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Support triangle fans in PS5 geometry shaders

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Keep the fan center across subgroups and reuse the existing index fetch.
This commit is contained in:
nmzik
2026-09-16 08:42:47 +04:00
parent 957452d6f9
commit 7c9148dd47
4 changed files with 47 additions and 16 deletions
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src/graphics/shader/recompiler/frontend/translate/Translate.cpp
+20 -14
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@@ -1102,26 +1102,32 @@ 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)));
// GS adjacency addresses local ES records in LDS. Strip winding alternates
// with the global primitive number, including across subgroup boundaries.
const auto parity = mesh.input_primitive ==
static_cast<uint32_t>(Prospero::PrimitiveType::kTriStrip)
? entry_ir.BitwiseAnd(entry_ir.IAdd(primitive_chunk, local), u32(1))
: u32(0);
// GS adjacency addresses local ES records in LDS. Fans retain the draw's
// center in every subgroup; strip winding follows the global primitive.
const auto vertex = entry_ir.IMul(local, step);
const auto first = entry_ir.IAdd(vertex, parity);
const auto second = mesh.InputPrimitiveSize() >= 2u
? entry_ir.ISub(entry_ir.IAdd(vertex, u32(1)), parity)
: u32(0);
const auto third = mesh.InputPrimitiveSize() == 3u
? entry_ir.IAdd(vertex, u32(2))
: u32(0);
auto first = vertex;
auto second = u32(0);
auto third = u32(0);
if (mesh.InputPrimitiveSize() >= 2u) {
second = entry_ir.IAdd(vertex, u32(1));
}
if (mesh.InputPrimitiveSize() == 3u) {
third = entry_ir.IAdd(vertex, u32(2));
}
auto input_vertex = entry_ir.IAdd(chunk, local);
if (mesh.input_primitive == static_cast<uint32_t>(Prospero::PrimitiveType::kTriFan)) {
first = u32(0);
input_vertex = entry_ir.Select(entry_ir.IEqual(local, u32(0)), u32(0), input_vertex);
} else if (mesh.input_primitive == static_cast<uint32_t>(Prospero::PrimitiveType::kTriStrip)) {
const auto parity = entry_ir.BitwiseAnd(entry_ir.IAdd(primitive_chunk, local), u32(1));
first = entry_ir.IAdd(first, parity);
second = entry_ir.ISub(second, parity);
}
entry_ir.SetVectorReg(static_cast<IR::VectorReg>(0),
entry_ir.BitwiseOr(entry_ir.ShiftLeftLogical(first, u32(2)),
entry_ir.ShiftLeftLogical(second, u32(18))));
entry_ir.SetVectorReg(static_cast<IR::VectorReg>(1),
entry_ir.ShiftLeftLogical(third, u32(2)));
const auto input_vertex = entry_ir.IAdd(chunk, local);
const auto index_bytes = draw(3);
const auto indexed = entry_ir.INotEqual(index_bytes, u32(0));
const auto index_low = draw(4);