Adding missing star shader

Author: Interrupt

Diff for: shaders/star.frag

@@ -0,0 +1,17 @@
+#version 120
+
+varying vec2 TexCoords;
+varying float Light;
+
+uniform sampler2D tex;
+
+void main() {
+    vec4 t = texture2D(tex, gl_PointCoord);
+    vec2 mid = vec2(0.5, 0.5) - gl_PointCoord;
+
+    float dist = 0.5 - length(mid);
+    dist *= 3.0;
+    dist = min(dist, 1.0);
+
+    gl_FragColor = vec4(dist * t.r * Light, dist * t.g * Light, dist * t.b * Light, t.a);
+}