[clutter] cogl_enable_depth_test(TRUE) bug with eglx backend

[Gregoire Gentil]

Hello,

I'm experiencing a very strange bug on an OMAP3 + clutter 0.8.6 compiled
-with-flavour=eglx and --with-gles=2.0.

When I cogl_enable_depth_test(TRUE), I get some random noise instead of
my actors in the stage. When the value is FALSE, there is no problem at
all.

First question: should I expect a bug in clutter or am I triggering a
bug in the 3D GLES2.0 driver due to a special call in case of
depth_test? In other words, has anyone managed to
run cogl_enable_depth_test(TRUE) on eglx / gles=2.0?

Second question: can anyone explain to me what happens in the backend
when cogl_enable_depth_test==TRUE? Where is it in the code?

Third question: where should I start to debug this problem?

Thanks in advance,

Gregoire


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