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| |
| #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 headerSize = 16; |
| |
| struct PkmType |
| { |
| quint32 glFormat; |
| quint32 bytesPerBlock; |
| }; |
| |
| static 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 |
| }; |
| |
| 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() < 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); |
| 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(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 |