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[Feat] (MG_Remote, P5b/t2): emit the four stream-output span rows, the XFB object bind and the patch parameter, and give each ServerVerbSink body its backend call

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swung0x48
2026-09-16 12:23:57 -04:00
parent c240557fe0
commit dd293203ca
3 changed files with 254 additions and 22 deletions
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MobileGL/MG_Remote/Client/EmitTables.cpp
+156 -8
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@@ -16,6 +16,12 @@
// changes class without changing the arithmetic is a build break rather than a behaviour
// change nobody reviewed.
//
// P5b MOVES SLOTS FROM C TO B, ONE PACKAGE AT A TIME (MG_Remote/CONTRACT-P5B.md §7). The three
// numbers above are the partition AT THE P5b CONTRACT COMMIT and they are the ones the contract
// states; the arithmetic below is what the tree currently has, and the per-package ownership
// assertions say which package moved which slot. On this head t2 has landed: class B is 5 + 6
// and class C is 58.
//
// THE PRE-VERB HOOKS RUN BEFORE THE RECORD, NEVER AFTER (b1, ID-18). PushPersistentMapsBeforeVerb
// publishes the bytes an application wrote through a coherent map with no API call at all, and
// MarkGpuWritesForDraw builds the conservative GPU-write set the client now owns. Both describe
@@ -428,6 +434,132 @@ namespace MobileGL::MG_Remote::Client {
session.PumpControlPlane();
}
// =============================================================================
// CLASS B - P5b package t2: the transform-feedback spans, the XFB object bind and the
// tessellation patch parameter (MG_Remote/CONTRACT-P5B.md §2 t2).
// =============================================================================
//
// SIX SLOTS, SIX ROWS, AND NOT ONE OF THEM STARTS A SHADER. Every one of the six is a
// control call - it opens, closes, pauses, resumes or re-targets a capture span, or sets
// the patch size the next tessellation draw uses - so each takes BeforeReadOnlyVerb(),
// which is CONTRACT-P5B.md §4's rule for "a verb that reads buffers but starts no
// shader" naming the XFB and patch controls by hand. The GPU-WRITE MARK FOR THE CAPTURE
// TARGETS IS NOT TAKEN HERE and that is deliberate: it belongs at the END of the span,
// after the record and before GLContext::EndTransformFeedback clears the live bindings,
// which is exactly where b1 already put it (GL_Drawing.cpp's
// MarkEndTransformFeedbackCaptureTargets). Taking it here as well would mark the same
// buffers twice and taking it INSTEAD of there would mark nothing.
//
// RULE D (CONTRACT-P5B.md §0): each record carries the GL arguments the frontend handed
// the backend slot and nothing that is a READING of them. The capture program, the
// capture-buffer bindings, the patch state and the bound XFB object all stay
// BARRIER-PULLED - the server's backend reads the client's gPipeInputs fill of the
// moment, which MGP_FILL at each call site has just written and the verb barrier holds
// still (R-1). That is why these are six two-line emitters and not an XFB protocol.
//
// WHAT MUST HAVE CROSSED BEFORE begin_stream_output, since it is the ordering question
// this package was asked: the capture buffers' own resource records (emitted at their
// own call sites through the resource family, long before this point), the program
// (the CSO/program family, likewise), and the buffer BINDINGS - which do not cross as a
// record at all, because set_stream_output_targets (39) has no producer and no consumer
// and CONTRACT-P5B.md §2 rules it NOT required for t2: under the barrier the server's
// StartPendingTransformFeedback reads them through the kXfbSpan/kDraw pulls
// (GetTransformFeedbackProgram, GetBufferBindingPoint). Producing that row is P9's.
void EmitBeginTransformFeedback(GLenum primitiveMode) {
ClientSession& session = RequireSession("BeginTransformFeedback");
BeforeReadOnlyVerb();
MG_Pipe::MGPStreamOutputBegin record{};
// The GL token verbatim (contract table 0's "GL enums on the wire"): the sink hands
// it to the backend slot that takes it, and nothing between here and there reads it.
record.PrimitiveMode = static_cast<Uint32>(primitiveMode);
session.EmitAndWait(MG_Pipe::MGPWireOp::BeginStreamOutput, &record, sizeof(record),
nullptr, 0, nullptr, 0, nullptr);
}
void EmitEndTransformFeedback() {
ClientSession& session = RequireSession("EndTransformFeedback");
BeforeReadOnlyVerb();
MG_Pipe::MGPXfbAccounting record{};
// THE ACCOUNTING IS THE CLIENT'S OWN AND IT IS INFORMATIONAL ON THIS SIDE OF THE
// WIRE: end_stream_output's backend call takes no arguments, and the three numbers
// are what the frontend has counted over this span (CONTRACT-P5B.md §2 t2, the
// companions row). They travel because the row has carried them since P4a and
// because they are what a server-side scatter would need when P9 lands one; the
// sink today calls GL.EndTransformFeedback() and reads none of them. Read here,
// BEFORE GLContext::EndTransformFeedback resets the counters at the call site.
const auto& context = *MG_State::pGLContext;
record.CapturedVertices = context.GetTransformFeedbackCapturedVertices();
record.PrimitivesWritten = context.GetTransformFeedbackPrimitiveCounter();
record.PrimitiveMode = static_cast<Uint32>(context.GetTransformFeedbackPrimitiveMode());
session.EmitAndWait(MG_Pipe::MGPWireOp::EndStreamOutput, &record, sizeof(record),
nullptr, 0, nullptr, 0, nullptr);
}
void EmitPauseTransformFeedback() {
ClientSession& session = RequireSession("PauseTransformFeedback");
BeforeReadOnlyVerb();
// Reserved IS zero and the contract says so (MGPStreamOutputControl{Reserved = 0}).
// The row exists to BE the verb boundary - the stamp the server puts up before the
// sink runs - not to carry anything.
MG_Pipe::MGPStreamOutputControl record{};
record.Reserved = 0;
session.EmitAndWait(MG_Pipe::MGPWireOp::PauseStreamOutput, &record, sizeof(record),
nullptr, 0, nullptr, 0, nullptr);
}
void EmitResumeTransformFeedback() {
ClientSession& session = RequireSession("ResumeTransformFeedback");
BeforeReadOnlyVerb();
MG_Pipe::MGPStreamOutputControl record{};
record.Reserved = 0;
session.EmitAndWait(MG_Pipe::MGPWireOp::ResumeStreamOutput, &record, sizeof(record),
nullptr, 0, nullptr, 0, nullptr);
}
void EmitBindTransformFeedback(GLuint name) {
ClientSession& session = RequireSession("BindTransformFeedback");
BeforeReadOnlyVerb();
MG_Pipe::MGPStreamOutputBind record{};
// THE GL NAME IS NOT AN IDENTITY (ARCHITECTURE 4.2.1) and is carried anyway, because
// it is the key the backend has always used: Espryt indexes its driver objects by it
// (XfbImpl::g_xfbObjects[name], DirectGLES.cpp:1401) and generates the ES object on
// first bind. Name 0 is the default object, which is why the field is not a handle.
record.GlName = static_cast<Uint32>(name);
// Beside it, the identity that WILL dispatch: the frontend's per-object lifetime id,
// process-wide and never reused, which is what survives glGenTransformFeedbacks
// recycling a name. Read AFTER GLContext::BindTransformFeedbackObject at the call
// site, so it is the id of the object being bound and not of the previous one.
record.LifetimeId = MG_State::pGLContext->GetBoundTransformFeedbackLifetimeId();
session.EmitAndWait(MG_Pipe::MGPWireOp::BindStreamOutput, &record, sizeof(record),
nullptr, 0, nullptr, 0, nullptr);
}
void EmitPatchParameteri(GLenum pname, GLint value) {
ClientSession& session = RequireSession("PatchParameteri");
BeforeReadOnlyVerb();
MG_Pipe::MGPPatchParameter record{};
// GL_PATCH_VERTICES is the only pname that reaches a backend slot - the frontend
// answers GL_PATCH_DEFAULT_*_LEVEL itself and bakes those into the synthesized
// control stage - and the frontend has already rejected every other pname with
// INVALID_ENUM before this call (GL_Drawing.cpp's PatchParameteri). Carried verbatim
// so the sink reproduces the call rather than a reading of it.
record.Pname = static_cast<Uint32>(pname);
record.Value = static_cast<Int32>(value);
// set_patch_state (43) STILL TRAVELS, at the next validate, and that is not a
// duplicate: it is the applier's working-block copy, this is the driver push Espryt
// does AT THE CALL (DirectGLES.cpp:8760), and both pushes happen today on the
// monolith path too (CONTRACT-P5B.md §2 t2).
session.EmitAndWait(MG_Pipe::MGPWireOp::PatchParameter, &record, sizeof(record),
nullptr, 0, nullptr, 0, nullptr);
}
// =============================================================================
// CLASS A - answered locally from the caps mirror (R-15). NO RECORD, EVER.
// =============================================================================
@@ -530,13 +662,14 @@ namespace MobileGL::MG_Remote::Client {
X(MemoryBarrierByRegion, void, (GLbitfield)) \
X(ShaderStorageBlockBinding, void, (GLuint, const GLchar*, GLuint))
// t2 LANDED (CONTRACT-P5B.md §2 t2): the three measured slots - BeginTransformFeedback
// (95 lane entries), PatchParameteri (43), BindTransformFeedback (2) - and the three
// companions that share their rows are class B now and live in the block above.
// DeleteTransformFeedback is the one that stays: it has NO ROW in P5b, by ruling and
// not by omission (unmeasured; the driver object leaks on the server until P9's XFB
// namespace work, and a bind of name 0 is what the backend does on delete of the bound
// one, DirectGLES.cpp:1422). It therefore still aborts by its own name.
#define MGR_UNMIGRATED_T2_SLOTS(X) \
X(PatchParameteri, void, (GLenum, GLint)) \
X(BeginTransformFeedback, void, (GLenum)) \
X(EndTransformFeedback, void, ()) \
X(PauseTransformFeedback, void, ()) \
X(ResumeTransformFeedback, void, ()) \
X(BindTransformFeedback, void, (GLuint)) \
X(DeleteTransformFeedback, void, (GLuint))
#define MGR_UNMIGRATED_F1_SLOTS(X) \
@@ -645,7 +778,9 @@ namespace MobileGL::MG_Remote::Client {
constexpr Uint32 kEmittedSlotsP5 = 5; // Clear, DrawArrays, ReadPixels, Blit, Present
constexpr Uint32 kEmittedSlotsD1 = 0;
constexpr Uint32 kEmittedSlotsI1 = 0;
constexpr Uint32 kEmittedSlotsT2 = 0;
// t2: BeginTransformFeedback, EndTransformFeedback, PauseTransformFeedback,
// ResumeTransformFeedback, BindTransformFeedback, PatchParameteri.
constexpr Uint32 kEmittedSlotsT2 = 6;
constexpr Uint32 kEmittedSlotsF1 = 0;
constexpr Uint32 kEmittedSlots =
kEmittedSlotsP5 + kEmittedSlotsD1 + kEmittedSlotsI1 + kEmittedSlotsT2 + kEmittedSlotsF1;
@@ -660,7 +795,10 @@ namespace MobileGL::MG_Remote::Client {
static_assert(kUnmigratedT2 + kEmittedSlotsT2 == 7, "t2 owns the 7 XFB/tessellation slots");
static_assert(kUnmigratedF1 + kEmittedSlotsF1 == 11, "f1 owns the 11 clear/copy/mip slots");
static_assert(kUnmigratedTail == 20, "the wave-3 tail is 20 slots and no P5b package owns one");
static_assert(kUnmigratedSlots == 64, "CONTRACT-P5.md §7 class C is 64 slots at the P5b contract commit");
// 64 at the P5b contract commit, minus the six t2 flipped. CONTRACT-P5.md §7's number
// is the one above, not this one; this is the arithmetic after t2 and it moves again
// for every package that lands.
static_assert(kUnmigratedSlots == 58, "class C is 58 slots after t2's six");
static_assert(kLocallyAnsweredSlots + kEmittedSlots + kUnmigratedSlots == kRemoteEmitSlotCount,
"the three classes no longer partition the 71 slots");
@@ -697,6 +835,16 @@ namespace MobileGL::MG_Remote::Client {
table.GL.ReadPixels = &EmitReadPixels;
table.GL.BlitFramebuffer = &EmitBlitFramebuffer;
table.Present = &EmitPresent;
// ---- class B, P5b t2. Assigned AFTER the class-C block above, which is what makes
// the flip a single-line change per slot: the Fatal thunk is overwritten, and a slot
// whose row is removed from MGR_UNMIGRATED_T2_SLOTS but not assigned here would be
// NULL and caught by RemoteEmitTable.NoSlotIsNull rather than silently skipped.
table.GL.BeginTransformFeedback = &EmitBeginTransformFeedback;
table.GL.EndTransformFeedback = &EmitEndTransformFeedback;
table.GL.PauseTransformFeedback = &EmitPauseTransformFeedback;
table.GL.ResumeTransformFeedback = &EmitResumeTransformFeedback;
table.GL.BindTransformFeedback = &EmitBindTransformFeedback;
table.GL.PatchParameteri = &EmitPatchParameteri;
return table;
}