Open source Star Ruler 2 source code!

data/shaders/source/fs_menu_save_ps.txt

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+#version 120
+uniform sampler2D screen;
+varying vec2 uv;
+
+const float blurStep = 0.001;
+const vec3 gray = vec3(0.50, 0.50, 0.50);
+const float desaturateLevel = 0.6;
+
+void main()
+{
+	//Blur the pixel
+	vec4 color = texture2D(screen, uv);
+	color += texture2D(screen, uv + vec2(-blurStep, -blurStep));
+	color += texture2D(screen, uv + vec2(0, -blurStep));
+	color += texture2D(screen, uv + vec2(+blurStep, -blurStep));
+
+	color += texture2D(screen, uv + vec2(-blurStep, 0));
+	color += texture2D(screen, uv + vec2(+blurStep, 0));
+
+	color += texture2D(screen, uv + vec2(-blurStep, +blurStep));
+	color += texture2D(screen, uv + vec2(0, +blurStep));
+	color += texture2D(screen, uv + vec2(+blurStep, +blurStep));
+	color /= 9.0;
+
+	//Desaturate the pixel
+	color.rgb = mix(vec3(dot(gray, color.rgb)), color.rgb, desaturateLevel);
+
+	//Darkened edge
+	float dist = length(uv - vec2(0.5, 0.5));
+	if(dist > 0.4)
+		color.rgb = mix(color.rgb, vec3(0.0, 0.0, 0.0), (dist - 0.4)/0.3);
+
+	gl_FragColor = color * gl_Color;
+}