diff options
Diffstat (limited to 'src/quick/scenegraph/compressedtexture/qsgpkmhandler.cpp')
| -rw-r--r-- | src/quick/scenegraph/compressedtexture/qsgpkmhandler.cpp | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/src/quick/scenegraph/compressedtexture/qsgpkmhandler.cpp b/src/quick/scenegraph/compressedtexture/qsgpkmhandler.cpp new file mode 100644 index 0000000000..1b8882e9a5 --- /dev/null +++ b/src/quick/scenegraph/compressedtexture/qsgpkmhandler.cpp @@ -0,0 +1,209 @@ +/**************************************************************************** +** +** Copyright (C) 2017 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtQuick module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qsgpkmhandler_p.h" + +#include <QFile> +#include <QDebug> +#include <qendian.h> +#include <qopenglfunctions.h> +#include <qqmlfile.h> + +//#define ETC_DEBUG + +#ifndef GL_ETC1_RGB8_OES + #define GL_ETC1_RGB8_OES 0x8d64 +#endif + +#ifndef GL_COMPRESSED_RGB8_ETC2 + #define GL_COMPRESSED_RGB8_ETC2 0x9274 +#endif + +#ifndef GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2 + #define GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2 0x9276 +#endif + +#ifndef GL_COMPRESSED_RGBA8_ETC2_EAC + #define GL_COMPRESSED_RGBA8_ETC2_EAC 0x9278 +#endif + +QT_BEGIN_NAMESPACE + +static const int headerSize = 16; + +static unsigned int typeMap[5] = { + GL_ETC1_RGB8_OES, + GL_COMPRESSED_RGB8_ETC2, + 0, // unused + GL_COMPRESSED_RGBA8_ETC2_EAC, + GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2 +}; + +EtcTexture::EtcTexture() + : m_texture_id(0), m_uploaded(false) +{ + initializeOpenGLFunctions(); +} + +EtcTexture::~EtcTexture() +{ + if (m_texture_id) + glDeleteTextures(1, &m_texture_id); +} + +int EtcTexture::textureId() const +{ + if (m_texture_id == 0) { + EtcTexture *texture = const_cast<EtcTexture*>(this); + texture->glGenTextures(1, &texture->m_texture_id); + } + return m_texture_id; +} + +bool EtcTexture::hasAlphaChannel() const +{ + return m_type == GL_COMPRESSED_RGBA8_ETC2_EAC || + m_type == GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2; +} + + +void EtcTexture::bind() +{ + if (m_uploaded && m_texture_id) { + glBindTexture(GL_TEXTURE_2D, m_texture_id); + return; + } + + if (m_texture_id == 0) + glGenTextures(1, &m_texture_id); + glBindTexture(GL_TEXTURE_2D, m_texture_id); + +#ifdef ETC_DEBUG + qDebug() << "glCompressedTexImage2D, width: " << m_size.width() << "height" << m_size.height() << + "paddedWidth: " << m_paddedSize.width() << "paddedHeight: " << m_paddedSize.height(); +#endif + +#ifndef QT_NO_DEBUG + while (glGetError() != GL_NO_ERROR) { } +#endif + + QOpenGLContext *ctx = QOpenGLContext::currentContext(); + Q_ASSERT(ctx != 0); + ctx->functions()->glCompressedTexImage2D(GL_TEXTURE_2D, 0, m_type, + m_size.width(), m_size.height(), 0, + (m_paddedSize.width() * m_paddedSize.height()) / 2, + m_data.data() + headerSize); + +#ifndef QT_NO_DEBUG + // Gracefully fail in case of an error... + GLuint error = glGetError(); + if (error != GL_NO_ERROR) { + qDebug () << "glCompressedTexImage2D for compressed texture failed, error: " << error; + glBindTexture(GL_TEXTURE_2D, 0); + glDeleteTextures(1, &m_texture_id); + m_texture_id = 0; + return; + } +#endif + + m_uploaded = true; + updateBindOptions(true); +} + +class QEtcTextureFactory : public QQuickTextureFactory +{ +public: + QByteArray m_data; + QSize m_size; + QSize m_paddedSize; + unsigned int m_type; + + QSize textureSize() const { return m_size; } + int textureByteCount() const { return m_data.size(); } + + QSGTexture *createTexture(QQuickWindow *) const { + EtcTexture *texture = new EtcTexture; + texture->m_data = m_data; + texture->m_size = m_size; + texture->m_paddedSize = m_paddedSize; + texture->m_type = m_type; + return texture; + } +}; + +QQuickTextureFactory *QSGPkmHandler::read(QIODevice *device) +{ + QScopedPointer<QEtcTextureFactory> ret(new QEtcTextureFactory); + ret->m_data = device->readAll(); + if (ret->m_data.isEmpty() || ret->m_data.size() < headerSize) + return nullptr; + + const char *rawData = ret->m_data.constData(); + + // magic number + if (qstrncmp(rawData, "PKM ", 4) != 0) + return nullptr; + + // currently ignore version (rawData + 4) + + // texture type + quint16 type = qFromBigEndian<quint16>(rawData + 6); + static int typeCount = sizeof(typeMap)/sizeof(typeMap[0]); + if (type >= typeCount) + return nullptr; + ret->m_type = typeMap[type]; + + // texture size + ret->m_paddedSize.setWidth(qFromBigEndian<quint16>(rawData + 8)); + ret->m_paddedSize.setHeight(qFromBigEndian<quint16>(rawData + 10)); + if ((ret->m_paddedSize.width() * ret->m_paddedSize.height()) / 2 > ret->m_data.size() - headerSize) + return nullptr; + ret->m_size.setWidth(qFromBigEndian<quint16>(rawData + 12)); + ret->m_size.setHeight(qFromBigEndian<quint16>(rawData + 14)); + if (ret->m_size.isEmpty()) + return nullptr; + +#ifdef ETC_DEBUG + qDebug() << "requestTexture returning: " << ret->m_data.length() << "bytes; width: " << ret->m_size.width() << ", height: " << ret->m_size.height(); +#endif + + return ret.take(); +} + +QT_END_NAMESPACE |