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----
-title: The Matrix digital rain
-date: 2024-01-12
-thumbnail: thumb_sm.png
-layout: post
----
-
-"All I see is blonde, brunette, red head." The iconic digital rain from The
-Matrix in C, with zero dependencies—not even ncurses.
-
-<video style="max-width:100%;" controls="" poster="poster.png">
-  <source src="matrix.mp4" type="video/mp4">
-</video>
-
-## Overview
-
-This is my fork of Domsson's beautiful <a
-href="https://github.com/domsson/fakesteak" class="external" target="_blank"
-rel="noopener noreferrer">Fakesteak</a>. While going through his code, I
-wondered what it would take to faithfully recreate the original Matrix from the
-first movie without sacrificing its minimalism.
-
-My implementation supports:
-
- - Unicode characters.
- - 24-bit RGB colors (truecolor).
- - Glitches in the matrix.
- - Ghosting effect of old monochrome CRT displays.
- - Closely resembles the Matrix seen in the background during Neo and Cypher's
-   conversation.
-
-With no dependencies, compilation is trivial:
-
-```
-$ cc -O3 main.c -o matrix
-$ ./matrix
-```
-
-## How does it work?
-
-The program tracks the state of the terminal, such as code points, background
-and foreground colors, and cursor position, using multiple internal data
-buffers. On each frame, it updates these buffers and repaints the screen using
-ANSI escape codes:
-
-```
-static void term_print(const matrix *mat, size_t row, size_t col)
-{
-    size_t idx;
-    idx = mat_idx(mat, row, col);
-    wprintf(L"\x1b[%d;%dH\x1b[38;2;%d;%d;%dm%lc",
-        row, col,
-        mat->rgb[idx].color[R],
-        mat->rgb[idx].color[G],
-        mat->rgb[idx].color[B],
-        mat->code[idx]);
-}
-```
-
-The ghosting effect is achieved by carefully scaling the RGB
-channels before mixing them:
-
-```
-static void mat_shade(matrix *mat, size_t row, size_t col) 
-{
-    unsigned char *color;
-    color = mat->rgb[mat_idx(mat, row, col)].color;
-    color[R] = color[R] - (color[R] - COLOR_BG_RED) / 2;
-    color[G] = color[G] - (color[G] - COLOR_BG_GRN) / 2;
-    color[B] = color[B] - (color[B] - COLOR_BG_BLU) / 2;
-}
-```
-
-The ghosting function emulates the dim after glow by gradually transitioning
-each raindrop's color towards the background color. This approach provides two
-key benefits: straightforward color configuration that integrates naturally
-with (Unix) ricing and high-fidelity recreation of the Matrix aesthetic.
-
-## Customization
-
-While you can alter almost every aspect, including speed, glitch frequency, and
-rain density, the most common customizations are the color scheme and character
-set.
-
-There are three color settings: head, tail, and background. You can configure
-them using `COLOR_*_RED`, `COLOR_*_GRN`, and `COLOR_*_BLU` definitions found in
-main.c. 
-
-The `UNICODE_MIN` and `UNICODE_MAX` values control the Unicode block used. For
-example, setting them to `0x30A1` and `0x30F6` rains Katakana, if a font that
-supports Katakana is present on the system:
-
-<img style="width: 100%;" src="katakana.png" />
-
-Files: [source.tar.gz](source.tar.gz)