From 7da0822419db57700acfcb9bcb000955d591b979 Mon Sep 17 00:00:00 2001
From: kd-11 <karokidii@gmail.com>
Date: Sun, 12 Jan 2025 15:51:15 +0300
Subject: [PATCH] rsx/shaders: Fix MSAA coords wrapping when input is negative

---
 .../GLSLSnippets/RSXProg/RSXFragmentTextureMSAAOps.glsl        | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/rpcs3/Emu/RSX/Program/GLSLSnippets/RSXProg/RSXFragmentTextureMSAAOps.glsl b/rpcs3/Emu/RSX/Program/GLSLSnippets/RSXProg/RSXFragmentTextureMSAAOps.glsl
index d250e2efb4..8575508f54 100644
--- a/rpcs3/Emu/RSX/Program/GLSLSnippets/RSXProg/RSXFragmentTextureMSAAOps.glsl
+++ b/rpcs3/Emu/RSX/Program/GLSLSnippets/RSXProg/RSXFragmentTextureMSAAOps.glsl
@@ -34,7 +34,8 @@ vec2 texture2DMSCoord(const in vec2 coords, const in uint flags)
 		return coords;
 	}
 
-	const vec2 wrapped_coords = mod(coords, vec2(1.0));
+	const vec2 wrapped_coords_raw = mod(coords, vec2(1.0));
+	const vec2 wrapped_coords = mod(wrapped_coords_raw + vec2(1.0), vec2(1.0));
 	const bvec2 wrap_control_mask = bvec2(uvec2(flags) & uvec2(WRAP_S_MASK, WRAP_T_MASK));
 	return _select(coords, wrapped_coords, wrap_control_mask);
 }