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Cull zero homogeneous vertex positions before rasterization

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Fix Playroom top right artifact on Nvidia by clipping zero-position vertices.
This commit is contained in:
nmzik
2026-09-15 09:50:12 +04:00
parent a1fbc41146
commit 86414760e6
8 changed files with 135 additions and 17 deletions
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterModule.cpp
+9
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@@ -476,6 +476,15 @@ void DefineOutputs(EmitterState& state) {
DefineMeshOutputs(state);
return;
}
if (state.program.stage == ShaderType::Vertex && clip_distance_count + cull_distance_count < 8u &&
std::ranges::any_of(state.outputs, [](const OutputBinding& output) {
return output.kind == IR::StageOutputKind::Position;
})) {
// Reserve one plane for the enabled PA_CL_CLIP_CNTL clipping-error cull.
state.invalid_position_clip_distance = clip_distance_count++;
state.outputs.push_back({{IR::StageOutputKind::ClipDistance,
state.invalid_position_clip_distance, 0, "gl_ClipDistance"}});
}
const auto BuiltIn = [&](uint32_t& variable, uint32_t type, const char* name,
spv::BuiltIn builtin) {
if (variable == 0) {