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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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tests/shaderCfgTests.cpp
+21
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@@ -9606,6 +9606,15 @@ void TestMergedShaderUserDataSnapshot() {
params.user_data.begin() + 8),
"monolithic NGG shader used stale GS-back state or lost its s8 user data");
}
context.SetMaxOutputPerSubgroup(256);
context.SetGsMaxVertOut(8);
user_config.SetPrimitiveType(Prospero::PrimitiveType::kTriFan);
user_config.SetGeControl({32, 32});
ShaderVertexInputInfo fan_input{};
PrepareProgram(regs, context, user_config, fan_input);
Check(fan_input.mesh.primitives_per_group == 30 && fan_input.mesh.vertices_per_group == 32 &&
fan_input.mesh.max_vertices == 256 && fan_input.mesh.max_primitives == 192,
"captured triangle-fan GS configuration lost its subgroup assembly limits");
}
void TestEmbeddedFetchPreservesSharedScalarLoad() {
@@ -9791,6 +9800,18 @@ void TestMeshInputAssembly() {
0x40000305, 1, 2, 3, 0, 15, false},
{Prospero::PrimitiveType::kTriStrip, 5, 8, 0, 1, 0, 0, 11,
0x40000305, 2, 1, 3, 0, 12, false},
{Prospero::PrimitiveType::kTriFan, 32, 6, 0, 3, 2, 0x1002, 0,
0x40000406, 0, 4, 5, 8, 0x0123, true},
{Prospero::PrimitiveType::kTriFan, 5, 8, 1, 0, 2, 0x1002, 0,
0x40000305, 0, 1, 2, 0, 0xabcd, true},
{Prospero::PrimitiveType::kTriFan, 5, 8, 1, 1, 0, 0, 11,
0x40000305, 0, 2, 3, 0, 15, false},
{Prospero::PrimitiveType::kTriFan, 5, 7, 1, 3, 2, 0x1002, 11,
0x40000204, 0, 4, 5, 12, 0xabd8, true},
{Prospero::PrimitiveType::kTriFan, 5, 7, 1, 4, 2, 0x1002, 0,
0x40000204, 0, 5, 6, 16, 0, false},
{Prospero::PrimitiveType::kTriFan, 5, 8, 1, 64, 4, 0x1000, 0,
0x41000000, 0, 65, 66, 268, 0, false},
{Prospero::PrimitiveType::kLineList, 5, 17, 3, 0, 0, 0, 11,
0x40000204, 0, 1, 0, 0, 23, false},
{Prospero::PrimitiveType::kLineList, 6, 17, 2, 4, 2, 0x1002, 11,