From: Mikko Rasa <tdb@tdb.fi>
Date: Tue, 23 Jun 2020 14:11:54 +0000 (+0300)
Subject: Normalize fragment normal
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=commitdiff_plain;h=47853d7a557bf81131512832a9e531cb04d273ca

Normalize fragment normal

With some shading models even small deviations, such as result from
the quantization to 8-bit texel component values, may cause visible
artifacts.
---

diff --git a/shaderlib/common.glsl b/shaderlib/common.glsl
index 05648e4c..4a816360 100644
--- a/shaderlib/common.glsl
+++ b/shaderlib/common.glsl
@@ -68,7 +68,7 @@ void main()
 vec3 get_fragment_normal()
 {
 	if(use_normal_map)
-		return texture(normal_map, texcoord.xy).xyz*2.0-1.0;
+		return normalize(texture(normal_map, texcoord.xy).xyz*2.0-1.0);
 	else
 		return vec3(0.0, 0.0, 1.0);
 }