fix runway shader normals in Rembrandt.

Signed-off-by: Emilian Huminiuc <emilianh@gmail.com>

Effects/runway.eff

@@ -247,7 +247,7 @@
             </material>
             <cull-face>back</cull-face>
             <program>
-                <vertex-shader>Shaders/reflect-bump-spec.vert</vertex-shader>
+                <vertex-shader>Shaders/runway-gbuffer.vert</vertex-shader>
                 <fragment-shader>Shaders/runway-gbuffer.frag</fragment-shader>
                 <fragment-shader>Shaders/gbuffer-functions.frag</fragment-shader>
                 <fragment-shader>Shaders/gbuffer-encode.frag</fragment-shader>

Shaders/runway-gbuffer.vert

@@ -0,0 +1,70 @@
+// -*- mode: C; -*-
+// Licence: GPL v2
+// © Emilian Huminiuc and Vivian Meazza 2011
+
+varying vec3  rawpos;
+varying float fogCoord;
+varying vec3  VNormal;
+varying vec3  VTangent;
+varying vec3  VBinormal;
+varying vec3  Normal;
+varying vec3 vViewVec;
+varying vec3 reflVec;
+
+varying vec4 Diffuse;
+varying float alpha;
+
+uniform mat4 osg_ViewMatrixInverse;
+
+attribute vec3 tangent;
+attribute vec3 binormal;
+
+////fog "include"////////
+// uniform int fogType;
+//
+// void fog_Func(int type);
+/////////////////////////
+
+void main(void)
+{
+    rawpos     = gl_Vertex.xyz / gl_Vertex.w;
+    vec4 ecPosition = gl_ModelViewMatrix * gl_Vertex;
+    ecPosition.xyz = ecPosition.xyz / ecPosition.w;
+    //fogCoord = ecPosition.z;
+    //fog_Func(fogType);
+
+    vec3 n = normalize(gl_Normal);
+    vec3 t = cross(gl_Normal, vec3(1.0,0.0,0.0));
+    vec3 b = cross(n,t);
+
+    VNormal = gl_NormalMatrix * gl_Normal;
+    VTangent = normalize(gl_NormalMatrix * tangent);
+    VBinormal = normalize(gl_NormalMatrix * binormal);
+    Normal = normalize(gl_Normal);
+
+    Diffuse = gl_Color * gl_LightSource[0].diffuse;
+    //Diffuse= gl_Color.rgb * max(0.0, dot(normalize(VNormal), gl_LightSource[0].position.xyz));
+
+    // Super hack: if diffuse material alpha is less than 1, assume a
+    // transparency animation is at work
+    if (gl_FrontMaterial.diffuse.a < 1.0)
+        alpha = gl_FrontMaterial.diffuse.a;
+    else
+        alpha = gl_Color.a;
+
+    // Vertex in eye coordinates
+    vec3 vertVec = ecPosition.xyz;
+
+    vViewVec.x = dot(t, vertVec);
+    vViewVec.y = dot(b, vertVec);
+    vViewVec.z = dot(n, vertVec);
+
+    // calculate the reflection vector
+    vec4 reflect_eye = vec4(reflect(vertVec, VNormal), 0.0);
+    reflVec = normalize(gl_ModelViewMatrixInverse * reflect_eye).xyz;
+
+    gl_FrontColor = gl_FrontMaterial.emission + gl_Color * (gl_LightModel.ambient + gl_LightSource[0].ambient);
+
+    gl_Position = ftransform();
+    gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
+}