From: Mikko Rasa <tdb@tdb.fi>
Date: Wed, 17 Nov 2021 13:46:19 +0000 (+0200)
Subject: Hide the use of the tangent variable in common.glsl behind an if
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=commitdiff_plain;h=0f256116c84a5b926bc923f5bbad95622933517a

Hide the use of the tangent variable in common.glsl behind an if
---

diff --git a/shaderlib/common.glsl b/shaderlib/common.glsl
index 481d86c4..35d5a87e 100644
--- a/shaderlib/common.glsl
+++ b/shaderlib/common.glsl
@@ -43,9 +43,12 @@ void standard_transform()
 	gl_Position = clip_eye_matrix*eye_vertex;
 
 	out vec3 world_normal = normal_tf*get_vertex_normal();
-	vec3 world_tangent = normal_tf*tangent;
-	vec3 world_binormal = cross(world_normal, world_tangent);
-	out mat3 world_tbn_matrix = mat3(world_tangent, world_binormal, world_normal);
+	if(use_normal_map)
+	{
+		vec3 world_tangent = normal_tf*tangent;
+		vec3 world_binormal = cross(world_normal, world_tangent);
+		out mat3 world_tbn_matrix = mat3(world_tangent, world_binormal, world_normal);
+	}
 
 	vec3 eye_pos = world_eye_matrix[3].xyz;
 	out vec3 world_look_dir = normalize(world_vertex.xyz-eye_pos);