RetroArch Pack

system/PPSSPP/shaders/natural.fsh

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+// Natural Vision Shader, modified to use in PPSSPP.
+
+// by ShadX (Modded by SimoneT)
+// http://forums.ngemu.com/showthread.php?t=76098
+
+#ifdef GL_ES
+precision mediump float;
+precision mediump int;
+#endif
+
+uniform sampler2D sampler0;
+varying vec4 v_texcoord0;
+varying vec4 v_texcoord1;
+varying vec4 v_texcoord2;
+varying vec4 v_texcoord3;
+
+const mat3 RGBtoYIQ = mat3(0.299, 0.596, 0.212, 
+                           0.587,-0.275,-0.523, 
+                           0.114,-0.321, 0.311);
+
+const mat3 YIQtoRGB = mat3(1.0, 1.0, 1.0,
+                           0.95568806036115671171,-0.27158179694405859326,-1.1081773266826619523,
+                           0.61985809445637075388,-0.64687381613840131330, 1.7050645599191817149);
+
+const vec3 val00 = vec3( 1.2, 1.2, 1.2);
+
+void main()
+{
+vec3 c0,c1;
+
+c0 = texture2D(sampler0,v_texcoord0.xy).xyz;
+c0+=(texture2D(sampler0,v_texcoord0.zy).xyz)*0.25;
+c0+=(texture2D(sampler0,v_texcoord0.xw).xyz)*0.25;
+c0+=(texture2D(sampler0,v_texcoord0.zw).xyz)*0.125;
+
+c0+= texture2D(sampler0,v_texcoord1.xy).xyz;
+c0+=(texture2D(sampler0,v_texcoord1.zy).xyz)*0.25;
+c0+=(texture2D(sampler0,v_texcoord1.xw).xyz)*0.25;
+c0+=(texture2D(sampler0,v_texcoord1.zw).xyz)*0.125;
+
+c0+= texture2D(sampler0,v_texcoord2.xy).xyz;
+c0+=(texture2D(sampler0,v_texcoord2.zy).xyz)*0.25;
+c0+=(texture2D(sampler0,v_texcoord2.xw).xyz)*0.25;
+c0+=(texture2D(sampler0,v_texcoord2.zw).xyz)*0.125;
+
+c0+= texture2D(sampler0,v_texcoord3.xy).xyz;
+c0+=(texture2D(sampler0,v_texcoord3.zy).xyz)*0.25;
+c0+=(texture2D(sampler0,v_texcoord3.xw).xyz)*0.25;
+c0+=(texture2D(sampler0,v_texcoord3.zw).xyz)*0.125;
+c0*=0.153846153846;
+
+c1=RGBtoYIQ*c0;
+
+c1=vec3(pow(c1.x,val00.x),c1.yz*val00.yz);
+
+gl_FragColor.rgb=YIQtoRGB*c1;
+gl_FragColor.a = 1.0;
+}