Rewrite native context handling for QtShareGLContext

Change-Id: Ie880978f2122528789d7ec23b24bb8259eee0fb8
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

2 files changed, 204 insertions, 0 deletions

diff --git a/src/core/ozone/gl_share_context_qt.cpp b/src/core/ozone/gl_share_context_qt.cpp
new file mode 100644
index 000000000..dbfb7848f
--- /dev/null
+++ b/src/core/ozone/gl_share_context_qt.cpp
@@ -0,0 +1,105 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtWebEngine module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "gl_share_context_qt.h"
+#include <QtGui/qtgui-config.h>
+#include <qpa/qplatformnativeinterface.h>
+#include <QtGui/qopenglcontext_platform.h>
+#if QT_CONFIG(opengl)
+#include <QOpenGLContext>
+#include <QOpenGLExtraFunctions>
+#endif
+
+namespace QtWebEngineCore {
+
+QtShareGLContext::QtShareGLContext(QOpenGLContext *qtContext)
+    : gl::GLContext(nullptr), m_handle(nullptr)
+{
+#if QT_CONFIG(opengl)
+    QOpenGLContext *context = QOpenGLContext::globalShareContext();
+#if defined(Q_OS_MACOS)
+    auto *ctx = context->platformInterface<QPlatformInterface::QCocoaGLContext>();
+#endif
+#if defined(Q_OS_WIN)
+    auto *ctx = context->platformInterface<QPlatformInterface::QWGLContext>();
+#endif
+#if defined(Q_OS_LINUX)
+    auto *ctx = context->platformInterface<QPlatformInterface::QGLXContext>();
+#endif
+    if (ctx)
+        m_handle = (void *)ctx->nativeContext();
+#if QT_CONFIG(egl)
+    if (!m_handle) {
+        auto *ctx = context->platformInterface<QPlatformInterface::QEGLContext>();
+        if (ctx)
+            m_handle = (void *)ctx->nativeContext();
+    }
+#endif
+    if (!m_handle)
+        qFatal("Could not get handle for shared contex");
+#endif // QT_CONFIG(opengl)
+}
+
+unsigned int QtShareGLContext::CheckStickyGraphicsResetStatus()
+{
+#if QT_CONFIG(opengl)
+    if (QOpenGLContext *context = QOpenGLContext::globalShareContext()) {
+        if (context->format().testOption(QSurfaceFormat::ResetNotification))
+            return context->extraFunctions()->glGetGraphicsResetStatus();
+    }
+#endif
+    return 0 /*GL_NO_ERROR*/;
+}
+
+void ShareGroupQt::AboutToAddFirstContext()
+{
+#if QT_CONFIG(opengl)
+    // This currently has to be setup by ::main in all applications using QQuickWebEngineView with
+    // delegated rendering.
+    QOpenGLContext *shareContext = QOpenGLContext::globalShareContext();
+    if (!shareContext) {
+        qFatal("QWebEngine: OpenGL resource sharing is not set up in QtQuick. Please make sure to "
+               "call QtWebEngine::initialize() in your main() function before QCoreApplication is "
+               "created.");
+    }
+    m_shareContextQt = new QtShareGLContext(shareContext);
+#endif
+}
+
+} // namespace
diff --git a/src/core/ozone/gl_share_context_qt.h b/src/core/ozone/gl_share_context_qt.h
new file mode 100644
index 000000000..26e884e10
--- /dev/null
+++ b/src/core/ozone/gl_share_context_qt.h
@@ -0,0 +1,99 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtWebEngine module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef GL_SHARE_CONTEXT_QT
+#define GL_SHARE_CONTEXT_QT
+
+#include "ui/gl/gpu_timing.h"
+#include "ui/gl/gl_context.h"
+#include "ui/gl/gl_share_group.h"
+#include "qtwebenginecoreglobal.h"
+
+QT_FORWARD_DECLARE_CLASS(QOpenGLContext)
+
+namespace QtWebEngineCore {
+
+class QtShareGLContext : public gl::GLContext
+{
+
+public:
+    QtShareGLContext(QOpenGLContext *qtContext);
+    void *GetHandle() override { return m_handle; }
+    unsigned int CheckStickyGraphicsResetStatus() override;
+    // We don't care about the rest, this context shouldn't be used except for its handle.
+    bool Initialize(gl::GLSurface *, const gl::GLContextAttribs &) override
+    {
+        Q_UNREACHABLE();
+        return false;
+    }
+    bool MakeCurrent(gl::GLSurface *) override
+    {
+        Q_UNREACHABLE();
+        return false;
+    }
+    void ReleaseCurrent(gl::GLSurface *) override { Q_UNREACHABLE(); }
+    bool IsCurrent(gl::GLSurface *) override
+    {
+        Q_UNREACHABLE();
+        return false;
+    }
+    scoped_refptr<gl::GPUTimingClient> CreateGPUTimingClient() override { return nullptr; }
+    const gfx::ExtensionSet &GetExtensions() override
+    {
+        static const gfx::ExtensionSet s_emptySet;
+        return s_emptySet;
+    }
+    void ResetExtensions() override {}
+
+private:
+    void *m_handle;
+};
+
+class ShareGroupQt : public gl::GLShareGroup
+{
+
+public:
+    gl::GLContext *GetContext() override { return m_shareContextQt.get(); }
+    void AboutToAddFirstContext() override;
+
+private:
+    scoped_refptr<QtShareGLContext> m_shareContextQt;
+};
+} // namespace
+#endif