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<h1>The International Obfuscated C Code Contest</h1>
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<h2>2012/blakely - Most GIFted expressions</h2>
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<h3>Animated GIFs of surfaces</h3>
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<a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F2012%2Fblakely%2Findex.html">✓</a>
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<h2 id="author">Author:</h2>
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<ul>
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<li>Name: <a href="../../authors.html#Philip_Blakely">Philip Blakely</a><br>
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Location: <a href="../../location.html#GB">GB</a> - <em>United Kingdom of Great Britain and Northern Ireland</em> (<em>United Kingdom</em>)</li>
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<h2 id="to-build">To build:</h2>
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<pre><code> make</code></pre>
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||
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
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||
<p>The current status of this entry is:</p>
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||
<blockquote>
|
||
<p><strong>STATUS: INABIAF - please DO NOT fix</strong></p>
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||
</blockquote>
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<p>For more detailed information see <a href="../../bugs.html#2012_blakely">2012/blakely in bugs.html</a>.</p>
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<h2 id="to-use">To use:</h2>
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<pre><code> ./blakely "RPN formula" resolution > output.gif</code></pre>
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<h2 id="try">Try:</h2>
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<pre><code> ./try.sh</code></pre>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<p>Several IOCCC themes (<a href="https://en.wikipedia.org/wiki/Reverse_Polish_notation">RPN
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calculator</a>, animated
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<a href="https://en.wikipedia.org/wiki/GIF">GIF</a> generator, <a href="https://en.wikipedia.org/wiki/Ray_tracing_(graphics)">ray
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tracing</a> graphics) in one package!
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Very impressive!</p>
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<p>The checkerboard pattern in the output can be broken. Could you figure out how?</p>
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<p>Larger GIF files confuse some image viewers.</p>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<h3 id="remarks">Remarks</h3>
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<p>This program renders a generic
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<a href="https://en.wikipedia.org/wiki/Reverse_Polish_notation">RPN</a> expression in
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<a href="https://en.wikipedia.org/wiki/Ray_tracing_(graphics)">ray-traced</a> animated
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<a href="https://en.wikipedia.org/wiki/GIF">GIF</a> form. The expression in spatial
|
||
variables <code>x</code> and <code>y</code> is specified on the command-line with the required
|
||
resolution, and an animated GIF showing a fly-around of the resulting surface is
|
||
output to <code>stdout</code>.</p>
|
||
<h3 id="usage">Usage</h3>
|
||
<p>The program should be run as:</p>
|
||
<pre><code> ./blakely xy* 32 > pic.gif</code></pre>
|
||
<p>where the first parameter is a
|
||
<a href="https://en.wikipedia.org/wiki/Reverse_Polish_notation">RPN</a> expression, and the
|
||
second is the width of the required <a href="https://en.wikipedia.org/wiki/GIF">GIF</a>, up
|
||
to a maximum of 250.</p>
|
||
<p>The expressions are written in <a href="https://en.wikipedia.org/wiki/Reverse_Polish_notation">Reverse Polish
|
||
Notation</a> with the
|
||
following characters recognised:</p>
|
||
<pre><code> +, -, *, / - usual arithmetic operations
|
||
^ - Exponentiation; valid for constant exponent only
|
||
s - sin
|
||
c - cos
|
||
0-9 - single digit integers
|
||
d - duplicate number on stack
|
||
t - transpose top two elements on stack
|
||
x - x coordinate value
|
||
y - y coordinate value</code></pre>
|
||
<p>NB: all arithmetic is done in double precision, so <code>23/</code> is two-thirds, rather
|
||
than 0.</p>
|
||
<p>The surface plotted corresponds to <code>-1 <= x,y <= 1</code> and for best results, the
|
||
generated <code>z</code> value should lie between <code>-1</code> and <code>1</code>.</p>
|
||
<p>If there is a division by zero, square-root of a negative number, or similar
|
||
operation, then the results are undefined.</p>
|
||
<h3 id="examples">Examples</h3>
|
||
<p>For test-runs, use a resolution of 32. For simple expressions, the
|
||
<a href="https://en.wikipedia.org/wiki/GIF">GIF</a> generation should take only
|
||
a few seconds with a modern processor and full optimization. Runtime scales as
|
||
O<sup>(N</sup>3), (see <a href="https://en.wikipedia.org/wiki/Big_O_notation">Big O notation</a> web page)
|
||
with resolution <code>N</code>,
|
||
and more complex expressions take longer to compute. For example, increasing the
|
||
resolution of <code>ripple.gif</code>
|
||
to 250 took ~35 minutes to render on an <a href="https://en.wikipedia.org/wiki/Intel_Core#Core_i7">i7
|
||
processor</a>.</p>
|
||
<pre><code> ./blakely xy* 32 > saddle.gif
|
||
|
||
./blakely xx*yy*1++d5*ct/ 64 > ripple.gif</code></pre>
|
||
<h3 id="algorithm">Algorithm</h3>
|
||
<p>A generic root-finding algorithm to find the point of intersection between a ray
|
||
and the surface is done using a simple forward search from the eye. In order to
|
||
make the rendering realistic, both the value of the expression, and its
|
||
derivative with respect to <code>x</code> and <code>y</code> must be tracked. This is done using an
|
||
obvious stack-based approach.</p>
|
||
<h3 id="obfuscations">Obfuscations</h3>
|
||
<p>Much of the obfuscation is achieved through the use of single-letter variables
|
||
and <code>#define</code>s. The characters output for the <a href="https://en.wikipedia.org/wiki/GIF#File_format">GIF
|
||
format</a> are generated in myriad
|
||
and wonderful ways, making use of
|
||
<a href="https://en.wikipedia.org/wiki/Exclusive_or">XOR</a>, return values from
|
||
<code>putchar()</code>, and odd expressions. The layout is in the form of <code>X Y Z</code>.</p>
|
||
<h3 id="limitations">Limitations</h3>
|
||
<p>ASCII is assumed since many bytes for the
|
||
<a href="https://en.wikipedia.org/wiki/GIF">GIF</a> output are generated from characters
|
||
given in the source code. On compilation a few warnings about parentheses come
|
||
up when using gcc 4.6.3, and one about no return value from <code>main()</code> (who uses
|
||
exit codes anyway?), but clang 3.1 emits no warnings.</p>
|
||
<h3 id="questions">Questions</h3>
|
||
<ul>
|
||
<li>Apart from their appearance when computing the <a href="https://en.wikipedia.org/wiki/Reverse_Polish_notation">RPN
|
||
expression</a>, <a href="https://en.wikipedia.org/wiki/Sine_and_cosine">sin and
|
||
cos</a> are not used.
|
||
How do we then get the correct angles for rotation?</li>
|
||
<li>Exactly how many times will the animation repeat?</li>
|
||
<li>Why is there an upper limit of 250x250 for the resolution?</li>
|
||
<li>What is the point of <code>b[0]</code>?</li>
|
||
<li>Where are the words <code>NETSCAPE</code> and <code>GIF</code> hidden in the source?</li>
|
||
</ul>
|
||
<p>(Note that the author may or may not be able to answer all of the above
|
||
questions.)</p>
|
||
<!--
|
||
|
||
Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
|
||
|
||
You are free to share and adapt this file under the terms of this license:
|
||
|
||
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
|
||
|
||
For more information, see:
|
||
|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
-->
|
||
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|
||
|
||
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|
||
|
||
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|
||
|
||
<div id="inventory">
|
||
<h1 id="inventory-for-2012blakely">Inventory for 2012/blakely</h1>
|
||
</div>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/blakely/blakely.c">blakely.c</a> - entry source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/blakely/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/blakely/blakely.orig.c">blakely.orig.c</a> - original source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/blakely/try.sh">try.sh</a> - script to try entry</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="2012_blakely.tar.bz2">2012_blakely.tar.bz2</a> - download entry tarball</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/blakely/README.md">README.md</a> - markdown source for this web page</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/blakely/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/blakely/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/blakely/.path">.path</a> - directory path from top level directory</li>
|
||
<li><a href="index.html">index.html</a> - this web page</li>
|
||
</ul>
|
||
<hr style="width:10%;text-align:left;margin-left:0">
|
||
<h4>
|
||
Jump to: <a href="#">top</a>
|
||
</h4>
|
||
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||
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|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/after-content.default.html -->
|
||
<!-- START: this line starts content from: inc/footer.inventory.html -->
|
||
|
||
<!--
|
||
|
||
Copyright © 1984-2025 by Landon Curt Noll. All Rights Reserved.
|
||
|
||
You are free to share and adapt this file under the terms of this license:
|
||
|
||
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
|
||
|
||
For more information, see:
|
||
|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
-->
|
||
|
||
<div class="footer">
|
||
|
||
<div id="copyright"><h3>Copyright © 1984-2025 by Landon Curt Noll:
|
||
<a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">Some Rights Reserved</a></h3>
|
||
<p>
|
||
This work is <b>licensed by Landon Curt Noll</b> under
|
||
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1"
|
||
target="_blank"
|
||
rel="license noopener noreferrer"
|
||
style="display:inline-block;">CC BY-SA 4.0</a></b>.
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/cc.png"
|
||
alt="cc inside circle symbol">
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/by.png"
|
||
alt="person inside circle symbol">
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/sa.png"
|
||
alt="arrow looping back on itself inside circle symbol"><br>
|
||
You should <b>carefully review</b> the
|
||
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode.en"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">CC BY-SA 4.0 LEGAL CODE</a></b>
|
||
before using the licensed material.<br>
|
||
You may wish to review the
|
||
<b><a href="../../license.html"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">highlights of some of the key features and terms</a></b>
|
||
of <b>CC BY-SA 4.0</b>.<br>
|
||
</p>
|
||
</div>
|
||
|
||
<div id="coda"><h3>Coda</h3>
|
||
<p>
|
||
<a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F2012%2Fblakely%2Findex.html" rel="nofollow">Nu HTML check this web page</a><br>
|
||
<a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a><br>
|
||
</p>
|
||
</div>
|
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||
</div>
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</body>
|
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</html>
|
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|
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