retuned horizontal blur

shaders/module/horizontal_blur.frag

@@ -8,21 +8,16 @@ float avg(float l, float c, float r) {
 vec3 hblur() {
 	vec3 center = texture2D(gcolor, texcoord).rgb;
 
-	vec2 leftPos = texcoord - neighborOffset;
+	vec3 sum = vec3(0);
-	vec2 rightPos = texcoord + neighborOffset;
+	int count = 0;
+	for(int x = -2; x < 2; x++) {
+		vec2 pos = texcoord - (neighborOffset * x);
+		if(pos.x >= 0 && pos.x < viewWidth) {
+			sum += texture2D(gcolor, pos).rgb;
+			count++;
+		}
+	}
 
-	vec3 left;
+	return sum / count;
-	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));
 }