From d1dd910f1743d579ede07418508688f586b165c2 Mon Sep 17 00:00:00 2001
From: Stenzek <stenzek@gmail.com>
Date: Tue, 27 Dec 2016 12:59:52 +1000
Subject: [PATCH] Vulkan: Clear alpha channel to 0 when pixel format has no
 alpha channel

---
 Source/Core/VideoBackends/Vulkan/Renderer.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Source/Core/VideoBackends/Vulkan/Renderer.cpp b/Source/Core/VideoBackends/Vulkan/Renderer.cpp
index 9c558aa9f9..4097b31ab6 100644
--- a/Source/Core/VideoBackends/Vulkan/Renderer.cpp
+++ b/Source/Core/VideoBackends/Vulkan/Renderer.cpp
@@ -345,9 +345,10 @@ void Renderer::ClearScreen(const EFBRectangle& rc, bool color_enable, bool alpha
       bpmem.zcontrol.pixel_format == PEControl::RGB8_Z24 ||
       bpmem.zcontrol.pixel_format == PEControl::Z24)
   {
-    // Force alpha writes, and set the color to 0xFF.
+    // Force alpha writes, and clear the alpha channel. This is different to the other backends,
+    // where the existing values of the alpha channel are preserved.
     alpha_enable = true;
-    color |= 0xFF000000;
+    color &= 0x00FFFFFF;
   }
 
   // Convert RGBA8 -> floating-point values.