write stipple line with shaders

lineStipple.fs

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+#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

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+#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;
+}