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[Fix] (Espryt, P8-C): the split server refreshes its staged copy of a buffer a shader wrote before a CPU reader consumes it - storage/atomic/buffer-image writes mark the server twin, XFB captures land in the copy, the restart rewrite, multi-draw rebase, *IndirectCount, CPU-fed indirect fields, XFB scatter and fp64 narrowing read through SplitHostBytesForCpuRead; GpuWrittenDrawInputScenario (12 cases) on the split arms

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swung0x48
2026-09-29 22:38:33 -04:00
parent 8d3e2317a6
commit e52a997f34
6 changed files with 1068 additions and 26 deletions
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MobileGL/MG_Backend/DirectGLES/MultiDraw.cpp
+7 -6
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@@ -191,15 +191,16 @@ namespace MobileGL::MG_Backend::DirectGLES::MultiDrawImpl {
if (question == IndexBufferQuestion::Presence) return view;
if (question == IndexBufferQuestion::HostBytes) {
// No Sync* pair here and none is missing: on this side the applier has
// already consumed the persistent-map blocks and the shader writebacks for
// this resource before the draw verb replayed, so the server's staged shadow
// IS the synced copy. That is also why this arm cannot be expressed as "find
// the object and run the monolith body".
// The applier has already consumed the persistent-map blocks for this
// resource before the draw verb replayed; the one Sync* this arm owes is the
// monolith's SyncGpuWrites, and (P8-C) SplitHostBytesForCpuRead is it: a store
// a shader wrote on this side is read back from this server's own GL buffer,
// because no writeback ever reaches the server's staged copy. That is also why
// this arm cannot be expressed as "find the object and run the monolith body".
auto* resource = BufferImpl::FindBufferResourceForHandle(res);
if (resource == nullptr) RefuseMissingIndexBufferRecord(entry, res, "backend resource");
view.Size = BufferImpl::ResourceWidthForHandle(res);
view.HostBytes = BufferImpl::SplitHostBytes(*resource);
view.HostBytes = BufferImpl::SplitHostBytesForCpuRead(*resource, res, "multidraw_index_rebase");
if (view.HostBytes != nullptr && IndexBufferRecordHasDefinedContent(st, res)) {
BufferImpl::RequireStagedCoverage(*resource, view.HostBytes, 0, view.Size,
"multidraw_index_rebase");