MobileGL/docs/archive/notes/p5e/TASK-c0e.md

Package c0e — the contract and the wire (P5e; lands first, inert)

Read in this order, all of it: PACKAGE-PREAMBLE-P5E.md, INTEGRATOR-DECISIONS-P5E.md, BRIEF-P5E.md (§0, §1, §2 "c0e", §3, §6), CONTRACT-P5E-draft.md (all of it — you are landing it), then the scout reports your rows come from (scout-S6.md for the wait classes / knobs / caps bit, scout-S5.md for set_shader_buffers' encoding and bit 13, scout-S4.md for set_program_bindings / LinkStatus, scout-S3.md for the image Access decode, scout-S1.md for kDrawClientArrays, scout-S7.md for the seam declarations). All are in //wsl.localhost/Arch/home/swung/w7/notes/p5e/. Your slug is c0e; your tree is ~/w7/p5e-c0e (built, on branch p5e/c0e at 2fde7034).

Deliverables (all inert: no behaviour changes; unit + integration-split + gens stay green; G1 0/0/0/0)

1. MobileGL/MG_Remote/CONTRACT-P5E.md — the draft, edited into its landed form: apply the 19 rulings as decided in INTEGRATOR-DECISIONS-P5E.md (they mostly match the draft's recommendations), make every file:line resolve at the HEAD of your branch (run gens; the doc-citation lint covers MG_Remote/CONTRACT-P5*.md), remove "draft" wording, keep the voice of CONTRACT-P5C.
2. MobileGL/MG_Pipe/PipeCalls.def: the WaitClass column on every row exactly as CONTRACT-P5E §2.2 (kWaitNone / kWaitApplied / kWaitReply / kWaitPresent / kWaitByPredicate…), SetProgramBindings (opcode 80) appended in S4's shape. Extend the generator(s) that read the def (scripts/gen_pipe.py and whatever emits the wire/route/thunk tables — find them) so that MGPipeWaitClassFor(op) is generated, the new op has its codec layout / thunk / table slot / route row (null route, refused by name until pg lands), and every --check / --self-test stays green with the regenerated MobileGL/MG_Pipe/generated/*.inc committed. The ABI fingerprint (SessionRings.h) must change with the new opcode; pin it.
3. MobileGL/MG_Pipe/MGPipeTypes.h: kCapRunAheadApply (bit 10, MGPCapBit), MGPProgramBindings
   • its tail PODs, MGPProgramDesc::LinkStatus in the spare bytes, kDrawClientArrays draw flag, kMGPipeMaxBufferBindingPoints (84; pinned against BufferState.h's constant where both are visible), MGP_ASSERT_POD sizes; MGPipeValueTypes.h: MGPipeImageAccess enum with encode/decode (the client encode in ImageEmit.h already exists — move/alias, do not duplicate).
4. MobileGL/MG_Pipe/MGPipe.h: subsystem bit 13 (kMGPipeSubsystemBufferBindings), default mask 0x3fff; MG_Impl/Pipe/SetHashSuppressor.h: the three SetShaderBuffers class slots; MG_Impl/Pipe/Tracker.h: bits 15-17 mapped to subsystem 13 (MGPipeSubsystemForDirty); TrackerTest.cpp's bit table; MG_Pipe/FieldOwnership.def re-annotations (retiring phase P5e on the rows the brief names); MG_Pipe/Coverage.def rows as the contract lists.
5. MobileGL/Config.h / ConfigLoader.cpp: IpcTable::RunAhead (MOBILEGL_IPC_RUN_AHEAD, default 1, forced 0 under PipeVerify, logged in the IPC line), IpcTable::PresentCredit (MOBILEGL_IPC_PRESENT_CREDIT, default 1, range 1..8).
6. Seam declarations in MobileGL/MG_Pipe/PipeApply.h (+ .cpp bodies that assert "not landed" by name, never silently succeed): MGPipeApplierCurrentRecordIsBarriered(), MGPipeBarriered(op, payload, applierState) (the static column half implemented here; the XFB/client-array halves read the fields the contract names), the sb applier fields (BoundShaderBuffers[3], Start/Count/WritableMask[3], ShaderBuffersSerial) and MGPipeApplySetShaderBuffers declaration, the pg fields on MGPipeShaderCsoRecord (BlockBindings, SamplerUnits, StorageOverrides, BindingsSerial, LinkStatus) and MGPipeApplySetProgramBindings declaration, the by-handle sync signatures the family packages implement (SyncTextureToBackendByHandle, SyncMipmapsToBackendByHandle, ResolveVaoTwin(handle), ResolveProgramTwin(handle), ResolveTextureTwin(handle), the FBO/RBO SyncToBackendByHandle overloads) — declared where the brief says (Managers.h ranges) with asserting bodies, so every package compiles against the same names from day one.
7. MobileGL/MG_Backend/Init.cpp: kMGPipeP5eRunAheadReady = false and the DirectGLES arm that will publish bit 10 only when it is true (Magma never); MagmaPipeIdentityTest pins no bit 10.
8. MG_Test/Pipe/PipeCatalogueTest.cpp: sizes, opcode 80, the null route pin, the wait-class table (every row's class asserted against the contract table by name).
9. docs/Disaggregated/ROADMAP.md: the P5e row (status "进行中", the package list, the exit gate) inserted after P5d; CURRENT_STAGE_PROGRESS.md §1 row + §6 next-step line. Keep the citation lint green.

Red-once (execute, revert, record)

• Flip one row's WaitClass in the def without regenerating → gen_pipe.py --check red.
• Change the MGPProgramBindings POD size → PipeCatalogueTest red.
• Publish bit 10 on the Magma arm → MagmaPipeIdentityTest red.

Gate

build, unit, isplit, gens green; strict unchanged vs base (record its marker list in the report as the baseline the later packages must shrink). Commit in sensible slices (contract; def + generators + generated; types; knobs; seams + tests; docs).