bool COpenGLES::CreatePNGTexture(GLuint texID, const CString filename)
{
    printf("png图片路径=%s\n",filename);
 
    CxImage * image = new CxImage();
    image->Destroy();
    unsigned char *pImage_RGBA = NULL;
    if(!(image->Load(filename,CXIMAGE_FORMAT_PNG)))
    {
        printf("加载图片失败\n");
        return false;
    }
    if(!image->IsValid())
    {
        printf("图片不可用\n");
        return false;
    }
    int sizeX,sizeY;
    sizeX = image->GetWidth();
    sizeY = image->GetHeight();
    if(!image->AlphaIsValid())
    {
        printf("alpha层错误\n");
        return false;
    }
    long imageSize_RGBA = sizeX * sizeY * 4;
    //pImage_RGBA = new unsigned char[imageSize_RGBA];
    image->Encode2RGBA(pImage_RGBA,imageSize_RGBA);
    glBindTexture(GL_TEXTURE_2D, texID);
 
    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, sizeX, sizeY, 0, GL_RGBA, GL_UNSIGNED_BYTE, pImage_RGBA);
    image->FreeMemory( pImage_RGBA);
    image->Destroy();
    delete image;
 
}