Cleanup: Separate the sub-tree layering out of QtQuick into the scene graph

This basically renames QQuickShaderEffectTexture to QSGDefaultLayer and
introduces QSGLayer as interface to be used. QQuickShaderEffectTexture is
generic for the scene graph and has no QtQuick dependencies. The interface
separation allows scene graph backends to customize layers.

Change-Id: I9a7f37addaa4b80a34ff9a1456b0cb9b16d4e9f3
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

1 files changed, 131 insertions, 0 deletions

diff --git a/src/quick/scenegraph/qsgdefaultlayer_p.h b/src/quick/scenegraph/qsgdefaultlayer_p.h
new file mode 100644
index 0000000000..47a0448846
--- /dev/null
+++ b/src/quick/scenegraph/qsgdefaultlayer_p.h
@@ -0,0 +1,131 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtQuick 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 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.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#ifndef QSGDEFAULTLAYER_P_H
+#define QSGDEFAULTLAYER_P_H
+
+#include <private/qsgadaptationlayer_p.h>
+#include <private/qsgcontext_p.h>
+#include <qsgsimplerectnode.h>
+
+#define QSG_DEBUG_FBO_OVERLAY
+
+class Q_QUICK_PRIVATE_EXPORT QSGDefaultLayer : public QSGLayer
+{
+    Q_OBJECT
+public:
+    QSGDefaultLayer(QSGRenderContext *context);
+    ~QSGDefaultLayer();
+
+    virtual bool updateTexture();
+
+    // The item's "paint node", not effect node.
+    QSGNode *item() const { return m_item; }
+    void setItem(QSGNode *item);
+
+    void setShaderSourceNode(QSGNode *node) { m_shaderSourceNode = node; }
+
+    QRectF rect() const { return m_rect; }
+    void setRect(const QRectF &rect);
+
+    QSize size() const { return m_size; }
+    void setSize(const QSize &size);
+
+    void setHasMipmaps(bool mipmap);
+
+    void bind();
+
+    bool hasAlphaChannel() const;
+    bool hasMipmaps() const;
+    int textureId() const;
+    QSize textureSize() const { return m_size; }
+
+    GLenum format() const { return m_format; }
+    void setFormat(GLenum format);
+
+    bool live() const { return bool(m_live); }
+    void setLive(bool live);
+
+    bool recursive() const { return bool(m_recursive); }
+    void setRecursive(bool recursive);
+
+    void setDevicePixelRatio(qreal ratio) { m_device_pixel_ratio = ratio; }
+
+    void scheduleUpdate();
+
+    QImage toImage() const;
+
+public Q_SLOTS:
+    void markDirtyTexture();
+    void invalidated();
+
+private:
+    void grab();
+
+    QSGNode *m_item;
+    QSGNode *m_shaderSourceNode;
+    QRectF m_rect;
+    QSize m_size;
+    qreal m_device_pixel_ratio;
+    GLenum m_format;
+
+    QSGRenderer *m_renderer;
+    QOpenGLFramebufferObject *m_fbo;
+    QOpenGLFramebufferObject *m_secondaryFbo;
+    QSharedPointer<QSGDepthStencilBuffer> m_depthStencilBuffer;
+
+    GLuint m_transparentTexture;
+
+#ifdef QSG_DEBUG_FBO_OVERLAY
+    QSGSimpleRectNode *m_debugOverlay;
+#endif
+
+    QSGRenderContext *m_context;
+
+    uint m_mipmap : 1;
+    uint m_live : 1;
+    uint m_recursive : 1;
+    uint m_dirtyTexture : 1;
+    uint m_multisamplingChecked : 1;
+    uint m_multisampling : 1;
+    uint m_grab : 1;
+};
+
+#endif // QSGDEFAULTLAYER_P_H