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| ** This file is part of the QtGui module of the Qt Toolkit. |
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| |
| #include "qastchandler_p.h" |
| #include "qtexturefiledata_p.h" |
| |
| #include <private/qnumeric_p.h> |
| |
| #include <QFile> |
| #include <QDebug> |
| #include <QSize> |
| |
| QT_BEGIN_NAMESPACE |
| |
| struct AstcHeader |
| { |
| quint8 magic[4]; |
| quint8 blockDimX; |
| quint8 blockDimY; |
| quint8 blockDimZ; |
| quint8 xSize[3]; |
| quint8 ySize[3]; |
| quint8 zSize[3]; |
| }; |
| |
| bool QAstcHandler::canRead(const QByteArray &suffix, const QByteArray &block) |
| { |
| Q_UNUSED(suffix) |
| |
| return block.startsWith("\x13\xAB\xA1\x5C"); |
| } |
| |
| quint32 QAstcHandler::astcGLFormat(quint8 xBlockDim, quint8 yBlockDim) const |
| { |
| static const quint32 glFormatRGBABase = 0x93B0; // GL_COMPRESSED_RGBA_ASTC_4x4_KHR |
| static const quint32 glFormatSRGBBase = 0x93D0; // GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR |
| |
| static QSize dims[14] = { |
| { 4, 4 }, // GL_COMPRESSED_xxx_ASTC_4x4_KHR |
| { 5, 4 }, // GL_COMPRESSED_xxx_ASTC_5x4_KHR |
| { 5, 5 }, // GL_COMPRESSED_xxx_ASTC_5x5_KHR |
| { 6, 5 }, // GL_COMPRESSED_xxx_ASTC_6x5_KHR |
| { 6, 6 }, // GL_COMPRESSED_xxx_ASTC_6x6_KHR |
| { 8, 5 }, // GL_COMPRESSED_xxx_ASTC_8x5_KHR |
| { 8, 6 }, // GL_COMPRESSED_xxx_ASTC_8x6_KHR |
| { 8, 8 }, // GL_COMPRESSED_xxx_ASTC_8x8_KHR |
| { 10, 5 }, // GL_COMPRESSED_xxx_ASTC_10x5_KHR |
| { 10, 6 }, // GL_COMPRESSED_xxx_ASTC_10x6_KHR |
| { 10, 8 }, // GL_COMPRESSED_xxx_ASTC_10x8_KHR |
| { 10, 10 }, // GL_COMPRESSED_xxx_ASTC_10x10_KHR |
| { 12, 10 }, // GL_COMPRESSED_xxx_ASTC_12x10_KHR |
| { 12, 12 } // GL_COMPRESSED_xxx_ASTC_12x12_KHR |
| }; |
| |
| const QSize dim(xBlockDim, yBlockDim); |
| int index = -1; |
| for (int i = 0; i < 14; i++) { |
| if (dim == dims[i]) { |
| index = i; |
| break; |
| } |
| } |
| if (index < 0) |
| return 0; |
| |
| bool useSrgb = qEnvironmentVariableIsSet("QT_ASTCHANDLER_USE_SRGB") |
| || logName().toLower().contains("srgb"); |
| |
| return useSrgb ? (glFormatSRGBBase + index) : (glFormatRGBABase + index); |
| } |
| |
| QTextureFileData QAstcHandler::read() |
| { |
| QTextureFileData nullData; |
| QTextureFileData res; |
| |
| if (!device()) |
| return nullData; |
| |
| QByteArray fileData = device()->readAll(); |
| if (fileData.size() < int(sizeof(AstcHeader)) || !canRead(QByteArray(), fileData)) { |
| qCDebug(lcQtGuiTextureIO, "Not an ASTC file: %s", logName().constData()); |
| return nullData; |
| } |
| res.setData(fileData); |
| |
| const AstcHeader *header = reinterpret_cast<const AstcHeader *>(fileData.constData()); |
| |
| int xSz = int(header->xSize[0]) | int(header->xSize[1]) << 8 | int(header->xSize[2]) << 16; |
| int ySz = int(header->ySize[0]) | int(header->ySize[1]) << 8 | int(header->ySize[2]) << 16; |
| int zSz = int(header->zSize[0]) | int(header->zSize[1]) << 8 | int(header->zSize[2]) << 16; |
| |
| quint32 glFmt = astcGLFormat(header->blockDimX, header->blockDimY); |
| |
| if (!xSz || !ySz || !zSz || !glFmt || header->blockDimZ != 1) { |
| qCDebug(lcQtGuiTextureIO, "Invalid ASTC header data in file %s", logName().constData()); |
| return nullData; |
| } |
| |
| res.setSize(QSize(xSz, ySz)); |
| res.setGLFormat(0); // 0 for compressed textures |
| res.setGLInternalFormat(glFmt); |
| //? BaseInternalFormat |
| |
| int xBlocks = (xSz + header->blockDimX - 1) / header->blockDimX; |
| int yBlocks = (ySz + header->blockDimY - 1) / header->blockDimY; |
| int zBlocks = (zSz + header->blockDimZ - 1) / header->blockDimZ; |
| |
| int byteCount = 0; |
| bool oob = mul_overflow(xBlocks, yBlocks, &byteCount) |
| || mul_overflow(byteCount, zBlocks, &byteCount) |
| || mul_overflow(byteCount, 16, &byteCount); |
| |
| |
| res.setDataOffset(sizeof(AstcHeader)); |
| res.setNumLevels(1); |
| res.setDataLength(byteCount); |
| |
| if (oob || !res.isValid()) { |
| qCDebug(lcQtGuiTextureIO, "Invalid ASTC file %s", logName().constData()); |
| return nullData; |
| } |
| |
| res.setLogName(logName()); |
| |
| #if 0 |
| qDebug() << "ASTC file handler read" << res << res.dataOffset() << res.dataLength(); |
| #endif |
| return res; |
| } |
| |
| QT_END_NAMESPACE |