From cb6744be440f22c3bc9673f03a4b06493f3dbd69 Mon Sep 17 00:00:00 2001
From: omigamedev <omarator@gmail.com>
Date: Tue, 9 Jul 2019 01:07:13 +0200
Subject: [PATCH] move render thread to App class and add ui thread with ui
 tasks queue

---
 src/app.cpp            | 120 ++++++++++++++++++++++++
 src/app.h              |  97 +++++++++++++++++---
 src/app_vr.cpp         |  10 --
 src/canvas.cpp         |   4 -
 src/canvas_actions.cpp |   1 -
 src/main.cpp           | 201 +++++++----------------------------------
 6 files changed, 239 insertions(+), 194 deletions(-)

diff --git a/src/app.cpp b/src/app.cpp
index 9817818..fa5e55d 100644
--- a/src/app.cpp
+++ b/src/app.cpp
@@ -1019,3 +1019,123 @@ void App::rec_loop()
         }
     }
 }
+
+void App::render_thread_main()
+{
+    uint32_t count = 0;
+    render_thread_id = std::this_thread::get_id();
+    render_running = true;
+    while (render_running)
+    {
+        std::deque<std::packaged_task<void()>> working_list;
+
+        // move the task list locally to free the queue for other threads
+        {
+            std::unique_lock<std::mutex> lock(render_task_mutex);
+            render_cv.wait(lock, [this] { return render_tasklist.empty() && render_running ? false : true; });
+            working_list = std::move(render_tasklist);
+        }
+
+        // execute the tasks
+        if (!working_list.empty())
+        {
+            async_lock();
+            while (!working_list.empty())
+            {
+                //LOG("render task %d", count);
+                count++;
+                working_list.front()();
+                working_list.pop_front();
+            }
+            async_unlock();
+        }
+    }
+}
+
+void App::ui_thread_main()
+{
+    uint32_t count = 0;
+    ui_thread_id = std::this_thread::get_id();
+    ui_running = true;
+    auto t_start = std::chrono::high_resolution_clock::now();
+    float t_frame = 0;
+    float t_fps_counter = 0;
+    int rendered_frames = 0;
+    while (ui_running)
+    {
+        std::deque<std::packaged_task<void()>> working_list;
+
+        // move the task list locally to free the queue for other threads
+        {
+            std::unique_lock<std::mutex> lock(ui_task_mutex);
+            ui_cv.wait(lock, [this] { return ui_tasklist.empty() && ui_running ? false : true; });
+            working_list = std::move(ui_tasklist);
+        }
+
+        // execute the tasks
+        if (!working_list.empty())
+        {
+            while (!working_list.empty())
+            {
+                //LOG("ui task %d", count);
+                count++;
+                working_list.front()();
+                working_list.pop_front();
+            }
+        }
+
+        auto t_now = std::chrono::high_resolution_clock::now();
+        float dt = std::chrono::duration<float>(t_now - t_start).count();
+
+        // increment timers
+        t_frame += dt;
+        t_fps_counter += dt;
+
+        if (t_fps_counter > 1.f)
+        {
+
+        }
+
+        tick(dt);
+
+        if (redraw)
+        {
+            update(t_frame);
+            render_task([this, t_frame]
+            {
+                glBindFramebuffer(GL_FRAMEBUFFER, 0);
+                clear();
+                draw(t_frame);
+                async_swap();
+            });
+            t_frame = 0;
+            rendered_frames++;
+        }
+    }
+}
+
+void App::render_thread_start()
+{
+    render_thread = std::thread(&App::render_thread_main, this);
+}
+
+void App::render_thread_stop()
+{
+    render_running = false;
+    render_cv.notify_all();
+    if (render_thread.joinable())
+        render_thread.join();
+}
+
+void App::ui_thread_start()
+{
+    ui_thread = std::thread(&App::ui_thread_main, this);
+}
+
+void App::ui_thread_stop()
+{
+    ui_running = false;
+    ui_cv.notify_all();
+    if (ui_thread.joinable())
+        ui_thread.join();
+}
diff --git a/src/app.h b/src/app.h
index 1816f69..cc77dc2 100644
--- a/src/app.h
+++ b/src/app.h
@@ -73,7 +73,7 @@ public:
     std::mutex rec_mutex;
     std::condition_variable rec_cv;
     std::deque<std::unique_ptr<uint8_t[]>> rec_frames;
-    
+
     RTT uirtt;
     Sampler sampler;
     Sampler sampler_stencil;
@@ -251,11 +251,23 @@ public:
 
     void cmd_convert(std::string pano_path, std::string out_path);
 
+    //////////////////////////////////////////////////////////////////////////
+    // RENDER THREAD
+    //////////////////////////////////////////////////////////////////////////
+
+    std::deque<std::packaged_task<void()>> render_tasklist;
+    std::mutex render_task_mutex;
+    std::condition_variable render_cv;
+    std::thread render_thread;
+    std::thread::id render_thread_id;
+    bool render_running = false;
+    void render_thread_main();
+    void render_thread_start();
+    void render_thread_stop();
+
     bool is_render_thread()
     {
-        extern std::thread::id render_thread_id;
-        extern std::thread::id gl_thread;
-        return std::this_thread::get_id() == render_thread_id || std::this_thread::get_id() == gl_thread;
+        return std::this_thread::get_id() == render_thread_id;
     }
 
     // don't capture a reference to this ptr as the object may be destroyed
@@ -264,9 +276,6 @@ public:
     std::future<R> render_task_async(T task)
     {
 #ifdef _WIN32
-        extern std::deque<std::packaged_task<R()>> render_tasklist;
-        extern std::mutex render_task_mutex;
-        extern std::condition_variable render_cv;
         std::packaged_task<R()> pt(task);
         std::future<R> f = pt.get_future();
         if (is_render_thread())
@@ -289,9 +298,6 @@ public:
     R render_task(T task)
     {
 #ifdef _WIN32
-        extern std::deque<std::packaged_task<R()>> render_tasklist;
-        extern std::mutex render_task_mutex;
-        extern std::condition_variable render_cv;
         std::packaged_task<R()> pt(task);
         std::future<R> f = pt.get_future();
         if (is_render_thread())
@@ -306,7 +312,7 @@ public:
             }
             render_cv.notify_all();
         }
-        return f.get();
+        return render_running ? f.get() : R();
 #endif // _WIN32
     }
 
@@ -315,4 +321,73 @@ public:
         render_task([] {});
     }
 
+    //////////////////////////////////////////////////////////////////////////
+    // UI THREAD
+    //////////////////////////////////////////////////////////////////////////
+
+    std::deque<std::packaged_task<void()>> ui_tasklist;
+    std::mutex ui_task_mutex;
+    std::condition_variable ui_cv;
+    std::thread ui_thread;
+    std::thread::id ui_thread_id;
+    bool ui_running = false;
+    void ui_thread_main();
+    void ui_thread_start();
+    void ui_thread_stop();
+
+    bool is_ui_thread()
+    {
+        return std::this_thread::get_id() == ui_thread_id;
+    }
+
+    // don't capture a reference to this ptr as the object may be destroyed
+    // by the time the task is executed
+    template<typename T, typename R = std::result_of<T()>::type>
+    std::future<R> ui_task_async(T task)
+    {
+#ifdef _WIN32
+        std::packaged_task<R()> pt(task);
+        std::future<R> f = pt.get_future();
+        if (is_ui_thread())
+        {
+            pt();
+        }
+        else
+        {
+            {
+                std::lock_guard<std::mutex> lock(ui_task_mutex);
+                ui_tasklist.push_back(std::move(pt));
+            }
+            ui_cv.notify_all();
+        }
+        return f;
+#endif // _WIN32
+    }
+
+    template<typename T, typename R = std::result_of<T()>::type>
+    R ui_task(T task)
+    {
+#ifdef _WIN32
+        std::packaged_task<R()> pt(task);
+        std::future<R> f = pt.get_future();
+        if (is_ui_thread())
+        {
+            pt();
+        }
+        else
+        {
+            {
+                std::lock_guard<std::mutex> lock(ui_task_mutex);
+                ui_tasklist.push_back(std::move(pt));
+            }
+            ui_cv.notify_all();
+        }
+        return ui_running ? f.get() : R();
+#endif // _WIN32
+    }
+
+    void ui_sync()
+    {
+        ui_task([] {});
+    }
 };
diff --git a/src/app_vr.cpp b/src/app_vr.cpp
index 767c5dc..22d25b0 100644
--- a/src/app_vr.cpp
+++ b/src/app_vr.cpp
@@ -6,7 +6,6 @@
 #ifdef _WIN32
 bool win32_vr_start();
 void win32_vr_stop();
-void win32_render_thread_notify();
 #endif
 
 bool trigger_down = false;
@@ -86,9 +85,6 @@ void App::vr_update(float dt)
                 mouse_move(controller_cursor.x, controller_cursor.y, 1.f, kEventSource::Mouse, false);
                 async_end();
                 ui_inside = true;
-#ifdef _WIN32
-                win32_render_thread_notify();
-#endif
             }
         }
     }
@@ -122,17 +118,11 @@ void App::vr_analog(const VRController& c, VRController::kButton b, VRController
             {
                 mouse_down(0, controller_cursor.x, controller_cursor.y, 1.f, kEventSource::Mouse, false);
                 ui_capture = true;
-#ifdef _WIN32
-                win32_render_thread_notify();
-#endif
             }
             else
             {
                 mouse_up(0, controller_cursor.x, controller_cursor.y, kEventSource::Mouse, false);
                 ui_capture = false;
-#ifdef _WIN32
-                win32_render_thread_notify();
-#endif
             }
             async_end();
         }
diff --git a/src/canvas.cpp b/src/canvas.cpp
index a28ae70..0b5a5ae 100644
--- a/src/canvas.cpp
+++ b/src/canvas.cpp
@@ -2845,8 +2845,6 @@ void Canvas::draw_objects_direct(std::function<void(const glm::mat4& camera, con
         glViewport(vp[0], vp[1], vp[2], vp[3]);
         glClearColor(cc[0], cc[1], cc[2], cc[3]);
         glActiveTexture(GL_TEXTURE0);
-
-        draw_merge();
     });
 }
 
@@ -2940,8 +2938,6 @@ void Canvas::draw_objects(std::function<void(const glm::mat4& camera, const glm:
         glViewport(vp[0], vp[1], vp[2], vp[3]);
         glClearColor(cc[0], cc[1], cc[2], cc[3]);
         glActiveTexture(GL_TEXTURE0);
-
-        draw_merge();
     });
 }
 
diff --git a/src/canvas_actions.cpp b/src/canvas_actions.cpp
index fa2ec60..ff1c7ed 100644
--- a/src/canvas_actions.cpp
+++ b/src/canvas_actions.cpp
@@ -46,7 +46,6 @@ void ActionStroke::undo()
             LOG("undo invalid box size (%d, %d)", (int)box_sz.x, (int)box_sz.y);
         }
     }
-    m_canvas->draw_merge();
 }
 
 size_t ActionStroke::memory()
diff --git a/src/main.cpp b/src/main.cpp
index 34a721a..4c0d711 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -33,23 +33,11 @@ std::thread::id gl_thread;
 std::map<kKey, int> vkey_map;
 
 std::thread hmd_renderer;
-std::thread ui_renderer;
 int vr_frames = 0;
 int running = -1;
 int vr_running = 0;
-std::mutex ui_render_mutex;
-std::condition_variable ui_render_cv;
-
-std::deque<std::packaged_task<void()>> render_tasklist;
-std::mutex render_task_mutex;
-std::condition_variable render_cv;
-std::thread render_thread;
-std::thread::id render_thread_id;
-bool render_running = false;
 
 int gl_count = 0;
-std::deque<std::packaged_task<void()>> tasklist;
-std::mutex task_mutex;
 std::deque<std::packaged_task<void()>> main_tasklist;
 std::mutex main_task_mutex;
 float timer_stylus = 0;
@@ -119,63 +107,6 @@ void destroy_window()
     });
 }
 
-bool is_render_thread()
-{
-    extern std::thread::id render_thread_id;
-    extern std::thread::id gl_thread;
-    return std::this_thread::get_id() == render_thread_id || std::this_thread::get_id() == gl_thread;
-}
-
-template<typename T, typename R = std::result_of<T()>::type>
-std::future<R> render_task_async(T task)
-{
-#ifdef _WIN32
-    extern std::deque<std::packaged_task<R()>> render_tasklist;
-    extern std::mutex render_task_mutex;
-    extern std::condition_variable render_cv;
-    std::packaged_task<R()> pt(task);
-    std::future<R> f = pt.get_future();
-    if (is_render_thread())
-    {
-        pt();
-    }
-    else
-    {
-        {
-            std::lock_guard<std::mutex> lock(render_task_mutex);
-            render_tasklist.push_back(std::move(pt));
-        }
-        render_cv.notify_all();
-    }
-    return f;
-#endif // _WIN32
-}
-
-template<typename T, typename R = std::result_of<T()>::type>
-R render_task(T task)
-{
-#ifdef _WIN32
-    extern std::deque<std::packaged_task<R()>> render_tasklist;
-    extern std::mutex render_task_mutex;
-    extern std::condition_variable render_cv;
-    std::packaged_task<R()> pt(task);
-    std::future<R> f = pt.get_future();
-    if (is_render_thread())
-    {
-        pt();
-    }
-    else
-    {
-        {
-            std::lock_guard<std::mutex> lock(render_task_mutex);
-            render_tasklist.push_back(std::move(pt));
-        }
-        render_cv.notify_all();
-    }
-    return f.get();
-#endif // _WIN32
-}
-
 void async_lock()
 {
     //std::lock_guard<std::mutex> _lock(async_mutex);
@@ -228,11 +159,6 @@ void async_unlock()
     }
 }
 
-void win32_render_thread_notify()
-{
-    ui_render_cv.notify_all();
-}
-
 void win32_show_cursor(bool visible)
 {
     std::lock_guard<std::mutex> lock(main_task_mutex);
@@ -781,46 +707,6 @@ BOOL UnadjustWindowRectEx(LPRECT prc, DWORD dwStyle, BOOL fMenu, DWORD dwExStyle
     return fRc;
 }
 
-void render_thread_main()
-{
-    uint32_t count = 0;
-    render_thread_id = std::this_thread::get_id();
-    render_running = true;
-    while (render_running == 1)
-    {
-        std::deque<std::packaged_task<void()>> working_list;
-
-        // move the task list locally to free the queue for other threads
-        {
-            std::unique_lock<std::mutex> lock(render_task_mutex);
-            render_cv.wait(lock, [] { return render_tasklist.empty() && render_running ? false : true; });
-            working_list = std::move(render_tasklist);
-        }
-
-        //{
-        //    std::lock_guard<std::mutex> lock(task_mutex);
-        //    working_list.insert(working_list.end(),
-        //        std::make_move_iterator(tasklist.begin()),
-        //        std::make_move_iterator(tasklist.end()));
-        //    tasklist.clear();
-        //}
-
-        // execute the tasks
-        if (!working_list.empty())
-        {
-            async_lock();
-            while (!working_list.empty())
-            {
-                LOG("render task %d", count);
-                count++;
-                working_list.front()();
-                working_list.pop_front();
-            }
-            async_unlock();
-        }
-    }
-}
-
 int main(int argc, char** argv)
 {
     WNDCLASS wc;
@@ -1015,7 +901,8 @@ int main(int argc, char** argv)
     wglMakeCurrent(NULL, NULL);
 
     running = 1;
-    render_thread = std::thread(render_thread_main);
+    App::I.render_thread_start();
+    App::I.ui_thread_start();
 
     LOG("init app");
     App::I.init();
@@ -1034,6 +921,17 @@ int main(int argc, char** argv)
     SendMessage(hWnd, WM_SETICON, ICON_SMALL,
         (LPARAM)LoadIcon(GetModuleHandle(0), MAKEINTRESOURCE(IDI_ICON1)));
 
+    {
+        WINDOWPLACEMENT wp;
+        GetWindowPlacement(hWnd, &wp);
+        wp.showCmd = show_cmd;
+        SetWindowPlacement(hWnd, &wp);
+        //GetClientRect(hWnd, &clientRect);
+        //App::I.width = clientRect.right - clientRect.left;
+        //App::I.height = clientRect.bottom - clientRect.top;
+    }
+
+    /*
     ui_renderer = std::thread([&] {
         BT_SetTerminate();
         LOG("start render thread");
@@ -1041,7 +939,6 @@ int main(int argc, char** argv)
         const float target_tick_rate = 10;
         unsigned long t0 = GetTickCount64();
         unsigned long t1;
-        bool first_frame = true;
         int frames = 0;
         float one_sec = 0;
         float render_timer = 0;
@@ -1094,18 +991,6 @@ int main(int argc, char** argv)
                 }
             }
 
-            if (first_frame)
-            {
-                first_frame = false;
-                WINDOWPLACEMENT wp;
-                GetWindowPlacement(hWnd, &wp);
-                wp.showCmd = show_cmd;
-                SetWindowPlacement(hWnd, &wp);
-//                 GetClientRect(hWnd, &clientRect);
-//                 App::I.width = clientRect.right - clientRect.left;
-//                 App::I.height = clientRect.bottom - clientRect.top;
-            }
-
             App::I.tick(dt);
 
             std::unique_lock<std::mutex> lock(ui_render_mutex);
@@ -1134,7 +1019,7 @@ int main(int argc, char** argv)
             if (App::I.redraw)
             {
                 App::I.update(frame_timer);
-                render_task([frame_timer]
+                App::I.render_task([frame_timer]
                 {
                     glBindFramebuffer(GL_FRAMEBUFFER, 0);
                     App::I.clear();
@@ -1151,9 +1036,8 @@ int main(int argc, char** argv)
             //std::this_thread::sleep_for(std::chrono::milliseconds(30));
             t0 = t1;
         }
-        LOG("renderer terminated");
     });
-
+    */
     SetTimer(hWnd, 1, 500, NULL);
 
     if (start_in_vr)
@@ -1202,12 +1086,11 @@ int main(int argc, char** argv)
             }
         }
 
-        if (!tasklist.empty())
-            ui_render_cv.notify_all();
+//         if (!tasklist.empty())
+//             ui_render_cv.notify_all();
     }
     // Clean up
     WacomTablet::I.terminate();
-    render_cv.notify_all();
 
     UnregisterClass(className, hInst);
     LogRemote::I.stop();
@@ -1227,16 +1110,12 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wp, LPARAM lp)
     {
     case WM_USER_CLOSE:
         running = 0;
-        ui_render_cv.notify_all();
-        if (ui_renderer.joinable())
-            ui_renderer.join();
         if (hmd_renderer.joinable())
             hmd_renderer.join();
+        App::I.ui_thread_stop();
+        App::I.render_thread_stop();
         App::I.terminate();
         PostQuitMessage(0);
-        render_running = false;
-        if (render_thread.joinable())
-            render_thread.join();
         return 0;
     case WM_PAINT:
         App::I.redraw = true;
@@ -1246,8 +1125,7 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wp, LPARAM lp)
         break;
     case WM_CLOSE:
     {
-        std::lock_guard<std::mutex> lock(task_mutex);
-        tasklist.emplace_back([=] {
+        App::I.ui_task_async([] {
             if (App::I.request_close())
             {
                 destroy_window();
@@ -1262,8 +1140,7 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wp, LPARAM lp)
         auto h = (float)HIWORD(lp);
         if (h != 0 && running == 1)
         {
-            std::lock_guard<std::mutex> lock(task_mutex);
-            tasklist.emplace_back([=] 
+            App::I.ui_task_async([=]
             {
                 App::I.resize(w, h);
                 App::I.redraw = true;
@@ -1273,8 +1150,7 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wp, LPARAM lp)
     }
     case WM_ACTIVATE:
     {
-        std::lock_guard<std::mutex> lock(task_mutex);
-        tasklist.emplace_back([=] {
+        App::I.ui_task_async([=] {
             int active = GET_WM_ACTIVATE_STATE(wp, lp);
             WacomTablet::I.set_focus(active);
             static BYTE keys[256];
@@ -1298,8 +1174,7 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wp, LPARAM lp)
     }
 //     case WM_TOUCH:
 //     {
-//         std::lock_guard<std::mutex> lock(task_mutex);
-//         tasklist.emplace_back([=] {
+//         App::I.ui_task_async([=] {
 //             //LOG("touch");
 //         });
 //         break;
@@ -1308,8 +1183,7 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wp, LPARAM lp)
     {
         App::I.set_stylus();
         timer_stylus = 0;
-        std::lock_guard<std::mutex> lock(task_mutex);
-        tasklist.emplace_back([=] {
+        App::I.ui_task_async([=] {
             WacomTablet::I.handle_message(hWnd, msg, wp, lp);
         });
         break;
@@ -1319,8 +1193,7 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wp, LPARAM lp)
         if ((lp >> 30 & 1) == 0 &&  // ignore repeated
             !(wp == VK_TAB && App::I.keys[(int)kKey::KeyAlt])) // ignore alt+tab
         {
-            std::lock_guard<std::mutex> lock(task_mutex);
-            tasklist.emplace_back([wp] {
+            App::I.ui_task_async([wp] {
                 App::I.key_down(convert_key((int)wp));
             });
         }
@@ -1329,16 +1202,14 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wp, LPARAM lp)
     case WM_KEYUP:
         if (!(wp == VK_TAB && App::I.keys[(int)kKey::KeyAlt])) // ignore alt+tab
         {
-            std::lock_guard<std::mutex> lock(task_mutex);
-            tasklist.emplace_back([wp] {
+            App::I.ui_task_async([wp] {
                 App::I.key_up(convert_key((int)wp));
             });
         }
         break;
     case WM_CHAR:
         {
-            std::lock_guard<std::mutex> lock(task_mutex);
-            tasklist.emplace_back([wp]{
+            App::I.ui_task_async([wp]{
                 App::I.key_char((int)wp);
             });
         }
@@ -1362,8 +1233,7 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wp, LPARAM lp)
             lastPoint = { GET_X_LPARAM(lp), GET_Y_LPARAM(lp) };
 
             auto pt = lastPoint;
-            std::lock_guard<std::mutex> lock(task_mutex);
-            tasklist.emplace_back([pt, extra, p = WacomTablet::I.get_pressure()]{
+            App::I.ui_task_async([pt, extra, p = WacomTablet::I.get_pressure()]{
                 kEventSource pointer_source;
                 if (WacomTablet::I.m_ink_pen || WacomTablet::I.m_ink_touch)
                 {
@@ -1382,9 +1252,8 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wp, LPARAM lp)
     case WM_LBUTTONDOWN:
         {
             SetCapture(hWnd);
-            std::lock_guard<std::mutex> lock(task_mutex);
             auto pt = lastPoint;
-            tasklist.emplace_back([pt, extra, hWnd, p = WacomTablet::I.get_pressure()]{
+            App::I.ui_task_async([pt, extra, hWnd, p = WacomTablet::I.get_pressure()]{
                 kEventSource pointer_source;
                 if (WacomTablet::I.m_ink_pen || WacomTablet::I.m_ink_touch)
                 {
@@ -1403,9 +1272,8 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wp, LPARAM lp)
     case WM_LBUTTONUP:
         {
             ReleaseCapture();
-            std::lock_guard<std::mutex> lock(task_mutex);
             auto pt = lastPoint;
-            tasklist.emplace_back([pt, extra] {
+            App::I.ui_task_async([pt, extra] {
                 WacomTablet::I.reset_pressure();
                 kEventSource pointer_source;
                 if (WacomTablet::I.m_ink_pen || WacomTablet::I.m_ink_touch)
@@ -1425,9 +1293,8 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wp, LPARAM lp)
     case WM_RBUTTONDOWN:
         {
             SetCapture(hWnd);
-            std::lock_guard<std::mutex> lock(task_mutex);
             auto pt = lastPoint;
-            tasklist.emplace_back([pt, extra, hWnd] {
+            App::I.ui_task_async([pt, extra, hWnd] {
                 kEventSource pointer_source;
                 if (WacomTablet::I.m_ink_pen || WacomTablet::I.m_ink_touch)
                 {
@@ -1446,9 +1313,8 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wp, LPARAM lp)
     case WM_RBUTTONUP:
         {
             ReleaseCapture();
-            std::lock_guard<std::mutex> lock(task_mutex);
             auto pt = lastPoint;
-            tasklist.emplace_back([pt, extra] {
+            App::I.ui_task_async([pt, extra] {
                 kEventSource pointer_source;
                 if (WacomTablet::I.m_ink_pen || WacomTablet::I.m_ink_touch)
                 {
@@ -1471,8 +1337,7 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wp, LPARAM lp)
         pt.y = GET_Y_LPARAM(lp);
         ScreenToClient(hWnd, &pt);
         {
-            std::lock_guard<std::mutex> lock(task_mutex);
-            tasklist.emplace_back([pt, wp] {
+            App::I.ui_task_async([pt, wp] {
                 App::I.mouse_scroll((float)pt.x, (float)pt.y,
                     (float)GET_WHEEL_DELTA_WPARAM(wp) / (float)WHEEL_DELTA);
             });