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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qpkmhandler_p.h"
#include "qtexturefiledata_p.h"
#include <QFile>
#include <QDebug>
#include <QSize>
#include <qendian.h>
//#define ETC_DEBUG
QT_BEGIN_NAMESPACE
static const int qpkmh_headerSize = 16;
struct PkmType
{
quint32 glFormat;
quint32 bytesPerBlock;
};
static constexpr PkmType typeMap[5] = {
{ 0x8D64, 8 }, // GL_ETC1_RGB8_OES
{ 0x9274, 8 }, // GL_COMPRESSED_RGB8_ETC2
{ 0, 0 }, // unused (obsolete)
{ 0x9278, 16}, // GL_COMPRESSED_RGBA8_ETC2_EAC
{ 0x9276, 8 } // GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2
};
QPkmHandler::~QPkmHandler() = default;
bool QPkmHandler::canRead(const QByteArray &suffix, const QByteArray &block)
{
Q_UNUSED(suffix);
return block.startsWith("PKM ");
}
QTextureFileData QPkmHandler::read()
{
QTextureFileData texData;
if (!device())
return texData;
QByteArray fileData = device()->readAll();
if (fileData.size() < qpkmh_headerSize || !canRead(QByteArray(), fileData)) {
qCDebug(lcQtGuiTextureIO, "Invalid PKM file %s", logName().constData());
return QTextureFileData();
}
texData.setData(fileData);
const char *rawData = fileData.constData();
// ignore version (rawData + 4 & 5)
// texture type
quint16 type = qFromBigEndian<quint16>(rawData + 6);
if (type >= sizeof(typeMap)/sizeof(typeMap[0])) {
qCDebug(lcQtGuiTextureIO, "Unknown compression format in PKM file %s", logName().constData());
return QTextureFileData();
}
texData.setGLFormat(0); // 0 for compressed textures
texData.setGLInternalFormat(typeMap[type].glFormat);
//### setBaseInternalFormat
// texture size
texData.setNumLevels(1);
texData.setNumFaces(1);
const int bpb = typeMap[type].bytesPerBlock;
QSize paddedSize(qFromBigEndian<quint16>(rawData + 8), qFromBigEndian<quint16>(rawData + 10));
texData.setDataLength((paddedSize.width() / 4) * (paddedSize.height() / 4) * bpb);
QSize texSize(qFromBigEndian<quint16>(rawData + 12), qFromBigEndian<quint16>(rawData + 14));
texData.setSize(texSize);
texData.setDataOffset(qpkmh_headerSize);
if (!texData.isValid()) {
qCDebug(lcQtGuiTextureIO, "Invalid values in header of PKM file %s", logName().constData());
return QTextureFileData();
}
texData.setLogName(logName());
#ifdef ETC_DEBUG
qDebug() << "PKM file handler read" << texData;
#endif
return texData;
}
QT_END_NAMESPACE
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