CCEffect %{
  techniques:
  - passes:
    - vert: title-shine-vs
      frag: title-shine-fs
      blendState:
        targets:
        - blend: true
          blendSrc: src_alpha
          blendDst: one_minus_src_alpha
      rasterizerState:
        cullMode: none
      depthStencilState:
        depthTest: false
        depthWrite: false
      properties:
        texture: { value: white }
        shinePosition: { value: -0.3 }
        shineWidth: { value: 0.13 }
        shineStrength: { value: 1.8 }
        shineAngle: { value: 0.2 }
        shineColor: { value: [1.0, 0.95, 0.68, 1.0] }
}%

CCProgram title-shine-vs %{
  precision highp float;
  #include <cc-global>
  #include <cc-local>

  in vec3 a_position;
  in vec4 a_color;
  in vec2 a_uv0;
  out vec4 v_color;
  out vec2 v_uv0;

  void main () {
    vec4 pos = vec4(a_position, 1.0);
    #if CC_USE_MODEL
      pos = cc_matViewProj * cc_matWorld * pos;
    #else
      pos = cc_matViewProj * pos;
    #endif
    gl_Position = pos;
    v_color = a_color;
    v_uv0 = a_uv0;
  }
}%

CCProgram title-shine-fs %{
  precision highp float;
  #include <alpha-test>
  #include <texture>

  in vec4 v_color;
  in vec2 v_uv0;
  uniform sampler2D texture;
  uniform ShineProperties {
    vec4 shineColor;
    float shinePosition;
    float shineWidth;
    float shineStrength;
    float shineAngle;
  };

  void main () {
    vec4 color = vec4(1.0);
    CCTexture(texture, v_uv0, color);
    color *= v_color;

    float sweepAxis = v_uv0.x + (v_uv0.y - 0.5) * shineAngle;
    float bandIn = smoothstep(
      shinePosition - shineWidth,
      shinePosition,
      sweepAxis
    );
    float bandOut = 1.0 - smoothstep(
      shinePosition,
      shinePosition + shineWidth,
      sweepAxis
    );
    float shine = pow(clamp(bandIn * bandOut, 0.0, 1.0), 1.35);
    color.rgb += shineColor.rgb * shine * shineStrength * color.a;

    ALPHA_TEST(color);
    #if USE_BGRA
      gl_FragColor = color.bgra;
    #else
      gl_FragColor = color.rgba;
    #endif
  }
}%