Add runway rain effect (experimental)

Signed-off-by: Vivian Meazza <vivian.meazza@lineone.net>

Effects/reflect-bump-spec.eff

@@ -107,6 +107,24 @@ EXAMPLES: You can find examples of both usages in the Hunter and Lightning model
 		<ambient_correction>0.05</ambient_correction>
 		<reflect_map>0</reflect_map>
 		<normalmap_dds>0</normalmap_dds>
+		<visibility>
+			<use>/environment/ground-visibility-m</use>
+		</visibility>
+		<avisibility>
+			<use>/environment/visibility-m</use>
+		</avisibility>
+		<lthickness>
+			<use>/environment/ground-haze-thickness-m</use>
+		</lthickness>
+		<scattering>
+			<use>/rendering/scene/scattering</use>
+		</scattering>
+		<terminator>
+			<use>/environment/terminator-relative-position-m</use>
+		</terminator>
+		<fogtype>
+			<use>/sim/rendering/scattering-shader</use>
+		</fogtype>
 	</parameters>
 
 	<generate>
@@ -296,7 +314,9 @@ EXAMPLES: You can find examples of both usages in the Hunter and Lightning model
 
 
 			<program>
+				<vertex-shader>Shaders/include_fog.vert</vertex-shader>
 				<vertex-shader>Shaders/reflect-bump-spec.vert</vertex-shader>
+				<fragment-shader>Shaders/include_fog.frag</fragment-shader>
 				<fragment-shader>Shaders/reflect-bump-spec.frag</fragment-shader>
 				<attribute>
 					<name>tangent</name>
@@ -415,6 +435,48 @@ EXAMPLES: You can find examples of both usages in the Hunter and Lightning model
 				</value>
 			</uniform>
 
+			<uniform>
+				<name>visibility</name>
+				<type>float</type>
+				<value>
+					<use>visibility</use>
+				</value>
+			</uniform>
+			<uniform>
+				<name>avisibility</name>
+				<type>float</type>
+				<value>
+					<use>avisibility</use>
+				</value>
+			</uniform>
+			<uniform>
+				<name>hazeLayerAltitude</name>
+				<type>float</type>
+				<value>
+					<use>lthickness</use>
+				</value>
+			</uniform>
+			<uniform>
+				<name>scattering</name>
+				<type>float</type>
+				<value>
+					<use>scattering</use>
+				</value>
+			</uniform>
+			<uniform>
+				<name>terminator</name>
+				<type>float</type>
+				<value>
+					<use>terminator</use>
+				</value>
+			</uniform>
+			<uniform>
+				<name>fogType</name>
+				<type>int</type>
+				<value>
+					<use>fogtype</use>
+				</value>
+			</uniform>
 		</pass>
 	</technique>
 </PropertyList>

Shaders/runway-reflect-bump-spec.frag

@@ -0,0 +1,139 @@
+// -*- mode: C; -*-
+// Licence: GPL v2
+// Author: Vivian Meazza.
+
+#version 120
+
+varying vec3  rawpos;
+varying vec3  VNormal;
+varying vec3  VTangent;
+varying vec3  VBinormal;
+varying vec3  Normal;
+varying vec3  vViewVec;
+varying vec3  reflVec;
+
+varying vec4 Diffuse;
+varying float alpha;
+varying float fogCoord;
+
+uniform samplerCube Environment;
+uniform sampler2D Rainbow;
+uniform sampler2D BaseTex;
+uniform sampler2D Fresnel;
+uniform sampler2D Map;
+uniform sampler2D NormalTex;
+uniform sampler3D Noise;
+
+uniform float spec_adjust;
+uniform float rainbowiness;
+uniform float fresneliness;
+uniform float noisiness;
+uniform float ambient_correction;
+uniform float reflect_map;
+uniform float normalmap_dds;
+
+uniform int fogType;
+
+vec3 fog_Func(vec3 color, int type);
+
+void main (void)
+{
+    vec3 halfV;
+    float NdotL, NdotHV;
+
+    vec3 lightDir = gl_LightSource[0].position.xyz;
+    vec3 halfVector = gl_LightSource[0].halfVector.xyz;
+
+
+    vec4 color = gl_Color;
+    vec4 specular = vec4(0.0);
+    vec4 ns = texture2D(NormalTex, gl_TexCoord[0].st * 16.0);
+    vec3 n = ns.rgb * 2.0 - 1.0;
+    n = normalize(n.x * VTangent + n.y * VBinormal + n.z * VNormal);
+
+    //fix dds normal
+    if (normalmap_dds > 0.0) {
+        n = -n;
+    }
+
+    NdotL = max(0.0, dot(n, lightDir));
+
+    // calculate the specular light
+    if (NdotL > 0.0) {
+        color += Diffuse * NdotL;
+        halfV = normalize(halfVector);
+        NdotHV = max(dot(n, halfV), 0.0);
+        if (gl_FrontMaterial.shininess > 0.0)
+            specular.rgb = (gl_FrontMaterial.specular.rgb * ns.a
+            * gl_LightSource[0].specular.rgb
+            * pow(NdotHV, gl_FrontMaterial.shininess + 128 * spec_adjust));
+    }
+
+    //color.a = alpha;
+    vec4 texel = texture2D(BaseTex, gl_TexCoord[0].st);
+    //vec4 texelcolor = color * texel + specular;
+    color.a = texel.a * alpha;
+    color = clamp(color, 0.0, 1.0);
+
+    // calculate the fog factor
+    //const float LOG2 = 1.442695;
+    //float fogFactor = exp2(-gl_Fog.density * gl_Fog.density * fogCoord * fogCoord * LOG2);
+    //fogFactor = clamp(fogFactor, 0.0, 1.0);
+
+    //if(gl_Fog.density == 1.0)
+    //    fogFactor=1.0;
+
+    vec3 normal = normalize(VNormal);
+    vec3 viewVec = normalize(vViewVec);
+
+    // Map a rainbowish color
+    float v = dot(viewVec, normal);
+    vec4 rainbow = texture2D(Rainbow, vec2(v, 0.0));
+
+    // Map a fresnel effect
+    vec4 fresnel = texture2D(Fresnel, vec2(v, 0.0));
+
+    // map the refection of the environment
+    vec4 reflection = textureCube(Environment, reflVec);
+
+    float refl_correction = spec_adjust * 1.7 - 1.0;
+    // set the user shininess offset
+    float transparency_offset = clamp(refl_correction, -1.0, 1.0);
+    float reflFactor = 0.0;
+
+    vec4 map = texture2D(Map, gl_TexCoord[0].st * 8.0);
+    if(reflect_map > 0.0){
+        // map the shininess of the object with user input
+        //float pam = (map.a * -2) + 1; //reverse map
+        reflFactor = map.a *(1.0- n.z) + transparency_offset;
+    } else {
+        // set the reflectivity proportional to shininess with user input
+        reflFactor = (gl_FrontMaterial.shininess / 128.0) + transparency_offset;
+    }
+
+    reflFactor = clamp(reflFactor, 0.0, 0.75);
+
+    // set ambient adjustment to remove bluiness with user input
+    float ambient_offset = clamp(ambient_correction, -1.0, 1.0);
+    vec4 ambient_Correction = vec4(gl_LightSource[0].ambient.rg, gl_LightSource[0].ambient.b * 0.6, 0.5) * ambient_offset ;
+    ambient_Correction = clamp(ambient_Correction, -1.0, 1.0);
+
+    // map noise vector
+    vec4 noisevec = texture3D(Noise, rawpos.xyz);
+
+    // add fringing fresnel and rainbow effects and modulate by reflection
+    vec4 reflcolor = mix(reflection, rainbow, rainbowiness * v);
+    vec4 reflfrescolor = mix(reflcolor, fresnel, fresneliness * v);
+    vec4 noisecolor = mix(reflfrescolor, noisevec, noisiness);
+    vec4 raincolor = vec4(noisecolor.rgb * reflFactor, 1.0);
+
+    vec4 mixedcolor = mix(texel, raincolor, reflFactor);
+
+    // the final reflection
+    vec4 reflColor = vec4(color.rgb * mixedcolor.rgb + specular.rgb + ambient_Correction.rgb, color.a);
+
+    reflColor = clamp(reflColor, 0.0, 1.0);
+    vec4 fragColor = reflColor;
+    fragColor.rgb = fog_Func(fragColor.rgb, fogType);
+    gl_FragColor = fragColor;
+}