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[MG_Backend] (Disaggregated): order Magma GPU work and defer wire object retirement

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swung0x48
2026-09-20 04:11:36 -04:00
parent c1960fdfaa
commit 51e61ddabe
14 changed files with 277 additions and 69 deletions
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MobileGL/MG_Backend/Init.cpp
+7 -16
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@@ -96,11 +96,12 @@ namespace MobileGL::MG_Backend {
// the apply thread reading client memory that has already moved, which renders wrong
// rather than aborting.
constexpr Bool kMGPipeP5eRunAheadReady = true;
constexpr Bool kMGPipeMagmaRunAheadReady = false;
// The Magma transport now owns buffer stores and consumes their vertex,
// index and shader binding records. Both backends publish the resource
// family only alongside a real op table (checked below). This does not
// publish kCapRunAheadApply: Magma keeps its existing lockstep contract.
// itself establish run-ahead readiness: that has its separate gate below.
Uint64 ConsumedSubsystemsFor(BackendType type) {
switch (type) {
case BackendType::DirectGLES: return MG_Pipe::kMGPipeSubsystemsMigratedAtP5e;
@@ -186,21 +187,11 @@ namespace MobileGL::MG_Backend {
serverBackend->GetBackendFunctions().GL.EndTransformFeedback != nullptr) {
capBits |= MG_Pipe::kCapBackendOwnsXfbCapture;
}
// P5e (CONTRACT-P5E.md §1, §6): kCapRunAheadApply, THE DIRECTGLES ARM AND ONLY IT.
//
// Magma is deliberately absent and is not an omission: it keeps the lockstep for
// the whole of P5e, its four apply-thread allocator sites are real debt P7 retires,
// and MGPipeApplierCurrentRecordIsBarriered() answers true for every record on a
// server that does not publish this bit - which is exactly what keeps those probes
// and its BARRIER_PULLED reads inside P5C's semantics and its rsp accounting
// honest. Publishing the bit here for DirectVulkan would turn accounted pulls into
// torn ones, so MagmaPipeIdentityTest pins its absence.
//
// The Espryt arm is gated on kMGPipeP5eRunAheadReady, which is false until the
// integration commit: the bit is what ARMS the client, so every package before it
// lands inert.
capBits |= MG_Pipe::MGPipeRunAheadCapBitsFor(MG_Config::ActiveBackendType,
kMGPipeP5eRunAheadReady);
// Each backend has an independent implementation-readiness gate.
// The runtime RunAhead knob can decline the feature, never create it.
const Bool runAheadReady = MG_Config::ActiveBackendType == BackendType::DirectVulkan
? kMGPipeMagmaRunAheadReady : kMGPipeP5eRunAheadReady;
capBits |= MG_Pipe::MGPipeRunAheadCapBitsFor(MG_Config::ActiveBackendType, runAheadReady);
session.SetCapabilityBits(capBits);
session.SetBackend(loop.Backend());