daedalus_ctx now owns a v3d_runner when V3D is available. The
public API's dispatch_vp9_idct8 routes QPU calls through a
new dispatch_idct8_qpu helper that: (1) lazy-creates the cycle 1
v4 pipeline on first use, (2) allocates 3 host-visible SSBOs
per call (coeffs/dst/meta), (3) memcpy host->GPU, (4) dispatch
with the v4 32-blocks-per-WG geometry, (5) memcpy GPU->host.
Per-call alloc is intentional for Phase 8 correctness-first
scope; buffer-pool perf optimization is deferred.
Added daedalus_ctx_create_no_qpu() for fast-path callers that
know they want CPU only.
test_api_idct extended to a 3-mode matrix: CPU forced, QPU
forced, AUTO recipe. All three deliver 4096/4096 bit-exact
on hertz with V3D 7.1.7.0:
recipe substrate for VP9_IDCT8: 2 (QPU)
[CPU] 4096/4096 bit-exact
[QPU] 4096/4096 bit-exact (real QPU dispatch through the API)
[AUTO] 4096/4096 bit-exact (recipe routes to QPU)
Next Phase 8 sub-step: same wiring pattern for cycle 2 LPF wd=4
and cycle 4 LPF wd=8 (the other two recipe-QPU kernels).
Cycle 3 MC and cycle 5 CDEF only need the dispatch hook
(recipe routes to CPU; QPU stays opportunistic via explicit
override).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
include/daedalus.h: stable C API surface exposing the 5 cycles
(VP9 IDCT 8x8, LPF wd=4, MC 8h, LPF wd=8; AV1 CDEF). Per-kernel
recipe-dispatch helpers default to the cycle 1-5 verdict
substrate (QPU for cycles 1+2+4, CPU for cycles 3+5); explicit
override available for benchmarking and runtime-aware scheduling.
src/daedalus_core.c: NEON-path implementation of all 5 kernels
wrapped behind the public API. QPU path stubbed out (returns -1)
since wiring v3d_runner into daedalus_ctx is the next Phase 8
sub-step; with has_qpu=0 the recipe falls back to CPU cleanly.
tests/test_api_idct.c: 64-block IDCT through the public recipe
dispatch, bit-exact vs C ref. PASS 4096/4096 bytes — proves the
API surface compiles, library links, dispatch routing works, and
NEON fallback delivers correct results.
docs/phase8_scoping.md: architecture options (A=userspace V4L2,
B=kernel V4L2 shim, C=direct libva); pick A for v1; explicitly
out-of-scope work tracked.
Next Phase 8 sub-step: wire v3d_runner into daedalus_ctx so
has_qpu=1 and QPU dispatch goes through the API too. After that:
V4L2 ioctl glue, bitstream parser, superblock loop.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
marfrit