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+/****************************************************************************
+**
+** Copyright (C) 2017 Klaralvdalens Datakonsult AB (KDAB).
+** 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_BUFFERVISITOR_P_H
+#define QT3DRENDER_RENDER_BUFFERVISITOR_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 <Qt3DRender/QAttribute>
+#include <Qt3DRender/private/trianglesvisitor_p.h>
+#include <Qt3DRender/private/attribute_p.h>
+#include <Qt3DRender/private/buffer_p.h>
+#include <Qt3DRender/private/bufferutils_p.h>
+#include <Qt3DRender/private/geometryrenderer_p.h>
+#include <Qt3DRender/private/geometry_p.h>
+#include <Qt3DRender/private/managers_p.h>
+#include <Qt3DRender/private/nodemanagers_p.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace Qt3DCore {
+class QEntity;
+}
+
+namespace Qt3DRender {
+namespace Render {
+
+
+template <typename ValueType, QAttribute::VertexBaseType VertexBaseType, uint dataSize>
+class Q_AUTOTEST_EXPORT BufferVisitor
+{
+public:
+ explicit BufferVisitor(NodeManagers *manager)
+ : m_manager(manager)
+ {
+ }
+ virtual ~BufferVisitor() { }
+
+ virtual void visit(uint ndx, ValueType x) {
+ Q_UNUSED(ndx); Q_UNUSED(x);
+ }
+ virtual void visit(uint ndx, ValueType x, ValueType y) {
+ Q_UNUSED(ndx); Q_UNUSED(x); Q_UNUSED(y);
+ }
+ virtual void visit(uint ndx, ValueType x, ValueType y, ValueType z) {
+ Q_UNUSED(ndx); Q_UNUSED(x); Q_UNUSED(y); Q_UNUSED(z);
+ }
+ virtual void visit(uint ndx, ValueType x, ValueType y, ValueType z, ValueType w) {
+ Q_UNUSED(ndx); Q_UNUSED(x); Q_UNUSED(y); Q_UNUSED(z); Q_UNUSED(w);
+ }
+
+ bool apply(const GeometryRenderer *renderer, const QString &attributeName)
+ {
+ if (renderer == nullptr || renderer->instanceCount() != 1) {
+ return false;
+ }
+
+ Geometry *geom = m_manager->lookupResource<Geometry, GeometryManager>(renderer->geometryId());
+
+ if (!geom)
+ return false;
+
+ Attribute *attribute = nullptr;
+
+ const auto attrIds = geom->attributes();
+ for (const Qt3DCore::QNodeId attrId : attrIds) {
+ attribute = m_manager->lookupResource<Attribute, AttributeManager>(attrId);
+ if (attribute){
+ if (attribute->name() == attributeName
+ || (attributeName == QStringLiteral("default")
+ && attribute->name() == QAttribute::defaultTextureCoordinateAttributeName())) {
+ break;
+ }
+ }
+ attribute = nullptr;
+ }
+
+ if (!attribute)
+ return false;
+
+ return apply(attribute);
+ }
+
+ bool apply(Qt3DRender::Render::Attribute *attribute)
+ {
+ if (attribute->vertexBaseType() != VertexBaseType)
+ return false;
+ if (attribute->vertexSize() < dataSize)
+ return false;
+
+ auto data = m_manager->lookupResource<Buffer, BufferManager>(attribute->bufferId())->data();
+ auto buffer = BufferTypeInfo::castToType<VertexBaseType>(data, attribute->byteOffset());
+ switch (dataSize) {
+ case 1: traverseCoordinates1(buffer, attribute->byteStride(), attribute->count()); break;
+ case 2: traverseCoordinates2(buffer, attribute->byteStride(), attribute->count()); break;
+ case 3: traverseCoordinates3(buffer, attribute->byteStride(), attribute->count()); break;
+ case 4: traverseCoordinates4(buffer, attribute->byteStride(), attribute->count()); break;
+ default: Q_UNREACHABLE();
+ }
+
+ return true;
+ }
+
+protected:
+
+ template <typename Coordinate>
+ void traverseCoordinates1(Coordinate *coordinates,
+ const uint byteStride,
+ const uint count)
+ {
+ const uint stride = byteStride / sizeof(Coordinate);
+ for (uint ndx = 0; ndx < count; ++ndx) {
+ visit(ndx, coordinates[0]);
+ coordinates += stride;
+ }
+ }
+
+ template <typename Coordinate>
+ void traverseCoordinates2(Coordinate *coordinates,
+ const uint byteStride,
+ const uint count)
+ {
+ const uint stride = byteStride / sizeof(Coordinate);
+ for (uint ndx = 0; ndx < count; ++ndx) {
+ visit(ndx, coordinates[0], coordinates[1]);
+ coordinates += stride;
+ }
+ }
+
+ template <typename Coordinate>
+ void traverseCoordinates3(Coordinate *coordinates,
+ const uint byteStride,
+ const uint count)
+ {
+ const uint stride = byteStride / sizeof(Coordinate);
+ for (uint ndx = 0; ndx < count; ++ndx) {
+ visit(ndx, coordinates[0], coordinates[1], coordinates[2]);
+ coordinates += stride;
+ }
+ }
+
+ template <typename Coordinate>
+ void traverseCoordinates4(Coordinate *coordinates,
+ const uint byteStride,
+ const uint count)
+ {
+ const uint stride = byteStride / sizeof(Coordinate);
+ for (uint ndx = 0; ndx < count; ++ndx) {
+ visit(ndx, coordinates[0], coordinates[1], coordinates[2], coordinates[3]);
+ coordinates += stride;
+ }
+ }
+
+ NodeManagers *m_manager;
+};
+
+typedef BufferVisitor<float, QAttribute::Float, 3> Buffer3fVisitor;
+
+} // namespace Render
+
+} // namespace Qt3DRender
+
+QT_END_NAMESPACE
+
+
+#endif // QT3DRENDER_RENDER_BUFFERVISITOR_P_H
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