// 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。
%{
  techniques: [
    {
      passes: [
        {
          vert: vs
          frag: fs
          cullMode: none
          blend: true
        }
      ]
      layer: 0
    }
  ]
  properties: {
    texture: {
      type: sampler2D
      value: null
    }
    alphaThreshold: {
      type: number
      value: 0.5
    }
  }
%}

%% vs {

precision highp float;

uniform mat4 cc_matViewProj;

#if _USE_MODEL
  uniform mat4 cc_matWorld;
#endif

attribute vec3 a_position;
attribute lowp vec4 a_color;
#if USE_TINT
  attribute lowp vec4 a_color0;
#endif

attribute mediump vec2 a_uv0;
varying mediump vec2 v_uv0;

varying lowp vec4 v_light;
#if USE_TINT
  varying lowp vec4 v_dark;
#endif

void main () {
  mat4 mvp;
  
  #if _USE_MODEL
    mvp = cc_matViewProj * cc_matWorld;
  #else
    mvp = cc_matViewProj;
  #endif

  v_uv0 = a_uv0;

  v_light = a_color;
  #if USE_TINT
    v_dark = a_color0;
  #endif

  gl_Position = mvp * vec4(a_position, 1);
}

}

%% fs {

precision highp float;

uniform sampler2D texture;
varying mediump vec2 v_uv0;

#include <alpha-test>

varying lowp vec4 v_light;
#if USE_TINT
  varying lowp vec4 v_dark;
#endif

void main () {
  vec4 texColor = texture2D(texture, v_uv0);
  #if _USE_ETC1_TEXTURE
      texColor.a *= texture2D(texture, v_uv0 + vec2(0, 0.5)).r;
  #endif
  vec4 finalColor;

  #if USE_TINT
    finalColor.a = v_light.a * texColor.a;
    finalColor.rgb = ((texColor.a - 1.0) * v_dark.a + 1.0 - texColor.rgb) * v_dark.rgb + texColor.rgb * v_light.rgb;
  #else
    finalColor = texColor * v_light;
  #endif

  ALPHA_TEST(finalColor);

  gl_FragColor = finalColor;
}

}