"identified weaknesses in the PlayStation 4's GPU" No, we identified bugs. Bugs that make me tear my hair out when porting the driver.
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@libcg so I aligned the ring commands so there was no padding needed, then wrote a test value at the right offset, and it worked
@libcg now I'm working around it by using a FILL command instead of WRITE, which works (it fills with a single dword but we only need one).