1 files changed, 150 insertions, 0 deletions
diff --git a/src/platformsupport/eglconvenience/qeglcompositor.cpp b/src/platformsupport/eglconvenience/qeglcompositor.cpp
new file mode 100644
index 0000000000..a38f00d4f6
--- /dev/null
+++ b/src/platformsupport/eglconvenience/qeglcompositor.cpp
@@ -0,0 +1,150 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the plugins 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui/QOpenGLContext>
+#include <QtGui/QOpenGLShaderProgram>
+#include <QtGui/QOpenGLFramebufferObject>
+#include <QtGui/private/qopengltextureblitter_p.h>
+#include <qpa/qplatformbackingstore.h>
+
+#include "qeglcompositor_p.h"
+#include "qeglplatformwindow_p.h"
+#include "qeglplatformscreen_p.h"
+
+QT_BEGIN_NAMESPACE
+
+static QEGLCompositor *compositor = 0;
+
+QEGLCompositor::QEGLCompositor()
+    : m_context(0),
+      m_window(0),
+      m_blitter(0)
+{
+    Q_ASSERT(!compositor);
+    m_updateTimer.setSingleShot(true);
+    m_updateTimer.setInterval(0);
+    connect(&m_updateTimer, SIGNAL(timeout()), SLOT(renderAll()));
+}
+
+QEGLCompositor::~QEGLCompositor()
+{
+    Q_ASSERT(compositor == this);
+    if (m_blitter) {
+        m_blitter->destroy();
+        delete m_blitter;
+    }
+    compositor = 0;
+}
+
+void QEGLCompositor::schedule(QOpenGLContext *context, QEGLPlatformWindow *window)
+{
+    m_context = context;
+    m_window = window;
+    if (!m_updateTimer.isActive())
+        m_updateTimer.start();
+}
+
+void QEGLCompositor::renderAll()
+{
+    Q_ASSERT(m_context && m_window);
+    m_context->makeCurrent(m_window->window());
+
+    if (!m_blitter) {
+        m_blitter = new QOpenGLTextureBlitter;
+        m_blitter->create();
+    }
+    m_blitter->bind();
+
+    QEGLPlatformScreen *screen = static_cast<QEGLPlatformScreen *>(m_window->screen());
+    QList<QEGLPlatformWindow *> windows = screen->windows();
+    for (int i = 0; i < windows.size(); ++i)
+        render(windows.at(i));
+
+    m_blitter->release();
+    m_context->swapBuffers(m_window->window());
+
+    for (int i = 0; i < windows.size(); ++i)
+        windows.at(i)->composited();
+}
+
+void QEGLCompositor::render(QEGLPlatformWindow *window)
+{
+    const QPlatformTextureList *textures = window->textures();
+    if (!textures)
+        return;
+
+    const QRect targetWindowRect(QPoint(0, 0), window->screen()->geometry().size());
+    glViewport(0, 0, targetWindowRect.width(), targetWindowRect.height());
+
+    for (int i = 0; i < textures->count(); ++i) {
+        uint textureId = textures->textureId(i);
+        glBindTexture(GL_TEXTURE_2D, textureId);
+        QMatrix4x4 target = QOpenGLTextureBlitter::targetTransform(textures->geometry(i),
+                                                                   targetWindowRect);
+        m_blitter->setSwizzleRB(window->isRaster());
+
+        if (textures->count() > 1 && i == textures->count() - 1) {
+            glEnable(GL_BLEND);
+            glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+            m_blitter->blit(textureId, target, QOpenGLTextureBlitter::OriginTopLeft);
+            glDisable(GL_BLEND);
+        } else if (textures->count() == 1) {
+            m_blitter->blit(textureId, target, QOpenGLTextureBlitter::OriginTopLeft);
+        } else {
+            m_blitter->blit(textureId, target, QOpenGLTextureBlitter::OriginBottomLeft);
+        }
+    }
+}
+
+QEGLCompositor *QEGLCompositor::instance()
+{
+    if (!compositor)
+        compositor = new QEGLCompositor;
+    return compositor;
+}
+
+void QEGLCompositor::destroy()
+{
+    delete compositor;
+    compositor = 0;
+}
+
+QT_END_NAMESPACE