纹理创建

the first
- (GLuint) createTexture{
   GLuint _texture;//创建对象
   glActiveTexture(GL_TEXTURE1);//激活纹理单元1
   glGenTextures(1, &_texture);//生成纹理对象
   glBindTexture(GL_TEXTURE_2D, _texture);//采样纹理对象
   
    //设置纹理属性
    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{
   //创建纹理对象
   GLuint  _texture;
   //激活纹理单元
   glActiveTexture(GL_TEXTURE1);
  //生成纹理对象
  glGenTexture(1, &_texture);
  //采样纹理对象
  glBindTexture(GL_TEXTURE_2D, _texture)；

  //设置纹理属性
  glTexParameteri(GL_TEXTURE_2D,  GL_TEXTURE_MIN_FILTER, GL_LINERA);//线性插值
  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);
   //返回生成纹理  
  return _texture;
}