ProjectArcade

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