It looks like Mac OS X support is a work in progress. Feel free to contribute a tested patch!

Created attachment 3102 [details]
Add GLESv2 & EGL support for macOS via Goolge ANGLE implementation

Ok, here is it :)

Created attachment 3103 [details]
Add GLESv2 & EGL support for macOS via Goolge ANGLE implementation

Patch added, thanks!
https://hg.libsdl.org/SDL/rev/bc7ca7cfa6ca

Hi Sam Lantinga !)

There are 2 new files SDL_cocoaopengles.h/.m was added in my patch but they're not has been committed to hg repo.

I put the two missing files into revision control: https://hg.libsdl.org/SDL/rev/49f8fb4f6ce2

--ryan.

Oops, thanks Ryan!

Please add this improvement in WhatsNew.txt file

Can you add a patch with a patch note that you'd like for this? ;)

Here's the patch note I added:
Added support for OpenGL ES using ANGLE when it's available

Thanks!)

You're welcome! :)

It looks like configure isn't adding EGL on MacOS even with ANGLE in place.
INFO: SDL_GL_CreateContext(): SDL not configured with EGL support

I can throw AC_DEFINE(SDL_VIDEO_OPENGL_EGL, 1, [ ]) into CheckMacGL then get:
INFO: SDL_GL_CreateContext(): Could not create EGL context (call to eglCreateContext failed, reporting an error of EGL_BAD_CONFIG)

Created attachment 3184 [details]
configure patch

Seems SDL_VIDEO_OPENGL_EGL is not enough.
Try to add defines from this patch

Created attachment 3185 [details]
testgles2 screenshot

post 3184 attachment - screenshot

Created attachment 3186 [details]
testgl2 screenshot

added for comparison sake

Thanks Andrey, attachment 3184 [details] resolves the EGL issue in configure.
It now looks like I'm getting only a quarter of the image being displayed in testgles2 comparing to testgl2.

testgles2 https://bugzilla.libsdl.org/attachment.cgi?id=3185
testgl2 https://bugzilla.libsdl.org/attachment.cgi?id=3186

(In reply to AriaMoKr from comment #17)
> Thanks Andrey, attachment 3184 [details] resolves the EGL issue in configure.
> It now looks like I'm getting only a quarter of the image being displayed in
> testgles2 comparing to testgl2.

Strange, but samples looks fine on my Mac mini late 2012.

Try other samples with '--renderer opengles2' parameter.

Created attachment 3187 [details]
testgles2 demo

Try to use this angle library (compiled by me for OSX 10.9 and up few month ago from latest google repo):
https://www.dropbox.com/s/uu3fcsb0bpnskhv/ANGLE_MacOS.zip?dl=0

May be it's a bug with retina display?
Try to run samples without retina

Bingo! It looks to be a retina issue, trying with an external (non retina) display works just fine.

I didn't suspect it to be a retina issue earlier because I wasn't the same behavior running testgl2, so maybe something specific to ANGLE.
Running something like testdraw2 with --renderer opengles2 will also show the same bottom left quarter view problem.

Testing disable of retina via "sudo defaults write 
/Library/Preferences/com.apple.windowserver.plist DisplayResolutionEnabled -bool true" didn't seem to work for me (probably High Sierra issue) but I was able to run SwitchResX to give me a non-retina mode and that fixed it as well.

Running the attached libraries didn't change the behavior.

Also try to pack app to bundle with

<key>NSHighResolutionCapable</key>
<true/>

I packed the testgles2 into an app bundle and that ended up fixing it even without setting NSHighResolutionCapable (or having to create a Info.plist).

mkdir -p testgles2.app/Contents/MacOS 
cp testgles2 testgles2.app/Contents/MacOS
./testgles2.app/Contents/MacOS/testgles2

seems to work fine, but just ./testgles2 gave me the quarter display issue.
(executing both while in my ~/hg/SDL/test directory).

(In reply to AriaMoKr from comment #24)

> seems to work fine, but just ./testgles2 gave me the quarter display issue.

Fine!)

Sam Lantinga, please add apply this patch to configure script to enable gles2 support

https://bugzilla.libsdl.org/attachment.cgi?id=3184

Added, thanks!
https://hg.libsdl.org/SDL/rev/c808a74c019e