// Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.  

// Note: Current format version is experiment, the format may be changed.
// The future format may not be compatible, you may need to update the script manually.

// 注意：当前版本的格式是实验性的，之后还会进行修改。
// 后续版本的格式不保证兼容当前格式，可能需要手动升级到最新版本。，
CCEffect %{
  techniques:
  - passes:
    - vert: vs
      frag: fsBack
      blendState:
        targets:
        - blend: true
      rasterizerState:
        cullMode: back
      properties:
        textureBack: { value: white }
        textureFront: { value: white }
        ratio: { value: 0 }
        radius: { value: 0 }
        width: { value: 0 }
        height: { value: 0 }
        offx: { value: 0 }
        offy: { value: 0 }
        rotation: { value: 0 }
    - vert: vs
      frag: fsFront
      blendState:
        targets:
        - blend: true
      rasterizerState:
        cullMode: front
      properties:
        textureBack: { value: white }
        textureFront: { value: white }
        ratio: { value: 0 }
        radius: { value: 0 }
        width: { value: 0 }
        height: { value: 0 }
        offx: { value: 0 }
        offy: { value: 0 }
        rotation: { value: 0 }
}%

CCProgram vs %{

precision highp float;

#include <cc-global>
#include <cc-local>

in vec3 a_position;

in mediump vec2 a_uv0;
out mediump vec2 v_uv0;

uniform RATIO {
  float ratio;
  float radius;
  float width;
  float height;
  float offx;
  float offy;
  float rotation;
};

void main () {
  mat4 mvp;
  
  mvp = cc_matViewProj;

  v_uv0 = vec2(1.0 - a_uv0.x,1.0 - a_uv0.y);

  vec4 tmp_pos = vec4(a_position.x, a_position.y, 0.0, 1.0);
  float halfPeri = radius * 3.14159; 
  float hr = width * ratio;
  if(hr > 0.0 && hr <= halfPeri){
      if(tmp_pos.x < hr){
         float rad = hr/ 3.14159;
         float arc = (hr-tmp_pos.x)/rad;
         tmp_pos.x = hr - sin(arc)*rad;
         tmp_pos.z = rad * (1.0-cos(arc)); 
      }
  }
  if(hr > halfPeri){
      float straight = (hr - halfPeri)/2.0;
      if(tmp_pos.x < straight){
          tmp_pos.x = hr  - tmp_pos.x;
          tmp_pos.z = radius * 2.0; 
      }
      else if(tmp_pos.x < (straight + halfPeri)) {
          float dy = halfPeri - (tmp_pos.x - straight);
          float arc = dy/radius;
          tmp_pos.x = hr - straight - sin(arc)*radius;
          tmp_pos.z = radius * (1.0-cos(arc)); 
      }
  }
  float x1 = tmp_pos.x;
  float z1 = tmp_pos.z;
  float x2 = width;
  float z2 = 0.0;
  float sinRat = sin(rotation);
  float cosRat = cos(rotation);
  tmp_pos.x=(x1-x2)*cosRat-(z1-z2)*sinRat+x2;
  tmp_pos.z=(z1-z2)*cosRat+(x1-x2)*sinRat+z2;
  tmp_pos.x = tmp_pos.x - width/2.0*(1.0-cosRat);
  tmp_pos += vec4(offx, offy, 0.0, 0.0);
  gl_Position = mvp * tmp_pos;
}

}%

CCProgram fsBack %{

precision highp float;
uniform sampler2D textureBack;
uniform sampler2D textureFront;
varying mediump vec2 v_uv0;

void main () {
  vec4 color = vec4(1.);
  color *= texture2D(textureBack, v_uv0);
  gl_FragColor = color;
}

}%

CCProgram fsFront %{

precision highp float;
uniform sampler2D textureBack;
uniform sampler2D textureFront;
varying mediump vec2 v_uv0;

void main () {
  vec4 color = vec4(1.);
  color *= texture2D(textureFront, v_uv0);
  gl_FragColor = color;
}

}%