and a few more
Pixel Planes/Pixel Flow [1]
The Geometry Engine: A VLSI Geometry System for Graphics [2]
Tim Purcell's research [3]
BrookGPU [4]
GRAMPS: A Programming Model for Graphics Pipelines [5]
[1]: https://www.cs.unc.edu/~pxfl/
[2]: https://graphics.stanford.edu/courses/cs148-10-summer/docs/1...
[3]: http://graphics.stanford.edu/~tpurcell/