From 51e2e4ef2277f6518f9cf7a46c89b068034788d2 Mon Sep 17 00:00:00 2001
From: taw27 <taw27@84d2e878-0bd5-11dd-ad15-13eda11d74c5>
Date: Wed, 6 Aug 2008 11:57:49 +0000
Subject: Drop back to Blinn-Phong specular lighting

git-svn-id: svn://cook.msm.cam.ac.uk:745/thrust3d/thrust3d@213 84d2e878-0bd5-11dd-ad15-13eda11d74c5
---
 data/shaders/lighting.frag | 18 +++++++-----------
 data/shaders/lighting.vert | 13 +++++++------
 2 files changed, 14 insertions(+), 17 deletions(-)

diff --git a/data/shaders/lighting.frag b/data/shaders/lighting.frag
index a9febe4..d4cb035 100644
--- a/data/shaders/lighting.frag
+++ b/data/shaders/lighting.frag
@@ -9,18 +9,17 @@
  *
  */
 
-varying vec3 pos;
 varying vec3 normal;
+varying vec3 col_ambi_diff;
+varying vec3 col_emit;
 
 varying vec3 light0vc;
+varying vec3 light0half;
 varying float light0dist;
 
 varying vec3 light1vc;
 varying vec3 light2vc;
 
-varying vec3 col_ambi_diff;
-varying vec3 col_emit;
-
 uniform sampler2D texture;
 uniform sampler2D normalmap;
 
@@ -63,7 +62,6 @@ void main() {
 		/* Light 0: Lander craft's spotlight */
 		float falloff, spot;
 		float diff_fac, spec_fac;
-		vec3 E, R;
 		
 		falloff = 1/ (  gl_LightSource[0].constantAttenuation
 			            + gl_LightSource[0].linearAttenuation * light0dist
@@ -75,14 +73,12 @@ void main() {
 		diff_fac = max(0.0, dot(norm, normalize(light0vc)));
 		diff += col_ambi_diff * gl_LightSource[0].diffuse.rgb * spot * falloff * diff_fac;
 		
-		E = normalize(-pos);
-		R = normalize(-reflect(light0vc, norm)); 
-		spec_fac = pow(max(0.0, dot(R, E)), 80.0);
-		spec += vec3(1.0, 1.0, 1.0) * gl_LightSource[0].specular.rgb * spot * falloff * spec_fac;
+		//spec_fac = pow(max(0.0, dot(normalize(light0half), norm)), 80.0);
+		//spec += vec3(1.0, 1.0, 1.0) * gl_LightSource[0].specular.rgb * spot * falloff * spec_fac;
 		
 		/* Light 1: Background glow */
-		diff += col_ambi_diff * gl_LightSource[1].diffuse.rgb * max(0.0, dot(vec3(light1vc), norm));
-
+		diff += col_ambi_diff * gl_LightSource[1].diffuse.rgb * max(0.0, dot(light1vc, norm));
+		
 	}
 	
 	if ( texture_enabled ) {
diff --git a/data/shaders/lighting.vert b/data/shaders/lighting.vert
index 0178530..99e9b37 100644
--- a/data/shaders/lighting.vert
+++ b/data/shaders/lighting.vert
@@ -9,20 +9,19 @@
  *
  */
 
-varying vec3 pos;
 varying vec3 normal;
+varying vec3 col_ambi_diff;
+varying vec3 col_emit;
 
 varying vec3 light0vc;
+varying vec3 light0half;
 varying float light0dist;
 
 varying vec3 light1vc;
 varying vec3 light2vc;
 
-varying vec3 col_ambi_diff;
-varying vec3 col_emit;
-
 vec3 v4conv3(vec4 a) {
-	vec4 div = a/a.w;
+	vec4 div = a/(a.w);
 	return div.xyz;
 }
 
@@ -30,15 +29,17 @@ void main() {
 	
 	vec4 vert;
 	vec3 vert_to_light;
+	vec3 vert_to_eye;
 	
 	vert = gl_ModelViewMatrix * gl_Vertex;
-	pos = v4conv3(vert);
 	normal = gl_NormalMatrix * gl_Normal;
 	
 	/* Spotlight - positional light */
 	vert_to_light = v4conv3(gl_LightSource[0].position - vert);
 	light0dist = length(vert_to_light);
 	light0vc = normalize(vert_to_light);
+	vert_to_eye = v4conv3(-vert);
+	light0half = normalize(vert_to_eye + vert_to_light);
 	
 	/* Diffuse "background glow" - this can be normalised only once, here, since 'position'
 	 * is really 'direction' and is the same for all vertices. */
-- 
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