1 files changed, 185 insertions, 0 deletions
diff --git a/src/imports/etcprovider/qetcprovider.cpp b/src/imports/etcprovider/qetcprovider.cpp
new file mode 100644
index 0000000000..24513edc43
--- /dev/null
+++ b/src/imports/etcprovider/qetcprovider.cpp
@@ -0,0 +1,185 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the Declarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** 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, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qetcprovider.h"
+
+#include <QtDebug>
+#include <QFile>
+
+#include <qglfunctions.h>
+
+QT_BEGIN_NAMESPACE
+
+typedef struct {
+    char aName[6];
+    unsigned short iBlank;
+    /* NB: Beware endianess 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;
+}
+
+enum {GL_ETC1_RGB8_OES=0x8d64};
+
+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;
+    }
+
+#ifdef ETC_DEBUG
+    printf("EtcTextureProvider: about to update that texture...\n");
+#endif
+
+    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
+
+    const QGLContext *ctx = QGLContext::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);
+}
+
+QSize EtcTexture::textureSize() const
+{
+    return m_size;
+}
+
+QSGTexture *QEtcProvider::requestTexture(const QString &id, QSize *size, const QSize &requestedSize)
+{
+    Q_UNUSED(requestedSize);
+    EtcTexture *ret = 0;
+
+    size->setHeight(0);
+    size->setWidth(0);
+
+    QFile file(id);
+#ifdef ETC_DEBUG
+    qDebug() << "requestTexture opening file: " << id;
+#endif
+    if (file.open(QIODevice::ReadOnly)) {
+        ret = new EtcTexture();
+        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 {
+            free (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;
+}
+
+QT_END_NAMESPACE