Announce: sdl-nanox-patch

Hi all,

A patch for SDL-1.2.0 to support Microwindows 0.89pre7 is avaliable.

Please go here to download:


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Patch version 0.8 of SDL(Simple DirectMedia Layer) for Nano-X API

Author: Hsieh-Fu Tsai, clare at

There are two patch files in this package.

  1. The first patch file, nanox.patch, is to fix a bug in Nano-X.
    This patch is proposed by Gary James (gjames at

It fixes the client side GrClose(). In the original version,
GrOpen() can only be called once. When the GrOpen() is called at
the second time, the program will terminate. In order to prevent
this situation, we need to insert “nxSocket = -1” after
"close(nxSocket)" in GrClose(). If you do not have this problem,
you may skip this step.

  1. The second patch file, sdl.patch.0.8, is to enable SDL 1.2.0
    running under Microwindow 0.89pre7.

In this patch, five files are patched in order to insert nano-X
options. They are SDL/, SDL/include/SDL_syswm.h,
SDL/src/video/, SDL/src/video/SDL_sysvideo.h and
SDL/src/video/SDL_video.c. A new directory SDL/src/video/nanox
is created to contain all the necessary video drivers for nano-X.

Quick Install

  1. download
  2. copy the tarball file to the directory containing SDL-1.2.0
    source codes.
  3. tar zxvf sdl-nanox-patch.0.8.tgz
  4. patch -p1 -d SDL-1.2.0 < sdl.patch.0.8
  5. cd SDL-1.2.0
  6. ./
  7. ./configure --disable-video-x11 --disable-video-fbcon \
    –enable-video-nanox \
  8. make clean
  9. make
  10. make install (as root)



If the wrong pixel type is used, the program will crash when the
sub-routine updates the screen. This option depends on SCREEN_PIXTYPE
which is defined in Microwin0.89pre7/src/config. SCREEN_PIXTYPE
is used to define the pixel type in Microwindows/Nano-X.
I only test the program when the pixel type is in “rgb”
(Microwin under X11) or “888” (framebuffer in 24-bit).

–enable-nanox-debug Show debug messages
–enable-nanox-share-memory Use shared-memory to speed up

Some programs can be used to test this patch.

  1. (a tetris-like game)

Todo List

  1. Create hardware surface
  2. Create YUVOverlay on hardware
  3. Use OpenGL
  4. Gamma correction
  5. Hide/Change mouse pointer

Supporting Institutes

Many thanks to go to Setabox Co., Ltd. and CML (Communication and
Multimedia Laboratory, in the
Department of Computer Science and Information Engineering of
National Taiwan University for supporting this porting project.

Contact Information

Welcome to give me any suggestion and to report bugs.
My e-mail address : clare at or niky at

Hi all,

A patch for SDL-1.2.0 to support Microwindows 0.89pre7 is avaliable.
Please go here to download:

Very cool! The SDL part of the patch has been added to SDL in CVS.

-Sam Lantinga, Lead Programmer, Loki Software, Inc.