1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
// Copyright (C) 2019 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 "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];
};
QAstcHandler::~QAstcHandler() = default;
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.setNumFaces(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
|
