1// Copyright (C) 2017 Klaralvdalens Datakonsult AB (KDAB).
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
3
4#ifndef QT3DRENDER_RENDER_BUFFERVISITOR_P_H
5#define QT3DRENDER_RENDER_BUFFERVISITOR_P_H
6
7//
8// W A R N I N G
9// -------------
10//
11// This file is not part of the Qt API. It exists for the convenience
12// of other Qt classes. This header file may change from version to
13// version without notice, or even be removed.
14//
15// We mean it.
16//
17
18#include <Qt3DCore/qnodeid.h>
19#include <Qt3DCore/qattribute.h>
20#include <Qt3DCore/private/buffervisitor_p.h>
21#include <Qt3DRender/private/trianglesvisitor_p.h>
22#include <Qt3DRender/private/attribute_p.h>
23#include <Qt3DRender/private/buffer_p.h>
24#include <Qt3DRender/private/bufferutils_p.h>
25#include <Qt3DRender/private/geometryrenderer_p.h>
26#include <Qt3DRender/private/geometry_p.h>
27#include <Qt3DRender/private/managers_p.h>
28#include <Qt3DRender/private/nodemanagers_p.h>
29
30QT_BEGIN_NAMESPACE
31
32namespace Qt3DCore {
33class QEntity;
34}
35
36namespace Qt3DRender {
37namespace Render {
38
39
40template <typename ValueType, Qt3DCore::QAttribute::VertexBaseType VertexBaseType, uint dataSize>
41class Q_AUTOTEST_EXPORT BufferVisitor : public Qt3DCore::BufferVisitor<ValueType, VertexBaseType, dataSize>
42{
43public:
44 explicit BufferVisitor(NodeManagers *manager)
45 : m_manager(manager)
46 {
47 }
48 virtual ~BufferVisitor() = default;
49
50 bool apply(Qt3DRender::Render::Attribute *attribute,
51 Qt3DRender::Render::Attribute *indexAttribute,
52 int drawVertexCount,
53 bool primitiveRestartEnabled,
54 int primitiveRestartIndex)
55 {
56 if (attribute->vertexBaseType() != VertexBaseType)
57 return false;
58 if (attribute->vertexSize() < dataSize)
59 return false;
60
61 auto data = m_manager->lookupResource<Buffer, BufferManager>(id: attribute->bufferId())->data();
62 auto vertexBuffer = BufferTypeInfo::castToType<VertexBaseType>(data, attribute->byteOffset());
63
64 if (indexAttribute) {
65 auto indexData = m_manager->lookupResource<Buffer, BufferManager>(id: indexAttribute->bufferId())->data();
66 switch (indexAttribute->vertexBaseType()) {
67 case Qt3DCore::QAttribute::UnsignedShort: {
68 auto indexBuffer = BufferTypeInfo::castToType<Qt3DCore::QAttribute::UnsignedShort>(u: indexData, byteOffset: indexAttribute->byteOffset());
69 this->traverseCoordinateIndexed(vertexBuffer, indexBuffer, attribute->byteStride(), drawVertexCount,
70 primitiveRestartEnabled, primitiveRestartIndex);
71 break;
72 }
73 case Qt3DCore::QAttribute::UnsignedInt: {
74 auto indexBuffer = BufferTypeInfo::castToType<Qt3DCore::QAttribute::UnsignedInt>(u: indexData, byteOffset: indexAttribute->byteOffset());
75 this->traverseCoordinateIndexed(vertexBuffer, indexBuffer, attribute->byteStride(), drawVertexCount,
76 primitiveRestartEnabled, primitiveRestartIndex);
77 break;
78 }
79 case Qt3DCore::QAttribute::UnsignedByte: {
80 auto indexBuffer = BufferTypeInfo::castToType<Qt3DCore::QAttribute::UnsignedByte>(u: indexData, byteOffset: indexAttribute->byteOffset());
81 this->traverseCoordinateIndexed(vertexBuffer, indexBuffer, attribute->byteStride(), drawVertexCount,
82 primitiveRestartEnabled, primitiveRestartIndex);
83 break;
84 }
85 default: Q_UNREACHABLE();
86 }
87 } else {
88 switch (dataSize) {
89 case 1: this->traverseCoordinates1(vertexBuffer, attribute->byteStride(), drawVertexCount); break;
90 case 2: this->traverseCoordinates2(vertexBuffer, attribute->byteStride(), drawVertexCount); break;
91 case 3: this->traverseCoordinates3(vertexBuffer, attribute->byteStride(), drawVertexCount); break;
92 case 4: this->traverseCoordinates4(vertexBuffer, attribute->byteStride(), drawVertexCount); break;
93 default: Q_UNREACHABLE();
94 }
95 }
96
97 return true;
98 }
99
100protected:
101 NodeManagers *m_manager;
102};
103
104typedef BufferVisitor<float, Qt3DCore::QAttribute::Float, 3> Buffer3fVisitor;
105
106} // namespace Render
107
108} // namespace Qt3DRender
109
110QT_END_NAMESPACE
111
112
113#endif // QT3DRENDER_RENDER_BUFFERVISITOR_P_H
114

source code of qt3d/src/render/backend/buffervisitor_p.h