ProjectArcade

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// 4xGLSL HqFilter shader, Modified to use in PPSSPP. Grabbed from:
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// http://forums.ngemu.com/showthread.php?t=76098
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// by guest(r) (guest.r@gmail.com)
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// License: GNU-GPL
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// Shader notes: looks better with sprite games
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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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varying vec4 v_texcoord0;
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varying vec4 v_texcoord1;
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varying vec4 v_texcoord2;
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varying vec4 v_texcoord3;
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varying vec4 v_texcoord4;
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varying vec4 v_texcoord5;
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varying vec4 v_texcoord6;
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const float mx = 0.325;    // start smoothing factor
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const float k = -0.250;    // smoothing decrease factor
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const float max_w = 0.25;  // max. smoothing weigth
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const float min_w =-0.05;  // min smoothing/sharpening weigth
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void main()
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{
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  vec3 c  = texture2D(sampler0, v_texcoord0.xy).xyz;
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  vec3 i1 = texture2D(sampler0, v_texcoord1.xy).xyz; 
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  vec3 i2 = texture2D(sampler0, v_texcoord2.xy).xyz; 
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  vec3 i3 = texture2D(sampler0, v_texcoord3.xy).xyz; 
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  vec3 i4 = texture2D(sampler0, v_texcoord4.xy).xyz; 
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  vec3 o1 = texture2D(sampler0, v_texcoord5.xy).xyz; 
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  vec3 o3 = texture2D(sampler0, v_texcoord6.xy).xyz; 
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  vec3 o2 = texture2D(sampler0, v_texcoord5.zw).xyz;
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  vec3 o4 = texture2D(sampler0, v_texcoord6.zw).xyz; 
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  vec3 dt = vec3(1.0,1.0,1.0);
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  float ko1=dot(abs(o1-c),dt);
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  float ko2=dot(abs(o2-c),dt);
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  float ko3=dot(abs(o3-c),dt);
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  float ko4=dot(abs(o4-c),dt);
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  float sd1 = dot(abs(i1-i3),dt);
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  float sd2 = dot(abs(i2-i4),dt);
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  float w1 = step(ko1,ko3)*sd2;
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  float w2 = step(ko2,ko4)*sd1;
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  float w3 = step(ko3,ko1)*sd2;
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  float w4 = step(ko4,ko2)*sd1;
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  c = (w1*o1+w2*o2+w3*o3+w4*o4+0.1*c)/(w1+w2+w3+w4+0.1);
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  float lc = c.r+c.g+c.b+0.2;
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  w1 = (i1.r+i1.g+i1.b+lc)*0.2; 
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  w1 = clamp(k*dot(abs(c-i1),dt)/w1+mx,min_w,max_w);
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  w2 = (i2.r+i2.g+i2.b+lc)*0.2; 
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  w2 = clamp(k*dot(abs(c-i2),dt)/w2+mx,min_w,max_w);
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  w3 = (i3.r+i3.g+i3.b+lc)*0.2;
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  w3 = clamp(k*dot(abs(c-i3),dt)/w3+mx,min_w,max_w);
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  w4 = (i4.r+i4.g+i4.b+lc)*0.2; 
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  w4 = clamp(k*dot(abs(c-i4),dt)/w4+mx,min_w,max_w);
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  gl_FragColor.rgb = w1*i1 + w2*i2 + w3*i3 + w4*i4 + (1.0-w1-w2-w3-w4)*c;
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  gl_FragColor.a = 1.0;
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}
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