XMOS has no FPU, is slow and has so poor connectivity to the rest of the system it hardly makes any sense to spend resources trying to add 3D rendering support.
I'm certain there will be others that claim otherwise.
I have to agree. The XMOS looks handy for implementing very low latency interrupt handlers and things like that, but as a render accelerator? Hard to see how it's going to be as fast as the PA6T for that job.
Anyhow, GPU is the future of rendering.
Indeed. Actually, some of the best demonstrations I've seen use hybrid techniques where conventional rasterization (which is what the existing hardware excels at anyway) is used for primary rays and then compute kernels running on the GPU are invoked for the secondary rays where it is able to take advantage not only of the massive parallelism of the GPU but also the already-rendered depth and stencil buffers to cull certain rays.