53599592e0
Comes with backends for Vulkan, Metal, Direct3D 11.1, and OpenGL (ES). All APIs are private for now. Shader conditioning (i.e. generating a QRhiShader in memory or on disk from some shader source code) is done via the tools and APIs provided by qt-labs/qtshadertools. The OpenGL support follows the cross-platform tradition of requiring ES 2.0 only, while optionally using some (ES) 3.x features. It can operate in core profile contexts as well. Task-number: QTBUG-70287 Change-Id: I246f2e36d562e404012c05db2aa72487108aa7cc Reviewed-by: Lars Knoll <lars.knoll@qt.io>
138 lines
4.8 KiB
C
138 lines
4.8 KiB
C
/****************************************************************************
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**
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** Copyright (C) 2018 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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** as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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static const quint32 DDS_MAGIC = 0x20534444; // 'DDS '
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static const quint32 DDS_FOURCC = 4;
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#define FOURCC(c0, c1, c2, c3) ((c0) | ((c1) << 8) | ((c2) << 16) | ((c3 << 24)))
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struct DDS_PIXELFORMAT {
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quint32 size;
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quint32 flags;
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quint32 fourCC;
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quint32 rgbBitCount;
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quint32 rBitMask;
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quint32 gBitMask;
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quint32 bBitMask;
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quint32 aBitMask;
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};
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struct DDS_HEADER {
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quint32 size;
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quint32 flags;
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quint32 height;
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quint32 width;
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quint32 pitch;
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quint32 depth;
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quint32 mipMapCount;
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quint32 reserved1[11];
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DDS_PIXELFORMAT pixelFormat;
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quint32 caps;
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quint32 caps2;
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quint32 caps3;
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quint32 caps4;
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quint32 reserved2;
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};
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static quint32 bc1size(const QSize &size)
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{
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static const quint32 blockSize = 8; // 8 bytes for BC1
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const quint32 bytesPerLine = qMax<quint32>(1, (size.width() + 3) / 4) * blockSize;
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const quint32 ySize = qMax<quint32>(1, (size.height() + 3) / 4);
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return bytesPerLine * ySize;
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}
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static QByteArrayList loadBC1(const QString &filename, QSize *size)
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{
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QFile f(filename);
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if (!f.open(QIODevice::ReadOnly)) {
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qWarning("Failed to open %s", qPrintable(filename));
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return QByteArrayList();
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}
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quint32 magic = 0;
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f.read(reinterpret_cast<char *>(&magic), sizeof(magic));
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if (magic != DDS_MAGIC) {
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qWarning("%s is not a DDS file", qPrintable(filename));
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return QByteArrayList();
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}
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DDS_HEADER header;
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f.read(reinterpret_cast<char *>(&header), sizeof(header));
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if (header.size != sizeof(DDS_HEADER)) {
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qWarning("Invalid DDS header size");
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return QByteArrayList();
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}
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if (header.pixelFormat.size != sizeof(DDS_PIXELFORMAT)) {
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qWarning("Invalid DDS pixel format size");
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return QByteArrayList();
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}
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if (!(header.pixelFormat.flags & DDS_FOURCC)) {
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qWarning("Invalid DDS pixel format");
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return QByteArrayList();
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}
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if (header.pixelFormat.fourCC != FOURCC('D', 'X', 'T', '1')) {
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qWarning("Only DXT1 (BC1) is supported");
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return QByteArrayList();
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}
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QByteArrayList data;
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QSize sz(header.width, header.height);
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for (quint32 level = 0; level < header.mipMapCount; ++level) {
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data.append(f.read(bc1size(sz)));
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sz.setWidth(qMax(1, sz.width() / 2));
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sz.setHeight(qMax(1, sz.height() / 2));
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}
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if (size)
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*size = QSize(header.width, header.height);
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return data;
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}
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