3 files changed, 191 insertions, 2 deletions
diff --git a/src/render/backend/render-backend.pri b/src/render/backend/render-backend.pri
index 8cd904efd..91efe9cd2 100644
--- a/src/render/backend/render-backend.pri
+++ b/src/render/backend/render-backend.pri
@@ -40,7 +40,8 @@ HEADERS += \
     $$PWD/shaderparameterpack_p.h \
     $$PWD/renderviewbuilder_p.h \
     $$PWD/frameprofiler_p.h \
-    $$PWD/offscreensurfacehelper_p.h
+    $$PWD/offscreensurfacehelper_p.h \
+    $$PWD/resourceaccessor_p.h
 
 SOURCES += \
     $$PWD/renderthread.cpp \
@@ -73,5 +74,6 @@ SOURCES += \
     $$PWD/uniform.cpp \
     $$PWD/shaderparameterpack.cpp \
     $$PWD/renderviewbuilder.cpp \
-    $$PWD/offscreensurfacehelper.cpp
+    $$PWD/offscreensurfacehelper.cpp \
+    $$PWD/resourceaccessor.cpp
 
diff --git a/src/render/backend/resourceaccessor.cpp b/src/render/backend/resourceaccessor.cpp
new file mode 100644
index 000000000..c02130aa9
--- /dev/null
+++ b/src/render/backend/resourceaccessor.cpp
@@ -0,0 +1,94 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt3D module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://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.LGPLv3 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.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 later 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 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "resourceaccessor_p.h"
+
+#include <Qt3DRender/qrendertargetoutput.h>
+
+#include <private/qrendertargetoutput_p.h>
+#include <private/nodemanagers_p.h>
+#include <private/texture_p.h>
+#include <private/rendertargetoutput_p.h>
+#include <private/texturedatamanager_p.h>
+#include <private/gltexturemanager_p.h>
+#include <private/managers_p.h>
+#include <private/gltexture_p.h>
+
+#include <QtCore/qmutex.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace Qt3DRender {
+namespace Render {
+
+ResourceAccessor::ResourceAccessor(NodeManagers *mgr)
+    : m_textureManager(mgr->textureManager())
+    , m_attachmentManager(mgr->attachmentManager())
+    , m_glTextureManager(mgr->glTextureManager())
+{
+
+}
+
+// called by render plugins from arbitrary thread
+bool ResourceAccessor::accessResource(Qt3DCore::QNodeId nodeId, void **handle, QMutex **lock)
+{
+    Texture *tex = m_textureManager->lookupResource(nodeId);
+    if (!tex) {
+        RenderTargetOutput *output = m_attachmentManager->lookupResource(nodeId);
+        if (!output)
+            return false;
+
+        Attachment **attachmentData = reinterpret_cast<Attachment **>(handle);
+        *attachmentData = output->attachment();
+        return true;
+    }
+    GLTexture *glTex = m_glTextureManager->lookupResource(tex->peerId());
+    if (!glTex)
+        return false;
+
+    if (glTex->isDirty())
+        return false;
+
+    QOpenGLTexture** glTextureHandle = reinterpret_cast<QOpenGLTexture **>(handle);
+    *glTextureHandle = glTex->getOrCreateGLTexture();
+    *lock = glTex->textureLock();
+    return true;
+}
+
+} // namespace Render
+} // namespace Qt3DRender
+
+QT_END_NAMESPACE
diff --git a/src/render/backend/resourceaccessor_p.h b/src/render/backend/resourceaccessor_p.h
new file mode 100644
index 000000000..653a8adda
--- /dev/null
+++ b/src/render/backend/resourceaccessor_p.h
@@ -0,0 +1,93 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd and/or its subsidiary(-ies).
+** Contact: https://www.qt.io/licensing/
+**
+** 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 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 QT3DRENDER_RENDER_RESOURCEACCESSOR_P_H
+#define QT3DRENDER_RENDER_RESOURCEACCESSOR_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of other Qt classes.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <Qt3DCore/qnodeid.h>
+
+#include <private/qt3drender_global_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QMutex;
+
+namespace Qt3DRender
+{
+namespace Render {
+
+class TextureManager;
+class AttachmentManager;
+class GLTextureManager;
+class NodeManagers;
+
+class RenderBackendResourceAccessor
+{
+public:
+    virtual bool accessResource(Qt3DCore::QNodeId nodeId, void **handle, QMutex **lock) = 0;
+};
+
+class QT3DRENDERSHARED_PRIVATE_EXPORT ResourceAccessor : public RenderBackendResourceAccessor
+{
+public:
+    ResourceAccessor(NodeManagers *mgr);
+    bool accessResource(Qt3DCore::QNodeId nodeId, void **handle, QMutex **lock) Q_DECL_FINAL;
+private:
+    GLTextureManager *m_glTextureManager;
+    TextureManager *m_textureManager;
+    AttachmentManager *m_attachmentManager;
+};
+
+} // namespace Render
+} // namespace Qt3DRender
+
+QT_END_NAMESPACE
+
+#endif // QT3DRENDER_RENDER_RESOURCEACCESSOR_P_H