From c8bbf40bb097db60b3abcbd009d9464097ee0349 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Henrik=20Rydg=C3=A5rd?= <hrydgard@gmail.com>
Date: Sun, 17 Jan 2021 18:04:15 +0100
Subject: [PATCH] GL FB readback: Only use "inout" if we actually want to read
 from the fb.

---
 GPU/Common/FragmentShaderGenerator.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/GPU/Common/FragmentShaderGenerator.cpp b/GPU/Common/FragmentShaderGenerator.cpp
index 3effac63a970..430ed8066956 100644
--- a/GPU/Common/FragmentShaderGenerator.cpp
+++ b/GPU/Common/FragmentShaderGenerator.cpp
@@ -394,7 +394,7 @@ bool GenerateFragmentShader(const FShaderID &id, char *buffer, const ShaderLangu
 
 		if (!strcmp(compat.fragColor0, "fragColor0")) {
 			const char *qualifierColor0 = "out";
-			if (compat.lastFragData && !strcmp(compat.lastFragData, compat.fragColor0)) {
+			if (readFramebuffer && compat.lastFragData && !strcmp(compat.lastFragData, compat.fragColor0)) {
 				qualifierColor0 = "inout";
 			}
 			// Output the output color definitions.