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