// Called by Rocket when it wants to render geometry that it does not wish to optimise.
void ShellRenderInterfaceOpenGL::RenderGeometry(Rocket::Core::Vertex* vertices, int ROCKET_UNUSED(num_vertices), int* indices, int num_indices, const Rocket::Core::TextureHandle texture, const Rocket::Core::Vector2f& translation)
{
    glPushClientAttrib(GL_CLIENT_ALL_ATTRIB_BITS);
    glPushAttrib(GL_ALL_ATTRIB_BITS);

    glPushMatrix();
    glTranslatef(translation.x, translation.y, 0);

    glVertexPointer(2, GL_FLOAT, sizeof(Rocket::Core::Vertex), &vertices[0].position);
    glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(Rocket::Core::Vertex), &vertices[0].colour);

    if (!texture)
    {
        glDisable(GL_TEXTURE_2D);
        glDisableClientState(GL_TEXTURE_COORD_ARRAY);
    }
    else
    {
        glEnable(GL_TEXTURE_2D);
        glBindTexture(GL_TEXTURE_2D, (GLuint) texture);
        glEnableClientState(GL_TEXTURE_COORD_ARRAY);
        glTexCoordPointer(2, GL_FLOAT, sizeof(Rocket::Core::Vertex), &vertices[0].tex_coord);
    }

        glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, 0);
    glDrawElements(GL_TRIANGLES, num_indices, GL_UNSIGNED_INT, indices);

    glPopMatrix();
    glPopAttrib ();
    glPopClientAttrib ();
}