5abf42012d
In detail:
- Direct accesses of state attributes are replaced with the INTEGRATOR_STATE and INTEGRATOR_STATE_WRITE macros.
- Unified the checks for the __PATH_GUIDING define to use # if defined (__PATH_GUIDING__).
- Even if __PATH_GUIDING__ is defined, we now check if the feature is enabled using if ((kernel_data.kernel_features & KERNEL_FEATURE_PATH_GUIDING)) {. This is important for later GPU ports.
- The kernel usage of the guiding field, surface, and volume sampling distributions is wrapped behind macros for each specific device (atm only CPU). This will make it easier for a GPU port later.
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