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shader: leave the start instance out of mesh and NGG instance ID VGPRs

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Co-authored-by: Senaxx <michelbeld@gmail.com>
This commit is contained in:
nmzik
2026-10-26 07:00:41 +01:00
parent 5429888d4c
commit 943bc19f46
4 changed files with 11 additions and 13 deletions
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src/graphics/shader/recompiler/frontend/translate/Translate.cpp
+8 -9
View File
@@ -1244,12 +1244,12 @@ IR::Program TranslateProgram(const Decoder::Program& decoded, const CFG::Graph&
entry_ir.BitwiseOr(wave_info, entry_ir.BitwiseOr(entry_ir.ShiftLeftLogical(
primitive_count, u32(8)),
vertex_count)));
// Instance IDs exclude the start instance, which shaders add from user data.
if (mesh.fast_launch) {
// Fast launch broadcasts the subgroup's base vertex and instance to every lane.
entry_ir.SetVectorReg(static_cast<IR::VectorReg>(5), entry_ir.IAdd(draw(1), group));
entry_ir.SetVectorReg(
static_cast<IR::VectorReg>(6),
entry_ir.IAdd(draw(2), builtin(IR::StageInputKind::WorkgroupId, 1)));
entry_ir.SetVectorReg(static_cast<IR::VectorReg>(6),
builtin(IR::StageInputKind::WorkgroupId, 1));
} else {
// GS adjacency addresses local ES records in LDS. Fans retain the draw's
// center in every subgroup; strip winding follows the global primitive.
@@ -1277,14 +1277,14 @@ IR::Program TranslateProgram(const Decoder::Program& decoded, const CFG::Graph&
entry_ir.ShiftLeftLogical(second, u32(18))));
entry_ir.SetVectorReg(static_cast<IR::VectorReg>(1),
entry_ir.ShiftLeftLogical(third, u32(2)));
const auto index_bytes = draw(3);
const auto index_bytes = draw(2);
const auto indexed = entry_ir.INotEqual(index_bytes, u32(0));
const auto index_low = draw(4);
const auto index_low = draw(3);
const auto byte_offset = entry_ir.IAdd(entry_ir.BitwiseAnd(index_low, u32(3)),
entry_ir.IMul(input_vertex, index_bytes));
const auto index_resource = entry_ir.Emit(
IR::ValueOpcode::GetAddressResource,
{entry_ir.BitwiseAnd(index_low, u32(~3u)), draw(5)});
{entry_ir.BitwiseAnd(index_low, u32(~3u)), draw(4)});
const auto memory_index = static_cast<uint32_t>(result.memory_info.size());
result.memory_info.push_back({.kind = IR::ResourceKind::Global});
const auto packed_index = entry_ir.Emit(
@@ -1298,9 +1298,8 @@ IR::Program TranslateProgram(const Decoder::Program& decoded, const CFG::Graph&
entry_ir.IMul(index_bytes, u32(8))}));
entry_ir.SetVectorReg(static_cast<IR::VectorReg>(5),
entry_ir.IAdd(draw(1), entry_ir.Select(indexed, index, input_vertex)));
entry_ir.SetVectorReg(
static_cast<IR::VectorReg>(8),
entry_ir.IAdd(draw(2), builtin(IR::StageInputKind::WorkgroupId, 1)));
entry_ir.SetVectorReg(static_cast<IR::VectorReg>(8),
builtin(IR::StageInputKind::WorkgroupId, 1));
}
} else if (options.stage == ShaderType::Local) {
entry_ir.SetScalarReg(static_cast<IR::ScalarReg>(3), IR::U32(IR::Value(64u)));
src/graphics/shader/recompiler/ir/ShaderIR.h
+1 -1
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@@ -365,7 +365,7 @@ static_assert(static_cast<uint32_t>(DescriptorBindingKind::Count) == 58u);
struct PushData {
static constexpr uint32_t DwordCount = 32;
static constexpr uint32_t MeshDrawDwordCount = 6;
static constexpr uint32_t MeshDrawDwordCount = 5;
static constexpr uint32_t NoStart = UINT32_MAX;
std::array<uint32_t, DwordCount> dwords {};