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b1f22c6317
The cross thread constant support appears on Haswell. It allows us to upload a set of uniform data for all threads without duplicating it per thread. One complication is that cross-thread constants are loaded into registers before per-thread constants. Previously, our local IDs were loaded before the uniform data and treated as 'payload' data, even though they were actually pushed into the registers like the other uniform data. Therefore, in this patch we simultaneously enable a newer layout where each thread now uses a single uniform slot for a unique local ID for the thread. This uniform is handled specially to make sure it is added last into the uniform push constant registers. This minimizes our usage of push constant registers, and maximizes our ability to use cross-thread constants for registers. To swap from the old to the new layout, we also need to flip some lowering pass switches to let our driver handle the lowering instead. We also no longer force thread_local_id_index to -1. v4: * Minimize size of patch that switches from the old local ID layout to the new layout (Jason) Cc: "12.0" <mesa-stable@lists.freedesktop.org> Signed-off-by: Jordan Justen <jordan.l.justen@intel.com> Reviewed-by: Jason Ekstrand <jason@jlekstrand.net> |
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