RetroArch Pack

system/PPSSPP/shaders/vignette.fsh

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+// Simple vignette shader - darker towards the corners like in the unprocessed output of a real camera.
+
+#ifdef GL_ES
+precision mediump float;
+precision mediump int;
+#endif
+
+uniform sampler2D sampler0;
+varying vec2 v_texcoord0;
+
+void main() {
+  float vignette = 1.1 - 0.6 * (dot(v_texcoord0 - 0.5, v_texcoord0 - 0.5) * 2.0);
+  vec3 rgb = texture2D(sampler0, v_texcoord0.xy).xyz;
+  gl_FragColor.rgb = vignette * rgb;
+  gl_FragColor.a = 1.0;
+}