From 53d3f49f45fc6a6703ae4c6522bac2284b024ac8 Mon Sep 17 00:00:00 2001
From: kd-11 <karokidii@gmail.com>
Date: Mon, 16 Mar 2026 01:58:03 +0300
Subject: [PATCH] overlays/gl: Fix misbehaving clip regions

---
 .../Program/GLSLSnippets/OverlayRenderVS.glsl  | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/rpcs3/Emu/RSX/Program/GLSLSnippets/OverlayRenderVS.glsl b/rpcs3/Emu/RSX/Program/GLSLSnippets/OverlayRenderVS.glsl
index c583627251..46768d68a2 100644
--- a/rpcs3/Emu/RSX/Program/GLSLSnippets/OverlayRenderVS.glsl
+++ b/rpcs3/Emu/RSX/Program/GLSLSnippets/OverlayRenderVS.glsl
@@ -66,13 +66,29 @@ vec4 ndc_to_window(const in vec4 coord)
 	return fma(coord, viewport.xyxy, viewport.zwzw);
 }
 
+vec4 make_aabb(const in vec4 coords)
+{
+	// AABB requires the intersections to be concave
+	// i.e X1 < X2 and Y1 < Y2
+	vec4 result = coords;
+	if (coords.x > coords.z)
+	{
+		result.xz = coords.zx;
+	}
+	if (coords.y > coords.w)
+	{
+		result.yw = coords.wy;
+	}
+	return result;
+}
+
 void main()
 {
 	config_t config = unpack_vertex_options();
 
 	tc0.xy = in_pos.zw;
 	color = albedo;
-	clip_rect = ndc_to_window(clip_to_ndc(clip_bounds, config.flip_vertically));
+	clip_rect = make_aabb(ndc_to_window(clip_to_ndc(clip_bounds, config.flip_vertically)));
 
 	vec4 pos = vec4(clip_to_ndc(in_pos, config.flip_vertically).xy, 0.5, 1.);