How can I determine the optimal resolution for a fullscreen OpenGL window in Winapi (C/C )?

Detecting the Current Screen Resolution in Winapi (C/C )

In today's world of LCD screens, determining the optimal resolution for a newly created OpenGL fullscreen window is crucial for delivering a seamless user experience. Winapi provides several methods for retrieving screen resolution information, catering to different use cases.

Primary Monitor Resolution

To obtain the size of the primary monitor, you can use the following Winapi functions:

• GetSystemMetrics(SM_CXSCREEN) for the horizontal dimension
• GetSystemMetrics(SM_CYSCREEN) for the vertical dimension

Alternatively, GetDeviceCaps can also be used for this purpose.

Combined Monitor Resolution

To determine the combined size of all monitors in the system, use:

• GetSystemMetrics(SM_CXVIRTUALSCREEN) for the horizontal dimension
• GetSystemMetrics(SM_CYVIRTUALSCREEN) for the vertical dimension

Work Area Resolution

For the size of the work area (excluding the taskbar and docked bars) on the primary monitor, employ:

• SystemParametersInfo(SPI_GETWORKAREA)

Specific Monitor Resolution

To retrieve the size of a specific monitor (including both the work area and screen):

• GetMonitorInfo

Note: It's crucial to remember that monitor coordinates do not always start at 0x0. Therefore, solely knowing the size is insufficient for accurately positioning a window. Utilize MonitorFromWindow to identify the monitor on which your window resides and subsequently call GetMonitorInfo.

Low-Level Control

To access lower-level resolution management or to change the screen settings, consider the following functions:

• EnumDisplayDevices: Enumerate display devices
• EnumDisplaySettings: Enumerate supported display settings
• ChangeDisplaySettings: Modify display settings

This approach is especially useful for retrieving the screen's refresh rate (not directly provided by GetDeviceCaps) or adjusting resolution.

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