Add an ARB equivalent for los_interp.

Accepted by: @vladislavbelov
Differential Revision: https://code.wildfiregames.com/D4420
This was SVN commit r26209.

binaries/data/mods/public/shaders/arb/los_interp.fp

@@ -0,0 +1,17 @@
+!!ARBfp1.0
+
+ATTRIB v_los = fragment.texcoord[0];
+PARAM delta = program.local[0];
+
+TEMP los1_tex;
+TEMP los2_tex;
+
+TEX los1_tex, v_los, texture[0], 2D;
+TEX los2_tex, v_los, texture[1], 2D;
+
+TEMP smoothing;
+MOV_SAT smoothing, delta.x;
+
+LRP result.color.a, smoothing, los1_tex.a, los2_tex.a;
+
+END

binaries/data/mods/public/shaders/arb/los_interp.vp

@@ -0,0 +1,6 @@
+!!ARBvp1.0
+
+MOV result.position, vertex.position;
+MOV result.texcoord, vertex.texcoord[0];
+
+END

binaries/data/mods/public/shaders/arb/los_interp.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<program type="arb">
+    <vertex file="arb/los_interp.vp">
+        <stream name="pos"/>
+        <stream name="uv0"/>
+    </vertex>
+    <fragment file="arb/los_interp.fp">
+        <uniform name="delta" loc="0" type="vec3"/>
+        <uniform name="losTex1" loc="0" type="sampler2D"/>
+        <uniform name="losTex2" loc="1" type="sampler2D"/>
+    </fragment>
+</program>

binaries/data/mods/public/shaders/effects/los_interp.xml

@@ -1,9 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
 <effect>
-
+    <technique>
+        <require shaders="arb"/>
+        <pass shader="arb/los_interp"/>
+    </technique>
     <technique>
         <require shaders="glsl"/>
-	<pass shader="glsl/los_interp"/>
+        <pass shader="glsl/los_interp"/>
     </technique>
-
 </effect>