void __fastcall CGraphicCore::_SurfaceDrawTextureLine
                                           //Pointer to primitive
                                           (const Primitive_In * ptr_prim
                                           //Some additional info
                                           ,CDrawRule * rule)
{
    _ASSERTE(ptr_prim->PointsCount()>1);
    size_t first_point_index = ptr_prim->GetFirstPointIndex();
    size_t points_number     = ptr_prim->PointsCount();
    //rule->first_point_ptr - it is a pointer to the first point in vertex array
    const fvec2_s * cur_pnt_ptr    = rule->first_point_ptr + first_point_index;
    const fvec2_s * border_pnt_ptr = cur_pnt_ptr + points_number;

    double * tex_mem;
    //this is function for getting memory from buffer (actually template function)
    //it calls realloc(buffer_data_,sizeof(double)*elements_number)
    rule->additional_buffer_prt->GetRawMemory(points_number,&tex_mem);
    double * ptr_tex_storage = tex_mem;

    double tex_crd = 0;
    fvec2_s prev_pnt;
    fvec2_s cur_pnt;
    prev_pnt = *cur_pnt_ptr;
    cur_pnt  = *cur_pnt_ptr;    
    while (cur_pnt_ptr!=border_pnt_ptr)
    {
        cur_pnt = *cur_pnt_ptr;
        tex_crd = //do some calculations
        *ptr_tex_storage = tex_crd;
        ++ptr_tex_storage;
        ++cur_pnt_ptr;
        prev_pnt = cur_pnt;
    }
    //HACK: possible solution: modify Vertexpointer and in Deinit function reset it to first element.
    glTexCoordPointer(1,GL_DOUBLE,0,tex_mem - first_point_index);
    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
    //render primitive
    glDrawArrays(GL_LINE_STRIP,first_point_index,points_number);
    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
    
    NDebugTool::DetectGLError();
    return;
}

...struct fvect2d{   float x;   float y;};....void DrawSomething (){   fvect2d vertex_data[3];   vertex_data[0].x = 0;   vertex_data[0].y = 0;   vertex_data[1].x = 1.f;   vertex_data[1].y = 1.f;   vertex_data[2].x = 1.f;   vertex_data[2].y = 0;   glVertexPointer(2,GL_FLOAT,0,&vertex_data[0].x);   glEnableClientState(GL_VERTEX_ARRAY);   glDrawArrays(GL_TRIANGLES,0,3);   //I modify vertex_data during enabled vertex array   vertex_data[1].x = -1.f;   vertex_data[1].y = -1.f;   glDrawArrays(GL_TRIANGLES,0,3);   glDisableClientState(GL_VERTEX_ARRAY);}