From 6f23c384bb07db5e0c4bdaf0a0340d0af47475d8 Mon Sep 17 00:00:00 2001
From: drumsetmonkey <abelleisle@roadrunner.com>
Date: Wed, 8 Jun 2016 08:41:44 -0400
Subject: Lighting!

---
 shaders/world.frag | 29 ++++++++++++++---------------
 1 file changed, 14 insertions(+), 15 deletions(-)

(limited to 'shaders/world.frag')

diff --git a/shaders/world.frag b/shaders/world.frag
index 3177795..bde5fa5 100644
--- a/shaders/world.frag
+++ b/shaders/world.frag
@@ -3,7 +3,7 @@ uniform sampler2D normalTex;
 
 varying vec2 texCoord;
 varying vec4 color;
-varying vec3 fragCoord;
+varying vec4 fragCoord;
 
 uniform vec4 ambientLight;
 uniform vec4 light[128];
@@ -11,26 +11,25 @@ uniform vec4 lightColor[128];
 uniform float lightImpact;
 uniform int lightSize;
 
-float b = .0005f;
-float minLight = .05f;
-float radius = sqrt(1.0f / (b * minLight));
-
 void main()
 {
-	vec4 pixTex = texture2D(texture, vec2(texCoord.x, 1-texCoord.y));
+	vec2 texLoc = vec2(texCoord.x, 1-texCoord.y);
+	vec4 pixTex = texture2D(texture, texLoc);
     if (pixTex.a < 0.1f) 
 		discard;
- 
+  
 	vec4 shadeColor = vec4(0.0f, 0.0f, 0.0f, 0.0f);
-	for (int i = 0; i < lightSize; i++) {
-		vec2 loc = light[i].xy;
-		float dist = length(loc - fragCoord.xy);
-		float attenuation = clamp(1.0f - dist*dist/(radius*radius), 0.0f, 1.0f);
-		attenuation *= attenuation;
-		
-		shadeColor += vec4(attenuation, attenuation, attenuation, 1.0f) * vec4(lightColor[i]);		
+	if (lightImpact > 0.0f) {
+		for (int i = 0; i < lightSize; i++) {
+			vec2 loc = light[i].xy;
+			float dist = length(loc - fragCoord.xy);
+			float attenuation = clamp(1.0f - dist*dist/(light[i].w*light[i].w), 0.0f, 1.0f);
+			attenuation *= attenuation;
+
+			shadeColor += (vec4(attenuation, attenuation, attenuation, 0.0f) * vec4(lightColor[i])) * lightImpact;		
+		}
 	}
-	shadeColor += ambientLight;	
+	shadeColor += ambientLight;
 
 	gl_FragColor = pixTex * color * shadeColor;
 }
-- 
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