I've created a game window of size 1280x720, and everything works great, until I want to change it to fullscreen mode. When I try to use SDL_SetWindowFullscreen(_window, SDL_WINDOW_FULLSCREEN), I get weird behavior where the window is rendered  near the middle of the screen and gets cut off. It ends up looking something like this:

At first I thought it was a rendering bug, but I noticed that I can only move the mouse cursor within the game window area on my screen, so it's almost like the window itself is positioned oddly. One other thing I should note, when I set my game window to 800x600, it works just fine - it scales to fit and fills up the entire screen.

I have also tried SDL_WINDOW_FULLSCREEN_DESKTOP, but this also doesn't give me the desired behavior. This time it renders the screen in the bottom left corner, like this:

I can move the mouse cursor anywhere on screen, so this one may be a rendering issue. I noticed that if I call glViewport with different values I experimented with, it would change the position and size of

It's on Windows 7, and yeah I just updated to SDL2.0.8 to see if that would fix it, but it didn't.

1 hour ago, Rutin said:

Can you please post the exact code you're using to setup your window and render out display.

I don't use SDL anymore since SDL1, but I made a quick project with your res of 1280x720, and toggled full-screen after window creation and it doesn't do anything strange.

// CREATE WINDOW + FULLSCREEN
window = SDL_CreateWindow("Empty", 0, 0, 1280, 720, SDL_WINDOW_FULLSCREEN);

or

// CREATE WINDOW
window = SDL_CreateWindow("Empty", 0, 0, 1280, 720, SDL_WINDOW_SHOWN);

// FULLSCREEN
SDL_SetWindowFullscreen(window, SDL_WINDOW_FULLSCREEN);

 

It's mostly the same, except I'm centering it and  setting the SDL_WINDOW_OPENGL flag:
 

    //Create the window via SDL
    _window = SDL_CreateWindow("Engine",
                               SDL_WINDOWPOS_CENTERED,
                               SDL_WINDOWPOS_CENTERED,
                               _screenWidth,
                               _screenHeight,
                               SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL);

And then I set the window to fullscreen after, exactly as you've done in the second code snippet.

10 hours ago, Rutin said:

I made the window with openGL using the same code above, no problem.

Can you make a minimal project that replicates the problem, then post your code here so we can compile it.

Here's the a basic window creation app I wrote that will toggle between fullscreen and windowed mode when it detects a key press. Even with this minimal code, the problem still arises.

#include <SDL.h>

int main(int argc, char *args[]) {
  
	SDL_Window* window;

	window = SDL_CreateWindow("Test",
                                  SDL_WINDOWPOS_CENTERED,
                                  SDL_WINDOWPOS_CENTERED,
                                  1280,
                                  720,
                                  SDL_WINDOW_SHOWN);
	
	SDL_Event event;

	//While the user hasn't quit, run the main loop.
	bool quit = false;
	bool isFullscreen = false;

	while (quit == false) {
		while (SDL_PollEvent(&event)) {
			switch (event.type) {

			case SDL_KEYDOWN:

				if (isFullscreen == false) {
					SDL_SetWindowFullscreen(window, SDL_WINDOW_FULLSCREEN);
				}
				else {
					SDL_SetWindowFullscreen(window, 0);
				}

				isFullscreen = !isFullscreen;

				break;

			case SDL_QUIT:
				quit = true;
				break;
			}
		}
	}
  
	return 0;
}

24 minutes ago, Rutin said:

Oh! That's an easy fix.

The problem you're having is this: 

You need to have 

SDL_Surface* screenSurface;

Then set it before the update:

screenSurface = SDL_GetWindowSurface(window);
SDL_UpdateWindowSurface(window);

Here is your code edited, sorry if I didn't put it in the right place as I don't use SDL2 and it's been a long time since I touched SDL.

#include <SDL.h>

int main(int argc, char *args[]) {

	SDL_Window* window;
	SDL_Surface* screenSurface;

	window = SDL_CreateWindow("Test",
		SDL_WINDOWPOS_CENTERED,
		SDL_WINDOWPOS_CENTERED,
		1280,
		720,
		SDL_WINDOW_SHOWN);


	SDL_Event event;

	//While the user hasn't quit, run the main loop.
	bool quit = false;
	bool isFullscreen = false;

	while (quit == false) {
		while (SDL_PollEvent(&event)) {
			switch (event.type) {

			case SDL_KEYDOWN:

				if (isFullscreen == false) {
					SDL_SetWindowFullscreen(window, SDL_WINDOW_FULLSCREEN);
				}
				else {
					SDL_SetWindowFullscreen(window, 0);
				}

				isFullscreen = !isFullscreen;

				break;

			case SDL_QUIT:
				quit = true;
				break;
			}
		}

		screenSurface = SDL_GetWindowSurface(window);

		SDL_UpdateWindowSurface(window);
	}

	SDL_DestroyWindow(window);
	SDL_Quit();

	return 0;
}

 

Let me know if this fixes your problem.

Unfortunately it does not fix the problem. The mouse cursor is still constrained to a particular region of the screen, like the window itself is positioned incorrectly.