From a655a74010577609339013065eecdb9024f0aa1b Mon Sep 17 00:00:00 2001
From: taw27 <taw27@84d2e878-0bd5-11dd-ad15-13eda11d74c5>
Date: Wed, 6 Aug 2008 11:57:50 +0000
Subject: Moving things around

git-svn-id: svn://cook.msm.cam.ac.uk:745/thrust3d/thrust3d@217 84d2e878-0bd5-11dd-ad15-13eda11d74c5
---
 data/shaders/lighting.frag | 35 ++++++++++++++++++++++-------------
 data/shaders/lighting.vert | 11 +++--------
 2 files changed, 25 insertions(+), 21 deletions(-)

(limited to 'data')

diff --git a/data/shaders/lighting.frag b/data/shaders/lighting.frag
index 39caf72..7ec0d3e 100644
--- a/data/shaders/lighting.frag
+++ b/data/shaders/lighting.frag
@@ -50,41 +50,50 @@ void main() {
 	/* Emission */
 	emit = col_emit;
 		
-	/* Fill-in light (light 2) */
 	if ( fill_light_enabled ) {
 		
-		float ndothv;
+		float diff_fac, spec_fac;
+		vec3 L, E, R;
+		
+		/* Light 2: Fill-in for lander craft */
+		L = normalize(gl_LightSource[2].position.xyz - pos); 
+		E = normalize(-pos);
+		R = normalize(-reflect(L, norm)); 
+		diff_fac = max(0.0, dot(normalize(light2vc).xyz, norm));
+		spec_fac = max(0.0, dot(R, E));
+		spec_fac = pow(spec_fac, 80.0);
 		
-		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);
+		diff += col_ambi_diff * gl_LightSource[2].diffuse.rgb * diff_fac;
+		spec += gl_LightSource[2].specular.rgb * spec_fac;
 
 	} else {
 	
-		/* Spotlight (light 0) - positional, spotlight */
 		float falloff, spot;
-		float spec_fac;
+		float diff_fac, spec_fac;
 		vec3 L, E, R;
 		
+		/* Light 0: Lander craft's spotlight */
 		falloff = 1.0 / (  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(normalize(light0vc).xyz, norm));
+		
 		L = normalize(gl_LightSource[0].position.xyz - pos); 
 		E = normalize(-pos);
 		R = normalize(-reflect(L, norm)); 
-		
 		spec_fac = max(0.0, dot(R, E));
+		spec_fac = pow(spec_fac, 80.0);
 		
-		diff += col_ambi_diff * gl_LightSource[0].diffuse.rgb * spot * falloff *
-									max(dot(normalize(light0vc).xyz, norm), 0.0);
+		diff += col_ambi_diff * gl_LightSource[0].diffuse.rgb * spot * falloff * diff_fac;
 		
-		spec += vec3(1.0, 1.0, 1.0) * gl_LightSource[0].specular.rgb * spot * falloff * pow(spec_fac, 80.0);
+		spec += vec3(1.0, 1.0, 1.0) * gl_LightSource[0].specular.rgb * spot * falloff * spec_fac;
 		
-		/* Background glow (light 1) - diffuse only, directional */
-		diff += col_ambi_diff * gl_LightSource[1].diffuse.rgb * max(dot(vec3(light1vc), norm), 0.0);
+		/* Light 1: Diffuse background glow */
+		diff += col_ambi_diff * gl_LightSource[1].diffuse.rgb * max(0.0, dot(vec3(light1vc), norm));
 
 	}
 	
diff --git a/data/shaders/lighting.vert b/data/shaders/lighting.vert
index d9306e6..32aa176 100644
--- a/data/shaders/lighting.vert
+++ b/data/shaders/lighting.vert
@@ -13,10 +13,8 @@ varying vec3 pos;
 varying vec3 normal;
 
 varying vec3 light0vc;
-varying vec3 light0half;
 varying vec3 light1vc;
 varying vec3 light2vc;
-varying vec3 light2hvc;
 
 varying vec3 col_ambi_diff;
 varying vec3 col_emit;
@@ -29,17 +27,14 @@ void main() {
 	pos = vert.xyz;
 	normal = gl_NormalMatrix * gl_Normal;
 	
-	/* Spotlight - positional light */
+	/* Light 0: Lander craft's spotlight */
 	light0vc = gl_LightSource[0].position.xyz - vert.xyz;	/* Don't normalise here */
-	light0half = normalize(normalize(light0vc) + normalize(-vert.xyz));
 	
-	/* Diffuse "background glow" - this can be normalised only once, here, since 'position'
-	 * is really 'direction' and is the same for all vertices. */
+	/* Light 1: Diffuse background glow */
 	light1vc = normalize(vec3(gl_LightSource[1].position));
 	
-	/* Fill-in light */
+	/* Light 2: Fill-in light for lander */
 	light2vc = normalize(vec3(gl_LightSource[2].position));
-	light2hvc = normalize(vec3(gl_LightSource[2].halfVector - vert));
 	
 	/* Material properties */
 	col_ambi_diff = gl_Color.rgb;
-- 
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