Add shaders for osgText

Effects/text-default.eff

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+<?xml version="1.0" encoding="utf-8"?>
+<PropertyList>
+  <name>Effects/text-default</name>
+  <technique n="10">
+    <pass>
+      <lighting>true</lighting>
+      <blend>
+        <active>true</active>
+      </blend>
+      <rendering-hint>transparent</rendering-hint>
+      <program>
+        <vertex-shader>Shaders/text.vert</vertex-shader>
+        <fragment-shader>Shaders/text.frag</fragment-shader>
+        <fragment-shader>Shaders/include_fog.frag</fragment-shader>
+      </program>
+      <uniform>
+        <name>glyphTexture</name>
+        <type>sampler-2d</type>
+        <value type="int">0</value>
+      </uniform>
+    </pass>
+  </technique>
+</PropertyList>

Shaders/text.frag

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+#version 120
+
+uniform sampler2D glyphTexture;
+
+varying vec4 diffuse_term;
+varying vec3 normal;
+varying vec4 ecPosition;
+
+////fog "include" /////
+vec3 fog_Func(vec3 color, int type);
+//////////////////////
+
+void main()
+{
+    float alpha = texture2D(glyphTexture, gl_TexCoord[0].st).a;
+    if (alpha == 0.0) discard;
+
+    float NdotL, NdotHV, fogFactor;
+    vec4 color = gl_Color;
+    vec3 lightDir = gl_LightSource[0].position.xyz;
+    vec3 halfVector = gl_LightSource[0].halfVector.xyz;
+    vec4 fragColor;
+    vec4 specular = vec4(0.0);
+
+    NdotL = dot(normal, lightDir);
+    if (NdotL > 0.0) {
+        color += diffuse_term * NdotL;
+        NdotHV = max(dot(normal, halfVector), 0.0);
+        if (gl_FrontMaterial.shininess > 0.0)
+            specular.rgb = (gl_FrontMaterial.specular.rgb
+                            * gl_LightSource[0].specular.rgb
+                            * pow(NdotHV, gl_FrontMaterial.shininess));
+    }
+    // This shouldn't be necessary, but our lighting becomes very
+    // saturated. Clamping the color before modulating by the texture
+    // is closer to what the OpenGL fixed function pipeline does.
+    color = clamp(color, 0.0, 1.0);
+
+    fragColor = color + specular;
+    fragColor = vec4(fragColor.rgb, fragColor.a * alpha);
+
+    fragColor.rgb = fog_Func(fragColor.rgb, 0);
+    gl_FragColor = fragColor;
+}

Shaders/text.vert

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+#version 120
+
+varying vec4 diffuse_term;
+varying vec3 normal;
+varying vec4 ecPosition;
+
+void main()
+{
+    gl_Position = ftransform();
+    ecPosition = gl_ModelViewMatrix * gl_Vertex;
+    gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
+    normal = gl_NormalMatrix * gl_Normal;
+    diffuse_term = gl_FrontMaterial.diffuse * gl_LightSource[0].diffuse;
+    gl_FrontColor = gl_FrontMaterial.emission + gl_FrontMaterial.ambient *
+        (gl_LightModel.ambient + gl_LightSource[0].ambient);
+}