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radv: Implement ray-tracing for older generations

Joshua Ashton requested to merge JoshuaAshton/mesa:radv-vega-rt-pullrequest into main

This PR implements ray-tracing for older generations (Navi, Vega, Polaris, etc.)

It does this by emulating the AMD bvh intersection instructions in software.

Right now this passes CTS the same as on RDNA 2 cards.

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