RetroArch Pack

system/PPSSPP/shaders/sharpen.fsh

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+// Simple sharpen shader; created to use in PPSSPP
+
+#ifdef GL_ES
+precision mediump float;
+precision mediump int;
+#endif
+
+uniform sampler2D sampler0;
+varying vec2 v_texcoord0;
+
+float amount = 1.5;
+
+void main()
+{
+  vec3 color = texture2D(sampler0, v_texcoord0.xy).xyz;
+  color -= texture2D(sampler0, v_texcoord0.xy+0.0001).xyz*7.0*amount;
+  color += texture2D(sampler0, v_texcoord0.xy-0.0001).xyz*7.0*amount;
+  gl_FragColor.rgb = color;
+}