Add PBRT_CPU_GPU in some signatures;Move OptiX

mmp / pbrt-v4

Source code to pbrt, the ray tracer described in the forthcoming 4th edition of the "Physically Based Rendering: From Theory to Implementation" book.

https://pbrt.org

Apache License 2.0

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Closed jammm closed 1 month ago

jammm commented 1 month ago

This is to prepare for the next PR which will include the HIP port of pbrt-v4 from https://github.com/GPUOpen-Effects/pbrt-v4.