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Fix scalar buffer reads across sparse guest mappings

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This commit is contained in:
nmzik
2026-10-16 18:19:09 +02:00
parent b899717900
commit d7974dc763
13 changed files with 250 additions and 290 deletions
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src/graphics/shader/recompiler/ir/passes/ResourceTracking.cpp
+20 -5
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@@ -3735,8 +3735,6 @@ private:
resource.written = resource.written || write;
resource.atomic = resource.atomic || atomic;
resource.formatted = resource.formatted || memory.formatted;
resource.scalar = resource.scalar || op == ValueOpcode::ReadConstBuffer ||
memory.kind == ResourceKind::ScalarBuffer;
}
uint32_t AddImage(uint32_t source, const MemoryInfo& memory, ValueOpcode op, uint32_t pc) {
@@ -3883,6 +3881,24 @@ private:
if (memory.planning_only || IsIndirectPlanningMemory(flags.index)) {
return;
}
if (op == ValueOpcode::ReadConstBuffer) {
const auto* handle = inst.Arg(0).Resolve().TryInstruction();
if (memory.kind != ResourceKind::ScalarBuffer || handle == nullptr ||
handle->GetOpcode() != ValueOpcode::GetBufferResource || handle->NumArgs() != 4u) {
Fail(flags.pc, "scalar buffer read requires a four-DWORD buffer descriptor");
}
// Scalar descriptors can span disjoint guest mappings. Keep their raw GPU operands
// separate from handles that vector-resource planning may rewrite.
auto* block = inst.Parent();
const auto where = std::ranges::find_if(block->Instructions(),
[&](const Inst& candidate) { return &candidate == &inst; });
auto& scalar = *block->PrependNewInst(where, ValueOpcode::GetBufferResource,
{handle->Arg(0), handle->Arg(1), handle->Arg(2), handle->Arg(3)});
inst.SetArg(0, Value(&scalar));
m_program.memory_info[flags.index].kind = ResourceKind::IndirectBuffer;
m_info.uses_dma = true;
return;
}
Inst* handle = nullptr;
uint32_t source = 0;
uint32_t resource = 0;
@@ -3894,12 +3910,11 @@ private:
source = indirect->source;
} else if (!GetHandle(inst.Arg(0), ValueOpcode::GetBufferResource, 4, flags.pc,
memory.resource * 4u, handle, source)) {
if (memory.kind != (op == ValueOpcode::ReadConstBuffer ? ResourceKind::ScalarBuffer
: ResourceKind::Buffer) ||
if (memory.kind != ResourceKind::Buffer ||
!memory.SupportsIndirectBufferLoad(op)) {
Fail(flags.pc,
"buffer descriptor is not a valid runtime value; GPU-selected access "
"requires a scalar, raw 8/16-bit, raw DWORD x1/x2/x3/x4, or formatted X load");
"requires a raw 8/16-bit, raw DWORD x1/x2/x3/x4, or formatted X load");
}
m_program.memory_info[flags.index].kind = ResourceKind::IndirectBuffer;
m_info.uses_dma = true;