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// Copyright (C) 2017 Klaralvdalens Datakonsult AB (KDAB).
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QT3DCORE_BUFFERVISITOR_P_H
#define QT3DCORE_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 <Qt3DCore/qattribute.h>
#include <Qt3DCore/qbuffer.h>
#include <Qt3DCore/private/bufferutils_p.h>
QT_BEGIN_NAMESPACE
namespace Qt3DCore {
class QEntity;
template <typename ValueType, Qt3DCore::QAttribute::VertexBaseType VertexBaseType, uint dataSize>
class Q_AUTOTEST_EXPORT BufferVisitor
{
public:
explicit BufferVisitor() = default;
virtual ~BufferVisitor() = default;
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(QAttribute *attribute,
QAttribute *indexAttribute,
int drawVertexCount,
bool primitiveRestartEnabled,
int primitiveRestartIndex)
{
if (attribute->vertexBaseType() != VertexBaseType)
return false;
if (attribute->vertexSize() < dataSize)
return false;
auto data = attribute->buffer()->data();
auto vertexBuffer = BufferTypeInfo::castToType<VertexBaseType>(data, attribute->byteOffset());
if (indexAttribute) {
auto indexData = indexAttribute->buffer()->data();
switch (indexAttribute->vertexBaseType()) {
case Qt3DCore::QAttribute::UnsignedShort: {
auto indexBuffer = BufferTypeInfo::castToType<Qt3DCore::QAttribute::UnsignedShort>(indexData, indexAttribute->byteOffset());
traverseCoordinateIndexed(vertexBuffer, indexBuffer, attribute->byteStride(), drawVertexCount,
primitiveRestartEnabled, primitiveRestartIndex);
break;
}
case Qt3DCore::QAttribute::UnsignedInt: {
auto indexBuffer = BufferTypeInfo::castToType<Qt3DCore::QAttribute::UnsignedInt>(indexData, indexAttribute->byteOffset());
traverseCoordinateIndexed(vertexBuffer, indexBuffer, attribute->byteStride(), drawVertexCount,
primitiveRestartEnabled, primitiveRestartIndex);
break;
}
case Qt3DCore::QAttribute::UnsignedByte: {
auto indexBuffer = BufferTypeInfo::castToType<Qt3DCore::QAttribute::UnsignedByte>(indexData, indexAttribute->byteOffset());
traverseCoordinateIndexed(vertexBuffer, indexBuffer, attribute->byteStride(), drawVertexCount,
primitiveRestartEnabled, primitiveRestartIndex);
break;
}
default: Q_UNREACHABLE();
}
} else {
switch (dataSize) {
case 1: traverseCoordinates1(vertexBuffer, attribute->byteStride(), drawVertexCount); break;
case 2: traverseCoordinates2(vertexBuffer, attribute->byteStride(), drawVertexCount); break;
case 3: traverseCoordinates3(vertexBuffer, attribute->byteStride(), drawVertexCount); break;
case 4: traverseCoordinates4(vertexBuffer, attribute->byteStride(), drawVertexCount); break;
default: Q_UNREACHABLE();
}
}
return true;
}
protected:
template<typename VertexBufferType, typename IndexBufferType>
void traverseCoordinateIndexed(VertexBufferType *vertexBuffer,
IndexBufferType *indexBuffer,
int vertexByteStride,
int drawVertexCount,
bool primitiveRestartEnabled,
int primitiveRestartIndex)
{
switch (dataSize) {
case 1: traverseCoordinates1Indexed(vertexBuffer, vertexByteStride, indexBuffer, drawVertexCount,
primitiveRestartEnabled, primitiveRestartIndex);
break;
case 2: traverseCoordinates2Indexed(vertexBuffer, vertexByteStride, indexBuffer, drawVertexCount,
primitiveRestartEnabled, primitiveRestartIndex);
break;
case 3: traverseCoordinates3Indexed(vertexBuffer, vertexByteStride, indexBuffer, drawVertexCount,
primitiveRestartEnabled, primitiveRestartIndex);
break;
case 4: traverseCoordinates4Indexed(vertexBuffer, vertexByteStride, indexBuffer, drawVertexCount,
primitiveRestartEnabled, primitiveRestartIndex);
break;
default: Q_UNREACHABLE();
}
}
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, typename IndexElem>
void traverseCoordinates1Indexed(Coordinate *coordinates,
const uint byteStride,
IndexElem *indices,
const uint count,
bool primitiveRestartEnabled,
int primitiveRestartIndex)
{
const uint stride = byteStride / sizeof(Coordinate);
if (primitiveRestartEnabled) {
for (uint i = 0; i < count; ++i) {
if (static_cast<int>(indices[i]) != primitiveRestartIndex) {
const uint n = stride * indices[i];
visit(i, coordinates[n]);
}
}
} else {
for (uint i = 0; i < count; ++i) {
const uint n = stride * indices[i];
visit(i, coordinates[n]);
}
}
}
template <typename Coordinate>
void traverseCoordinates2(Coordinate *coordinates,
const uint byteStride,
const uint count)
{
const uint stride = byteStride ? byteStride / sizeof(Coordinate) : 2;
for (uint ndx = 0; ndx < count; ++ndx) {
visit(ndx, coordinates[0], coordinates[1]);
coordinates += stride;
}
}
template <typename Coordinate, typename IndexElem>
void traverseCoordinates2Indexed(Coordinate *coordinates,
const uint byteStride,
IndexElem *indices,
const uint count,
bool primitiveRestartEnabled,
int primitiveRestartIndex)
{
const uint stride = byteStride ? byteStride / sizeof(Coordinate) : 2;
if (primitiveRestartEnabled) {
for (uint i = 0; i < count; ++i) {
if (static_cast<int>(indices[i]) != primitiveRestartIndex) {
const uint n = stride * indices[i];
visit(i, coordinates[n], coordinates[n + 1]);
}
}
} else {
for (uint i = 0; i < count; ++i) {
const uint n = stride * indices[i];
visit(i, coordinates[n], coordinates[n + 1]);
}
}
}
template <typename Coordinate>
void traverseCoordinates3(Coordinate *coordinates,
const uint byteStride,
const uint count)
{
const uint stride = byteStride ? byteStride / sizeof(Coordinate) : 3;
for (uint ndx = 0; ndx < count; ++ndx) {
visit(ndx, coordinates[0], coordinates[1], coordinates[2]);
coordinates += stride;
}
}
template <typename Coordinate, typename IndexElem>
void traverseCoordinates3Indexed(Coordinate *coordinates,
const uint byteStride,
IndexElem *indices,
const uint count,
bool primitiveRestartEnabled,
int primitiveRestartIndex)
{
const uint stride = byteStride ? byteStride / sizeof(Coordinate) : 3;
if (primitiveRestartEnabled) {
for (uint i = 0; i < count; ++i) {
if (static_cast<int>(indices[i]) != primitiveRestartIndex) {
const uint n = stride * indices[i];
visit(i, coordinates[n], coordinates[n + 1], coordinates[n + 2]);
}
}
} else {
for (uint i = 0; i < count; ++i) {
const uint n = stride * indices[i];
visit(i, coordinates[n], coordinates[n + 1], coordinates[n + 2]);
}
}
}
template <typename Coordinate>
void traverseCoordinates4(Coordinate *coordinates,
const uint byteStride,
const uint count)
{
const uint stride = byteStride ? byteStride / sizeof(Coordinate) : 4;
for (uint ndx = 0; ndx < count; ++ndx) {
visit(ndx, coordinates[0], coordinates[1], coordinates[2], coordinates[3]);
coordinates += stride;
}
}
template <typename Coordinate, typename IndexElem>
void traverseCoordinates4Indexed(Coordinate *coordinates,
const uint byteStride,
IndexElem *indices,
const uint count,
bool primitiveRestartEnabled,
int primitiveRestartIndex)
{
const uint stride = byteStride ? byteStride / sizeof(Coordinate) : 4;
if (primitiveRestartEnabled) {
for (uint i = 0; i < count; ++i) {
if (static_cast<int>(indices[i]) != primitiveRestartIndex) {
const uint n = stride * indices[i];
visit(i, coordinates[n], coordinates[n + 1], coordinates[n + 2], coordinates[n + 3]);
}
}
} else {
for (uint i = 0; i < count; ++i) {
const uint n = stride * indices[i];
visit(i, coordinates[n], coordinates[n + 1], coordinates[n + 2], coordinates[n + 3]);
}
}
}
};
typedef BufferVisitor<float, Qt3DCore::QAttribute::Float, 3> Buffer3fVisitor;
} // namespace Qt3DCore
QT_END_NAMESPACE
#endif // QT3DCORE_BUFFERVISITOR_P_H