1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: http://www.qt-project.org/
**
** This file is part of the Declarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qetcprovider.h"
#include <QtDebug>
#include <QFile>
#include <qopenglfunctions.h>
#include <qopenglcontext.h>
QT_BEGIN_NAMESPACE
typedef struct {
char aName[6];
unsigned short iBlank;
/* NB: Beware endianess issues here. */
unsigned char iPaddedWidthMSB;
unsigned char iPaddedWidthLSB;
unsigned char iPaddedHeightMSB;
unsigned char iPaddedHeightLSB;
unsigned char iWidthMSB;
unsigned char iWidthLSB;
unsigned char iHeightMSB;
unsigned char iHeightLSB;
} ETCHeader;
unsigned short getWidth(ETCHeader *pHeader)
{
return (pHeader->iWidthMSB << 8) | pHeader->iWidthLSB;
}
unsigned short getHeight(ETCHeader *pHeader)
{
return (pHeader->iHeightMSB << 8) | pHeader->iHeightLSB;
}
unsigned short getPaddedWidth(ETCHeader *pHeader)
{
return (pHeader->iPaddedWidthMSB << 8) | pHeader->iPaddedWidthLSB;
}
unsigned short getPaddedHeight(ETCHeader *pHeader)
{
return (pHeader->iPaddedHeightMSB << 8) | pHeader->iPaddedHeightLSB;
}
enum {GL_ETC1_RGB8_OES=0x8d64};
EtcTexture::EtcTexture()
: m_texture_id(0)
{
}
EtcTexture::~EtcTexture()
{
if (m_texture_id)
glDeleteTextures(1, &m_texture_id);
}
void EtcTexture::bind()
{
if (m_texture_id) {
glBindTexture(GL_TEXTURE_2D, m_texture_id);
return;
}
#ifdef ETC_DEBUG
printf("EtcTextureProvider: about to update that texture...\n");
#endif
glGenTextures(1, &m_texture_id);
glBindTexture(GL_TEXTURE_2D, m_texture_id);
#ifdef ETC_DEBUG
qDebug() << "glCompressedTexImage2D, width: " << m_size.width() << "height" << m_size.height() <<
"paddedWidth: " << m_paddedSize.width() << "paddedHeight: " << m_paddedSize.height();
#endif
QOpenGLContext *ctx = QOpenGLContext::currentContext();
Q_ASSERT(ctx != 0);
ctx->functions()->glCompressedTexImage2D(GL_TEXTURE_2D, 0, GL_ETC1_RGB8_OES,
m_size.width(), m_size.height(), 0,
(m_paddedSize.width() * m_paddedSize.height()) >> 1,
m_data.data() + 16);
// Gracefully fail in case of an error...
GLuint error = glGetError();
if (error != GL_NO_ERROR) {
qDebug () << "glCompressedTexImage2D for compressed texture failed, error: " << error;
glBindTexture(GL_TEXTURE_2D, 0);
glDeleteTextures(1, &m_texture_id);
m_texture_id = 0;
return;
}
updateBindOptions(true);
}
QSize EtcTexture::textureSize() const
{
return m_size;
}
class QEtcTextureFactory : public QDeclarativeTextureFactory
{
public:
QByteArray m_data;
QSize m_size;
QSize m_paddedSize;
QSize textureSize() const {
return m_size;
}
int textureByteCount() const {
return m_data.size();
}
QSGTexture *createTexture() const {
EtcTexture *texture = new EtcTexture;
texture->m_data = m_data;
texture->m_size = m_size;
texture->m_paddedSize = m_paddedSize;
return texture;
}
};
QDeclarativeTextureFactory *QEtcProvider::requestTexture(const QString &id, QSize *size, const QSize &requestedSize)
{
Q_UNUSED(requestedSize);
QEtcTextureFactory *ret = 0;
size->setHeight(0);
size->setWidth(0);
QFile file(id);
#ifdef ETC_DEBUG
qDebug() << "requestTexture opening file: " << id;
#endif
if (file.open(QIODevice::ReadOnly)) {
ret = new QEtcTextureFactory;
ret->m_data = file.readAll();
if (!ret->m_data.isEmpty()) {
ETCHeader *pETCHeader = NULL;
pETCHeader = (ETCHeader *)ret->m_data.data();
size->setHeight(getHeight(pETCHeader));
size->setWidth(getWidth(pETCHeader));
ret->m_size = *size;
ret->m_paddedSize.setHeight(getPaddedHeight(pETCHeader));
ret->m_paddedSize.setWidth(getPaddedWidth(pETCHeader));
}
else {
delete ret;
ret = 0;
}
}
#ifdef ETC_DEBUG
if (ret)
qDebug() << "requestTexture returning: " << ret->m_data.length() << ", bytes; width: " << size->width() << ", height: " << size->height();
else
qDebug () << "File not found.";
#endif
return ret;
}
QT_END_NAMESPACE
|
