the first
- (GLuint) createTexture{
   GLuint _texture;//創(chuàng)建對象
   glActiveTexture(GL_TEXTURE1);//激活紋理單元1
   glGenTextures(1, &_texture);//生成紋理對象
   glBindTexture(GL_TEXTURE_2D, _texture);//采樣紋理對象
   
    //設(shè)置紋理屬性
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    return _texture;
}
the second
- (GLuint)createTexture{
   //創(chuàng)建紋理對象
   GLuint  _texture;
   //激活紋理單元
   glActiveTexture(GL_TEXTURE1);
  //生成紋理對象
  glGenTexture(1, &_texture);
  //采樣紋理對象
  glBindTexture(GL_TEXTURE_2D, _texture)；

  //設(shè)置紋理屬性
  glTexParameteri(GL_TEXTURE_2D,  GL_TEXTURE_MIN_FILTER, GL_LINERA);//線性插值
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINERA);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  g lTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
   //返回生成紋理  
  return _texture;
}