tdf#121247, tdf#121266 KDE5: Add basic support for OpenGL

Change-Id: Id3a5879f661a6fa51b9f9dc40af73687a8f624df
Reviewed-on: https://gerrit.libreoffice.org/65310
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>
Tested-by: Jenkins

6 files changed, 214 insertions, 4 deletions

diff --git a/vcl/Library_vclplug_qt5.mk b/vcl/Library_vclplug_qt5.mk
index cd3605720534..d51175756009 100644
--- a/vcl/Library_vclplug_qt5.mk
+++ b/vcl/Library_vclplug_qt5.mk
@@ -99,6 +99,7 @@ $(eval $(call gb_Library_add_exception_objects,vclplug_qt5,\
     vcl/qt5/Qt5MainWindow \
     vcl/qt5/Qt5Menu \
     vcl/qt5/Qt5Object \
+    vcl/qt5/Qt5OpenGLContext \
     vcl/qt5/Qt5Painter \
     vcl/qt5/Qt5Printer \
     vcl/qt5/Qt5System \
diff --git a/vcl/inc/qt5/Qt5Object.hxx b/vcl/inc/qt5/Qt5Object.hxx
index 294f4da4d9db..640c83753deb 100644
--- a/vcl/inc/qt5/Qt5Object.hxx
+++ b/vcl/inc/qt5/Qt5Object.hxx
@@ -24,14 +24,18 @@
 
 #include <QtGui/QRegion>
 
-class QWidget;
 class Qt5Frame;
+class QWidget;
+class QWindow;
 
 class Qt5Object : public SalObject
 {
+    friend class Qt5OpenGLContext;
+
     SystemEnvData m_aSystemData;
     Qt5Frame* m_pParent;
-    QWidget* m_pQWidget;
+    QWidget* m_pQWidget; // main widget, container
+    QWindow* m_pQWindow; // contained window, used for opengl rendering
     QRegion m_pRegion;
 
 public:
diff --git a/vcl/inc/qt5/Qt5OpenGLContext.hxx b/vcl/inc/qt5/Qt5OpenGLContext.hxx
new file mode 100644
index 000000000000..778df689ba65
--- /dev/null
+++ b/vcl/inc/qt5/Qt5OpenGLContext.hxx
@@ -0,0 +1,50 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <vcl/opengl/OpenGLContext.hxx>
+
+class QWindow;
+class QOpenGLContext;
+
+class Qt5OpenGLContext : public OpenGLContext
+{
+public:
+    virtual void initWindow() override;
+
+private:
+    virtual const GLWindow& getOpenGLWindow() const override { return m_aGLWin; }
+    virtual GLWindow& getModifiableOpenGLWindow() override { return m_aGLWin; }
+    virtual bool ImplInit() override;
+
+    virtual void makeCurrent() override;
+    virtual void destroyCurrentContext() override;
+    virtual bool isCurrent() override;
+    virtual bool isAnyCurrent() override;
+    virtual void resetCurrent() override;
+    virtual void swapBuffers() override;
+
+    static bool g_bAnyCurrent;
+
+    GLWindow m_aGLWin;
+
+    QWindow* m_pWindow;
+    QOpenGLContext* m_pContext;
+};
diff --git a/vcl/qt5/Qt5Instance.cxx b/vcl/qt5/Qt5Instance.cxx
index 2e21f2563d90..6564edd2241b 100644
--- a/vcl/qt5/Qt5Instance.cxx
+++ b/vcl/qt5/Qt5Instance.cxx
@@ -30,6 +30,7 @@
 #include <Qt5Frame.hxx>
 #include <Qt5Menu.hxx>
 #include <Qt5Object.hxx>
+#include <Qt5OpenGLContext.hxx>
 #include <Qt5System.hxx>
 #include <Qt5Timer.hxx>
 #include <Qt5VirtualDevice.hxx>
@@ -202,7 +203,7 @@ OUString Qt5Instance::GetConnectionIdentifier() { return OUString(); }
 
 void Qt5Instance::AddToRecentDocumentList(const OUString&, const OUString&, const OUString&) {}
 
-OpenGLContext* Qt5Instance::CreateOpenGLContext() { return nullptr; }
+OpenGLContext* Qt5Instance::CreateOpenGLContext() { return new Qt5OpenGLContext; }
 
 bool Qt5Instance::IsMainThread() const { return qApp->thread() != QThread::currentThread(); }
 
diff --git a/vcl/qt5/Qt5Object.cxx b/vcl/qt5/Qt5Object.cxx
index 4f0a92da7bf7..e498283ef1ee 100644
--- a/vcl/qt5/Qt5Object.cxx
+++ b/vcl/qt5/Qt5Object.cxx
@@ -22,15 +22,18 @@
 #include <Qt5Frame.hxx>
 
 #include <QtWidgets/QWidget>
+#include <QtGui/QWindow>
 
 Qt5Object::Qt5Object(Qt5Frame* pParent, bool bShow)
     : m_pParent(pParent)
     , m_pQWidget(nullptr)
+    , m_pQWindow(nullptr)
 {
     if (!m_pParent || !pParent->GetQWidget())
         return;
 
-    m_pQWidget = new QWidget(pParent->GetQWidget());
+    m_pQWindow = new QWindow;
+    m_pQWidget = QWidget::createWindowContainer(m_pQWindow, pParent->GetQWidget());
 
     if (bShow)
         m_pQWidget->show();
diff --git a/vcl/qt5/Qt5OpenGLContext.cxx b/vcl/qt5/Qt5OpenGLContext.cxx
new file mode 100644
index 000000000000..6f095e7cc857
--- /dev/null
+++ b/vcl/qt5/Qt5OpenGLContext.cxx
@@ -0,0 +1,151 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <Qt5OpenGLContext.hxx>
+
+#include <vcl/sysdata.hxx>
+#include <opengl/zone.hxx>
+#include <sal/log.hxx>
+
+#include <window.h>
+
+#include <Qt5Object.hxx>
+
+#include <QtGui/QOpenGLContext>
+#include <QtGui/QWindow>
+
+bool Qt5OpenGLContext::g_bAnyCurrent = false;
+
+void Qt5OpenGLContext::swapBuffers()
+{
+    OpenGLZone aZone;
+
+    if (m_pContext && m_pWindow && m_pWindow->isExposed())
+    {
+        m_pContext->swapBuffers(m_pWindow);
+    }
+
+    BuffersSwapped();
+}
+
+void Qt5OpenGLContext::resetCurrent()
+{
+    clearCurrent();
+
+    OpenGLZone aZone;
+
+    if (m_pContext)
+    {
+        m_pContext->doneCurrent();
+        g_bAnyCurrent = false;
+    }
+}
+
+bool Qt5OpenGLContext::isCurrent()
+{
+    OpenGLZone aZone;
+    return g_bAnyCurrent && (QOpenGLContext::currentContext() == m_pContext);
+}
+
+bool Qt5OpenGLContext::isAnyCurrent()
+{
+    OpenGLZone aZone;
+    return g_bAnyCurrent && (QOpenGLContext::currentContext() != nullptr);
+}
+
+bool Qt5OpenGLContext::ImplInit()
+{
+    if (!m_pWindow)
+    {
+        SAL_WARN("vcl.opengl.qt5", "failed to create window");
+        return false;
+    }
+
+    m_pWindow->setSurfaceType(QSurface::OpenGLSurface);
+    m_pWindow->create();
+
+    m_pContext = new QOpenGLContext(m_pWindow);
+    if (!m_pContext->create())
+    {
+        SAL_WARN("vcl.opengl.qt5", "failed to create context");
+        return false;
+    }
+
+    m_pContext->makeCurrent(m_pWindow);
+    g_bAnyCurrent = true;
+
+    bool bRet = InitGL();
+    InitGLDebugging();
+
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+
+    registerAsCurrent();
+
+    return bRet;
+}
+
+void Qt5OpenGLContext::makeCurrent()
+{
+    if (isCurrent())
+        return;
+
+    OpenGLZone aZone;
+
+    clearCurrent();
+
+    if (m_pContext && m_pWindow)
+    {
+        m_pContext->makeCurrent(m_pWindow);
+        g_bAnyCurrent = true;
+    }
+
+    registerAsCurrent();
+}
+
+void Qt5OpenGLContext::destroyCurrentContext()
+{
+    OpenGLZone aZone;
+
+    if (m_pContext)
+    {
+        m_pContext->doneCurrent();
+        g_bAnyCurrent = false;
+    }
+
+    if (glGetError() != GL_NO_ERROR)
+    {
+        SAL_WARN("vcl.opengl.qt5", "glError: " << glGetError());
+    }
+}
+
+void Qt5OpenGLContext::initWindow()
+{
+    if (!m_pChildWindow)
+    {
+        SystemWindowData winData = generateWinData(mpWindow, mbRequestLegacyContext);
+        m_pChildWindow = VclPtr<SystemChildWindow>::Create(mpWindow, 0, &winData, false);
+    }
+
+    if (m_pChildWindow)
+    {
+        InitChildWindow(m_pChildWindow.get());
+    }
+
+    m_pWindow = static_cast<Qt5Object*>(m_pChildWindow->ImplGetWindowImpl()->mpSysObj)->m_pQWindow;
+}