X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=shaderlib%2Fcommon.glsl;h=33fefe8806deb4ddfa7240c5394f1778f082d1c1;hb=c8520aa336e92f2eaf9a38c3430c608520a90324;hp=dde09c12cff45bca1a4a60fe95d6a37305404ef8;hpb=a2b0d155023ca23afe7848ae5d17e0f7bc328525;p=libs%2Fgl.git

diff --git a/shaderlib/common.glsl b/shaderlib/common.glsl
index dde09c12..33fefe88 100644
--- a/shaderlib/common.glsl
+++ b/shaderlib/common.glsl
@@ -71,6 +71,12 @@ void main()
 }
 
 #pragma MSP stage(fragment)
+struct IncomingLight
+{
+	vec3 direction;
+	vec3 color;
+};
+
 virtual vec3 get_fragment_normal()
 {
 	if(use_normal_map)
@@ -79,10 +85,13 @@ virtual vec3 get_fragment_normal()
 		return normalize(world_normal);
 }
 
-virtual vec3 get_light_direction(int index)
+virtual IncomingLight get_incoming_light(int index, vec3 world_pos)
 {
 	vec4 light_pos = light_sources[index].position;
-	return normalize(light_pos.xyz-world_vertex.xyz*light_pos.w);
+	vec3 rel_pos = light_pos.xyz-world_pos*light_pos.w;
+	float d = length(rel_pos);
+	float attenuation = 1.0/dot(vec3(1.0, d, d*d), light_sources[index].attenuation);
+	return IncomingLight(rel_pos/d, light_sources[index].color*attenuation);
 }
 
 virtual vec3 get_environment_sample(vec3 direction, float roughness)