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// Effect Syntax Guide: https://docs.cocos.com/creator/manual/zh/shader/index.html

CCEffect %{
  techniques:
  - name: glow
    passes:
    - vert: vs:vert

      frag: fs:frag
      blendState:
        targets:

        - blend: true


          blendSrc: src_alpha

          blendDst: one_minus_src_alpha
      depthStencilState:      

          depthTest: false  
          depthWrite: false 

      rasterizerState:

        cullMode: none
      properties:
        lightColor: { value: [1.0, 0.0, 0.0, 1.0], editor: { type: color } }

        lightIntensity: { value: 3.0, editor: { slide: true, range: [1, 10] } }

        glowsize: { value: 0.0, editor: { slide: true, range: [0, 10] } }
        pulseSpeed: { value: 2.0, editor: { slide: true, range: [0, 17] } }
        isBlinking: { value: 0, editor: { type: boolean } }
}%

CCProgram vs %{
  precision highp float;
#include <cc-global>
#if USE_LOCAL



  #include <builtin/uniforms/cc-local>
#endif
in vec3 a_position;

in vec2 a_texCoord;   
out vec2 uv;

#if USE_LOCAL
  in vec4 a_color; 

  out vec4 v_color; 
#endif


vec4 vert() {

  vec4 pos = vec4(a_position, 1);

  #if USE_LOCAL
    pos = cc_matWorld * pos; 

    v_color = a_color;
  #endif

  pos = cc_matViewProj * pos;
  uv = a_texCoord;
  
  return  pos;
}

}%

CCProgram fs %{
  precision highp float;
  #include <sprite-texture>
  #include <cc-global> // 添加cc_time支持
  in vec2 uv;

  uniform sampler2D mainTexture;
  uniform UBO {

    vec4 lightColor;
    float lightIntensity;
    float pulseSpeed;
    float time;
    float isBlinking;
    float glowsize;
  };


  vec4 frag () {
    vec4 texColor = texture(cc_spriteTexture, uv);
    
    // 简单条件：只要glowsize大于0就发光
    if (glowsize > 0.5) {
        // ========== 快速闪烁逻辑 ==========
        // 每秒闪5次（亮5次暗5次）
        float flashRate = pulseSpeed;
        
        // 计算时间：比如cc_time.x=3.2秒
        float currentTime = cc_time.x;
        
        // 关键判断：通过正弦波判断现在是亮还是暗
        // sin(值) 的结果在-1到1之间变化
        // 当结果>0时，我们认为是"亮"
        if (sin(currentTime * flashRate) > 0.0) {
            // 现在是"亮"的时候：纯白色
            return vec4(1.0, 1.0, 1.0, texColor.a);
    }else{
      return texColor;
    }
    
    // 不闪的时候或没开启效果：返回原图

    
  }

     return texColor;
  
  }

}%