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Say my window is 1280x720. I want to render my stuff to lower resolution and then stretch it to window. I've tried this:
glViewport(0, 0, 1280 / 2, 720 / 2);
When I call glViewport and pass lesser width and height than window, I get all my OpenGL rendering in left bottom 1/4 of window. I need to scale it (linear filtering preferably) back to window size so I would get a pixelated effect.
I wonder if there is such possibility within glad/glfw API.
One way to achieve what you want is to render into a texture-backed FBO that is half the width and height of the window, then draw that texture into the window at the full size.
You say:
I need to scale it (linear filtering preferably) back to window size so I would get a pixelated effect.
This is a contradictory statement. If you want pixelation, you probably want nearest neighbor filtering. Linear filtering will cause it to be smoothed out.
