#define LineTypeSolid 0.0
#define LineTypeDash 1.0
#define Animate 0.0
#define LineTexture 1.0

uniform float u_opacity;
uniform float u_textureBlend;
uniform float u_blur : 0.9;
uniform float u_line_type: 0.0;
// varying vec2 v_normal;
varying vec4 v_dash_array;
varying vec4 v_color;

uniform float u_line_texture: 0.0;
uniform sampler2D u_texture;
uniform vec2 u_textSize;
varying float v_segmentIndex;
uniform float segmentNumber;

varying vec2 v_iconMapUV;

uniform float u_time;
uniform vec4 u_animate: [ 1., 2., 1.0, 0.2 ];

varying mat4 styleMappingMat;

#pragma include "picking"

void main() {
  float opacity = styleMappingMat[0][0];
  float animateSpeed = 0.0; // 运动速度
  float d_distance_ratio = styleMappingMat[3].g; // 当前点位距离占线总长的比例
  gl_FragColor = v_color;

  gl_FragColor.a *= opacity;
  if(u_line_type == LineTypeDash) {
    float flag = 0.;
    float dashLength = mod(d_distance_ratio, v_dash_array.x + v_dash_array.y + v_dash_array.z + v_dash_array.w);
    if(dashLength < v_dash_array.x || (dashLength > (v_dash_array.x + v_dash_array.y) && dashLength <  v_dash_array.x + v_dash_array.y + v_dash_array.z)) {
      flag = 1.;
    }
    gl_FragColor.a *=flag;
  }

  if(u_animate.x == Animate && u_line_texture != LineTexture) {
      animateSpeed = u_time / u_animate.y;
      float alpha =1.0 - fract( mod(1.0- d_distance_ratio, u_animate.z)* (1.0/ u_animate.z) + u_time / u_animate.y);

      alpha = (alpha + u_animate.w -1.0) / u_animate.w;
      // alpha = smoothstep(0., 1., alpha);
      alpha = clamp(alpha, 0.0, 1.0);
      gl_FragColor.a *= alpha;

      // u_animate 
      // x enable
      // y duration
      // z interval
      // w trailLength
  }

  if(u_line_texture == LineTexture && u_line_type != LineTypeDash) { // while load texture
    // float arcRadio = smoothstep( 0.0, 1.0, (v_segmentIndex / segmentNumber));
    float arcRadio = v_segmentIndex / (segmentNumber - 1.0);
    float count = styleMappingMat[3].b; // // 贴图在弧线上重复的数量

    float time = 0.0;
    if(u_animate.x == Animate) {
      time = u_time / u_animate.y;
    }
    float redioCount = arcRadio * count;

    float u = fract(redioCount - time);

    float v = styleMappingMat[3].a;  // 线图层贴图部分的 v 坐标值
    vec2 uv= v_iconMapUV / u_textSize + vec2(u, v) / u_textSize * 64.;
    vec4 pattern = texture2D(u_texture, uv);

    if(u_animate.x == Animate) {
      float currentPlane = floor(redioCount - time);
      float textureStep = floor(count * u_animate.z);
      float a = mod(currentPlane, textureStep);
      if(a < textureStep - 1.0) {
        pattern = vec4(0.0);
      }
    }

    if(u_textureBlend == 0.0) { // normal
      pattern.a = 0.0;
      gl_FragColor = filterColor(gl_FragColor + pattern);
    } else { // replace
        pattern.a *= opacity;
        if(gl_FragColor.a <= 0.0) {
          pattern.a = 0.0;
          discard;
        } else {
          gl_FragColor = filterColor(pattern);
        }
    }

  } else {
    gl_FragColor = filterColor(gl_FragColor);
  }
}