cocos-creator-template/assets/chunks/common/texture/texture-misc.chunk

// for exr data texture and sub resources
vec3 SampleTextureExr(sampler2D exrRGBE, vec2 uv)
{
  vec3 data = unpackRGBE(texture(exrRGBE, uv));
  return data;
}

vec3 SampleTextureExr(sampler2D exrRGBE, sampler2D exrSign, vec2 uv)
{
  vec3 data = unpackRGBE(texture(exrRGBE, uv));
  vec4 signValue = sign(texture(exrSign, uv) - vec4(0.5));
  return data * signValue.xyz;
}

vec4 SampleTextureExrWithAlpha(sampler2D exrRGBE, sampler2D exrSign, sampler2D exrAlpha, vec2 uv)
{
  vec3 data = unpackRGBE(texture(exrRGBE, uv));
  vec4 alphaTex = texture(exrAlpha, uv);
  float alpha = unpackRGBE(alphaTex).x;

  vec4 signValue = sign(texture(exrSign, uv) - vec4(0.5));
  return vec4(data, alpha) * signValue;
}