From a0b70225f13afa534e6dbea37e46c2f46065a80f 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: Revert shaders to a previous working version

git-svn-id: svn://cook.msm.cam.ac.uk:745/thrust3d/thrust3d@215 84d2e878-0bd5-11dd-ad15-13eda11d74c5
---
 data/shaders/lighting.frag | 50 ++++++++++++++++++++++++----------------------
 data/shaders/lighting.vert | 34 ++++++++++---------------------
 2 files changed, 37 insertions(+), 47 deletions(-)

diff --git a/data/shaders/lighting.frag b/data/shaders/lighting.frag
index 6e3fe65..1bc0afd 100644
--- a/data/shaders/lighting.frag
+++ b/data/shaders/lighting.frag
@@ -10,15 +10,12 @@
  */
 
 varying vec3 normal;
-varying vec3 col_ambi_diff;
-varying vec3 col_emit;
 
 varying vec3 light0vc;
-varying vec3 light0half;
-varying float light0dist;
-
+varying vec3 light0hvc;
 varying vec3 light1vc;
 varying vec3 light2vc;
+varying vec3 light2hvc;
 
 uniform sampler2D texture;
 uniform sampler2D normalmap;
@@ -29,6 +26,9 @@ uniform bool texture_enabled;
 uniform bool texture_emits;
 uniform float alpha;
 
+varying vec3 col_ambi_diff;
+varying vec3 col_emit;
+
 void main() {
 	
 	vec3 ambi;
@@ -48,37 +48,39 @@ void main() {
 	
 	/* Emission */
 	emit = col_emit;
-	
-	if ( fill_light_enabled ) {
 		
-		/* Light 2: Fill-in light for lander */
-		float diff_fac, spec_fac;
+	/* Fill-in light (light 2) */
+	if ( fill_light_enabled ) {
 		
-		diff_fac = max(dot(norm, normalize(light2vc)), 0.0);
-		diff += col_ambi_diff * gl_LightSource[2].diffuse.rgb * diff_fac;
+		float ndothv;
 		
+		ndothv = max(dot(norm, normalize(light2hvc)), 0.0);
+		diff += col_ambi_diff * gl_LightSource[2].diffuse.rgb * max(dot(vec3(light1vc), norm), 0.0);
+		spec += gl_LightSource[2].specular.rgb * pow(ndothv, 80.0);
+
 	} else {
 	
-		/* Light 0: Lander craft's spotlight */
-		float falloff, spot;
-		float diff_fac, spec_fac;
-		
-		falloff = 1.0 / (  gl_LightSource[0].constantAttenuation
-				 + gl_LightSource[0].linearAttenuation * light0dist
-				 + gl_LightSource[0].quadraticAttenuation * light0dist * light0dist );
+		/* Spotlight (light 0) - positional, spotlight */
+		float falloff;
+		float spot;
+		float ndothv;
 		
+		falloff = 1/ (  gl_LightSource[0].constantAttenuation
+			            + gl_LightSource[0].linearAttenuation * length(light0vc)
+			            + gl_LightSource[0].quadraticAttenuation * pow(length(light0vc), 2.0) );
 		spot = max(dot(normalize(-light0vc), gl_LightSource[0].spotDirection), 0.0);
 		spot = pow(spot, gl_LightSource[0].spotExponent);
 		
-		diff_fac = max(0.0, dot(norm, normalize(light0vc)));
-		diff += col_ambi_diff * gl_LightSource[0].diffuse.rgb * spot * falloff * diff_fac;
+		ndothv = max(dot(norm, normalize(light0hvc)), 0.0);
 		
-		//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;
+		diff += col_ambi_diff * gl_LightSource[0].diffuse.rgb * spot * falloff *
+									max(dot(normalize(light0vc).xyz, norm), 0.0);
 		
-		/* Light 1: Background glow */
-		diff += col_ambi_diff * gl_LightSource[1].diffuse.rgb * max(0.0, dot(light1vc, norm));
+		spec += vec3(1.0, 1.0, 1.0) * gl_LightSource[0].specular.rgb * spot * falloff * pow(ndothv, 80.0);
 		
+		/* Background glow (light 1) - diffuse only, directional */
+		diff += col_ambi_diff * gl_LightSource[1].diffuse.rgb * max(dot(vec3(light1vc), norm), 0.0);
+
 	}
 	
 	if ( texture_enabled ) {
diff --git a/data/shaders/lighting.vert b/data/shaders/lighting.vert
index af80574..914d6ac 100644
--- a/data/shaders/lighting.vert
+++ b/data/shaders/lighting.vert
@@ -10,45 +10,33 @@
  */
 
 varying vec3 normal;
-varying vec3 col_ambi_diff;
-varying vec3 col_emit;
 
 varying vec3 light0vc;
-varying vec3 light0half;
-varying float light0dist;
-
+varying vec3 light0hvc;
 varying vec3 light1vc;
 varying vec3 light2vc;
+varying vec3 light2hvc;
 
-vec3 v4conv3(vec4 a) {
-	vec4 div = a/(a.w);
-	return div.xyz;
-}
+varying vec3 col_ambi_diff;
+varying vec3 col_emit;
 
 void main() {
 	
-	vec4 vert;
-	vec3 vert_to_light;
-	vec3 vert_to_eye;
-	
-	vert = gl_ModelViewMatrix * gl_Vertex;
-	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(normalize(vert_to_eye) + light0vc);
+	vec4 vert = gl_ModelViewMatrix * gl_Vertex;
+	light0vc = gl_LightSource[0].position.xyz - vert.xyz;
+	light0hvc = vec3(gl_LightSource[0].halfVector - vert);
 	
 	/* Diffuse "background glow" - this can be normalised only once, here, since 'position'
 	 * is really 'direction' and is the same for all vertices. */
-	light1vc = normalize(v4conv3(gl_LightSource[1].position));
+	light1vc = normalize(vec3(gl_LightSource[1].position));
 	
 	/* Fill-in light */
-	light2vc = normalize(v4conv3(gl_LightSource[2].position));
+	light2vc = normalize(vec3(gl_LightSource[2].position));
+	light2hvc = normalize(vec3(gl_LightSource[2].halfVector - vert));
 	
 	/* Material properties */
+	normal = gl_NormalMatrix * gl_Normal;
 	col_ambi_diff = gl_Color.rgb;
 	col_emit = gl_FrontMaterial.emission.rgb;
 	
-- 
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