author Sam Lantinga <>
Mon, 02 Jun 2003 14:50:22 +0000
changeset 632 85e104fe14c2
parent 521 136d97397288
child 1131 e044e7c70a50
permissions -rw-r--r--
Date: Sun, 1 Jun 2003 15:38:45 -0700 (PDT)
From: Jeff Brown <>
Subject: [patch] SDL-1.2.5 + FreeBSD joystick axes, hat fixes

Hello again! When I sent in some SDL fixes last December, I found out
they'd already been fixed in the CVS version. This time, I checked the
repository before bugging you. =)

I'm using SDL-1.2.5 on a FreeBSD 4.6.2-RELEASE system, and in the course
of getting my multi-analog-axis USB controller (with a hat switch!)
working with d2x-sdl -- the SDL port of the Descent 2 engine -- I came
across a few problems:

1) The second analog stick is reported as a slider in one direction, and
"Rz" in the other. SDL was ignoring the Rz axis, so I added Rx/Ry/Rz to
the set of things SDL considers to be axes.

2) After the above change, the set of JOYAXE_* axes for my gamepad was
{0,1,3,7}; however, d2x-sdl expects the axes to be contiguously numbered
from 0, which seems like a pretty reasonable expectation, rather than
having to scan the entire space of axes that SDL may or may not have.
So, I added a table lookup which maps the JOYAXE_* axis numbers to 0,1,...
in the order they're detected by SDL_SYS_JoystickOpen(), when reporting
them to the application. I also added a function "usage_to_joyaxe()"
which maps the USB HUG_* usage values to JOYAXE_values, since the repeated
case statements testing for HUG_* were getting out of hand.

3) The BSD joystick driver had no hat support, so I added it. It looks
like our USB library can only support one hat switch per device, which
makes life easy.

The patch against SDL-1.2.5 which implements these changes is at:

After applying, SDL's "testjoystick" reports all activity from my gamepad
correctly, and d2x works too (though it needed some other fixes).

Moving on...

There is also a problem with slightly different USBHID library interfaces
on different versions of FreeBSD. I wasn't going to mention this since the
FreeBSD port for SDL-1.2.5 (and not SDL itself) was doing the FreeBSD
version-specific patching, so I e-mailed the port maintainer with this
change. However, I see that you've incorporated the FreeBSD
version-checking stuff into the CVS version of SDL, so now it's relevant
for you too.

The problem is, the FreeBSD #if tests don't work right for FreeBSD
4.6.2-RELEASE. There may be other versions with this problem, but I've
only tested 4.6.2-R. The following patch against your latest CVS version
fixes this:

--- SDL_sysjoystick.c-1.16 Tue Apr 15 09:02:08 2003
+++ SDL_sysjoystick.c Sun Jun 1 15:10:28 2003
@@ -420,6 +420,8 @@
# else
len = hid_report_size(rd, repinfo[repind].kind, r->rid);
# endif
+# elif (__FreeBSD_version == 460002)
+ len = hid_report_size(rd, r->rid, repinfo[repind].kind);
# else
len = hid_report_size(rd, repinfo[repind].kind, &r->rid);

I hope this is all useful to you. I've been getting myself dizzy playing
Descent 2 with it, all morning!

-Jeff Brown

P.S. My USB controller is a Thrustmaster Firestorm Dual Analog 2. That's
probably irrelevant, but I threw it in for completeness.
     1 <HTML>
     2 	<HEAD>
     3 		<TITLE>Using SDL with Microsoft Visual C++</TITLE>
     4 	</HEAD>
     5 	<BODY>
     6 		<H1>
     7 			Using SDL with Microsoft Visual C++ 5,6&nbsp;and 7
     8 		</H1>
     9 		<H3>
    10 			by <A HREF="">Lion Kimbro </A>and additions by <A HREF="">
    11 				James Turk</A>
    12 		</H3>
    13 		<p>
    14 			You can either use the precompiled libraries from <A HREF="">
    15 				the SDL Download web site </A>, or you can build SDL yourself.
    16 		</p>
    17 		<H3>
    18 			Building SDL
    19 		</H3>
    20 		<P>
    21 			Unzip the <CODE></CODE> file into the directory that contains this 
    22 			file (<CODE>VisualC.html</CODE>). <STRONG><FONT color="#009900">If you are using Visual 
    23 					C++ 7 (.NET) you will need to use the file <code></code></FONT></STRONG>
    24 		</P>
    25 		<P>
    26 			Be certain that you unzip the zip file for your compiler into <strong>this</strong>
    27 			directory and not any other directory. If you are using WinZip, be careful to 
    28 			make sure that it extracts to <strong>this</strong> folder, because it's 
    29 			convenient feature of unzipping to a folder with the name of the file currently 
    30 			being unzipped will get you in trouble if you use it right now. And that's all 
    31 			I have to say about that.
    32 		</P>
    33 		<P>
    34 			Now that it's unzipped, go into the VisualC <STRONG><FONT color="#009900">(VisualC7)</FONT></STRONG>
    35 			directory that is created, and double-click on the VC++ file "<CODE>SDL.dsw</CODE>"<STRONG><FONT color="#009900">
    36 					("<CODE>SDL.sln</CODE>").</FONT></STRONG> This should open up the IDE.
    37 		</P>
    38 		<P>
    39 			You may be prompted at this point to upgrade the workspace, should you be using 
    40 			a more recent version of Visual C++. If so, allow the workspace to be upgraded.
    41 		</P>
    42 		<P>
    43 			Build the <CODE>.dll</CODE> and <CODE>.lib</CODE> files.
    44 		</P>
    45 		<P>
    46 			This is done by right clicking on each project in turn (Projects are listed in 
    47 			the Workspace panel in the FileView tab), and selecting "Build".
    48 		</P>
    49 		<P>
    50 			You may get a few warnings, but you should not get any errors. You do have to 
    51 			have at least the DirectX 5 SDK installed, however. The latest 
    52 			version of DirectX can be downloaded or purchased on a cheap CD (my 
    53 			recommendation) from <A HREF="">Microsoft </A>.
    54 		</P>
    55 		<P>
    56 			Later, we will refer to the following .lib and .dll files that have just been 
    57 			generated:
    58 		</P>
    59 		<ul>
    60     <li> SDL.dll</li>
    61     <li> SDL.lib</li>
    62     <li> SDLmain.lib</li>
    63     </ul>
    64 		<P>
    65 			Search for these using the Windows Find (Windows-F) utility, if you don't 
    66 			already know where they should be. For those of you with a clue, look inside 
    67 			the Debug or Release directories of the subdirectories of the Project folder. 
    68 			(It might be easier to just use Windows Find if this sounds confusing. And 
    69 			don't worry about needing a clue; we all need visits from the clue fairy 
    70 			frequently.)
    71 		</P>
    72 		<H3>
    73 			Creating a Project with SDL
    74 		</H3>
    75 		<P>
    76 			Create a project as a Win32 Application.
    77 		</P>
    78 		<P>
    79 			Create a C++ file for your project.
    80 		</P>
    81 		<P>
    82 			Set the C runtime to "Multi-threaded DLL" in the menu: <CODE>Project|Settings|C/C++ 
    83 				tab|Code Generation|Runtime Library </CODE>.
    84 		</P>
    85 		<P>
    86 			Add the SDL <CODE>include</CODE> directory to your list of includes in the 
    87 			menu: <CODE>Project|Settings|C/C++ tab|Preprocessor|Additional include directories </CODE>
    88 			.
    89 			<br>
    90 			<STRONG><FONT color="#009900">VC7 Specific: Instead of doing this I find it easier to 
    91 					add the include and library directories to the list that VC7 keeps. Do this by 
    92 					selecting Tools|Options|Projects|VC++ Directories and under the "Show 
    93 					Directories For:" dropbox select "Include Files", and click the "New Directory 
    94 					Icon" and add the [SDLROOT]\include directory (ex. If you installed to 
    95 					c:\SDL-1.2.5\ add c:\SDL-1.2.5\include).&nbsp;Proceed to&nbsp;change the 
    96 					dropbox selection to "Library Files" and add [SDLROOT]\lib.</FONT></STRONG>
    97 		</P>
    98 			<P>
    99 				The "include directory" I am referring to is the <CODE>include</CODE> folder 
   100 				within the main SDL directory (the one that this HTML file located within).
   101 			</P>
   102 			<P>
   103 				Now we're going to use the files that we had created earlier in the Build SDL 
   104 				step.
   105 			</P>
   106 			<P>
   107 				Copy the following files into your Project directory:
   108 			</P>
   109 			<ul>
   110      <li> SDL.dll</li>
   111      </ul>
   112 			<P>
   113 				Add the following files to your project (It is not necessary to copy them to 
   114 				your project directory):
   115 			</P>
   116 			<ul>
   117      <li> SDL.lib </li>
   118      <li> SDLmain.lib</li>
   119      </ul>
   120 			<P>
   121 				(To add them to your project, right click on your project, and select "Add 
   122 				files to project")
   123 			</P>
   124 		<P><STRONG><FONT color="#009900">Instead of adding the files to your project it is more 
   125 					desireable to add them to the linker options: Project|Properties|Linker|Command 
   126 					Line and type the names of the libraries to link with in the "Additional 
   127 					Options:" box.&nbsp; Note: This must be done&nbsp;for&nbsp;each&nbsp;build 
   128 					configuration (eg. Release,Debug).</FONT></STRONG></P>
   129 		<H3>
   130 			SDL 101, First Day of Class
   131 		</H3>
   132 		<P>
   133 			Now create the basic body of your project. The body of your program should take 
   134 			the following form: <CODE>
   135 				<PRE>
   136 #include "SDL.h"
   138 int main( int argc, char* argv[] )
   139 {
   140   // Body of the program goes here.
   141   return 0;
   142 }
   143 </PRE>
   144 			</CODE>
   145 		<P></P>
   146 		<H3>
   147 			That's it!
   148 		</H3>
   149 		<P>
   150 			I hope that this document has helped you get through the most difficult part of 
   151 			using the SDL: installing it. Suggestions for improvements to this document 
   152 			should be sent to the writers of this document.
   153 		</P>
   154 		<P>
   155 			Thanks to Paulus Esterhazy (, for the work on VC++ port.
   156 		</P>
   157 		<P>
   158 			This document was originally called "VisualC.txt", and was written by <A HREF="">
   159 				Sam Lantinga</A>.
   160 		</P>
   161 		<P>
   162 			Later, it was converted to HTML and expanded into the document that you see 
   163 			today by <A HREF="">Lion Kimbro</A>.
   164 		</P>
   165 		<P>Minor Fixes and Visual C++ 7 Information (In Green) was added by <A HREF="">James Turk</A>
   166 		</P>
   167 	</BODY>
   168 </HTML>