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/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQuick module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qsgpkmhandler_p.h"
#include <QFile>
#include <QDebug>
#include <qendian.h>
#include <qopenglfunctions.h>
#include <qqmlfile.h>
//#define ETC_DEBUG
#ifndef GL_ETC1_RGB8_OES
#define GL_ETC1_RGB8_OES 0x8d64
#endif
#ifndef GL_COMPRESSED_RGB8_ETC2
#define GL_COMPRESSED_RGB8_ETC2 0x9274
#endif
#ifndef GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2
#define GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2 0x9276
#endif
#ifndef GL_COMPRESSED_RGBA8_ETC2_EAC
#define GL_COMPRESSED_RGBA8_ETC2_EAC 0x9278
#endif
QT_BEGIN_NAMESPACE
static const int headerSize = 16;
static unsigned int typeMap[5] = {
GL_ETC1_RGB8_OES,
GL_COMPRESSED_RGB8_ETC2,
0, // unused
GL_COMPRESSED_RGBA8_ETC2_EAC,
GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2
};
EtcTexture::EtcTexture()
: m_texture_id(0), m_uploaded(false)
{
initializeOpenGLFunctions();
}
EtcTexture::~EtcTexture()
{
if (m_texture_id)
glDeleteTextures(1, &m_texture_id);
}
int EtcTexture::textureId() const
{
if (m_texture_id == 0) {
EtcTexture *texture = const_cast<EtcTexture*>(this);
texture->glGenTextures(1, &texture->m_texture_id);
}
return m_texture_id;
}
bool EtcTexture::hasAlphaChannel() const
{
return m_type == GL_COMPRESSED_RGBA8_ETC2_EAC ||
m_type == GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2;
}
void EtcTexture::bind()
{
if (m_uploaded && m_texture_id) {
glBindTexture(GL_TEXTURE_2D, m_texture_id);
return;
}
if (m_texture_id == 0)
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
#ifndef QT_NO_DEBUG
while (glGetError() != GL_NO_ERROR) { }
#endif
QOpenGLContext *ctx = QOpenGLContext::currentContext();
Q_ASSERT(ctx != 0);
ctx->functions()->glCompressedTexImage2D(GL_TEXTURE_2D, 0, m_type,
m_size.width(), m_size.height(), 0,
(m_paddedSize.width() * m_paddedSize.height()) / 2,
m_data.data() + headerSize);
#ifndef QT_NO_DEBUG
// 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;
}
#endif
m_uploaded = true;
updateBindOptions(true);
}
class QEtcTextureFactory : public QQuickTextureFactory
{
public:
QByteArray m_data;
QSize m_size;
QSize m_paddedSize;
unsigned int m_type;
QSize textureSize() const { return m_size; }
int textureByteCount() const { return m_data.size(); }
QSGTexture *createTexture(QQuickWindow *) const {
EtcTexture *texture = new EtcTexture;
texture->m_data = m_data;
texture->m_size = m_size;
texture->m_paddedSize = m_paddedSize;
texture->m_type = m_type;
return texture;
}
};
QQuickTextureFactory *QSGPkmHandler::read(QIODevice *device)
{
QScopedPointer<QEtcTextureFactory> ret(new QEtcTextureFactory);
ret->m_data = device->readAll();
if (ret->m_data.isEmpty() || ret->m_data.size() < headerSize)
return nullptr;
const char *rawData = ret->m_data.constData();
// magic number
if (qstrncmp(rawData, "PKM ", 4) != 0)
return nullptr;
// currently ignore version (rawData + 4)
// texture type
quint16 type = qFromBigEndian<quint16>(rawData + 6);
static int typeCount = sizeof(typeMap)/sizeof(typeMap[0]);
if (type >= typeCount)
return nullptr;
ret->m_type = typeMap[type];
// texture size
ret->m_paddedSize.setWidth(qFromBigEndian<quint16>(rawData + 8));
ret->m_paddedSize.setHeight(qFromBigEndian<quint16>(rawData + 10));
if ((ret->m_paddedSize.width() * ret->m_paddedSize.height()) / 2 > ret->m_data.size() - headerSize)
return nullptr;
ret->m_size.setWidth(qFromBigEndian<quint16>(rawData + 12));
ret->m_size.setHeight(qFromBigEndian<quint16>(rawData + 14));
if (ret->m_size.isEmpty())
return nullptr;
#ifdef ETC_DEBUG
qDebug() << "requestTexture returning: " << ret->m_data.length() << "bytes; width: " << ret->m_size.width() << ", height: " << ret->m_size.height();
#endif
return ret.take();
}
QT_END_NAMESPACE
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