precision lowp float;

varying highp vec2 textureCoordinate;
uniform sampler2D inputImageTexture;
uniform sampler2D inputImageTexture2;
uniform sampler2D inputImageTexture3;
uniform sampler2D inputImageTexture4;

void main()
{
    vec4 texel = texture2D(inputImageTexture, textureCoordinate);
    vec3 bbTexel = texture2D(inputImageTexture2, textureCoordinate).rgb;
    texel.r = texture2D(inputImageTexture3, vec2(bbTexel.r, texel.r)).r;
    texel.g = texture2D(inputImageTexture3, vec2(bbTexel.g, texel.g)).g;
    texel.b = texture2D(inputImageTexture3, vec2(bbTexel.b, texel.b)).b;
    vec4 mapped;
    mapped.r = texture2D(inputImageTexture4, vec2(texel.r, .16666)).r;
    mapped.g = texture2D(inputImageTexture4, vec2(texel.g, .5)).g;
    mapped.b = texture2D(inputImageTexture4, vec2(texel.b, .83333)).b;
    mapped.a = 1.0;
    gl_FragColor = mapped;
}