source: trunk/demos/boxes/main.cpp@ 640

/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation ([email protected])
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** This file is part of the demonstration applications of the Qt Toolkit.
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** accordance with the Qt Commercial License Agreement provided with the
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** GNU Lesser General Public License Usage
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** 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
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** General Public License version 3.0 as published by the Free Software
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//#include <GL/glew.h>
#include "glextensions.h"

#include "scene.h"

#include <QtGui>
#include <QGLWidget>

class GraphicsView : public QGraphicsView
{
public:
    GraphicsView()
    {
        setWindowTitle(tr("Boxes"));
        setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
        //setRenderHints(QPainter::SmoothPixmapTransform);
    }

protected:
    void resizeEvent(QResizeEvent *event) {
        if (scene())
            scene()->setSceneRect(QRect(QPoint(0, 0), event->size()));
        QGraphicsView::resizeEvent(event);
    }
};

inline bool matchString(const char *extensionString, const char *subString)
{
    int subStringLength = strlen(subString);
    return (strncmp(extensionString, subString, subStringLength) == 0)
        && ((extensionString[subStringLength] == ' ') || (extensionString[subStringLength] == '\0'));
}

bool necessaryExtensionsSupported()
{
    const char *extensionString = reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS));
    const char *p = extensionString;

    const int GL_EXT_FBO = 1;
    const int GL_ARB_VS = 2;
    const int GL_ARB_FS = 4;
    const int GL_ARB_SO = 8;
    int extensions = 0;

    while (*p) {
        if (matchString(p, "GL_EXT_framebuffer_object"))
            extensions |= GL_EXT_FBO;
        else if (matchString(p, "GL_ARB_vertex_shader"))
            extensions |= GL_ARB_VS;
        else if (matchString(p, "GL_ARB_fragment_shader"))
            extensions |= GL_ARB_FS;
        else if (matchString(p, "GL_ARB_shader_objects"))
            extensions |= GL_ARB_SO;
        while ((*p != ' ') && (*p != '\0'))
            ++p;
        if (*p == ' ')
            ++p;
    }
    return (extensions == 15);