From 3b0abb20ad6e5da59e66cf701b07ff39ff3bd24c Mon Sep 17 00:00:00 2001
From: phil <philjord@ihug.co.nz>
Date: Sat, 5 Nov 2016 10:15:22 +1300
Subject: fog example in default shader corrected

---
 .../gl2es2pipeline/fixed_function_shader.frag      | 28 +++++++++++-----------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/src/classes/org/jdesktop/j3d/examples/gl2es2pipeline/fixed_function_shader.frag b/src/classes/org/jdesktop/j3d/examples/gl2es2pipeline/fixed_function_shader.frag
index d6f5e96..60076e6 100644
--- a/src/classes/org/jdesktop/j3d/examples/gl2es2pipeline/fixed_function_shader.frag
+++ b/src/classes/org/jdesktop/j3d/examples/gl2es2pipeline/fixed_function_shader.frag
@@ -9,10 +9,10 @@ uniform float alphaTestValue;
 
 struct fogData
 {
-	int fogEnabled = -1;
-	vec3 expColor = new Vector3f();
+	int fogEnabled;
+	vec4 expColor;
 	float expDensity;
-	vec3 linearColor = new Vector3f();
+	vec4 linearColor;
 	float linearStart;
 	float linearEnd;
 };
@@ -89,32 +89,32 @@ void main( void )
 	color.rgb = albedo * (diffuse + emissive) + spec;
 	color.a = C.a * baseMap.a;
 	
-	if(fogData.fogEnabled == 1)
+	float fogFactor = 0.0;    
+ 	
+    if(fogData.fogEnabled == 1)
 	{
 		//distance
 		float dist = 0.0;
-		float fogFactor = 0.0;
 		 
 		//compute distance used in fog equations
 		dist = length(ViewDir);		 
 		 
 		if(fogData.linearEnd > 0.0)//linear fog
 		{
-		   fogFactor = (fogData.linearEnd - dist)/(fogData.linearEnd - fogData.linearStart);
+		   fogFactor = 1.0-((fogData.linearEnd - dist)/(fogData.linearEnd - fogData.linearStart));
 		   fogFactor = clamp( fogFactor, 0.0, 1.0 );
-		 
-		   //if you inverse color in glsl mix function you have to put 1.0 - fogFactor
-		   color = mix(fogData.linearColor, color, fogFactor);
+		   color = mix(color, fogData.linearColor, fogFactor);			    
 		}
 		else if( fogData.expDensity > 0.0)// exponential fog
 		{
-		    fogFactor = 1.0 /exp(dist * fogData.expDensity);
+		    fogFactor = 1.0-(1.0 /exp(dist * fogData.expDensity));
 		    fogFactor = clamp( fogFactor, 0.0, 1.0 );
-		 
-		    // mix function fogColor-(1-fogFactor) + lightColor-fogFactor
-		    color = mix(fogData.expColor, color, fogFactor);
-		}
+		    color = mix(color, fogData.expColor, fogFactor);
+		}	
+		color.a = color.a + fogFactor; 	 
 	}
+     
+	glFragColor = color;
 
 	glFragColor = color;
 }
-- 
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