1 files changed, 54 insertions, 0 deletions

diff --git a/linden/indra/newview/app_settings/shaders/class2/environment/waterFogF.glsl b/linden/indra/newview/app_settings/shaders/class2/environment/waterFogF.glsl
new file mode 100644
index 0000000..522c990
--- /dev/null
+++ b/linden/indra/newview/app_settings/shaders/class2/environment/waterFogF.glsl
@@ -0,0 +1,54 @@
+/**
+ * @file waterFogF.glsl
+ *
+ * Copyright (c) 2007-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+uniform vec4 lightnorm;
+uniform vec4 waterPlane;
+uniform vec4 waterFogColor;
+uniform float waterFogDensity;
+uniform float waterFogKS;
+
+vec3 getPositionEye();
+
+vec4 applyWaterFog(vec4 color)
+{
+        //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;
+}
+