How to properly scale 2d objects in opengl?

Question

C++ / C#

Let's say I want to draw a square on the screen. If you use the standard orthographic projection, then with an aspect ratio of 1:1, the square will be a square, but when the window is stretched, it will be a rectangle. How to avoid it? Should I use a projection that can be measured in pixels to take a percentage of a side?

Answer 1

In my opinion, it's not about 2d, but just about the viewport. Most likely you need to "dig" in the direction of glOrtho . Example .