The hang was caused by a subtle race. When a job is completed, its
thread must signal all the threads that might be waiting on this job.
The signaling code was attempting to signal only the minimum number
of threads -- this was important especially in the case where no threads
were waiting, then the call to notify() could be avoided.
Unfortunately, for performance reasons we're not calling notify() with
the condition lock held, this meant that between the time the number of
waiting threads was latched and the time of the notify() call, more
threads could enter their condition variable wait(), and it would
then be possible for these threads to wake up, instead of the thread
we were trying to wake up (the one waiting on the job).
It would then get stuck forever.
This bug was introduced in 2df639133b
Also add some debugging code for this kind of failure (disabled)
This wasn't very useful in the first place because we're recycling
handles very quickly. Additionally there was a race condition
which cause false positives.
This reverts commit bc6acd5c5a.
This reverts commit 3a15756c78.
When running semantic analysis on a material, we were arbitrarily choosing the first code gen permutation to analyze. So, running matc with arguments --api metal versus --api all would run analysis on slightly different shader code. This causes bugs when flags passed to glslang differ during semantic analysis. This change updates all semantic analysis to always use the same shader code.
When passing only 1 fence to vkWaitForFences, the `waitAll` argument
should not have any effect, but SwiftShader seems to skip the wait
when this argument is set to VK_FALSE.
More specifically, the failure to wait in `acquireWorkCommandBuffer`
causes the subsequent destruction of an in-use fence, which causes
a TSAN failure with Google's internal tests.
I am consulting with the SwiftShader team on a real fix, meanwhile
we can commit this easy workaround.
We have 5 usages of vkWaitForFences, one of which uses multiple fences
and should have used VK_TRUE anyway.
This prevents a SwiftShader crash and/or a slew of "no texture bound"
warnings that would appear when the client provides an IBL without
providing reflections texture, which should be a valid thing to do.
Note that it is okay to declare a sampler in GLSL that never gets bound,
as long as it is never sampled from. Since we always sample from the
IBL specular texture, we should always bind something to it.
With Vulkan, this warning would sometimes be a false positive. It could
trigger for internal samplers like `ssao` and `structure`, even though
they were not declared in SPIR-V.
With OpenGL, this warning would never be a false positive because it has
the luxury of calling `glGetUniformLocation`.
This adds a private attribute to our samplers called `strict` that
indicates whether or not a sampler should always have a bound texture.
For now the only strict samplers are the custom ones declared in the
user's material.
At some point I think we should consider adding `spirv-reflect` to our
tree to help with problems like this.
This fixes a bug seen with client applications that use ClearOptions
instead of Skybox, and one or more offscreen RenderTarget objects.
These apps would see junk pixels because Filament would only clear the
first render target in the frame.
The fix is to factor some the flag-setting logic in `beginFrame()` into
a private method, and call this method from `render()` each time
the user-level RenderTarget has been changed.
I wrote a simple C++ demo to reproduce the issue and to verify that
this fix works.
"description":"Real-time physically based rendering engine",
"main":"filament.js",
"module":"filament.js",
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