RetroArch Pack

system/PPSSPP/shaders/grayscale.fsh

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+// Simple grayscale shader
+
+#ifdef GL_ES
+precision mediump float;
+precision mediump int;
+#endif
+
+uniform sampler2D sampler0;
+varying vec2 v_texcoord0;
+
+void main() {
+  vec3 rgb = texture2D(sampler0, v_texcoord0.xy).xyz;
+  float luma = dot(rgb, vec3(0.299, 0.587, 0.114));
+  gl_FragColor.rgb = vec3(luma, luma, luma);
+  gl_FragColor.a = 1.0;
+}