From 87c549ffaecb675991c9aed5358466a62e151a83 Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Fri, 31 May 2013 21:28:13 +0200
Subject: [PATCH] gl_video: explicitly clamp colormatrix output

This could lead to quite visible artifacts when using an appropriate ICC
and float FBOs. The float FBOs allow storing out of range values, and my
guess is that the rest of the precessing chain elevated these out of
range values, resulting in artifacts.
---
 video/out/gl_video_shaders.glsl | 1 +
 1 file changed, 1 insertion(+)

diff --git a/video/out/gl_video_shaders.glsl b/video/out/gl_video_shaders.glsl
index 53524e6cbb..47be240571 100644
--- a/video/out/gl_video_shaders.glsl
+++ b/video/out/gl_video_shaders.glsl
@@ -358,6 +358,7 @@ void main() {
 #endif
 #ifdef USE_COLORMATRIX
     color = mat3(colormatrix) * color + colormatrix[3];
+    color = clamp(color, 0, 1);
 #endif
 #ifdef USE_CONV_GAMMA
     color = pow(color, vec3(conv_gamma));