Improvements to matrix rain post.

1 files changed, 18 insertions, 18 deletions

diff --git a/_log/matrix-digital-rain.md b/_log/matrix-digital-rain.md
index e10593f..1a8d9cb 100644
--- a/_log/matrix-digital-rain.md
+++ b/_log/matrix-digital-rain.md
@@ -1,29 +1,29 @@
 ---
-title: 'Matrix rain: 2025 refactor'
+title: Matrix rain (2022) refactor
 date: 2025-12-21
 layout: post
 project: true
 thumbnail: thumb_sm.png
 ---
 
-2022 version worked but had loose ends. Unicode support was
-incomplete--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.
+2022 version worked but had loose ends. Unicode support was incomplete—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.
 
 <video style="max-width:100%;" controls="" poster="poster.png">
   <source src="matrix.mp4" type="video/mp4">
 </video>
 
-Moved phosphor decay into the 4th byte of the RGB union--should’ve done this 
-in 2022; What was I thinking.
+Moved the phosphor decay factor into the 4th byte of the RGB union—should’ve
+done this in 2022; What was I thinking.
 
-Kept the RGB union. Portability not a concern. All my systems are little-endian
-and the code is cleaner this way.
+Kept the RGB union. Portability is not a concern. All my systems are
+little-endian and the code is cleaner this way.
 
-Fixed Unicode by introducing a charset array. UNICODE(min, max) macro 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:
+Fixed Unicode issues by introducing a charset array and a macro that packs
+Unicode ranges into 64-bit unsigned integers: low four bytes for start, high
+four bytes for end. insert_code() unpacks a random block and picks a character
+from it:
 
 ```
 #define UNICODE(min, max)  (((uint64_t)max << 32) | min)
@@ -47,9 +47,9 @@ static inline void insert_code(matrix *mat,
 ```
 
 Full-width Katakana breaks column alignment. Stick to half-width
-(U+FF61-U+FF9F) range. Compile with -DNOKANA to disable Katakana altogether.
+(U+FF61-U+FF9F) range. Added -DNOKANA flag to disable Katakana altogether.
 
-blend() for screen decay is still good. Left it alone:
+blend() function is still good. Left it alone:
 
 ```
 static inline void blend(matrix *mat,
@@ -64,7 +64,7 @@ static inline void blend(matrix *mat,
 }
 ```
 
-Optimized RNG--xorshift instead of rand():
+Replaced rand() with xorshift:
 
 ```
 static inline uint32_t xor(void)
@@ -78,10 +78,10 @@ static inline uint32_t xor(void)
 }
 ```
 
-NOTE: Non-linear variants (xorshitr+) for more speed.
+Came across faster non-linear variants (xorshiftr+). Xorshift was good enough.
 
-Tossed license and automake cruft. Just `cc -O3 main.c -o matrix` now. Don't
-need the ceremony.
+Tossed the license and the automake cruft. Just `cc -O3 main.c -o matrix` now.
+Don't need the ceremony.
 
 Runs at 2-3% CPU on OpenBSD (T490). No regressions. Fans are quiet.