Copy core GL functionality to QtGui with QGL -> QOpenGL naming.

Change-Id: Ibc989afa4a30dd184d41d1a1cd89f97196e48855
Reviewed-on: http://codereview.qt.nokia.com/3710
Reviewed-by: Gunnar Sletta <gunnar.sletta@nokia.com>

1 files changed, 153 insertions, 0 deletions

diff --git a/src/gui/opengl/qopenglpaintdevice.cpp b/src/gui/opengl/qopenglpaintdevice.cpp
new file mode 100644
index 0000000000..e3ff5ae1f9
--- /dev/null
+++ b/src/gui/opengl/qopenglpaintdevice.cpp
@@ -0,0 +1,153 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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, Nokia gives you certain additional
+** rights. These rights are described in the Nokia 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.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <private/qopenglpaintdevice_p.h>
+#include <private/qopenglcontext_p.h>
+#include <private/qopenglframebufferobject_p.h>
+
+#include <qopenglfunctions.h>
+
+QT_BEGIN_NAMESPACE
+
+QOpenGLPaintDevice::QOpenGLPaintDevice()
+    : m_thisFBO(0)
+{
+}
+
+QOpenGLPaintDevice::~QOpenGLPaintDevice()
+{
+}
+
+int QOpenGLPaintDevice::metric(QPaintDevice::PaintDeviceMetric metric) const
+{
+    switch(metric) {
+    case PdmWidth:
+        return size().width();
+    case PdmHeight:
+        return size().height();
+    case PdmDepth: {
+        const QSurfaceFormat f = format();
+        return f.redBufferSize() + f.greenBufferSize() + f.blueBufferSize() + f.alphaBufferSize();
+    }
+    default:
+        qWarning("QOpenGLPaintDevice::metric() - metric %d not known", metric);
+        return 0;
+    }
+}
+
+void QOpenGLPaintDevice::beginPaint()
+{
+    QOpenGLContext *ctx = QOpenGLContext::currentContext();
+
+    // Record the currently bound FBO so we can restore it again
+    // in endPaint() and bind this device's FBO
+    //
+    // Note: m_thisFBO could be zero if the paint device is not
+    // backed by an FBO (e.g. window back buffer).  But there could
+    // be a previous FBO bound to the context which we need to
+    // explicitly unbind.  Otherwise the painting will go into
+    // the previous FBO instead of to the window.
+    m_previousFBO = ctx->d_func()->current_fbo;
+
+    if (m_previousFBO != m_thisFBO) {
+        ctx->d_func()->current_fbo = m_thisFBO;
+        QOpenGLFunctions(ctx).glBindFramebuffer(GL_FRAMEBUFFER, m_thisFBO);
+    }
+
+    // Set the default fbo for the context to m_thisFBO so that
+    // if some raw GL code between beginNativePainting() and
+    // endNativePainting() calls QOpenGLFramebufferObject::release(),
+    // painting will revert to the window surface's fbo.
+    ctx->d_func()->default_fbo = m_thisFBO;
+}
+
+void QOpenGLPaintDevice::ensureActiveTarget()
+{
+    QOpenGLContext *ctx = QOpenGLContext::currentContext();
+
+    if (ctx->d_func()->current_fbo != m_thisFBO) {
+        ctx->d_func()->current_fbo = m_thisFBO;
+        QOpenGLFunctions(ctx).glBindFramebuffer(GL_FRAMEBUFFER, m_thisFBO);
+    }
+
+    ctx->d_func()->default_fbo = m_thisFBO;
+}
+
+void QOpenGLPaintDevice::endPaint()
+{
+    // Make sure the FBO bound at beginPaint is re-bound again here:
+    QOpenGLContext *ctx = QOpenGLContext::currentContext();
+
+    if (m_previousFBO != ctx->d_func()->current_fbo) {
+        ctx->d_func()->current_fbo = m_previousFBO;
+        QOpenGLFunctions(ctx).glBindFramebuffer(GL_FRAMEBUFFER, m_previousFBO);
+    }
+
+    ctx->d_func()->default_fbo = 0;
+}
+
+bool QOpenGLPaintDevice::isFlipped() const
+{
+    return false;
+}
+
+// returns the QOpenGLPaintDevice for the given QPaintDevice
+QOpenGLPaintDevice* QOpenGLPaintDevice::getDevice(QPaintDevice* pd)
+{
+    QOpenGLPaintDevice* glpd = 0;
+
+    switch(pd->devType()) {
+        case QInternal::FramebufferObject:
+            glpd = &(static_cast<QOpenGLFramebufferObject*>(pd)->d_func()->glDevice);
+            break;
+        case QInternal::Pixmap: {
+            qWarning("Pixmap type not supported for GL rendering");
+            break;
+        }
+        default:
+            qWarning("QOpenGLPaintDevice::getDevice() - Unknown device type %d", pd->devType());
+            break;
+    }
+
+    return glpd;
+}
+
+QT_END_NAMESPACE