Terrain effect has a shader

Effects/terrain-default.eff

@@ -38,6 +38,51 @@
       <bin-name>RenderBin</bin-name>
     </render-bin>
   </parameters>
+  <technique>
+    <predicate>
+      <less-equal>
+        <value type="float">2.0</value>
+        <glversion/>
+      </less-equal>
+    </predicate>
+    <pass>
+      <lighting>true</lighting>
+      <material>
+        <ambient><use>material/ambient</use></ambient>
+        <diffuse><use>material/diffuse</use></diffuse>
+        <specular><use>material/specular</use></specular>
+        <color-mode>ambient-and-diffuse</color-mode>
+      </material>
+      <blend><use>transparent</use></blend>
+      <alpha-test><use>transparent</use></alpha-test>
+      <shade-model>smooth</shade-model>
+      <cull-face>back</cull-face>
+      <render-bin>
+        <bin-number><use>render-bin/bin-number</use></bin-number>
+        <bin-name><use>render-bin/bin-name</use></bin-name>
+      </render-bin>
+      <texture-unit>
+        <unit>0</unit>
+        <texture2d><use>texture0/texture2d</use>
+          <image><use>texture0/texture2d/image</use></image>
+          <filter><use>texture0/texture2d/filter</use></filter>
+          <wrap-s><use>texture0/texture2d/wrap-s</use></wrap-s>
+          <wrap-t><use>texture0/texture2d/wrap-t</use></wrap-t>
+          <internal-format>
+            <use>texture0/texture2d/internal-format</use>
+          </internal-format>
+        </texture2d>
+      </texture-unit>
+      <program>
+        <vertex-shader>Shaders/default.vert</vertex-shader>
+        <fragment-shader>Shaders/default.frag</fragment-shader>
+      </program>
+      <uniform>
+      <name>texture</name>
+      <type>sampler-2d</type>
+      <value type="int">0</value></uniform>
+    </pass>
+  </technique>
   <technique>
     <pass>
       <lighting>true</lighting>

Shaders/default.frag

@@ -0,0 +1,30 @@
+// -*-C++-*-
+
+varying vec4 diffuse, ambient;
+varying vec3 normal, lightDir, halfVector;
+varying float fogCoord;
+
+uniform sampler2D texture;
+
+void main()
+{
+    vec3 n, halfV;
+    float NdotL, NdotHV, fogFactor;
+    vec4 color = ambient;
+    vec4 texel;
+    vec4 fragColor;
+
+    n = normalize(normal);
+    NdotL = max(dot(n, lightDir), 0.0);
+    if (NdotL > 0.0) {
+        color += diffuse * NdotL;
+        halfV = normalize(halfVector);
+        NdotHV = max(dot(n, halfV), 0.0);
+        color += gl_FrontMaterial.specular * gl_LightSource[0].specular
+            * pow(NdotHV, gl_FrontMaterial.shininess);
+    }
+    texel = texture2D(texture, gl_TexCoord[0].st);
+    fragColor = color * texel;
+    fogFactor = exp(-gl_Fog.density * gl_Fog.density * fogCoord * fogCoord);
+    gl_FragColor = mix(gl_Fog.color, fragColor, fogFactor);
+}

Shaders/default.vert

@@ -0,0 +1,26 @@
+// -*-C++-*-
+
+// Shader that uses OpenGL state values to do per-pixel lighting
+//
+// The only light used is gl_LightSource[0], which is assumed to be
+// directional.
+//
+// Diffuse and ambient colors come from the gl_Color. This is
+// equivalent to osg::Material::AMBIENT_AND_DIFFUSE.
+
+varying vec4 diffuse, ambient;
+varying vec3 normal, lightDir, halfVector;
+varying float fogCoord;
+
+void main()
+{
+    vec3 ecPosition = vec3(gl_ModelViewMatrix * gl_Vertex);
+    gl_Position = ftransform();
+    gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
+    normal = gl_NormalMatrix * gl_Normal;
+    lightDir = normalize(vec3(gl_LightSource[0].position));
+    halfVector = normalize(gl_LightSource[0].halfVector.xyz);
+    diffuse = gl_Color * gl_LightSource[0].diffuse;
+    ambient = gl_Color * gl_LightSource[0].ambient;
+    fogCoord = abs(ecPosition.z);
+}