High DPI support

[ccqil]

My screen is 3840 x 2160 and everything so small that it's unreadable/unusable.

This is a problem with imgui. And you can check feature/hidpi-support to fix it.

[JX-Master]

On Windows 10 1607 and above, the Win32 API GetDpiForWindow will fetch the DPI value for the specified window. The value is 96 by default, and the scaled UI size can be computed by:

int zoom = GetDpiForWindow(window->m_hwnd);
float scale = (float)zoom / 96.0f;
width = (unsigned int)(width / scale);
height = (unsigned int)(height / scale);

As far as I know, there is no equivalent API on Mac platforms.

[hybcloud]

just double the font size, almost everthing in imgui adjust to font size.

[iaomw]

On Windows 10 1607 and above, the Win32 API GetDpiForWindow will fetch the DPI value for the specified window. The value is 96 by default, and the scaled UI size can be computed by:

int zoom = GetDpiForWindow(window->m_hwnd);
float scale = (float)zoom / 96.0f;
width = (unsigned int)(width / scale);
height = (unsigned int)(height / scale);

As far as I know, there is no equivalent API on Mac platforms.

There are surely some native API dealing DPI on macOS. Apple has its ownAPIs almost for anything.
If we don't want introduce new libraries, ImGui and GLFW could also do the job. ImGui is buggy though test, so prefer GLFW.

[hyv1001]

Should be fixed by #85, feel free to reopen if issue still exists