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Bug 2716

Summary: OS X w/ Retina: SDL_GL_GetDrawableSize differs from SDL_GetWindowSize even though SDL_WINDOW_ALLOW_HIGHDPI not used
Product: SDL Reporter: Eric Wasylishen <ewasylishen>
Component: videoAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: HG 2.0   
Hardware: x86   
OS: Other   

Description Eric Wasylishen 2014-09-04 02:23:12 UTC 
This may just be a documentation bug, but it was very confusing to me.

(on 15" macbook pro retina (2880x1800), OS X 10.9.4, resolution set to "best for display" mode in system preferences, not scaled.):

- launch testgl2 (included with sdl2) with "--fullscreen" and "--geometry 800x600"
- exit
- look in the xcode console, I get:

2014-09-03 20:12:01.503 testgl2[4085:303] INFO: Window Size   : 800,600
2014-09-03 20:12:01.503 testgl2[4085:303] INFO: Draw Size     : 840,525

This is surprising because the docs only say that SDL_GL_GetDrawableSize can differ from SDL_GetWindowSize if SDL_WINDOW_ALLOW_HIGHDPI is used. Perhaps the docs here: https://wiki.libsdl.org/SDL_GL_GetDrawableSize should say:
"This may differ from SDL_GetWindowSize() on a high-dpi display whether or not you request a high-dpi window using SDL_WINDOW_ALLOW_HIGHDPI.."

Tested on sdl2 hg cd6696d55781 (Sept 2, 2014)
Comment 1 Eric Wasylishen 2017-07-22 05:16:52 UTC 
No longer reproducible on macOS 10.12.5, (neither current HG nor Sept 2, 2014's version)
Comment 2 Sam Lantinga 2017-08-02 18:40:24 UTC 
Maybe fixed by the OS?