src/cardinfo.cpp

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#include "cardinfo.h"

// This function returns true if the extension is there.
bool CARDINFO::isExtensionSupported(string extstring)
{
        char * temp = (char *) glGetString(GL_EXTENSIONS);
        if (temp == 0)
        {
                cout << "Error getting extensions.  Continuing anyway, errors may follow!" << endl;
                return true;
        }

        string s = temp;
        string::size_type temppos = s.find(extstring);

        bool hasext = (temppos <= s.length());

        if (!hasext)
        {
                cout << "Extension not supported: " << extstring << endl;
        }

        //cout << s << endl;

        return hasext;
}

void CARDINFO::ResetDB()
{
        db.resize(NUM_CARDINFOTYPES);
        dbvalid = false;
}

int CARDINFO::GetCapability(CARDINFOTYPE::TYPE capability)
{
        if (!dbvalid)
                return -1;
        
        if (capability >= 0 && capability < NUM_CARDINFOTYPES)
        {
                return db[capability].data;
        }
        
        return -1;
}

void CARDINFO::BuildCardInfo()
{
        if (isExtensionSupported( "GL_ARB_multitexture" ))
        {
                db[CARDINFOTYPE::MULTITEXTURE].data = 1;
                GLint tu;
                glGetIntegerv( GL_MAX_TEXTURE_UNITS_ARB,&tu );
                db[CARDINFOTYPE::TEXTUREUNITS].data = tu;
        }
        else
        {
                db[CARDINFOTYPE::MULTITEXTURE].data = 0;
                db[CARDINFOTYPE::TEXTUREUNITS].data = 1;
        }
        
        if (isExtensionSupported( "GL_EXT_texture_filter_anisotropic" ))
        {
                db[CARDINFOTYPE::ANISOTROPY].data = 1;
                GLint aniso;
                glGetIntegerv( GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT,&aniso );
                db[CARDINFOTYPE::MAXANISOTROPY].data = aniso;
        }
        else
        {
                db[CARDINFOTYPE::ANISOTROPY].data = 0;
                db[CARDINFOTYPE::MAXANISOTROPY].data = -1;
        }
        
        dbvalid = true;
}

void CARDINFO::PrintCardInfo(ostream & out)
{
        if (dbvalid)
        {
                out << "Multitexture: ";
                if (db[CARDINFOTYPE::MULTITEXTURE].data == 1)
                        out << "Yes" << endl;
                else
                        out << "No" << endl;
                out << "Texture units: " << db[CARDINFOTYPE::TEXTUREUNITS].data << endl;
                out << "Anisotropic texture filtering: ";
                if (db[CARDINFOTYPE::ANISOTROPY].data == 1)
                {
                        out << "Yes" << endl;
                        out << "Maximum Anisotropy: " << db[CARDINFOTYPE::MAXANISOTROPY].data << endl;
                }
                else
                        out << "No" << endl;
        }
        else
                cout << "Card info not yet built" << endl;
}

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