glc_ext.cpp

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/****************************************************************************

 This file is part of the GLC-lib library.
 Copyright (C) 2005-2008 Laurent Ribon (laumaya@users.sourceforge.net)
 http://glc-lib.sourceforge.net

 GLC-lib is free software; you can redistribute it and/or modify
 it under the terms of the GNU Lesser General Public License as published by
 the Free Software Foundation; either version 3 of the License, or
 (at your option) any later version.

 GLC-lib is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public License
 along with GLC-lib; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

*****************************************************************************/

#include "glc_ext.h"
#include <QString>
#include <QGLContext>
#include <QDebug>
#include <QGLShaderProgram>

#if !defined(Q_OS_MAC)
// ARB_vertex_buffer_object
PFNGLBINDBUFFERARBPROC                          glBindBuffer                    = NULL;
PFNGLDELETEBUFFERSARBPROC                       glDeleteBuffers                 = NULL;
PFNGLGENBUFFERSARBPROC                          glGenBuffers                    = NULL;
PFNGLISBUFFERARBPROC                            glIsBuffer                              = NULL;
PFNGLBUFFERDATAARBPROC                          glBufferData                    = NULL;
PFNGLBUFFERSUBDATAARBPROC                       glBufferSubData                 = NULL;
PFNGLGETBUFFERSUBDATAARBPROC            glGetBufferSubData              = NULL;
PFNGLMAPBUFFERARBPROC                           glMapBuffer                             = NULL;
PFNGLUNMAPBUFFERARBPROC                         glUnmapBuffer                   = NULL;
PFNGLGETBUFFERPARAMETERIVARBPROC        glGetBufferParameteriv  = NULL;
PFNGLGETBUFFERPOINTERVARBPROC           glGetBufferPointerv             = NULL;
// glDrawRangElement
//PFNGLDRAWRANGEELEMENTSPROC                    glDrawRangeElements             = NULL;

// glMultiDrawElement
PFNGLMULTIDRAWELEMENTSPROC                      glMultiDrawElements             = NULL;

// GL_point_parameters Point Sprite
PFNGLPOINTPARAMETERFARBPROC                     glPointParameterf               = NULL;
PFNGLPOINTPARAMETERFVARBPROC            glPointParameterfv              = NULL;

#endif

//const QString glExtension(reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS)));

// Return true if the extension is supported
bool glc::extensionIsSupported(const QString& extension)
{
        QString glExtension(reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS)));
        return glExtension.contains(extension);
}

// Return true if VBO extension is succesfully loaded
bool glc::loadVboExtension()
{
        bool result= true;
#if !defined(Q_OS_MAC)
        const QGLContext* pContext= QGLContext::currentContext();
    glBindBuffer                                = (PFNGLBINDBUFFERARBPROC)pContext->getProcAddress(QLatin1String("glBindBuffer"));
    glDeleteBuffers                             = (PFNGLDELETEBUFFERSARBPROC)pContext->getProcAddress(QLatin1String("glDeleteBuffers"));
    glGenBuffers                                = (PFNGLGENBUFFERSARBPROC)pContext->getProcAddress(QLatin1String("glGenBuffers"));
    glIsBuffer                                  = (PFNGLISBUFFERARBPROC)pContext->getProcAddress(QLatin1String("glIsBuffer"));
    glBufferData                                = (PFNGLBUFFERDATAARBPROC)pContext->getProcAddress(QLatin1String("glBufferData"));
    glBufferSubData                             = (PFNGLBUFFERSUBDATAARBPROC)pContext->getProcAddress(QLatin1String("glBufferSubData"));
    glGetBufferSubData                  = (PFNGLGETBUFFERSUBDATAARBPROC)pContext->getProcAddress(QLatin1String("glGetBufferSubData"));
    glMapBuffer                                 = (PFNGLMAPBUFFERARBPROC)pContext->getProcAddress(QLatin1String("glMapBuffer"));
    glUnmapBuffer                               = (PFNGLUNMAPBUFFERARBPROC)pContext->getProcAddress(QLatin1String("glUnmapBuffer"));
    glGetBufferParameteriv              = (PFNGLGETBUFFERPARAMETERIVARBPROC)pContext->getProcAddress(QLatin1String("glGetBufferParameteriv"));
    glGetBufferPointerv                 = (PFNGLGETBUFFERPOINTERVARBPROC)pContext->getProcAddress(QLatin1String("glGetBufferPointerv"));
    //glDrawRangeElements                       = (PFNGLDRAWRANGEELEMENTSPROC)pContext->getProcAddress(QLatin1String("glDrawRangeElements"));
    glMultiDrawElements                 = (PFNGLMULTIDRAWELEMENTSPROC)pContext->getProcAddress(QLatin1String("glMultiDrawElements"));

    result= glBindBuffer && glDeleteBuffers && glGenBuffers && glIsBuffer && glBufferData && glBufferSubData &&
    glGetBufferSubData && glMapBuffer && glUnmapBuffer && glGetBufferParameteriv && glGetBufferPointerv && glMultiDrawElements;// and glDrawRangeElements;
#endif
    return result;

}

// Load GLSL extensions
bool glc::loadGlSlExtension()
{
    return QGLShaderProgram::hasOpenGLShaderPrograms();
}

// Load Point Sprite extension
bool glc::loadPointSpriteExtension()
{
        bool result= true;
#if !defined(Q_OS_MAC)
        const QGLContext* pContext= QGLContext::currentContext();
        glPointParameterf                               = (PFNGLPOINTPARAMETERFARBPROC)pContext->getProcAddress(QLatin1String("glPointParameterf"));
        if (!glPointParameterf) qDebug() << "not glPointParameterf";
        glPointParameterfv                              = (PFNGLPOINTPARAMETERFVARBPROC)pContext->getProcAddress(QLatin1String("glPointParameterfv"));
        if (!glPointParameterfv) qDebug() << "not glPointParameterfv";

        result= glPointParameterf && glPointParameterfv;

#endif
    return result;
}