Gamma changes when fullscreen (SDL2, OpenGL)

Adam Bodorkos · 2019-07-11T17:48:01

Hi gamedevs! I've been googling my issue for days now, nothing comes up that would solve it. People have similar problems, but this one seems unique to me?! To get to the point, here's what I have: custom C++ engine, doing the baby steps, for now. I can render 2D sprites with transparency properly OpenGL (4.4 core) with SDL2, glew 2 SRGB Frambuffers, I render to the 1st, then post-effects to the 2nd, then blit it to the default FBO Windows 10 desktop PC, 4k screen (well, two of them, different types) GeForce GTX 1050 Ti, latest drivers SDL_GL_SetAttribute(SDL_GL_FRAMEBUFFER_SRGB_CAPABLE, 1); glEnable(GL_FRAMEBUFFER_SRGB); So, the problem: In windowed mode, the gamma is fine. Whenever I go "full screen" (not even exclusive mode, just borderless, i.e. SDL_WINDOW_FULLSCREEN_DESKTOP), the screen suddenly becomes too dark. Here's the fun part: if I then press the volume up/down multimedia key, then while the Win10 overlay is showing, the gamma becomes correct!! But the moment when the volume overlay is gone, boom, darker screen again. While it's "switching", I can see pink-ish, green-ish artifacts for about 1/10 of a second. Switching back to windowed, it's fine again. Screenshots done while fullscreen look fine. Now, I have no idea what causes this - is it SDL, OpenGL, Windows, GPU drivers, or my monitor (both of them do this)? I'm hoping someone can help figure this out. I'll be eternally grateful, since this is making me pull my hair out. Disclaimer: I'm not that experienced in this area (graphics programming, GPUs), my greatest achievement was a deferred renderer playground (it used WinApi - not SDL). Help me please!! Adam B EDIT: Forgot to mention that I've checked many settings already. In NVIDIA Control Panel, I don't have anything suspicious, under "Adjust desktop color settings", it's "Use NVIDIA settings". Nothing that would indicate any kind of overrides. Windows 10's Game Mode ON/OFF doesn't make a difference. Game bar is OFF.

Graphics and GPU Programming Programming OpenGL

Started by bodigy July 02, 2019 06:45 PM

10 comments, last by bodigy 5 years, 6 months ago

bodigy

Author

124

July 11, 2019 05:48 PM

Great news!! I replaced SDL completely with glfw, and now this problem is gone! My borderless fullscreen window mode, and normal window mode, all work perfectly now. I honestly don't even want to know why it happened anymore. I'm just glad it's over!

Glfw seems much more lightweight and better suited for my needs. Thank you all for the suggestions!

Gamma changes when fullscreen (SDL2, OpenGL)

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Gamma changes when fullscreen (SDL2, OpenGL)

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