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<h2 class="center" id="title">MATRIX RAIN: 2025 REFACTOR</h2>
<h6 class="center">21 DECEMBER 2025</h5>
<br>
<div class="twocol justify"><p>The 2022 version worked but had some loose ends. Unicode support was
inflexible–couldn’t mix ASCII with Katakana; Phosphor decay was stored in a
separate array when it should’ve been packed with RGB; Code was harder to read
than it needed to be.</p>
<video style="max-width:100%;" controls="" poster="poster.png">
<source src="matrix.mp4" type="video/mp4" />
</video>
<p>Moved phosphor decay into the 4th byte of the RGB union–should’ve done this
in 2022. What was I thinking.</p>
<p>Keeping the RGB union despite portability concerns. All my systems are
little-endian and the code is cleaner this way.</p>
<p>Fixed Unicode by introducing a charset array. UNICODE(min, max) packs Unicode
ranges into uint64–low four bytes for start, high four bytes for end.
insert_code() unpacks a random block and picks a character from it:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>static uint64_t glyphs[] = {
UNICODE(0x0021, 0x007E), /* ASCII */
UNICODE(0xFF65, 0xFF9F), /* Half-width Katakana */
};
</code></pre></div></div>
<p>Full-width Katakana breaks column alignment. Stick to half-width
(U+FF61-U+FF9F) range. Compile with -DNOKANA to disable Katakana altogether.</p>
<p>blend() simulates phosphor decay by eroding RGB channels toward
background color:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>static inline void blend(matrix *mat, size_t row, size_t col)
{
unsigned char *color = mat->rgb[index(mat, row, col)].color;
color[R] = color[R] - (color[R] - RGB_BG_RED) / DECAY_MPLIER;
color[G] = color[G] - (color[G] - RGB_BG_GRN) / DECAY_MPLIER;
color[B] = color[B] - (color[B] - RGB_BG_BLU) / DECAY_MPLIER;
}
</code></pre></div></div>
<p>That’s still good. Leaving it alone.</p>
<p>Tossed license and automake cruft. Just <code class="language-plaintext highlighter-rouge">cc -O3 main.c -o matrix</code> now. Don’t
need the ceremony.</p>
<p>Runs at 2-3% CPU on OpenBSD (T490). No regressions. Fans are quiet.</p>
<p>Commit:
<a href="https://git.asciimx.com/matrix-digital-rain/commit/?id=03f8d87ba7c2e46bd3f3cc4c772fb3a2ac740c92">03f8d87</a></p>
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<p class="post-author right">by W. D. Sadeep Madurange</p>
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