From 6c51f496320f698e123207c09ca61e55180a31b5 Mon Sep 17 00:00:00 2001
From: ameerj <52414509+ameerj@users.noreply.github.com>
Date: Sun, 28 Mar 2021 22:23:45 -0400
Subject: shader: Implement FSWZADD

---
 src/shader_recompiler/backend/spirv/emit_context.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'src/shader_recompiler/backend/spirv/emit_context.cpp')

diff --git a/src/shader_recompiler/backend/spirv/emit_context.cpp b/src/shader_recompiler/backend/spirv/emit_context.cpp
index 96d0e9b4d..7531f8b21 100644
--- a/src/shader_recompiler/backend/spirv/emit_context.cpp
+++ b/src/shader_recompiler/backend/spirv/emit_context.cpp
@@ -393,6 +393,14 @@ void EmitContext::DefineInputs(const Info& info) {
         subgroup_local_invocation_id =
             DefineInput(*this, U32[1], spv::BuiltIn::SubgroupLocalInvocationId);
     }
+    if (info.uses_fswzadd) {
+        const Id f32_one{Constant(F32[1], 1.0f)};
+        const Id f32_minus_one{Constant(F32[1], -1.0f)};
+        const Id f32_zero{Constant(F32[1], 0.0f)};
+        fswzadd_lut_a = ConstantComposite(F32[4], f32_minus_one, f32_one, f32_minus_one, f32_zero);
+        fswzadd_lut_b =
+            ConstantComposite(F32[4], f32_minus_one, f32_minus_one, f32_one, f32_minus_one);
+    }
     if (info.loads_position) {
         const bool is_fragment{stage != Stage::Fragment};
         const spv::BuiltIn built_in{is_fragment ? spv::BuiltIn::Position : spv::BuiltIn::FragCoord};
-- 
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