Description of problem:
When displaying remote OpenGL applications (using DISPLAY environment variables) from a big-endian system to a Linux system using FGLRX driver (tested on 10.7 to 12.3) and X.org x server (tested on xserver releases 1.6 to 1.12), the sequence numbers applied to the GLX replies are badly byte-swapped. All the GLXGet[Float|Integer|...][v]() methods on (from the libglx.so file) seem to swap the X.org internal sequence number (which is an integer) as a 16 bit short without masking it with 0xFFFF. This results in all replies sent after the 65635th having wrong sequence numbers.
The following behavior is observed : the sequence numbers from 0x0 to 0xFFFF are correctly swapped, i.e. 0x1234 -> 0x3412, but once 0x10000 is reached the bits matching the 0xFF0000 mask are binary-or'd with the ones matching the 0xFF mask, i.e. 0x12345 -> 0x4623 (instead of 0x4523).
The exact same behavior can be observed using X.org's libglx.so, where the issue can be found in src/glx/indirect_util.c where the __glXSendReplySwap() method does a "bswap16( client->sequence )" (line 176 in current X.org git) while it should do "bswap16( client->sequence & 0xFFFF )". I hope it helps fix the issue in the fglrx source tree.
Steps to reproduce:
1. Run an openGL application from a big-endian system (Solaris/SPARC here), with DISPLAY set to a linux X.org server with ATI (or now AMD) graphics adapter with FGLRX driver in use.
2. Use a tool like wireshark or tcpdump to observe the GLX replies sent by the X.org server to the client.
3. Manipulate the OpenGL application so that it sends more than 65635 GLX requests (resizing the window seems to trigger a lot of these, when window manager is configured to keep drawing the client while resizing its window)
The sequence numbers field of the replies is not increasing in a linear way after the 65635th one (0x0000, 0x0001 ... 0xFFFF, 0x0100, 0x0200).
The sequence numbers shall always increase linearily, rolling back to 0 after the 65635th one (0x0000, 0x0001 ... 0xFFFF, 0x0000, 0x0001)
Matching X.org/xserver/GLX bug created : https://bugs.freedesktop.org/show_bug.cgi?id=49166
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