From 0622979d3b1761cfec6108ddb4b77d67518986f3 Mon Sep 17 00:00:00 2001
From: Stenzek <stenzek@gmail.com>
Date: Sun, 3 Sep 2017 16:32:37 +1000
Subject: ShaderGen: Support writing integer colors when logic op is enabled

This is required for D3D to support logic op.
---
 Source/Core/VideoCommon/BPMemory.cpp | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'Source/Core/VideoCommon/BPMemory.cpp')

diff --git a/Source/Core/VideoCommon/BPMemory.cpp b/Source/Core/VideoCommon/BPMemory.cpp
index 26891ba941..8c0a2ec43a 100644
--- a/Source/Core/VideoCommon/BPMemory.cpp
+++ b/Source/Core/VideoCommon/BPMemory.cpp
@@ -10,6 +10,19 @@
 // STATE_TO_SAVE
 BPMemory bpmem;
 
+bool BlendMode::UseLogicOp() const
+{
+  // Logicop bit has lowest priority.
+  if (subtract || blendenable || !logicopenable)
+    return false;
+
+  // Fast path for Kirby's Return to Dreamland, they use it with dstAlpha.
+  if (logicmode == BlendMode::NOOP)
+    return false;
+
+  return true;
+}
+
 float FogParam0::GetA() const
 {
   // scale mantissa from 11 to 23 bits
-- 
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