From 85b5fde272be6ab543aa866baebabddc24566bdb Mon Sep 17 00:00:00 2001
From: cheapie <no-email-for-you@example.com>
Date: Sat, 23 May 2026 20:14:34 -0500
Subject: Add initial content

---
 c/gol/gol.c | 89 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 c/gol/gol.c

(limited to 'c/gol/gol.c')

diff --git a/c/gol/gol.c b/c/gol/gol.c
new file mode 100644
index 0000000..1ccb4c4
--- /dev/null
+++ b/c/gol/gol.c
@@ -0,0 +1,89 @@
+/* Conway's Game of Life for RVController
+ * A product of Advanced Mesecons Devices, a Cheapie Systems company
+ * This is free and unencumbered software released into the public domain.
+ * See http://unlicense.org/ for more information */
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "rvcontroller-ecalls.h"
+
+bool field[176] = {false}; // 22*8, extra pixel on each edge will just always be false, makes generation logic easier
+bool field2[176] = {false};
+char screenbuf[121] = {'x'}; //20*6 + terminator
+
+void randomFill(void) {
+	for (int y=1;y<=6;y++) {
+		for (int x=1;x<=20;x++) {
+			int cell = (y*22)+x;
+			field[cell] = (randomint(0,1) == 1);
+		}
+	}
+}
+
+void draw(void) {
+	char channelbuf[3] = {0};
+	for (int y=1;y<=6;y++) {
+		channelbuf[1] = 0x30+y;
+		for (int x=1;x<=20;x++) {
+			channelbuf[0] = 0x40+x;
+			int cell = (y*22)+x;
+			int outpos = ((y-1)*20)+x-1;
+			if (field[cell]) {
+				screenbuf[outpos] = '*';
+				digiline_send(channelbuf,"ffaa55");
+			} else {
+				screenbuf[outpos] = ' ';
+				digiline_send(channelbuf,"552200");
+			}
+		}
+	}
+	screenbuf[120] = 0;
+	printstr(screenbuf);
+}
+
+int countLivingCells(int cell) {
+	int count = 0;
+	if (field[cell-23]) { count += 1; } //Up-left
+	if (field[cell-22]) { count += 1; } //Up
+	if (field[cell-21]) { count += 1; } //Up-right
+	if (field[cell-1])  { count += 1; } //Left
+	if (field[cell+1])  { count += 1; } //Right
+	if (field[cell+21]) { count += 1; } //Down-left
+	if (field[cell+22]) { count += 1; } //Down
+	if (field[cell+23]) { count += 1; } //Down-right
+	return count;
+}
+
+void calculateNewGeneration(void) {
+	for (int y=1;y<=6;y++) {
+		for (int x=1;x<=20;x++) {
+			int cell = (y*22)+x;
+			int living = countLivingCells(cell);
+			if (field[cell]) {
+				//Currently alive, stay if 2 or 3
+				field2[cell] = (living == 2 || living == 3);
+			} else {
+				//Not currently alive, spawn if 3
+				field2[cell] = (living == 3);
+			}
+		}
+	}
+}
+
+void copyNewGeneration(void) {
+	for (int y=1;y<=6;y++) {
+		for (int x=1;x<=20;x++) {
+			int cell = (y*22)+x;
+			field[cell] = field2[cell];
+		}
+	}
+}
+
+void main(void) {
+	randomFill();
+	while (true) {
+		draw();
+		calculateNewGeneration();
+		copyNewGeneration();
+	}
+}
-- 
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