AllColors.frag

#ifdef GL_ES
precision mediump float;
#endif

uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_time;

const float PI = 3.14159;

float gradient (float point,float x1, float x2){
    return ((point - x1) / (x2 - x1));
}

bool liesIn(float x, float left, float right){
    return ((x >= left) && (x <= right));
}

void main() {
    vec2 st,res = u_resolution, coord = gl_FragCoord.xy;
    float   R = 0.0,
            G = 0.0,
            B = 0.0,
            yGradient,
            oneThirdResX = res.x/3.0, oneSixthResX = res.x/6.0, sinTime = sin(u_time);
    vec3 color;

    if(liesIn(coord.x, 0.0, oneSixthResX)){                         //1st segment
        R = 1.0;
        G = gradient(coord.x,0.0,oneSixthResX);
        B = 0.0;
    }
    else if(liesIn(coord.x, oneSixthResX, 2.0*oneSixthResX)){       //2nd segment
        R = 1.0 - gradient(coord.x, oneSixthResX, 2.0*oneSixthResX);
        G = 1.0;
        B = 0.0;
    }
    else if(liesIn(coord.x, 2.0*oneSixthResX, 3.0*oneSixthResX)){   //3rd segment
        R = 0.0;
        G = 1.0;
        B = gradient(coord.x, 2.0*oneSixthResX, 3.0*oneSixthResX);
    }
    else if(liesIn(coord.x, 3.0*oneSixthResX, 4.0*oneSixthResX)){   //4th segment
        R = 0.0;
        G = 1.0 - gradient(coord.x, 3.0*oneSixthResX, 4.0*oneSixthResX);
        B = 1.0;
    }
    else if(liesIn(coord.x, 4.0*oneSixthResX, 5.0*oneSixthResX)){   //5th segment
        R = gradient(coord.x, 4.0*oneSixthResX, 5.0*oneSixthResX);
        G = 0.0;
        B = 1.0;
    }
    else if(liesIn(coord.x, 5.0*oneSixthResX, 6.0*oneSixthResX)){   //6th segment
        R = 1.0;
        G = 0.0;
        B = 1.0 - gradient(coord.x, 5.0*oneSixthResX, 6.0*oneSixthResX);
    }

    sinTime = (sinTime+1.0)/2.0 + 1.0;

    yGradient = (coord.y/(res.y));
    R = mix(R,yGradient,sinTime);
    G = mix(G,yGradient,sinTime);
    B = mix(B,yGradient,sinTime);

    color = vec3(R,G,B);
    gl_FragColor = vec4(color,1.0);
}