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gpu: implement PA_CL_UCP user clip planes through draw push constants

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This commit is contained in:
Mr. Big Britches
2026-10-20 07:00:55 +02:00
committed by nmzik
parent 18e6747dbf
commit feed075a9f
11 changed files with 109 additions and 45 deletions
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterModule.cpp
+15 -5
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@@ -244,7 +244,7 @@ void DefineDescriptors(EmitterState& state) {
counts[static_cast<size_t>(Kind::ShaderData)] =
bindings.ShaderDataDwords() != 0 && !bindings.UsesPushData();
if (state.program.bindings.UsesPushData() || state.program.stage == ShaderType::Mesh ||
state.object_primitive_id_variable != 0) {
state.object_primitive_id_variable != 0 || state.user_clip_planes != 0) {
const auto type = PushConstantBlockType(state);
state.push_constant_variable = state.builder.DefineGlobalVariable(
TypePointer(state, spv::StorageClassPushConstant, type), spv::StorageClassPushConstant);
@@ -600,14 +600,24 @@ void DefineOutputs(EmitterState& state) {
cull_distance_count = std::max(cull_distance_count, output.index + 1);
}
}
const bool position = std::ranges::any_of(state.outputs, [](const OutputBinding& output) {
return output.kind == IR::StageOutputKind::Position;
});
if (position && state.input_info.vertex->user_clip_planes != 0) {
// PipelineCache rejects UCP_ENA with shader clip or cull distances.
EXIT_IF(clip_distance_count + cull_distance_count != 0);
state.user_clip_planes = state.input_info.vertex->user_clip_planes;
for (auto mask = state.user_clip_planes; mask != 0; mask &= mask - 1u) {
state.outputs.push_back(
{{IR::StageOutputKind::ClipDistance, clip_distance_count++, 0, "gl_ClipDistance"}});
}
}
if (state.program.stage == ShaderType::Mesh) {
DefineMeshOutputs(state, clip_distance_count, cull_distance_count);
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;
})) {
if (state.program.stage == ShaderType::Vertex &&
clip_distance_count + cull_distance_count < 8u && 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,