RetroArch Pack

system/PPSSPP/shaders/GaussianDownscale.fsh

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+// PPSSPP: Simple Gauss filter
+// Made by Bigpet
+
+#ifdef GL_ES
+precision mediump float;
+precision mediump int;
+#endif
+
+uniform sampler2D sampler0;
+
+// The inverse of the texture dimensions along X and Y
+uniform vec2 u_texelDelta;
+uniform vec2 u_pixelDelta;
+varying vec2 v_texcoord0;
+
+void main() {
+  // The parameters are hardcoded for now, but could be
+  // made into uniforms to control fromt he program.
+  float GAUSS_SPAN_MAX = 1.5;
+
+  //just a variable to describe the maximu
+  float GAUSS_KERNEL_SIZE = 5.0;
+  //indices
+  //  XX XX 00 XX XX
+  //  XX 01 02 03 XX
+  //  04 05 06 07 08
+  //  XX 09 10 11 XX
+  //  XX XX 12 XX XX
+
+  //filter strength, rather smooth 
+  //  XX XX 01 XX XX
+  //  XX 03 08 03 XX
+  //  01 08 10 08 01
+  //  XX 03 08 03 XX
+  //  XX XX 01 XX XX
+
+  vec2 offset = u_pixelDelta*GAUSS_SPAN_MAX/GAUSS_KERNEL_SIZE;
+  
+  vec3 rgbSimple0 =  1.0 * texture2D(sampler0, v_texcoord0.xy + offset * vec2( 0.0,-2.0)).xyz;
+  vec3 rgbSimple1 =  3.0 * texture2D(sampler0, v_texcoord0.xy + offset * vec2(-1.0,-1.0)).xyz;
+  vec3 rgbSimple2 =  8.0 * texture2D(sampler0, v_texcoord0.xy + offset * vec2( 0.0,-1.0)).xyz;
+  vec3 rgbSimple3 =  3.0 * texture2D(sampler0, v_texcoord0.xy + offset * vec2( 1.0,-1.0)).xyz;
+  vec3 rgbSimple4 =  1.0 * texture2D(sampler0, v_texcoord0.xy + offset * vec2(-2.0, 0.0)).xyz;
+  vec3 rgbSimple5 =  8.0 * texture2D(sampler0, v_texcoord0.xy + offset * vec2(-1.0, 0.0)).xyz;
+  vec3 rgbSimple6 = 10.0 * texture2D(sampler0, v_texcoord0.xy + offset * vec2( 0.0, 0.0)).xyz;
+  vec3 rgbSimple7 =  8.0 * texture2D(sampler0, v_texcoord0.xy + offset * vec2( 1.0, 0.0)).xyz;
+  vec3 rgbSimple8 =  1.0 * texture2D(sampler0, v_texcoord0.xy + offset * vec2( 2.0, 0.0)).xyz;
+  vec3 rgbSimple9 =  3.0 * texture2D(sampler0, v_texcoord0.xy + offset * vec2(-1.0, 1.0)).xyz;
+  vec3 rgbSimple10=  8.0 * texture2D(sampler0, v_texcoord0.xy + offset * vec2( 0.0, 1.0)).xyz;
+  vec3 rgbSimple11=  3.0 * texture2D(sampler0, v_texcoord0.xy + offset * vec2( 1.0, 1.0)).xyz;
+  vec3 rgbSimple12=  1.0 * texture2D(sampler0, v_texcoord0.xy + offset * vec2( 0.0, 2.0)).xyz;
+  //vec3 rgbSimple10= vec3(1.0,0.0,0.0);
+  //vec3 rgbSimple11= vec3(1.0,0.0,0.0);
+  //vec3 rgbSimple12= vec3(1.0,0.0,0.0);
+  
+  vec3 rgb =  rgbSimple0 + 
+              rgbSimple1 +
+              rgbSimple2 +
+              rgbSimple3 +
+              rgbSimple4 +
+              rgbSimple5 +
+              rgbSimple6 +
+              rgbSimple7 +
+              rgbSimple8 +
+              rgbSimple9 +
+              rgbSimple10 +
+              rgbSimple11 +
+              rgbSimple12;
+  rgb = rgb / 58.0;
+  gl_FragColor.xyz=rgb;
+  gl_FragColor.a = 1.0;
+}
+