Many bugfixes and tweaks

core/assets/shaders/shield.fragment

@@ -5,6 +5,7 @@ precision mediump int;
 
 #define MAX_HITS 64
 #define HIT_RADIUS 12.0
+#define ALPHA 0.18
 
 uniform sampler2D u_texture;
 
@@ -53,7 +54,7 @@ void main() {
 	            color *= 1.65;
 	        }
 	        
-	        color.a = 0.18;
+	        color.a = ALPHA;
 	        
 	        for(int i = 0; i < u_hitamount; i ++){
 	    		vec3 hit = u_hits[i];
@@ -62,7 +63,7 @@ void main() {
 	    	
 	    		if(abs(distance(vec2(hit.x, hit.y), coords - u_texsize/2.0) - rad) < 1.0){
 	    			color = mix(color, u_color* vec4(si, si, si, 1.0), (1.0 * fract));
-	    			color.a = 0.18 + 0.82 *fract;
+	    			color.a = ALPHA + 0.82 *fract;
 	    		}
 	    	}
 	    }