1 files changed, 42 insertions, 8 deletions
diff --git a/indra/newview/app_settings/shaders/class1/environment/waterFogF.glsl b/indra/newview/app_settings/shaders/class1/environment/waterFogF.glsl
index d44690d1fb..4bdfce9260 100644
--- a/indra/newview/app_settings/shaders/class1/environment/waterFogF.glsl
+++ b/indra/newview/app_settings/shaders/class1/environment/waterFogF.glsl
@@ -25,16 +25,50 @@
  
 
 
+uniform vec4 lightnorm;
+uniform vec4 waterPlane;
+uniform vec4 waterFogColor;
+uniform float waterFogDensity;
+uniform float waterFogKS;
+
+vec3 getPositionEye();
+
 vec4 applyWaterFog(vec4 color)
 {
-	// GL_EXP2 Fog
-	//float fog = exp(-gl_Fog.density * gl_Fog.density * gl_FogFragCoord * gl_FogFragCoord);
-	// GL_EXP Fog
-	// float fog = exp(-gl_Fog.density * gl_FogFragCoord);
-	// GL_LINEAR Fog
-	float fog = (gl_Fog.end - gl_FogFragCoord) * gl_Fog.scale;
-	fog = clamp(fog, 0.0, 1.0);
-	color.rgb = mix(gl_Fog.color.rgb, color.rgb, fog);
+	//normalize view vector
+	vec3 view = normalize(getPositionEye());
+	float es = -(dot(view, waterPlane.xyz));
+
+	//find intersection point with water plane and eye vector
+	
+	//get eye depth
+	float e0 = max(-waterPlane.w, 0.0);
+	
+	vec3 int_v = waterPlane.w > 0.0 ? view * waterPlane.w/es : vec3(0.0, 0.0, 0.0);
+	
+	//get object depth
+	float depth = length(getPositionEye() - int_v);
+		
+	//get "thickness" of water
+	float l = max(depth, 0.1);
+
+	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);
+	
+	color.rgb = color.rgb * D + kc.rgb * L;
+	color.a = kc.a + color.a;
+	
 	return color;
 }