Function UpdateFullscreenResolutions

src/openrct2-ui/UiContext.cpp:878–926

    }

    void UpdateFullscreenResolutions()
    {
        // Query number of display modes
        int32_t displayIndex = SDL_GetWindowDisplayIndex(_window);
        int32_t numDisplayModes = SDL_GetNumDisplayModes(displayIndex);

        // Get desktop aspect ratio
        SDL_DisplayMode mode;
        SDL_GetDesktopDisplayMode(displayIndex, &mode);

        // Get resolutions
        auto resolutions = std::vector<Resolution>();
        float desktopAspectRatio = static_cast<float>(mode.w) / mode.h;
        for (int32_t i = 0; i < numDisplayModes; i++)
        {
            SDL_GetDisplayMode(displayIndex, i, &mode);
            if (mode.w > 0 && mode.h > 0)
            {
                float aspectRatio = static_cast<float>(mode.w) / mode.h;
                if (std::fabs(desktopAspectRatio - aspectRatio) < 0.1f)
                {
                    resolutions.push_back({ mode.w, mode.h });
                }
            }
        }

        // Sort by area
        std::sort(resolutions.begin(), resolutions.end(), [](const Resolution& a, const Resolution& b) -> bool {
            int32_t areaA = a.Width * a.Height;
            int32_t areaB = b.Width * b.Height;
            return areaA < areaB;
        });

        // Remove duplicates
        auto last = std::unique(resolutions.begin(), resolutions.end(), [](const Resolution& a, const Resolution& b) -> bool {
            return (a.Width == b.Width && a.Height == b.Height);
        });
        resolutions.erase(last, resolutions.end());

        // Update config fullscreen resolution if not set
        if (!resolutions.empty()
            && (Config::Get().general.fullscreenWidth == -1 || Config::Get().general.fullscreenHeight == -1))
        {
            Config::Get().general.fullscreenWidth = resolutions.back().Width;
            Config::Get().general.fullscreenHeight = resolutions.back().Height;
        }

        _fsResolutions = resolutions;
    }

    Resolution GetClosestResolution(int32_t inWidth, int32_t inHeight)
    {