1 files changed, 53 insertions, 2 deletions
diff --git a/indra/newview/app_settings/shaders/class1/deferred/fullbrightAlphaMaskF.glsl b/indra/newview/app_settings/shaders/class1/deferred/fullbrightAlphaMaskF.glsl
index a74256de81..00743abe34 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/fullbrightAlphaMaskF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/fullbrightAlphaMaskF.glsl
@@ -61,6 +61,52 @@ vec3 linear_to_srgb(vec3 cl)
 	return 1.055 * pow(cl, vec3(0.41666)) - 0.055;
 }
 
+#ifdef WATER_FOG
+uniform vec4 waterPlane;
+uniform vec4 waterFogColor;
+uniform float waterFogDensity;
+uniform float waterFogKS;
+
+vec4 applyWaterFogDeferred(vec3 pos, vec4 color)
+{
+	//normalize view vector
+	vec3 view = normalize(pos);
+	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(pos - 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;
+}
+#endif
+
 uniform float minimum_alpha;
 
 void main() 
@@ -72,7 +118,7 @@ void main()
 #endif
 
 	float final_alpha = color.a * vertex_color.a;
-	if (final_alpha < minimum_alpha)
+	if (color.a < minimum_alpha)
 	{
 		discard;
 	}
@@ -84,7 +130,12 @@ void main()
 	color.rgb = fullbrightScaleSoftClip(color.rgb);
 
 	color.rgb = linear_to_srgb(color.rgb);
-	//color.rgb = vec3(1,0,1);
+
+
+#ifdef WATER_FOG
+	color = applyWaterFogDeferred(pos, vec4(color));
+#endif
+
 	frag_color.rgb = color.rgb;
 	frag_color.a   = final_alpha;
 }