static void quadTexCoords(Vector2f *tc, WallEdge const &leftEdge, WallEdge const &rightEdge, Vector2f const &texOrigin, Vector2f const &texDimensions, bool horizontal) { DENG2_ASSERT(tc); if(horizontal) { tc[0] = (texOrigin / texDimensions).yx(); tc[2] = tc[0] + Vector2f(0 , wallWidth(leftEdge, rightEdge)) / texDimensions.yx(); tc[3] = tc[0] + Vector2f(wallHeight(leftEdge, rightEdge), wallWidth(leftEdge, rightEdge)) / texDimensions.yx(); tc[1] = Vector2f(tc[3].x, tc[0].y); } else // Vertical. { tc[1] = texOrigin / texDimensions; tc[0] = tc[1] + Vector2f(0 , wallHeight(leftEdge, rightEdge)) / texDimensions; tc[2] = tc[1] + Vector2f(wallWidth(leftEdge, rightEdge), wallHeight(leftEdge, rightEdge)) / texDimensions; tc[3] = Vector2f(tc[2].x, tc[1].y); } }