Ray tracing tutorial on GLSL? [closed]

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I haven't found a good ray tracing tutorial on GLSL, I found one on CUDA that's great, but I really want a GLSL one too. I read the Stanford Graphics paper on GPU ray tracing and I want to see a GLSL implementation.

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Shading languages really aren't meant for raytracing. The structure of a rasterizer just doesn't make them a good fit for most raytracing tasks. Yes, raytracers can use rasterizers to do parallel ray computations, and that's good. But the bulk of the algorithm doesn't fit the needs of a rasterizer.

Indeed, now that there are GP-GPU specific languages like OpenCL and CUDA, most of the research time and money is invested in them, not in shoehorning GP-GPU functionality into a rasterizer. It just isn't worth the effort to work around the limitations of a rasterizing pipeline to do raytracing; you'll get better performance with a real GP-GPU language.

And isn't performance the whole reason to do GP-GPU to begin with?