// Eazax-CCC 头像（圆形） 1.0.0.20200522
// https://gitee.com/ifaswind/eazax-ccc/blob/master/resources/effects/eazax-avatar-circle.effect

CCEffect %{
  techniques:
  - passes:
    - vert: vs
      frag: fs
      blendState:
        targets:
        - blend: true
      rasterizerState:
        cullMode: none
      properties:
        feather: { value: 0.01, editor: { tooltip: '边缘虚化（百分比）' } }
}%


CCProgram vs %{
  precision highp float;

  #include <cc-global>

  in vec3 a_position;
  in vec2 a_uv0;
  in vec4 a_color;

  out vec2 v_uv0;
  out vec4 v_color;

  void main () {
    gl_Position = cc_matViewProj * vec4(a_position, 1);
    v_uv0 = a_uv0;
    v_color = a_color;
  }
}%


CCProgram fs %{
  precision highp float;

  in vec2 v_uv0;
  in vec4 v_color;

  uniform sampler2D texture;

  uniform Properties {
    float feather;
  };

  void main () {
    vec4 color = v_color;
    color *= texture(texture, v_uv0);

    if (color.a == 0.0) discard;
    
    float dis = distance(vec2(v_uv0.x, v_uv0.y), vec2(0.5, 0.5));
    color.a = smoothstep(0.5, 0.5 - feather, dis);

    color.a *= v_color.a;
    gl_FragColor = color;
  }
}%