ProjectArcade

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// Simple vignette shader - darker towards the corners like in the unprocessed output of a real camera.
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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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  vec2 diff = v_texcoord0 - 0.5;
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  diff.x *= u_setting.y;
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  diff.y /= u_setting.y;
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  float vignette = 1.0 - min(1.0, u_setting.x * (dot(diff, diff) * 2.0));
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  vec3 rgb = texture2D(sampler0, v_texcoord0.xy).xyz;
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  rgb *= vignette;
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  gl_FragColor.rgb = vignette * rgb;
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  gl_FragColor.a = 1.0;
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}
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