The three reverse MGPipeCallbacks entries become the SERVER session's producer callbacks
(Reserve + fill the head + copy the payload inline + PublishEvents; the host pointer never
reaches the wire), installed at Accept and uninstalled at Close, a second installation
over a claimed entry being Fatal{RoleViolation, callback-double-install}. Producers wired:
buffer writeback (the mapped bytes are copied into the record's inline tail instead of a
raw pointer in MGPBlobRef::Offset), GPU-written (Magma's three direct MarkGpuWritten
bypasses are routed through the callback), surface-changed (the backend posts
MGPSurfaceInfo; the client consumer replays the allocate/format writes against
pDefaultFramebufferInfo on the GL thread, where R3's ownership always was), and
kEventGlError = 4 for PipeInputs::RecordError (ordering stays P9's).
PipeInputs::InvalidateCompileEnv's forward is deleted with an active transport - R-12's
caps re-publication already does its job. The consumer's monolith guard is replaced by
the three segment arms (kSegEvent resolves through the session's SegmentTable;
kMGHostSpanSegNone is monolith-only and Fatal{ProtocolCorruption} on the wire; anything
else the same), and DrainEventRing calls the client consumers BY NAME, never through the
global table. Overflow is Fatal{EventRingOverflow} - P5c's events are lossless, P9 owns
the drop policy. Monolith arms keep the pre-P5c expressions character for character.
Evidence: unit 2139/2139 (incl. the new kEventGlError round-trip), integration-split
107/107, monolith GPU subset 24/24; negative control executed - a writeback blobref
reverted to the raw-pointer shape turns DirectGLES.Split.AtomicCounterScenario.
SubDataAfterDispatchSurvivesAnImmediateReadback red with Fatal{ProtocolCorruption,
OnBufferWriteback.Seg}. CONTRACT-P5C sections 1, 4.
StagedTextureStore (MG_Remote/Server/StagedTextureStore.h), the texture twin of R-11's
StagedShadowStore: keyed by the wire handle (a twin-address key would force glGenTextures
at adopt time), coverage = the whole staged run per (uploadTarget, level), defined-ness
tracked from the respecify hook so sparse chains keep their holes. ApplyTextureUpload
adopts the staged bytes at the last instant they are alive (rule C) through three new
disaggregated-only MGPipeResourceOps members; SyncMipmapsToBackend's four arms read the
store and the descriptor instead of the client's MipmapStorage (texels, extent, target,
defined-ness, dirty); Magma's GenerateMipmap marks the server shadow Defined+GpuDirty
instead of writing the client's level storage (T5). Monolith arms reproduce the pre-tx
expressions character for character behind the same macro discipline as P4a.
Evidence: unit 2147/2147 incl. two named-Fatal death tests and the copies/no-copies
difference suite; DirectGLES.Split 104/104 on WSL GPU; red-once - reverting the adoption
to pointer-dropping turns exactly StagedTextureProductionTest red; the two monolith lane
failures reproduce on the base commit (DirectVulkan.IterationRPProgram203Scenario,
DirectVulkan.F1WireScenario.GenerateMipmapPackedFloatPixels). CONTRACT-P5C section 2.
Texture staged shadow ownership and exact per-level coverage (tx); SEG_EVENT blobref convention with Seg = kSegEvent plus the kEventGlError kind, producer ownership and the consumer segment arm that replaces the monolith guard (ev); handle-keyed sink and twin resolution with MGPipeSlots() ruled a client-only surface (hd); the applier_reset (77) and object_death (78) control records (ct); set_context_values (79) and the residual-value field table retiring every value-class BARRIER_PULLED row (rv); the two Fatal{RoleViolation} guard layers with InBarrierWait wired rather than deleted (gt); FieldOwnership.def and Table 3 amendments; the six E-P5c exit gates.
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