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You would need to do on the fly reprogramming which is slow. The game designer would have to be intimately familiar w the fpga architecture and the game software complexity would increase ridiculously. Fpga density cannot rival dedicated gpu gate density for dedicated rasterizing, etc. I doubt performance would improve at all. Game computations are dominated by what gpus are built for.

I should also note that an FPGA will not perform as well as a custom ASIC (such as a GPU) in terms of speed, power, or price (in significantly large quantities). An FPGA can be a very good options for moderate to low volume applications. You are correct with your description of a potential FPGA application. I would say it could rival or exceed the performance of the GPU solution.

Well, I should say, it won't rival a dedicated GPU once you factor in cost.

ah, ok. thanks.