MFX_QM_STATE and MFX_FQM_STATE hold separate register sets for the intra
and the inter scaling lists, but only the intra ones were programmed. The
hardware therefore quantized every inter residual with whatever those
registers happened to hold, so a coded P macroblock came back corrupted
while I frames were correct. That is why the P path shipped as skip-only.
With both sets programmed, P macroblocks can carry a real residual: encode
them as coded BP_L0_16x16 with a zero motion vector instead of forcing
P_Skip. A P frame now tracks changing content rather than repeating its
reference.
Measured on a 176x144 clip at QP 26, P frame luma PSNR against the true
source: 12.81 dB before, 43.87 dB after (the I frame scores 44.53 dB), at
2062 bytes versus the I frame's 4474. With an unchanged source the P frame
costs 67 bytes, down from 4862.
dEQP-VK.video.encode.h264.* goes from 12 to 14 passes with no new failures.
There is still no motion estimation, so a moving block costs a full residual
rather than a motion vector.
Co-Authored-By: Claude Opus 5 <[email protected]>
GPGPU_WALKER has no encoding for a zero group count, so passing one
through walks the full dimension and the command never retires, hanging
rcs0 (GPU HANG ecode 7:1:8ff8ffff, EIR and PGTBL_ER both clear). A zero
dispatch is legal and defined as a no-op, so drop it at record time.
through walks the full dimension and the command never retires, hanging
rcs0 (GPU HANG ecode 7:1:8ff8ffff, EIR and PGTBL_ER both clear). A zero
dispatch is legal and defined as a no-op, so drop it at record time.
Gen9+ uses COMPUTE_WALKER and handles this in hardware, which is why
upstream anv carries no equivalent guard.
Fixes dEQP-VK.compute.pipeline.basic.empty_workgroup_{all,x,y,z} and
empty_shader, which previously aborted the run and could take the whole
machine down. compute.pipeline.* now 20285 cases, 0 fail.
