Fix tiling issues in Tropical South America airport keep definitions

Effects/airfield.eff

@@ -19,9 +19,19 @@
 		    <wrap-t>repeat</wrap-t>
 		    <internal-format>normalized</internal-format>
 		</texture>
+		<texture n="15">
+		    <image>Textures/Terrain/void.png</image>
+			<type>2d</type>
+		    <filter>linear-mipmap-linear</filter>
+		    <wrap-s>repeat</wrap-s>
+		    <wrap-t>repeat</wrap-t>
+		    <internal-format>normalized</internal-format>
+		</texture>
 		<base_layer_magnification>5.0</base_layer_magnification>
 		<overlay_layer_magnification>4.0</overlay_layer_magnification>
+		<grain_layer_magnification>4.0</grain_layer_magnification>
 		<use_overlay>0</use_overlay>
+		<use_grain>0</use_grain>
 		<use_color_overlay>1</use_color_overlay>
 		<grit_alpha>1.0</grit_alpha>
 		<overlay_bias>0.0</overlay_bias>
@@ -115,6 +125,17 @@
             <use>texture[14]/internal-format</use>
           </internal-format>
       </texture-unit>
+      <texture-unit>
+        <unit>2</unit>
+          <image><use>texture[15]/image</use></image>
+	  <type><use>texture[15]/type</use></type>
+          <filter><use>texture[15]/filter</use></filter>
+          <wrap-s><use>texture[15]/wrap-s</use></wrap-s>
+          <wrap-t><use>texture[15]/wrap-t</use></wrap-t>
+          <internal-format>
+            <use>texture[15]/internal-format</use>
+          </internal-format>
+      </texture-unit>
       <program>
         <vertex-shader>Shaders/terrain-ALS-ultra.vert</vertex-shader>
         <fragment-shader>Shaders/airfield-ALS.frag</fragment-shader>
@@ -219,6 +240,11 @@
 	<type>float</type>
 	<value><use>overlay_layer_magnification</use></value>
       </uniform>
+     <uniform>
+	<name>grain_layer_magnification</name>
+	<type>float</type>
+	<value><use>grain_layer_magnification</use></value>
+      </uniform>
       <uniform>
         <name>cloud_self_shading</name>
         <type>float</type>
@@ -522,6 +548,11 @@
 	<type>int</type>
 	<value>	<use>use_overlay</use></value>
       </uniform>
+     <uniform>
+	<name>use_grain</name>
+	<type>int</type>
+	<value>	<use>use_grain</use></value>
+      </uniform>
       <uniform>
 	<name>use_color_overlay</name>
 	<type>int</type>
@@ -567,6 +598,11 @@
 	<type>sampler-2d</type>
 	<value type="int">1</value>
       </uniform>
+      <uniform>
+	<name>grain_texture</name>
+	<type>sampler-2d</type>
+	<value type="int">2</value>
+      </uniform>
       <uniform>
         <name>colorMode</name>
         <type>int</type>

Materials/regions/tropical_south_america.xml

@@ -51,15 +51,18 @@
     <texture-set>
       <texture>Terrain/california-grass.png</texture>
       <texture n="13">Terrain/california-grass.png</texture>
-      <texture n="14">Terrain/airport_grass_overlay.png</texture>
+      <texture n="14">Terrain/california-grass-hires.png</texture>
+      <texture n="15">Terrain/airport_grass_overlay.png</texture>
     </texture-set>
     <parameters>
       <grit_alpha>0.4</grit_alpha>
       <use_overlay>1</use_overlay>
-			<overlay_bias>0.5</overlay_bias>
+      <use_grain>1</use_grain>
+      <overlay_bias>0.0</overlay_bias>
       <use_color_overlay>0</use_color_overlay>
       <base_layer_magnification>1.0</base_layer_magnification>
       <overlay_layer_magnification>4.0</overlay_layer_magnification>
+      <grain_layer_magnification>4.0</grain_layer_magnification>
     </parameters>
     <xsize>128</xsize>
     <ysize>128</ysize>

Shaders/airfield-ALS.frag

@@ -12,7 +12,7 @@ varying vec3 ecViewdir;
 
 uniform sampler2D texture;
 uniform sampler2D overlay_texture;
-
+uniform sampler2D grain_texture;
 
 varying float steepness;
 
@@ -35,6 +35,7 @@ uniform float overlay_bias;
 uniform float overlay_alpha;
 uniform float base_layer_magnification;
 uniform float overlay_layer_magnification;
+uniform float grain_layer_magnification;
 uniform float wetness;
 uniform float air_pollution;
 uniform float season;
@@ -46,6 +47,7 @@ uniform int quality_level;
 uniform int tquality_level;
 uniform int cloud_shadow_flag;
 uniform int use_overlay;
+uniform int use_grain;
 uniform int use_color_overlay;
 uniform int use_searchlight;
 uniform int use_landing_light;
@@ -119,6 +121,7 @@ float ct = dot(vec3(0.0, 0.0, 1.0), relPos)/dist;
 	{halfVector = normalize(normalize(lightDir) + normalize(ecViewdir));}
     vec4 texel;
     vec4 overlay_texel;
+    vec4 grain_texel;
     vec4 snow_texel;
     vec4 fragColor;
     vec4 specular = vec4(0.0);
@@ -184,6 +187,12 @@ if (use_overlay == 1)
 
 	}
 
+if (use_grain == 1)
+	{
+	grain_texel = texture2D(grain_texture, gl_TexCoord[0].st * grain_layer_magnification);	
+	texel.rgb = mix(texel.rgb, grain_texel.rgb, grain_texel.a);
+	}
+