From d12a8e09a855d49e1e475216f26e9a59f8852f56 Mon Sep 17 00:00:00 2001
From: Philip Rebohle <philip.rebohle@tu-dortmund.de>
Date: Sat, 23 Feb 2019 14:33:59 +0100
Subject: [PATCH] [dxbc] Decorate integer fragment shader builtins as flat

Fixes yellow tint in Unreal Engine 4 games on RADV and AMDGPU-PRO.
---
 src/dxbc/dxbc_compiler.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/dxbc/dxbc_compiler.cpp b/src/dxbc/dxbc_compiler.cpp
index 11569842..9b3973a3 100644
--- a/src/dxbc/dxbc_compiler.cpp
+++ b/src/dxbc/dxbc_compiler.cpp
@@ -7098,8 +7098,14 @@ namespace dxvk {
     const char*             name) {
     const uint32_t varId = emitNewVariable(info);
     
-    m_module.decorateBuiltIn(varId, builtIn);
     m_module.setDebugName(varId, name);
+    m_module.decorateBuiltIn(varId, builtIn);
+
+    if (m_programInfo.type() == DxbcProgramType::PixelShader
+     && info.type.ctype != DxbcScalarType::Float32
+     && info.type.ctype != DxbcScalarType::Bool
+     && info.sclass == spv::StorageClassInput)
+      m_module.decorate(varId, spv::DecorationFlat);
     
     m_entryPointInterfaces.push_back(varId);
     return varId;