Wavefront Path Tracer

This is where I will take my cpu and gpu versions of my path tracer and convert them to wavefront tracers.

At this starting point, I have developed a GPU and CPU version of a ray tracer based on Peter Shirley's excellent first book (though I implemented a BVH tree from book 2). This is located in my path_tracer repository.

Progress:

• split megakernel into generate_rays, extend, shade, miss, and accumulate kernels
• created kernel structure to avoid all of the initial duplicate code
• moved timestamping into kernels
• wavefront path tracer now working

To do:

• contemplate whether this runs fast enough...doesn't seem like it
• currently don't understand the workgroup sizing
• split shade into by-material shade kernels
• split rendering of image into chunks so that the buffers aren't so big

Future updates:

• add other geometric shapes
• add textures
• start loading in obj files for cooler scenes to render
• start increasing complexity by implementing some features from Physically Based Rendering