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Landon Curt Noll a1c86c8a7a add original C links to entry navigation bars
The navigation bar for a winning entry now has a "_Original C_" link
(between the ✅ and the Inventory on the right hand side) so that one
may easily view the original C code that was submitted for IOCCC judging.

Ran `make www timestamp` to perform the above.
2025-08-10 12:46:23 -07:00

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<h1>The International Obfuscated C Code Contest</h1>
<h2>2004/vik1 - Best X11 game</h2>
<h3>X Windows car racing game</h3>
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<a class="Left" href="../sds/index.html">&larr; 2004/sds</a>
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<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2004/vik1/vik1.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Daniel_Vik">Daniel Vik</a><br>
Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
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<h2 id="to-build">To build:</h2>
<pre><code> make</code></pre>
<p><strong>NOTE</strong>: this entry requires the <code>X11/Xlib.h</code> header file and the X11 library to
compile. For more information see the
FAQ on “<a href="../../faq.html#X11">X11</a>”.</p>
<h2 id="to-use">To use:</h2>
<pre><code> ./vik1 [arg]</code></pre>
<h2 id="try">Try:</h2>
<pre><code> ./vik1
./vik1 a
./vik1 d2
./vik1 ad3</code></pre>
<p>Can you figure out how to cheat?</p>
<p>Also see the author’s remarks below for more details on the different
modes/options.</p>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>Daniel Vik has presented a tour de force feature rich X11-based
racing game that fit within the contest size limits. Take a
glance at the feature list he provided below. Amazing!</p>
<p>The author posted a video of this on YouTube:
<a href="https://www.youtube.com/watch?v=xTseqWCtAUA" class="uri">https://www.youtube.com/watch?v=xTseqWCtAUA</a>.</p>
<p>Happy touring on the road and in the code!</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<h3 id="features">Features</h3>
<p>This program is a complete car race game with a lot of nice features:</p>
<ul>
<li><p>Drive on a road in a 3D landscape with hills and curves.</p></li>
<li><p>Mountains in the horizon.</p></li>
<li><p>A sun in the sky when driving during the day.</p></li>
<li><p>Dark sky and reduced visibility when driving at night.</p></li>
<li><p>Snow when driving in the winter.</p></li>
<li><p>Slippery road when driving in the winter.</p></li>
<li><p>When driving off the road, the car slows down to a halt.</p></li>
<li><p>Three different race tracks that takes about one minute to complete.</p></li>
<li><p>Speedometer.</p></li>
<li><p>Computer driven opponent cars.</p></li>
<li><p>Collision detection when driving into other cars.</p></li>
<li><p>Lap time measurement.</p></li>
<li><p>The best lap time is stored as reference.</p></li>
</ul>
<h3 id="build-and-run">Build and Run</h3>
<p>Compile the source code and link X libraries if necessary.
The program takes three options which have to be typed in a specific
order as described below.</p>
<h4 id="usage">Usage:</h4>
<pre><code> ./vik1 [&#39;a&#39;][&#39;d&#39;][#]</code></pre>
<ul>
<li><code>a</code>
<ul>
<li>Advanced racing in a winter landscape.</li>
</ul></li>
<li><code>d</code>
<ul>
<li>Racing in at night in the dark.</li>
</ul></li>
<li><code>#</code>
<ul>
<li>Race track selection 1-3 are valid numbers.</li>
</ul></li>
</ul>
<h4 id="examples">Examples:</h4>
<ul>
<li><code>./vik1</code>
<ul>
<li>Run track 1 at daytime in the summer.</li>
</ul></li>
<li><code>./vik1 a</code>
<ul>
<li>Run track 1 at daytime in the winter.</li>
</ul></li>
<li><code>./vik1 d</code>
<ul>
<li>Run track 1 at night in the summer.</li>
</ul></li>
<li><code>./vik1 3</code>
<ul>
<li>Run track 3 at daytime in the summer.</li>
</ul></li>
<li><code>./vik1 d3</code>
<ul>
<li>Run track 3 at night in the summer.</li>
</ul></li>
<li><code>./vik1 ad2</code>
<ul>
<li>Run track 2 at night in the winter.</li>
</ul></li>
</ul>
<p>Note that the order in which the argument characters are entered is
important. It is for example not possible to type <code>./vik1 da</code>. (Well it is
possible, but the result will not be as expected.)</p>
<p>The space key accelerates the car. Releasing the space key slowly
reduces the speed. The left and right arrow keys are used to steer the
car.</p>
<h3 id="obfuscation">Obfuscation</h3>
<p>The main obfuscation is the fact that the program is extremely compact.
There are a few things I didn’t want to do, e.g. define <code>#define</code> to a
single letter to save some space, or to remove casts to save some space.</p>
<p>The program uses a lot of variables. In fact, all letters <code>a-z</code> are used
and most letters <code>A-Z</code>.</p>
<p>The constants are chosen very carefully and they have multiple purposes,
e.g. a constant can be both the length of the track and a color.</p>
<p>Most of the code is kept inside five <code>for</code> loops each without a body. Each <code>for</code>
loop does many things. One <code>for</code> loop draws all cars by restarting a
couple of times. Another draws the road, mountains, and the sun.</p>
<p><code>main()</code> is called recursively. The return value and output depends on the
arguments. <code>main()</code> can return the current time, draw lines and of course be
the entry point of the application.</p>
<p>The program frequently uses the <code>?:</code> operator mainly to save space but it
makes the program more obscure.</p>
<h3 id="compiler-warnings">Compiler warnings</h3>
<p>There are no compiler warnings when compiling with <code>-ansi</code> but there are
many warnings from lclint, mainly because the program is very
optimized for code size.</p>
<h3 id="limitations">Limitations</h3>
<p>The program only compiles and runs on X based systems.</p>
<p>The program requires a display with 24 bit color depth. It also assumes
that the byte order of the colors are as on my Linux PC. That is, The
colors are represented by a 32 bit value where the bytes (from high to
low) are <code>{ 0, RED, GREEN, BLUE }</code>.</p>
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