1 files changed, 149 insertions, 0 deletions
diff --git a/src/core/render/backend/rendertexture.cpp b/src/core/render/backend/rendertexture.cpp
new file mode 100644
index 000000000..dbb796669
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+++ b/src/core/render/backend/rendertexture.cpp
@@ -0,0 +1,149 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt3D 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.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "rendertexture.h"
+
+#include <QDebug>
+#include <QOpenGLTexture>
+#include <QOpenGLPixelTransferOptions>
+
+#include <texturedata.h>
+
+namespace Qt3D {
+
+RenderTexture::RenderTexture(Texture* peer) :
+    m_peer(peer),
+    m_gl(NULL)
+{
+}
+
+QOpenGLTexture *RenderTexture::getOrCreateGLTexture()
+{
+    if (m_gl)
+        return m_gl;
+
+    m_gl = buildGLTexture();
+
+    m_gl->allocateStorage();
+    if (!m_gl->isStorageAllocated()) {
+        qWarning() << Q_FUNC_INFO << "texture storage allocation failed";
+        return NULL;
+    }
+
+    foreach (TexImageDataPtr imgData, m_peer->imageData()) {
+        setToGLTexture(imgData);
+    } // of image data in texture iteration
+
+    if (m_peer->generateMipMaps()) {
+        m_gl->generateMipMaps();
+    }
+
+    int err = glGetError();
+    if (err)
+        qWarning() << Q_FUNC_INFO <<
+                      "GL error after generating mip-maps" << QString::number(err, 16);
+
+
+    return m_gl;
+}
+
+QOpenGLTexture *RenderTexture::buildGLTexture()
+{
+    QOpenGLTexture* glTex = new QOpenGLTexture(m_peer->target());
+    glTex->setFormat(m_peer->format());
+    glTex->setSize(m_peer->width(),
+                   m_peer->height(),
+                   m_peer->depth());
+
+    if (!glTex->create()) {
+        qWarning() << Q_FUNC_INFO << "creating QOpenGLTexture failed";
+        return NULL;
+    }
+
+    glTex->setWrapMode(m_peer->wrapMode());
+    glTex->setMinMagFilters(m_peer->minificationFilter(),
+                            m_peer->magnificationFilter());
+
+    // FIXME : make this conditional on Qt version
+    // work-around issue in QOpenGLTexture DSA emulaation which rasies
+    // an Invalid Enum error
+    glGetError();
+
+    return glTex;
+}
+
+void RenderTexture::setToGLTexture(TexImageDataPtr imgData)
+{
+    Q_ASSERT(m_gl && m_gl->isCreated() && m_gl->isStorageAllocated());
+ // ensure we don't accidently cause a detach / copy of the raw bytes
+    const QByteArray& bytes(imgData->data());
+    char* rawPtr = const_cast<char*>(bytes.constData());
+    if (imgData->isCompressed()) {
+        m_gl->setCompressedData(imgData->mipMapLevel(),
+                                imgData->layer(),
+                                imgData->cubeFace(),
+                                bytes.size(),
+                                rawPtr);
+    } else {
+        QOpenGLPixelTransferOptions uploadOptions;
+        uploadOptions.setAlignment(1);
+        m_gl->setData(imgData->mipMapLevel(),
+                      imgData->layer(),
+                      imgData->cubeFace(),
+                      imgData->pixelFormat(),
+                      imgData->pixelType(),
+                      rawPtr,
+                      &uploadOptions);
+    }
+
+    // FIXME : make this conditional on Qt version
+    // work-around issue in QOpenGLTexture DSA emulaation which rasies
+    // an Invalid Enum error
+    glGetError();
+}
+
+
+GLint RenderTexture::textureId()
+{
+    return getOrCreateGLTexture()->textureId();
+}
+
+} // namespace Qt3D