1 files changed, 64 insertions, 19 deletions

diff --git a/indra/newview/app_settings/shaders/class1/environment/underWaterF.glsl b/indra/newview/app_settings/shaders/class1/environment/underWaterF.glsl
index 72e8e739b3..1fdb90f792 100644
--- a/indra/newview/app_settings/shaders/class1/environment/underWaterF.glsl
+++ b/indra/newview/app_settings/shaders/class1/environment/underWaterF.glsl
@@ -23,36 +23,82 @@
  * $/LicenseInfo$
  */
  
-
+#ifdef DEFINE_GL_FRAGCOLOR
+out vec4 gl_FragColor;
+#endif
 
 uniform sampler2D diffuseMap;
 uniform sampler2D bumpMap;   
 uniform sampler2D screenTex;
+uniform sampler2D refTex;
+uniform sampler2D screenDepth;
 
+uniform vec4 fogCol;
+uniform vec3 lightDir;
+uniform vec3 specular;
+uniform float lightExp;
+uniform vec2 fbScale;
 uniform float refScale;
+uniform float znear;
+uniform float zfar;
+uniform float kd;
+uniform vec4 waterPlane;
+uniform vec3 eyeVec;
 uniform vec4 waterFogColor;
+uniform float waterFogDensity;
+uniform float waterFogKS;
+uniform vec2 screenRes;
 
 //bigWave is (refCoord.w, view.w);
-varying vec4 refCoord;
-varying vec4 littleWave;
-varying vec4 view;
+VARYING vec4 refCoord;
+VARYING vec4 littleWave;
+VARYING vec4 view;
 
-void main() 
+vec4 applyWaterFog(vec4 color, vec3 viewVec)
 {
-	vec4 color;    
+	//normalize view vector
+	vec3 view = normalize(viewVec);
+	float es = -view.z;
+
+	//find intersection point with water plane and eye vector
 	
-	//get bigwave normal
-	vec3 wavef = texture2D(bumpMap, vec2(refCoord.w, view.w)).xyz*2.0;
-    
-	//get detail normals
-	vec3 dcol = texture2D(bumpMap, littleWave.xy).rgb*0.75;
-	dcol += texture2D(bumpMap, littleWave.zw).rgb*1.25;
-	    
-	//interpolate between big waves and little waves (big waves in deep water)
-	wavef = (wavef+dcol)*0.5;
+	//get eye depth
+	float e0 = max(-waterPlane.w, 0.0);
+	
+	//get object depth
+	float depth = length(viewVec);
+		
+	//get "thickness" of water
+	float l = max(depth, 0.1);
 
-	//crunch normal to range [-1,1]
-	wavef -= vec3(1,1,1);
+	float kd = waterFogDensity;
+	float ks = waterFogKS;
+	vec4 kc = waterFogColor;
+	
+	float F = 0.98;
+	
+	float t1 = -kd * pow(F, ks * e0);
+	float t2 = kd + ks * es;
+	float t3 = pow(F, t2*l) - 1.0;
+	
+	float L = min(t1/t2*t3, 1.0);
+	
+	float D = pow(0.98, l*kd);
+	//return vec4(1.0, 0.0, 1.0, 1.0);
+	return color * D + kc * L;
+	//depth /= 10.0;
+	//return vec4(depth,depth,depth,0.0);
+}
+
+void main() 
+{
+	vec4 color;
+	    
+	//get detail normals
+	vec3 wave1 = texture2D(bumpMap, vec2(refCoord.w, view.w)).xyz*2.0-1.0;
+	vec3 wave2 = texture2D(bumpMap, littleWave.xy).xyz*2.0-1.0;
+	vec3 wave3 = texture2D(bumpMap, littleWave.zw).xyz*2.0-1.0;    
+	vec3 wavef = normalize(wave1+wave2+wave3);
 	
 	//figure out distortion vector (ripply)   
 	vec2 distort = (refCoord.xy/refCoord.z) * 0.5 + 0.5;
@@ -60,6 +106,5 @@ void main()
 		
 	vec4 fb = texture2D(screenTex, distort);
 	
-	gl_FragColor.rgb = mix(waterFogColor.rgb, fb.rgb, waterFogColor.a * 0.001 + 0.999);
-	gl_FragColor.a = fb.a;
+	gl_FragColor = applyWaterFog(fb,view.xyz);
 }