enhance target painting

lineStipple.fs

@@ -0,0 +1,16 @@
+#version 330 core
+in vec4 color;
+
+in float dist;
+uniform vec2  u_resolution;
+uniform float u_dashSize;
+uniform float u_gapSize;
+
+out vec4 FragColor;
+void main()
+{
+    if (fract(dist / (u_dashSize + u_gapSize)) > u_dashSize/(u_dashSize + u_gapSize))
+        discard; 
+
+    FragColor = color;
+}

lineStipple.vs

@@ -0,0 +1,16 @@
+#version 330 core
+layout (location = 0) in vec3 vertices;
+layout (location = 1) in float distances;
+uniform vec4 ourColor;
+
+out float dist;
+out vec4 color;
+
+uniform mat4 MVP;
+
+void main()
+{
+    dist = distances;
+    gl_Position = MVP * vec4(vertices,1.0);
+    color = ourColor;
+}

target.fs

@@ -3,6 +3,9 @@ uniform sampler2D texture;
 varying vec2 vTexCoord;                                                         
 varying vec3 color;                                                            
 void main()                                                                
-{                                                                        
-   gl_FragColor = vec4(color.x,color.y,color.z,texture2D(texture, vTexCoord).w);
+{                                               
+   if(texture2D(texture, vTexCoord).w == 0)
+      discard;
+                               
+   gl_FragColor = vec4(color.x,color.y,color.z,1);
 }