Was facing again problem with undefined USE_GLES2 on custom platform build and I think we can now define USE_GLES2 right in mozilla-defines.h i default provider is EGL instead of defining multiple platforms which kindof should have it enabled

Comment on attachment 611762 [details] [diff] [review] Define use_gles2 for EGL providers globally Review of attachment 611762 [details] [diff] [review]: ----------------------------------------------------------------- I'm tempted to say this should probably be more generic (that is, having a define for the default backend, for all values of the default backend) I'm wondering, though, if it's expected that USE_GLES2 is undefined on windows, or does USE_GLES2 implies EGL is the default (which it is not on windows).

What's the point of USE_GLES2? MXR finds only 9 uses of it, and it seems to be for all the wrong reasons: http://mxr.mozilla.org/mozilla-central/search?string=USE_GLES2 http://hg.mozilla.org/mozilla-central/file/fc1432924480/gfx/gl/GLContext.h#l534 here, USE_GLES2 is used to initialize GLContext::mIsGLES2. That's bogus. A given platform could have both ES and non-ES providers. The right way to know if a context is ES is: has it been created by EGL? http://mxr.mozilla.org/mozilla-central/source/gfx/gl/GLContext.cpp#2301 this should use mIsGLES2 http://mxr.mozilla.org/mozilla-central/source/gfx/gl/GLContext.cpp#2373 http://mxr.mozilla.org/mozilla-central/source/gfx/gl/GLContext.cpp#2478 this should either use mIsGLES2 or, if one really doesn't want to compile some code in the other path, move code to a virtual function that's overridden in the EGL provider to provide the ES variant. Let's kill USE_GLES2.

To be clear, there was a real bug here: on Windows, USE_GLES2 was not defined but ANGLE provides GLES2, so we'd have run into trouble if we had tried to use ANGLE for layers like Chromium does, or if USE_GLES2 usage had crept into the parts of GLContext that WebGL uses.

Here's my counter-offer :-)

Comment on attachment 613109 [details] [diff] [review] kill USE_GLES2 Yeah, I like this idea more too., tested quickly and it works also good