Fixes grass with normal and specular textures.

Tested By: Langbart, marder, wowgetoffyourcellphone
Differential Revision: https://code.wildfiregames.com/D4968
This was SVN commit r27575.

binaries/data/mods/public/art/materials/basic_trans_wind_grain_norm_spec.xml

@@ -10,4 +10,6 @@
 	<required_texture name="specTex" define="USE_SPECULAR_MAP"/>
 	<shader effect="model_transparent"/>
 	<uniform name="windData" value="6.0 6.0"/>
+	<!-- TODO: use a separate material for translucent models. -->
+	<uniform name="effectSettings" value="0.0 50.0 0.0075"/>
 </material>

binaries/data/mods/public/shaders/glsl/model_common.fs

@@ -104,7 +104,7 @@ void main()
       specCol = specularColor;
       specPow = specularPower;
     #endif
-    specular.rgb = sunColor * specCol * pow(max(0.0, dot(normalize(normal), v_half)), specPow);
+    specular.rgb = sunColor * specCol * pow(max(0.001, dot(normalize(normal), v_half)), specPow);
   #endif
 
   #if (USE_INSTANCING || USE_GPU_SKINNING) && USE_AO

binaries/data/mods/public/shaders/glsl/terrain_common.fs

@@ -114,7 +114,7 @@ void main()
     specCol = s.rgb;
     specular.a = s.a;
     specPow = effectSettings.y;
-    specular.rgb = sunColor * specCol * pow(max(0.0, dot(normalize(normal), v_half)), specPow);
+    specular.rgb = sunColor * specCol * pow(max(0.001, dot(normalize(normal), v_half)), specPow);
   #endif
 
   vec3 color = (texdiffuse * sundiffuse + specular.rgb) * getShadowOnLandscape() + texdiffuse * ambient;