ProjectArcade

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// Simple false color shader
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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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void main() {
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  vec3 rgb = texture2D(sampler0, v_texcoord0.xy).xyz;
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  float luma = dot(rgb, vec3(0.299, 0.587, 0.114));
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  vec3 gray = vec3(luma, luma, luma) - 0.5;
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  rgb -= vec3(0.5, 0.5, 0.5);
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  gl_FragColor.rgb = mix(rgb, gray, 2.0) + 0.5;
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  gl_FragColor.a = 1.0;
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}
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