CCEffect %{
  temporaries:
    b1: &b1
      targets:
      - blend: true
        blendSrc: src_alpha
        blendDst: one_minus_src_alpha
        blendSrcAlpha: src_alpha
        blendDstAlpha: one_minus_src_alpha
    d1: &d1 { depthTest: true, depthWrite: false }
    r1: &r1 { cullMode: none }
    p1: &p1
      mainTexture:            { value: white }
      mainTiling_Offset:      { value: [1, 1, 0, 0]  }
      frameTile_velLenScale:  { value: [1, 1, 0, 0]  }
    p2: &p2
      <<: *p1
      tintColor:              { value: [0.5, 0.5, 0.5, 0.5], editor: { type: color } }

  techniques:
  - name: add
    passes:
    - vert: builtin/internal/particle-trail:vs_main
      frag: tinted-fs:add
      rasterizerState: *r1
      depthStencilState: *d1
      blendState: *b1
      properties: *p2
    - vert: builtin/internal/particle-trail:vs_main
      frag: tinted-fs:add
      phase: deferred-forward
      rasterizerState: *r1
      depthStencilState: *d1
      blendState: *b1
      propertyIndex: 0
}%

// TODO: soft particle

CCProgram tinted-fs %{
  precision mediump float;
  #include <legacy/output>
  #include <builtin/internal/embedded-alpha>

  in vec2 uv;
  in vec4 color;
  #if CC_DRAW_WIRE_FRAME
    in vec3 vBarycentric;
  #endif

  uniform sampler2D mainTexture;
  uniform FragConstants {
    vec4 tintColor;
  };

  vec4 add () {
    vec4 col = 2.0 * color * tintColor * CCSampleWithAlphaSeparated(mainTexture, uv);
#if CC_DRAW_WIRE_FRAME
    if (any(lessThan(vBarycentric, vec3(0.02)))) {
        col = vec4(0., 1., 1., 1.);
    }
#endif
    return CCFragOutput(col);
  }
}%