4 files changed, 18 insertions, 0 deletions

diff --git a/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp b/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp
index a4751b42d..5b3b5d1f3 100644
--- a/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp
+++ b/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp
@@ -512,6 +512,18 @@ Id EmitInvocationId(EmitContext& ctx) {
     return ctx.OpLoad(ctx.U32[1], ctx.invocation_id);
 }
 
+Id EmitInvocationInfo(EmitContext& ctx) {
+    switch (ctx.stage) {
+    case Stage::TessellationControl:
+    case Stage::TessellationEval:
+        return ctx.OpShiftLeftLogical(ctx.U32[1], ctx.OpLoad(ctx.U32[1], ctx.patch_vertices_in),
+                                      ctx.Const(16u));
+    default:
+        LOG_WARNING(Shader, "(STUBBED) called");
+        return ctx.Const(0x00ff0000u);
+    }
+}
+
 Id EmitSampleId(EmitContext& ctx) {
     return ctx.OpLoad(ctx.U32[1], ctx.sample_id);
 }
diff --git a/src/shader_recompiler/backend/spirv/emit_spirv_instructions.h b/src/shader_recompiler/backend/spirv/emit_spirv_instructions.h
index 7070c8fda..e31cdc5e8 100644
--- a/src/shader_recompiler/backend/spirv/emit_spirv_instructions.h
+++ b/src/shader_recompiler/backend/spirv/emit_spirv_instructions.h
@@ -72,6 +72,7 @@ void EmitSetOFlag(EmitContext& ctx);
 Id EmitWorkgroupId(EmitContext& ctx);
 Id EmitLocalInvocationId(EmitContext& ctx);
 Id EmitInvocationId(EmitContext& ctx);
+Id EmitInvocationInfo(EmitContext& ctx);
 Id EmitSampleId(EmitContext& ctx);
 Id EmitIsHelperInvocation(EmitContext& ctx);
 Id EmitYDirection(EmitContext& ctx);
diff --git a/src/shader_recompiler/backend/spirv/spirv_emit_context.cpp b/src/shader_recompiler/backend/spirv/spirv_emit_context.cpp
index c26ad8f93..0bfc2dd89 100644
--- a/src/shader_recompiler/backend/spirv/spirv_emit_context.cpp
+++ b/src/shader_recompiler/backend/spirv/spirv_emit_context.cpp
@@ -1325,6 +1325,10 @@ void EmitContext::DefineInputs(const IR::Program& program) {
     if (info.uses_invocation_id) {
         invocation_id = DefineInput(*this, U32[1], false, spv::BuiltIn::InvocationId);
     }
+    if (info.uses_invocation_info &&
+        (stage == Shader::Stage::TessellationControl || stage == Shader::Stage::TessellationEval)) {
+        patch_vertices_in = DefineInput(*this, U32[1], false, spv::BuiltIn::PatchVertices);
+    }
     if (info.uses_sample_id) {
         sample_id = DefineInput(*this, U32[1], false, spv::BuiltIn::SampleId);
     }
diff --git a/src/shader_recompiler/backend/spirv/spirv_emit_context.h b/src/shader_recompiler/backend/spirv/spirv_emit_context.h
index c86e50911..dde45b4bc 100644
--- a/src/shader_recompiler/backend/spirv/spirv_emit_context.h
+++ b/src/shader_recompiler/backend/spirv/spirv_emit_context.h
@@ -204,6 +204,7 @@ public:
     Id workgroup_id{};
     Id local_invocation_id{};
     Id invocation_id{};
+    Id patch_vertices_in{};
     Id sample_id{};
     Id is_helper_invocation{};
     Id subgroup_local_invocation_id{};