Optix 8 abi bump

[njroussel]

Description

This PR is part of a series to upgrade to OptiX 8.0:

• Dr.Jit-core PR: Bump OptiX ABI version to 87 (OptiX 8.0) drjit-core#117
• Dr.Jit PR: Update drjit submodule (upgrade to OptiX v8.0) drjit#332

It introduces the following changes:

• Update of OptiX interfaces and structs
• Reduce programs to OptiX pipeline
• Changes to OptixDenoiser interface

⚠️ NOTE: The resources/data submodule must be updated prior to merging this PR.

Testing

No new tests were added. Tests for OptixDenoiser were updated due to the new interface.

[merlinND]

Hi @njroussel,

Does this API bump change the minimum supported driver version? (Just to make sure that it is documented and checked at runtime).

[wjakob]

Just to make sure that it is documented and checked at runtime

There is an error message in Dr.Jit-Core when OptiX is first used. But the Mitsuba documentation likely needs an update.

[wjakob]

This looks great. For posterity, can you explain the simplification?

Simplification to submission of programs to OptiX pipeline

[njroussel]

This looks great. For posterity, can you explain the simplification?

Simplification to submission of programs to OptiX pipeline

I can't even tell what I originally wanted to write, that's just a typo mess.

This is the relevant commit: 3a6aa70
In short, OptiX validation now raises errors when it sees programs in the pipeline that are unused. So now, there's a filtering step to make sure we only include the different programs of shapes that are in the scene.

Does this API bump change the minimum supported driver version? (Just to make sure that it is documented and checked at runtime).

I didn't think to check the Mitsuba docs, there were a few places that mentioned the required driver version. I pushed a commit to update those.