1// Copyright (C) 2016 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#include "attachmentpack_p.h"
5#include <Qt3DRender/private/rendertarget_p.h>
6#include <Qt3DRender/private/rendertargetselectornode_p.h>
7
8QT_BEGIN_NAMESPACE
9
10#ifndef GL_BACK_LEFT
11#define GL_BACK_LEFT 0x0402
12#endif
13#ifndef GL_BACK_RIGHT
14#define GL_BACK_RIGHT 0x0403
15#endif
16
17namespace Qt3DRender {
18namespace Render {
19
20AttachmentPack::AttachmentPack()
21{
22}
23
24AttachmentPack::AttachmentPack(const RenderTarget *target,
25 AttachmentManager *attachmentManager,
26 const QList<QRenderTargetOutput::AttachmentPoint> &drawBuffers)
27{
28 // Copy attachments
29 const auto outputIds = target->renderOutputs();
30 for (Qt3DCore::QNodeId outputId : outputIds) {
31 const RenderTargetOutput *output = attachmentManager->lookupResource(id: outputId);
32 if (output)
33 m_attachments.push_back(x: *output->attachment());
34 }
35
36 // Sort by attachment point
37 std::sort(first: m_attachments.begin(),
38 last: m_attachments.end(),
39 comp: [] (const Attachment &a, const Attachment &b) {
40 return a.m_point < b.m_point;
41 });
42
43
44 // Create actual DrawBuffers list that is used for glDrawBuffers
45
46 // If nothing is specified, use all the attachments as draw buffers
47 if (drawBuffers.empty()) {
48 m_drawBuffers.reserve(n: m_attachments.size());
49 for (const Attachment &attachment : std::as_const(t&: m_attachments)) {
50 if ((attachment.m_point >= QRenderTargetOutput::Color0 && attachment.m_point <= QRenderTargetOutput::Color15)
51 || attachment.m_point == QRenderTargetOutput::Left
52 || attachment.m_point == QRenderTargetOutput::Right)
53 m_drawBuffers.push_back(x: attachment.m_point);
54 }
55 } else {
56 m_drawBuffers.reserve(n: drawBuffers.size());
57 for (QRenderTargetOutput::AttachmentPoint drawBuffer : drawBuffers) {
58 if ((drawBuffer >= QRenderTargetOutput::Color0 && drawBuffer <= QRenderTargetOutput::Color15)
59 || drawBuffer == QRenderTargetOutput::Left
60 || drawBuffer == QRenderTargetOutput::Right)
61 m_drawBuffers.push_back(x: drawBuffer);
62 }
63 }
64}
65
66// return index of given attachment within actual draw buffers list
67int AttachmentPack::getDrawBufferIndex(QRenderTargetOutput::AttachmentPoint attachmentPoint) const
68{
69 for (size_t i = 0; i < m_drawBuffers.size(); i++)
70 if (m_drawBuffers.at(n: i) == attachmentPoint)
71 return int(i);
72 return -1;
73}
74
75bool operator ==(const Attachment &a, const Attachment &b)
76{
77 return (a.m_name == b.m_name &&
78 a.m_mipLevel == b.m_mipLevel &&
79 a.m_layer == b.m_layer &&
80 a.m_textureUuid == b.m_textureUuid &&
81 a.m_point == b.m_point &&
82 a.m_face == b.m_face);
83}
84
85bool operator !=(const Attachment &a, const Attachment &b)
86{
87 return !(a == b);
88}
89
90bool operator ==(const AttachmentPack &packA, const AttachmentPack &packB)
91{
92 return (packA.attachments() == packB.attachments() &&
93 packA.getDrawBuffers() == packB.getDrawBuffers());
94}
95
96bool operator !=(const AttachmentPack &packA, const AttachmentPack &packB)
97{
98 return !(packA == packB);
99}
100
101} // namespace Render
102} // namespace Qt3DRender
103
104QT_END_NAMESPACE
105

source code of qt3d/src/render/backend/attachmentpack.cpp