cleaned up horizontal blur code

shaders/final.fsh

@@ -8,40 +8,14 @@ varying vec2 texcoord;
 uniform sampler2D gcolor;
 uniform float viewWidth;
 
-#ifdef hBlur
-
-vec2 neighbor = vec2(1 / viewWidth, 0);
-
-float avg(float l, float c, float r) {
-	return (l + c + r) / 3;
-}
+#include "/module/horizontal_blur.frag"
 
 void main() {
-	vec3 color = texture2D(gcolor, texcoord).rgb;
-
-	vec2 left = texcoord - neighbor;
-	vec2 right = texcoord + neighbor;
-	vec3 lColor;
-	if(left.x >= 0)
-		lColor = texture2D(gcolor, left).rgb;
-	else
-		lColor = color;
-
-	vec3 rColor;
-	if(right.x <= viewWidth)
-		rColor = texture2D(gcolor, right).rgb;
-	else
-		rColor = color;
-
-	vec3 blurred = vec3(avg(lColor.r, color.r, rColor.r), avg(lColor.g, color.g, rColor.g), avg(lColor.b, color.b, rColor.b));
+	#ifdef hblur
+		vec3 blurred = hblur();
 		gl_FragData[0] = vec4(blurred, 1);
-}
-
-#else
-
-void main() {
+	#else
 		gl_FragData[0] = texture2D(gcolor, texcoord);
+	#endif
 }
 
-#endif
-

shaders/module/horizontal_blur.frag

@@ -0,0 +1,28 @@
+
+vec2 neighborOffset = vec2(1 / viewWidth, 0);
+
+float avg(float l, float c, float r) {
+	return (l + c + r) / 3;
+}
+
+vec3 hblur() {
+	vec3 center = texture2D(gcolor, texcoord).rgb;
+
+	vec2 leftPos = texcoord - neigborOffset;
+	vec2 rightPos = texcoord + neighborOffset;
+
+	vec3 left;
+	if(leftPos.x >= 0)
+		left = texture2D(gcolor, leftPos).rgb;
+	else
+		left = center;
+
+	vec3 right;
+	if(rightPos.x >= 0)
+		right = texture2D(gcolor, rightPos).rgb;
+	else
+		right = center;
+
+	return vec3(avg(left.r, center.r, right.r), avg(left.g, center.g, right.g), avg(left.b, center.b, right.b));
+}
+