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Diffstat (limited to 'examples/quick/textureprovider/etcprovider.cpp')
| -rw-r--r-- | examples/quick/textureprovider/etcprovider.cpp | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/examples/quick/textureprovider/etcprovider.cpp b/examples/quick/textureprovider/etcprovider.cpp new file mode 100644 index 0000000000..0bb072ffaf --- /dev/null +++ b/examples/quick/textureprovider/etcprovider.cpp @@ -0,0 +1,193 @@ +/**************************************************************************** +** +** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the demonstration applications 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 Digia. For licensing terms and +** conditions see http://qt.digia.com/licensing. For further information +** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Digia gives you certain additional +** rights. These rights are described in the Digia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "etcprovider.h" + +#include <QFile> +#include <QDebug> +#include <qopenglfunctions.h> + +//#define ETC_DEBUG + +#ifndef GL_ETC1_RGB8_OES + #define GL_ETC1_RGB8_OES 0x8d64 +#endif + +typedef struct { + char aName[6]; + unsigned short iBlank; + /* NB: Beware endianness issues here. */ + unsigned char iPaddedWidthMSB; + unsigned char iPaddedWidthLSB; + unsigned char iPaddedHeightMSB; + unsigned char iPaddedHeightLSB; + unsigned char iWidthMSB; + unsigned char iWidthLSB; + unsigned char iHeightMSB; + unsigned char iHeightLSB; +} ETCHeader; + +unsigned short getWidth(ETCHeader *pHeader) +{ + return (pHeader->iWidthMSB << 8) | pHeader->iWidthLSB; +} + +unsigned short getHeight(ETCHeader *pHeader) +{ + return (pHeader->iHeightMSB << 8) | pHeader->iHeightLSB; +} + +unsigned short getPaddedWidth(ETCHeader *pHeader) +{ + return (pHeader->iPaddedWidthMSB << 8) | pHeader->iPaddedWidthLSB; +} + +unsigned short getPaddedHeight(ETCHeader *pHeader) +{ + return (pHeader->iPaddedHeightMSB << 8) | pHeader->iPaddedHeightLSB; +} + +EtcTexture::EtcTexture() + : m_texture_id(0) +{ + +} + +EtcTexture::~EtcTexture() +{ + if (m_texture_id) + glDeleteTextures(1, &m_texture_id); +} + +void EtcTexture::bind() +{ + if (m_texture_id) { + glBindTexture(GL_TEXTURE_2D, m_texture_id); + return; + } + + 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 + + QOpenGLContext *ctx = QOpenGLContext::currentContext(); + Q_ASSERT(ctx != 0); + ctx->functions()->glCompressedTexImage2D(GL_TEXTURE_2D, 0, GL_ETC1_RGB8_OES, + m_size.width(), m_size.height(), 0, + (m_paddedSize.width() * m_paddedSize.height()) >> 1, + m_data.data() + 16); + + // 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; + } + + updateBindOptions(true); +} + +class QEtcTextureFactory : public QQuickTextureFactory +{ +public: + QByteArray m_data; + QSize m_size; + QSize m_paddedSize; + + 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; + return texture; + } +}; + +QQuickTextureFactory *EtcProvider::requestTexture(const QString &id, QSize *size, const QSize &requestedSize) +{ + Q_UNUSED(requestedSize); + QEtcTextureFactory *ret = 0; + + size->setHeight(0); + size->setWidth(0); + + // resolve paths relative to qrc file + QFile file(QLatin1String(":/textureprovider/") + id); +#ifdef ETC_DEBUG + qDebug() << "requestTexture opening file: " << id; +#endif + if (file.open(QIODevice::ReadOnly)) { + ret = new QEtcTextureFactory; + ret->m_data = file.readAll(); + if (!ret->m_data.isEmpty()) { + ETCHeader *pETCHeader = NULL; + pETCHeader = (ETCHeader *)ret->m_data.data(); + size->setHeight(getHeight(pETCHeader)); + size->setWidth(getWidth(pETCHeader)); + ret->m_size = *size; + ret->m_paddedSize.setHeight(getPaddedHeight(pETCHeader)); + ret->m_paddedSize.setWidth(getPaddedWidth(pETCHeader)); + } + else { + delete ret; + ret = 0; + } + } + +#ifdef ETC_DEBUG + if (ret) + qDebug() << "requestTexture returning: " << ret->m_data.length() << ", bytes; width: " << size->width() << ", height: " << size->height(); + else + qDebug () << "File not found."; +#endif + + return ret; +} |