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Landon Curt Noll a1c86c8a7a add original C links to entry navigation bars
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<h1>The International Obfuscated C Code Contest</h1>
<h2>2004/gavare - Best use of light and spheres</h2>
<h3>A ray tracer</h3>
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<div class="navbar">
<a class="Left" href="../burley/index.html">&larr; 2004/burley</a>
<a class="Left" href="../index.html">&uarr; 2004 &uarr;</a>
<a class="Left" href="../gavin/index.html">2004/gavin &rarr;</a>
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2004/gavare/gavare.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Anders_Gavare">Anders Gavare</a><br>
Location: <a href="../../location.html#SE">SE</a> - <em>Kingdom of Sweden</em> (<em>Sweden</em>)</li>
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<h2 id="to-build">To build:</h2>
<pre><code> make</code></pre>
<p>There are three alternate versions; see <a href="#alternate-code">Alternate code</a> below
for more details.</p>
<h2 id="to-use">To use:</h2>
<pre><code> ./gavare &gt; ioccc_ray.ppm</code></pre>
<p>Open <code>ioccc_ray.ppm</code> with a viewer capable of viewing PPM files. Alternatively,
if you have ImageMagick installed, you can convert it to a jpeg:</p>
<pre><code> convert ioccc_ray.ppm ioccc_ray.jpg</code></pre>
<p>and then view <code>ioccc_ray.jpg</code> in a graphics viewer, editor or web browser.</p>
<p><strong>NOTE</strong>: if you do not have ImageMagick installed, see the
FAQ on “<a href="../../faq.html#imagemagick">ImageMagick</a>”
for help.</p>
<h2 id="try">Try:</h2>
<p>If you have <code>xv(1)</code> you can do:</p>
<pre><code> ./gavare | xv -</code></pre>
<p>to not worry about writing it to a file and just viewing the image it creates.</p>
<h2 id="alternate-code">Alternate code:</h2>
<p>The alternate code <a href="https://github.com/ioccc-src/winner/blob/master/2004/gavare/gavare.alt.c">gavare.alt.c</a> allows you to change the size of the
image as well as the anti-alias setting, when compiling.</p>
<p>The author also provided <a href="https://gavare.se/ioccc/ioccc_gavare.c.html">on their web page for the
entry</a> an unobfuscated version that
was used during development, which we have included in the file
<a href="https://github.com/ioccc-src/winner/blob/master/2004/gavare/gavare.r3.c">gavare.r3.c</a> (named such because that is
what they called it).</p>
<p>Finally, the file <a href="https://github.com/ioccc-src/winner/blob/master/2004/gavare/gavare.alt2.c">gavare.alt2.c</a> sets binary mode
on <code>stdout</code> which theoretically should work in Windows (if anything works in
Windows :-) ).</p>
<h3 id="alternate-build">Alternate build:</h3>
<p>To build the configurable and unobfuscated versions:</p>
<pre><code> make alt</code></pre>
<p>To change the default size from 1024x768 try:</p>
<pre><code> make clobber XX=640 YY=480 alt</code></pre>
<p>You might also wish to change the anti-alias setting:</p>
<pre><code> make clobber AA=2 alt</code></pre>
<p>You may of course combine the above two commands and give any combination you
wish.</p>
<p>This is not possible with the author’s version but it is with the alt versions
(Windows - see below).</p>
<p>As the Windows version will not compile on most viewers’ systems we do not build
it with <code>make alt</code>; instead try:</p>
<pre><code> make alt2</code></pre>
<h3 id="alternate-use">Alternate use:</h3>
<p>Use <code>gavare.alt</code>, <code>gavare.r3</code> or <code>gavare.alt2</code> as you would <code>gavare</code> above.</p>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>For users of systems that distinguish between text and binary mode
(you know who you are), add a library call that specifies binary mode
for <code>stdout</code> as the first statement of <code>main()</code>,
or use <code>freopen("ioccc_ray.ppm", "wb", stdout);</code> and do not use redirection (or
see <a href="#alternate-code">Alternate code</a> above).</p>
<p>A freely distributable command-line version of Microsoft Visual C
exhibits an optimizer bug when compiling this entry. Disable <code>/Og</code> for
best results.</p>
<p>The judges were able to figure out how to control position
(in all 3 coordinates), size, and color (to some extent) of the balls.</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<p>It is possible to write some kinds of programs in C without using reserved
words. For very short and trivial programs, it usually isn’t very hard to
write a variant using no reserved words, but with this program I want to
show that also non-trivial programs can be written this way. This IOCCC
entry contains no reserved words (I don’t count <code>main</code> as a reserved word,
although the compiler gives it special meaning) and no preprocessor
directives.</p>
<p>This program is a small
<a href="https://en.wikipedia.org/wiki/Ray_tracing_(graphics)">ray-tracer</a>. The first
line of the source code may be modified if you want the resulting image to be of
some other resolution than the predefined. The <code>A</code> value is an anti-alias
factor. Setting it to <code>1</code> disables the anti-aliasing feature which makes the
output look bad, but setting it too high makes the trace take a lot more time
to complete.</p>
<p>The ppm image can then be viewed using an image viewer of your own choice.
(Running the ray-tracer may take several minutes, even on fast machines,
so be patient.)</p>
<p>I am very much aware about the fact that I’m breaking the guidelines. For
example, the word <code>int</code> is a reserved word and therefore all variable
declarations are implicit. There will no doubt be <em>lots</em> of warnings,
no matter which compiler is used. Still, the source code should be word-
length-independent and endianness-independent.</p>
<h3 id="humor">Humor</h3>
<p>Another reason for writing code without using reserved words is that many
text editors will make all reserved words turn BOLD when printed on
paper. Since I care for the global environment, we shouldn’t waste any
more laser toner, or ink, than necessary. Everyone should write C code
with no reserved words, and our world will be a better place.</p>
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<h1 id="inventory-for-2004gavare">Inventory for 2004/gavare</h1>
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<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2004/gavare/gavare.c">gavare.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2004/gavare/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2004/gavare/gavare.alt2.c">gavare.alt2.c</a> - second alternate source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2004/gavare/gavare.alt.c">gavare.alt.c</a> - alternate source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2004/gavare/gavare.orig.c">gavare.orig.c</a> - original source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2004/gavare/gavare.r3.c">gavare.r3.c</a> - ray tracer used during development</li>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="2004_gavare.tar.bz2">2004_gavare.tar.bz2</a> - download entry tarball</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2004/gavare/README.md">README.md</a> - markdown source for this web page</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2004/gavare/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2004/gavare/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
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