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// Copyright (C) 2015 Paul Lemire paul.lemire350@gmail.com
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QT3DRENDER_RENDER_VISITORUTILS_P_H
#define QT3DRENDER_RENDER_VISITORUTILS_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 <QtGlobal>
#include <private/qglobal_p.h>
QT_BEGIN_NAMESPACE
namespace Qt3DRender {
namespace Render {
namespace Visitor {
template <Qt3DCore::QAttribute::VertexBaseType> struct EnumToType;
template <> struct EnumToType<Qt3DCore::QAttribute::Byte> { typedef const char type; };
template <> struct EnumToType<Qt3DCore::QAttribute::UnsignedByte> { typedef const uchar type; };
template <> struct EnumToType<Qt3DCore::QAttribute::Short> { typedef const short type; };
template <> struct EnumToType<Qt3DCore::QAttribute::UnsignedShort> { typedef const ushort type; };
template <> struct EnumToType<Qt3DCore::QAttribute::Int> { typedef const int type; };
template <> struct EnumToType<Qt3DCore::QAttribute::UnsignedInt> { typedef const uint type; };
template <> struct EnumToType<Qt3DCore::QAttribute::Float> { typedef const float type; };
template <> struct EnumToType<Qt3DCore::QAttribute::Double> { typedef const double type; };
template<Qt3DCore::QAttribute::VertexBaseType v>
inline typename EnumToType<v>::type *castToType(const QByteArray &u, uint byteOffset)
{
return reinterpret_cast< typename EnumToType<v>::type *>(u.constData() + byteOffset);
}
template<typename Func>
void processBuffer(const BufferInfo &info, Func &f)
{
switch (info.type) {
case Qt3DCore::QAttribute::Byte: f(info, castToType<Qt3DCore::QAttribute::Byte>(info.data, info.byteOffset));
return;
case Qt3DCore::QAttribute::UnsignedByte: f(info, castToType<Qt3DCore::QAttribute::UnsignedByte>(info.data, info.byteOffset));
return;
case Qt3DCore::QAttribute::Short: f(info, castToType<Qt3DCore::QAttribute::Short>(info.data, info.byteOffset));
return;
case Qt3DCore::QAttribute::UnsignedShort: f(info, castToType<Qt3DCore::QAttribute::UnsignedShort>(info.data, info.byteOffset));
return;
case Qt3DCore::QAttribute::Int: f(info, castToType<Qt3DCore::QAttribute::Int>(info.data, info.byteOffset));
return;
case Qt3DCore::QAttribute::UnsignedInt: f(info, castToType<Qt3DCore::QAttribute::UnsignedInt>(info.data, info.byteOffset));
return;
case Qt3DCore::QAttribute::Float: f(info, castToType<Qt3DCore::QAttribute::Float>(info.data, info.byteOffset));
return;
case Qt3DCore::QAttribute::Double: f(info, castToType<Qt3DCore::QAttribute::Double>(info.data, info.byteOffset));
return;
default:
return;
}
}
template<typename GeometryProvider, typename VertexExecutor, typename IndexExecutor, typename Visitor>
void visitPrimitives(NodeManagers *manager, const GeometryProvider *renderer, Visitor* visitor)
{
Geometry *geom = manager->lookupResource<Geometry, GeometryManager>(renderer->geometryId());
Attribute *positionAttribute = nullptr;
Attribute *indexAttribute = nullptr;
Buffer *positionBuffer = nullptr;
Buffer *indexBuffer = nullptr;
auto updateStride = [](BufferInfo &info, int stride) {
if (stride) {
info.byteStride = stride;
return;
}
switch (info.type) {
case Qt3DCore::QAttribute::Byte: info.byteStride = sizeof(qint8) * info.dataSize; return;
case Qt3DCore::QAttribute::UnsignedByte: info.byteStride = sizeof(quint8) * info.dataSize; return;
case Qt3DCore::QAttribute::Short: info.byteStride = sizeof(qint16) * info.dataSize; return;
case Qt3DCore::QAttribute::UnsignedShort: info.byteStride = sizeof(quint16) * info.dataSize; return;
case Qt3DCore::QAttribute::Int: info.byteStride = sizeof(qint32) * info.dataSize; return;
case Qt3DCore::QAttribute::UnsignedInt: info.byteStride = sizeof(quint32) * info.dataSize; return;
case Qt3DCore::QAttribute::Float: info.byteStride = sizeof(float) * info.dataSize; return;
case Qt3DCore::QAttribute::Double: info.byteStride = sizeof(double) * info.dataSize; return;
default: return;
}
};
if (geom) {
Qt3DRender::Render::Attribute *attribute = nullptr;
const auto attrIds = geom->attributes();
for (const Qt3DCore::QNodeId &attrId : attrIds) {
attribute = manager->lookupResource<Attribute, AttributeManager>(attrId);
if (attribute){
if (!positionAttribute && attribute->name() == Qt3DCore::QAttribute::defaultPositionAttributeName())
positionAttribute = attribute;
else if (attribute->attributeType() == Qt3DCore::QAttribute::IndexAttribute)
indexAttribute = attribute;
}
}
if (positionAttribute)
positionBuffer = manager->lookupResource<Buffer, BufferManager>(positionAttribute->bufferId());
if (indexAttribute)
indexBuffer = manager->lookupResource<Buffer, BufferManager>(indexAttribute->bufferId());
if (positionBuffer) {
BufferInfo vertexBufferInfo;
vertexBufferInfo.data = positionBuffer->data();
vertexBufferInfo.type = positionAttribute->vertexBaseType();
vertexBufferInfo.byteOffset = positionAttribute->byteOffset();
vertexBufferInfo.dataSize = positionAttribute->vertexSize();
vertexBufferInfo.count = positionAttribute->count();
updateStride(vertexBufferInfo, positionAttribute->byteStride());
if (indexBuffer) { // Indexed
BufferInfo indexBufferInfo;
indexBufferInfo.data = indexBuffer->data();
indexBufferInfo.type = indexAttribute->vertexBaseType();
indexBufferInfo.byteOffset = indexAttribute->byteOffset();
indexBufferInfo.count = indexAttribute->count();
indexBufferInfo.restartEnabled = renderer->primitiveRestartEnabled();
indexBufferInfo.restartIndexValue = renderer->restartIndexValue();
updateStride(indexBufferInfo, indexAttribute->byteStride());
IndexExecutor executor;
executor.m_vertexBufferInfo = vertexBufferInfo;
executor.m_primitiveType = static_cast<Qt3DRender::QGeometryRenderer::PrimitiveType>(renderer->primitiveType());
executor.m_visitor = visitor;
return processBuffer(indexBufferInfo, executor);
} else { // Non Indexed
// Check into which type the buffer needs to be casted
VertexExecutor executor;
executor.m_primitiveType = static_cast<Qt3DRender::QGeometryRenderer::PrimitiveType>(renderer->primitiveType());
executor.m_visitor = visitor;
return processBuffer(vertexBufferInfo, executor);
}
}
}
}
} // namespace Visitor
} // namespace Render
} // namespace Qt3DRender
QT_END_NAMESPACE
#endif // QT3DRENDER_RENDER_VISITORUTILS_P_H