크로스플랫폼 개발을 하고 있는데, 문제가 OS마다 다르다. 그 중 하나가 macOS에서 갑자기 왼쪽 아래쪽에만 viewport가 나타나는 현상이었다. 4.3 - Why is my output in the lower-left corner of the window? You are passing the window size, which is in screen coordinates, to glViewport, which works with pixels. On macOS with a Retina display, and possibly on other platforms in the future, screen coordinates and pixels do not map 1:1. Use the framebuffer s..