From 8f4258b11900640199cf0f156b4916b0e3acd39a Mon Sep 17 00:00:00 2001
From: Anuken <arnukren@gmail.com>
Date: Tue, 26 Feb 2019 16:02:06 -0500
Subject: [PATCH] Build shader swap

---
 core/assets/shaders/unitbuild.fragment | 27 +++++++++++++++-----------
 1 file changed, 16 insertions(+), 11 deletions(-)

diff --git a/core/assets/shaders/unitbuild.fragment b/core/assets/shaders/unitbuild.fragment
index 1faf952c8d..35a956c35a 100644
--- a/core/assets/shaders/unitbuild.fragment
+++ b/core/assets/shaders/unitbuild.fragment
@@ -3,6 +3,8 @@ precision mediump float;
 precision mediump int;
 #endif
 
+#define step 3.0
+
 uniform sampler2D u_texture;
 
 uniform float u_time;
@@ -15,19 +17,22 @@ uniform vec2 u_texsize;
 varying vec4 v_color;
 varying vec2 v_texCoord;
 
-#define SPACE 1.3
-#define RADIUS 2.0
+bool id(vec4 v){
+    return v.a > 0.1;
+}
 
-bool cont(vec2 t, vec2 v){
+bool id(vec2 coords, vec4 base){
+    vec4 target = texture2D(u_texture, coords);
+    return  target.a < 0.1 || (coords.x < u_uv.x || coords.y < u_uv.y || coords.x > u_uv2.x || coords.y > u_uv2.y);
+}
 
-    for(float cx = -RADIUS; cx <= RADIUS; cx ++){
-        for(float cy = -RADIUS; cy <= RADIUS; cy ++){
-            if(cx*cx + cy*cy <= RADIUS * RADIUS && texture2D(u_texture, v_texCoord.xy + vec2(cx, cy) * v * SPACE).a <= 0.001){
-                return true;
-            }
-        }
-    }
-    return false;
+bool cont(vec2 T, vec2 v){
+    vec4 base = texture2D(u_texture, T);
+    return base.a > 0.1 &&
+           		(id(T + vec2(0, step) * v, base) || id(T + vec2(0, -step) * v, base) ||
+           		id(T + vec2(step, 0) * v, base) || id(T + vec2(-step, 0) * v, base) ||
+           		id(T + vec2(step, step) * v, base) || id(T + vec2(-step, -step) * v, base) ||
+                           		id(T + vec2(step, -step) * v, base) || id(T + vec2(-step, step) * v, base));
 }
 
 void main() {