1. mkdir -p ~/px/q37 2. Put the following in ~/px/q37/prefs.js user_pref("layers.force-active", true); user_pref("media.autoplay.enabled", false); user_pref("dom.disable_open_during_load", false); 3. firefox -profile ~/px/q37/ q37-a.html Result: 80% of the time, ###!!! ASSERTION: Texture initialization failed! -- error 0x506, Source 0, Source format 0, RGBA Compat 1: 'Error', file /Users/jruderman/trees/mozilla-central/gfx/layers/opengl/CompositorOGL.cpp, line 929 * Mac OS X 10.8.4 * MacBook Pro (15" from Early 2011) * Integrated graphics is active (Intel HD Graphics 3000) This is exactly the same error message as in bug 896054.

First time I tried this, I got a warning instead: WARNING: Framebuffer not complete -- error 0x8219, aFBOTextureTarget 0x0, aRect.width 1230, aRect.height 960: file gfx/layers/opengl/CompositingRenderTargetOGL.cpp, line 40 Error 0x8219 is GL_FRAMEBUFFER_UNDEFINED but I suppose that could be unrelated.

I also hit the other assert. Actually, they're much easier to hit if you run the optimized build, because of timing, and put something else in place to "flag" the assert.

You were spot on in bug 896054 comment 42: (In reply to Matt Woodrow (:mattwoodrow) from bug 896054 comment #42) > One vague guess would be that we're opening a new window and trying to > composite it before the native window is actually ready. In the testcase in this bug, we try to composite before the window has been shown. I don't know what's supposed to prevent us from doing that... do you? This patch feels like a workaround - we just return early instead of rendering while the window is still closed. Can this break anything? One thing I thought of is that this might cause us to ignore the composition request that we issue from viewWillDraw once the window actually is shown, but maybe the WindowOverlayChanged trick saves us here (I haven't checked).

Comment on attachment 813123 [details] [diff] [review] refuse-render-when-window-is-invisible >diff --git a/widget/cocoa/nsChildView.mm b/widget/cocoa/nsChildView.mm >-void >+bool > nsChildView::PreRender(LayerManager* aManager) > { > nsAutoPtr<GLManager> manager(GLManager::CreateGLManager(aManager)); > if (!manager) { >- return; >+ return false; This actually needs to return true, otherwise it breaks OMTC with basiclayers.

with comment 5 addressed

Markus, can this land?

Yes, sorry for the delay, it was blocked on bug 924771 but the test has now been disabled. https://hg.mozilla.org/integration/mozilla-inbound/rev/03f9c4191bf0 https://hg.mozilla.org/integration/mozilla-inbound/rev/8952c5133a67

https://hg.mozilla.org/mozilla-central/rev/03f9c4191bf0 https://hg.mozilla.org/mozilla-central/rev/8952c5133a67

Can you please request approval for whatever needs landing on 26 please?