precision highp float;
varying highp vec2 uv0;
varying highp vec4 v_color;
varying highp vec4 v_bloomPara;
varying highp vec4 v_bloomPara2;
uniform sampler2D _MainTex;
uniform float u_Strength;
uniform float sizeScale;
uniform vec2 u_Center;
uniform float u_light;
uniform float test;
uniform float blurscale;
uniform vec4 u_ScreenParams;

vec3 rgb2hsv(vec3 c)
{
    vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
    vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));
    vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));

    float d = q.x - min(q.w, q.y);
    float e = 1.0e-10;
    return vec3(abs(q.z +  (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);
}

vec3 ChangeHue(vec3 col, float h){
    float shift = 2.0*h*3.1415926535;
    vec3 m = vec3(cos(shift), -sin(shift) * .57735, 0);
    m = vec3(m.xy, -m.y) + (1. - m.x) * .33333;
    return mat3(m, m.zxy, m.yzx) * col;
}

vec3 hsv2rgb(vec3 c)
{
    vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
    vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
    return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
}

vec4 radialBlur(sampler2D i_InputTexture, vec2 uv, float i_Strength, vec2 i_Center, float i_light, float i_enableColorCustomized)
{
    float decay = 0.9;
    float density = i_Strength;
    float weight = 0.58767;
    const int nsamples = 64;

    vec2 tc = uv.xy;
    vec2 deltaTexCoord = tc - i_Center.xy;

    float blurstep = blurscale;
    if(blurstep<1.0){
        blurstep = 1.0;
    }
    
    deltaTexCoord *= (1.0 / float(nsamples) * density)*1.60;
    float illuminationDecay = 1.0;
    float sumweight = 0.0;
    vec4 color = vec4(0.0);
	float lightStrength = 0.1;
    tc += deltaTexCoord * (fract( sin(dot(uv.xy, vec2(12.9898, 78.233)))* 43758.5453 ));
    for (int i = 0; i < nsamples; i++)
	{
        tc -= deltaTexCoord;
        vec4 sampl = texture2D(i_InputTexture, tc.xy) * lightStrength;
        sampl *= illuminationDecay * weight;
        color += sampl;
        sumweight += illuminationDecay * weight * lightStrength;
        illuminationDecay *= decay;
    }
    vec4 oriColor = texture2D(i_InputTexture, uv.xy) * 0.7;
    oriColor.rgb = rgb2hsv(oriColor.rgb);
    oriColor.g *= 0.75;
    oriColor.b *= 1.4;
    oriColor.rgb = hsv2rgb(oriColor.rgb);
    if (i_enableColorCustomized > 0.5)
    {
        color.rgb = v_color.rgb * color.a * v_color.a;
    }
    color = clamp(i_light*pow(color,vec4(1.0/(0.01+i_light))), 0.0, 1.0);
    return oriColor + color / sumweight * 1.0 * (1. - clamp(oriColor.a, 0.0, 1.0)) * i_Strength;
}

void main()
{
    float range = pow(v_bloomPara.y,0.2);
    float light = pow(v_bloomPara.x,0.2)*1.5;
    float dirX = 1.0-v_bloomPara.z;
    float dirY = 1.0-v_bloomPara.w;
    float enableColorCustomized = v_bloomPara2.x;
    range = range ;
    // gl_FragColor = vec4(1.0);
    //gl_FragColor = radialBlur(_MainTex, uv0, u_Strength * 0.75, u_Center);
    gl_FragColor = radialBlur(_MainTex, uv0, range , vec2(dirX,dirY), light, enableColorCustomized);
    // gl_FragColor = vec4(test);
}