X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=shaderlib%2Fcommon.glsl;h=557d4d76a17cff24ef538946d8d95e531d5c099d;hb=2729c824049bd59c16370a60a90824a416755a62;hp=7a57b0671eebf1a3b4850cb451785c66a52498ff;hpb=139924448ef4753b3942da07091a2630a037c034;p=libs%2Fgl.git

diff --git a/shaderlib/common.glsl b/shaderlib/common.glsl
index 7a57b067..557d4d76 100644
--- a/shaderlib/common.glsl
+++ b/shaderlib/common.glsl
@@ -78,10 +78,12 @@ layout(location=0) out vec4 frag_color;
 
 virtual vec3 get_fragment_normal()
 {
+	vec3 normal;
+	float sgn = (gl_FrontFacing ? 1.0 : -1.0);
 	if(use_normal_map)
-		return normalize(world_tbn_matrix*(texture(normal_map, texcoord.xy).xyz*2.0-1.0));
+		return sgn*normalize(world_tbn_matrix*(texture(normal_map, texcoord.xy).xyz*2.0-1.0));
 	else
-		return normalize(world_normal);
+		return sgn*normalize(world_normal);
 }
 
 virtual IncomingLight get_incoming_light(int index, vec3 world_pos)