From befb3ca31b28e70cbf5d48534dfed916410bfd6b Mon Sep 17 00:00:00 2001
From: Bill Currie <bill@taniwha.org>
Date: Sat, 22 Jul 2023 00:43:05 +0900
Subject: [PATCH] [vulkan] Clamp composed values to >= 0

This takes care of the nans that got into the output buffer resulting is
weird holes in any overlays.
---
 libs/video/renderer/vulkan/shader/compose.frag | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libs/video/renderer/vulkan/shader/compose.frag b/libs/video/renderer/vulkan/shader/compose.frag
index 8a4064a62..441b9c9d9 100644
--- a/libs/video/renderer/vulkan/shader/compose.frag
+++ b/libs/video/renderer/vulkan/shader/compose.frag
@@ -22,7 +22,7 @@ main (void)
 	c = subpassLoad (color).rgb;
 	l = subpassLoad (light).rgb;
 	e = subpassLoad (emission).rgb;
-	o = BlendFrags (vec4 (c * l + e, 1)).xyz;
+	o = max(BlendFrags (vec4 (c * l + e, 1)).xyz, vec3(0));
 	o = pow (o, vec3(0.83));//FIXME make gamma correction configurable
 	frag_color = vec4 (o, 1);
 }