gistfile1.m

    FILE *fp = fopen([[[NSBundle mainBundle] pathForResource:@"binary"
                                                      ofType:@"buf"]
                                cStringUsingEncoding:NSUTF8StringEncoding],
                     "rb");
    
    unsigned short buffer[512*512] = {0};  /* initialized to zeroes */
    int i;
    unsigned short rs;
    if (fp == NULL) {
        perror("Failed to open file \"myfile\"");
    }
    for (i = 0; (rs = getc(fp)) != EOF && i < 512*512; buffer[i++] = rs)
        ;
    fclose(fp);
    
    glGenTextures(1, &_name);
    GetError();
    glBindTexture(GL_TEXTURE_2D, _tf_texname);
    GetError();
    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);   
    GetError();
    glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 512, 512, 0, GL_ALPHA, GL_UNSIGNED_SHORT, buffer);
    GetError();