client address" );
            bool connectClicked = false;
            connectClicked |= ImGui::InputTextWithHint( "###connectaddress", "Enter address", addr, 1024, ImGuiInputTextFlags_EnterReturnsTrue );
            if( !connHistVec.empty() )
            {
                ImGui::SameLine();
                if( ImGui::BeginCombo( "##frameCombo", nullptr, ImGuiComboFlags_NoPreview ) )
                {
                    int idxRemove = -1;
                    const auto sz = std::min<size_t>( 5, connHistVec.size() );
                    for( size_t i=0; i<sz; i++ )
                    {
                        const auto& str = connHistVec[i]->first;
                        if( ImGui::Selectable( str.c_str() ) )
                        {
                            memcpy( addr, str.c_str(), str.size() + 1 );
                        }
                        if( ImGui::IsItemHovered() && ImGui::IsKeyPressed( ImGui::GetKeyIndex( ImGuiKey_Delete ), false ) )
                        {
                            idxRemove = (int)i;
                        }
                    }
                    if( idxRemove >= 0 )
                    {
                        connHistMap.erase( connHistVec[idxRemove] );
                        connHistVec = RebuildConnectionHistory( connHistMap );
                    }
                    ImGui::EndCombo();
                }
            }
            connectClicked |= ImGui::Button( ICON_FA_WIFI " Connect" );
            if( connectClicked && *addr && !loadThread.joinable() )
            {
                std::string addrStr( addr );
                auto it = connHistMap.find( addrStr );
                if( it != connHistMap.end() )
                {
                    it->second++;
                }
                else
                {
                    connHistMap.emplace( std::move( addrStr ), 1 );
                }
                connHistVec = RebuildConnectionHistory( connHistMap );

                view = std::make_unique<tracy::View>( addr, fixedWidth, bigFont, SetWindowTitleCallback );
            }
            ImGui::SameLine( 0, ImGui::GetFontSize() * 2 );
            if( ImGui::Button( ICON_FA_FOLDER_OPEN " Open saved trace" ) && !loadThread.joinable() )
            {
                nfdchar_t* fn;
                auto res = NFD_OpenDialog( "tracy", nullptr, &fn );
                if( res == NFD_OKAY )
                {
                    try
                    {
                        auto f = std::shared_ptr<tracy::FileRead>( tracy::FileRead::Open( fn ) );
                        if( f )
                        {
                            loadThread = std::thread( [&view, f, &badVer, fixedWidth, bigFont] {
                                try
                                {
                                    view = std::make_unique<tracy::View>( *f, fixedWidth, bigFont, SetWindowTitleCallback );
                                }
                                catch( const tracy::UnsupportedVersion& e )
                                {
                                    badVer = e.version;
                                }
                            } );
                        }
                    }
                    catch( const tracy::NotTracyDump& )
                    {
                        badVer = -1;
                    }
                }
            }

            if( badVer != 0 )
            {
                if( loadThread.joinable() ) { loadThread.join(); }
                tracy::BadVersion( badVer );
            }

            if( !clients.empty() )
            {
                ImGui::Separator();
                ImGui::TextUnformatted( "Discovered clients:" );
                ImGui::Separator();
                static bool widthSet = false;
                ImGui::Columns( 3 );
                if( !widthSet )
                {
                    widthSet = true;
                    const auto w = ImGui::GetWindowWidth();
                    ImGui::SetColumnWidth( 0, w * 0.35f );
                    ImGui::SetColumnWidth( 1, w * 0.175f );
                    ImGui::SetColumnWidth( 2, w * 0.425f );
                }
                std::lock_guard<std::mutex> lock( resolvLock );
                for( auto& v : clients )
                {
                    const bool badProto = v.second.protocolVersion != tracy::ProtocolVersion;
                    bool sel = false;
                    const auto& name = resolvMap.find( v.second.address );
                    assert( name != resolvMap.end() );
                    ImGuiSelectableFlags flags = ImGuiSelectableFlags_SpanAllColumns;
                    if( badProto ) flags |= ImGuiSelectableFlags_Disabled;
                    if( ImGui::Selectable( name->second.c_str(), &sel, flags ) && !loadThread.joinable() )
                    {
                        view = std::make_unique<tracy::View>( v.second.address.c_str(), fixedWidth, bigFont, SetWindowTitleCallback );
                    }
                    ImGui::NextColumn();
                    const auto acttime = ( v.second.activeTime + ( time - v.second.time ) / 1000 ) * 1000000000ll;
                    if( badProto )
                    {
                        tracy::TextDisabledUnformatted( tracy::TimeToString( acttime ) );
                    }
                    else
                    {
                        ImGui::TextUnformatted( tracy::TimeToString( acttime ) );
                    }
                    ImGui::NextColumn();
                    if( badProto )
                    {
                        tracy::TextDisabledUnformatted( v.second.procName.c_str() );
                    }
                    else
                    {
                        ImGui::TextUnformatted( v.second.procName.c_str() );
                    }
                    ImGui::NextColumn();
                }
                ImGui::EndColumns();
            }

            ImGui::End();
        }
        else
        {
            if( broadcastListen )
            {
                delete broadcastListen;
                broadcastListen = nullptr;
                clients.clear();
            }
            if( loadThread.joinable() ) loadThread.join();
            view->NotifyRootWindowSize( display_w, display_h );
            if( !view->Draw() )
            {
                viewShutdown = ViewShutdown::True;
                loadThread = std::thread( [&viewShutdown, view = std::move( view )] () mutable {
                    view.reset();
                    viewShutdown = ViewShutdown::Join;
                } );
            }
        }
        auto& progress = tracy::Worker::GetLoadProgress();
        auto totalProgress = progress.total.load( std::memory_order_relaxed );
        if( totalProgress != 0 )
        {
            ImGui::OpenPopup( "Loading trace..." );
        }
        if( ImGui::BeginPopupModal( "Loading trace...", nullptr, ImGuiWindowFlags_AlwaysAutoResize ) )
        {
            tracy::TextCentered( ICON_FA_HOURGLASS_HALF );

            time += io.DeltaTime;
            tracy::DrawWaitingDots( time );

            auto currProgress = progress.progress.load( std::memory_order_relaxed );
            if( totalProgress == 0 )
            {
                ImGui::CloseCurrentPopup();
                totalProgress = currProgress;
            }
            switch( currProgress )
            {
            case tracy::LoadProgress::Initialization:
                ImGui::TextUnformatted( "Initialization..." );
                break;
            case tracy::LoadProgress::Locks:
                ImGui::TextUnformatted( "Locks..." );
                break;
            case tracy::LoadProgress::Messages:
                ImGui::TextUnformatted( "Messages..." );
                break;
            case tracy::LoadProgress::Zones:
                ImGui::TextUnformatted( "CPU zones..." );
                break;
            case tracy::LoadProgress::GpuZones:
                ImGui::TextUnformatted( "GPU zones..." );
                break;
            case tracy::LoadProgress::Plots:
                ImGui::TextUnformatted( "Plots..." );
                break;
            case tracy::LoadProgress::Memory:
                ImGui::TextUnformatted( "Memory..." );
                break;
            case tracy::LoadProgress::CallStacks:
                ImGui::TextUnformatted( "Call stacks..." );
                break;
            case tracy::LoadProgress::FrameImages:
                ImGui::TextUnformatted( "Frame images..." );
                break;
            default:
                assert( false );
                break;
            }
            ImGui::ProgressBar( float( currProgress ) / totalProgress, ImVec2( 200 * dpiScale, 0 ) );

            ImGui::TextUnformatted( "Progress..." );
            auto subTotal = progress.subTotal.load( std::memory_order_relaxed );
            auto subProgress = progress.subProgress.load( std::memory_order_relaxed );
            if( subTotal == 0 )
            {
                ImGui::ProgressBar( 1.f, ImVec2( 200 * dpiScale, 0 ) );
            }
            else
            {
                ImGui::ProgressBar( float( subProgress ) / subTotal, ImVec2( 200 * dpiScale, 0 ) );
            }
            ImGui::EndPopup();
        }
        switch( viewShutdown )
        {
        case ViewShutdown::True:
            ImGui::OpenPopup( "Capture cleanup..." );
            break;
        case ViewShutdown::Join:
            loadThread.join();
            viewShutdown = ViewShutdown::False;
            break;
        default:
            break;
        }
        if( ImGui::BeginPopupModal( "Capture cleanup...", nullptr, ImGuiWindowFlags_AlwaysAutoResize ) )
        {
            if( viewShutdown != ViewShutdown::True ) ImGui::CloseCurrentPopup();
            tracy::TextCentered( ICON_FA_BROOM );
            time += io.DeltaTime;
            tracy::DrawWaitingDots( time );
            ImGui::Text( "Please wait, cleanup is in progress" );
            ImGui::EndPopup();
        }

        // Rendering
        ImGui::Render();
        glfwMakeContextCurrent(window);
        glViewport(0, 0, display_w, display_h);
        glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
        glClear(GL_COLOR_BUFFER_BIT);
        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());

        glfwMakeContextCurrent(window);
        glfwSwapBuffers(window);

        if( !glfwGetWindowAttrib( window, GLFW_FOCUSED ) )
        {
            std::this_thread::sleep_for( std::chrono::milliseconds( 50 ) );
        }
    }

    {
        FILE* f = fopen( winPosFile.c_str(), "wb" );
        if( f )
        {
#ifdef GLFW_MAXIMIZED
            uint32_t maximized = glfwGetWindowAttrib( window, GLFW_MAXIMIZED );
            if( maximized ) glfwRestoreWindow( window );
#else
            uint32_t maximized = 0;
#endif

            glfwGetWindowPos( window, &x, &y );
            glfwGetWindowSize( window, &w, &h );

            uint32_t data[5] = { uint32_t( x ), uint32_t( y ), uint32_t( w ), uint32_t( h ), maximized };
            fwrite( data, 1, sizeof( data ), f );
            fclose( f );
        }
    }

    // Cleanup
    ImGui_ImplOpenGL3_Shutdown();
    ImGui_ImplGlfw_Shutdown();
    ImGui::DestroyContext();

    glfwDestroyWindow(window);
    glfwTerminate();

    {
        FILE* f = fopen( connHistFile.c_str(), "wb" );
        if( f )
        {
            uint64_t sz = uint64_t( connHistMap.size() );
            fwrite( &sz, 1, sizeof( uint64_t ), f );
            for( auto& v : connHistMap )
            {
                sz = uint64_t( v.first.size() );
                fwrite( &sz, 1, sizeof( uint64_t ), f );
                fwrite( v.first.c_str(), 1, sz, f );
                fwrite( &v.second, 1, sizeof( v.second ), f );
            }
            fclose( f );
        }
    }

    return 0;
}