🚀 go-pugleaf

Hi.

I'm trying to make a screenshot of the framebuffer content and write it to a
.tga file.

Something is going wrong, because the screenshot is distorted.

Here is what I'm doing:
- To read the framebuffer :
    // w = viewport width
    // h = viewport height
    // buffer is of size 3*w*h
     glReadPixels (0, 0, w, h, GL_RGB, GL_UNSIGNED_BYTE, buffer);

- To write the .tga file:
    1. writing the 18 header bytes:
    //   header[0] = 0;
    //     ....
    //   header[2] = 2;
    //     ....
    //   header[12] = w&255;
    //   header[13] = w>>8;
    //   header[14] = h&255;
    //   header[15] = h>>8;
    //   header[16] = 24;
    //   header[17] = 0;

    2. And then writing the framebuffer content in BGR format
     // before we write we are converting the framebuffer content
     for (i = 0; i < (w*h* 3); i += 3)
     {
          temp = buff[i];
          buff[i] = buff[i + 2];
          buff[i + 2] = temp;
     }

Does anybody know what's wrong here, or can you point me to some samples,
information, etc.

Thanks.
-- Markus