direct3d9 vs opengl

#ifdef USED3D
    IDirect3DDevice9_SetTexture( GD3DDev, 0, T ? T->obj : NULL );
    IDirect3DDevice9_SetVertexDeclaration( GD3DDev, F->vdecl );
    IDirect3DDevice9_DrawPrimitiveUP( GD3DDev, type,
        getprimitivecount( type, count / F->size ),
        data, F->size );
    IDirect3DDevice9_SetVertexDeclaration( GD3DDev, NULL );

#else
    if( F->P[0] ) glVertexPointer( F->P[3], F->P[2], F->size, data + F->P[1] );
    if( F->T[0] ) glTexCoordPointer( F->T[3], F->T[2], F->size, data + F->T[1] );
    if( F->C[0] ) glColorPointer( F->C[3], F->C[2], F->size, data + F->C[1] );
    if( F->N[0] ) glNormalPointer( F->N[2], F->size, data + F->N[1] );

    if( T )
    {
        glBindTexture( GL_TEXTURE_2D, T->id );
        glEnable( GL_TEXTURE_2D );
    }
    else
        glDisable( GL_TEXTURE_2D );

    if( F->P[0] ) glEnableClientState( GL_VERTEX_ARRAY );
    if( F->T[0] ) glEnableClientState( GL_TEXTURE_COORD_ARRAY );
    if( F->C[0] ) glEnableClientState( GL_COLOR_ARRAY );
    if( F->N[0] ) glEnableClientState( GL_NORMAL_ARRAY );

    glColor4f( 1, 1, 1, 1 );
    if( idcs )
        glDrawElements( type, count, GL_UNSIGNED_SHORT, idcs + start * 2 );
    else
        glDrawArrays( type, start, count );

    if( F->P[0] ) glDisableClientState( GL_VERTEX_ARRAY );
    if( F->T[0] ) glDisableClientState( GL_TEXTURE_COORD_ARRAY );
    if( F->C[0] ) glDisableClientState( GL_COLOR_ARRAY );
    if( F->N[0] ) glDisableClientState( GL_NORMAL_ARRAY );

#endif