ProjectArcade

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// Advanced Scanlines (CRT) shader, created to use in PPSSPP.
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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 vec2 v_texcoord0;
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uniform vec4 u_setting;
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void main()
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{
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  float pos0 = ((v_texcoord0.y + 1.0) * 170.0*u_setting.x);
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  float pos1 = cos((fract( pos0 ) - 0.5)*3.1415926*u_setting.y)*1.5;
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  vec4 rgb = texture2D( sampler0, v_texcoord0 );
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  // slight contrast curve
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  vec4 color = rgb*0.5+0.5*rgb*rgb*1.2;
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  // color tint
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  color *= vec4(0.9,1.0,0.7, 0.0);
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  // vignette
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  color *= 1.1 - 0.6 * (dot(v_texcoord0 - 0.5, v_texcoord0 - 0.5) * 2.0);
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  gl_FragColor.rgba = mix(vec4(0,0,0,0), color, pos1);
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}
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