Adds a check to find if the renderer is Intel DG (i.e. DG2).
gl_device: Detect Mesa to disable their ASTC
In our testing, our own ASTC decoder has shown itself to perform faster
than the included one from the driver. Disable theirs when Mesa is
detected.
Mesa detection depends on the vendor string. Some drivers never appear
outside of *nix contexts, so only check those in the *nix context.
gl_device: Internalize Intel DG detection
The new enum macros don't support setting values directly.
For LastAA and LastFilter, this means we need a simpler approach to loop
around the toggle in the frontend...
We can iterate through the AdvancedGraphics settings and generate the UI
during runtime. This doesn't help runtime efficiency, but it helps a ton
in reducing the amount of work a developer needs in order to add a new
setting.
There are still some other issues not addressed here, but it's a start.
Workarounds for false-positive reports:
- `RasterizerAccelerated`: Put a gigantic array behind a `unique_ptr`,
because UBSan has a [hardcoded limit](https://stackoverflow.com/questions/64531383/c-runtime-error-using-fsanitize-undefined-object-has-a-possibly-invalid-vp)
of how big it thinks objects can be, specifically when dealing with
offset-to-top values used with multiple inheritance. Hopefully this
doesn't have a performance impact.
- `QueryCacheBase::QueryCacheBase`: Avoid an operation that UBSan thinks
is UB even though it at least arguably isn't. See the link in the
comment for more information.
Fixes for correct reports:
- `PageTable`, `Memory`: Use `uintptr_t` values instead of pointers to
avoid UB from pointer overflow (when pointer arithmetic wraps around
the address space).
- `KScheduler::Reload`: `thread->GetOwnerProcess()` can be `nullptr`;
avoid calling methods on it in this case. (The existing code returns
a garbage reference to a field, which is then passed into
`LoadWatchpointArray`, and apparently it's never used, so it's
harmless in practice but still triggers UBSan.)
- `KAutoObject::Close`: This function calls `this->Destroy()`, which
overwrites the beginning of the object with junk (specifically a free
list pointer). Then it calls `this->UnregisterWithKernel()`. UBSan
complains about a type mismatch because the vtable has been
overwritten, and I believe this is indeed UB. `UnregisterWithKernel`
also loads `m_kernel` from the 'freed' object, which seems to be
technically safe (the overwriting doesn't extend as far as that
field), but seems dubious. Switch to a `static` method and load
`m_kernel` in advance.
