From 20b9f0d4f1914dd2cf144d466ed88fd495578710 Mon Sep 17 00:00:00 2001
From: ionut <ionut.alex.parau@gmail.com>
Date: Fri, 1 May 2026 15:28:12 +0300
Subject: [PATCH] bugfixes and improvements

credit to blendi for fixing the depth mapper
---
 TODO.md          |  1 -
 src/machine.lua  |  2 +-
 src/main.c       |  1 +
 src/neonucleus.c | 24 +++++++++++++++++-------
 4 files changed, 19 insertions(+), 9 deletions(-)

diff --git a/TODO.md b/TODO.md
index b96331d..c5e5102 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,6 +1,5 @@
 # For MVP functionality
 
-- fix coloring issue in UlOS 2 beta 5 (and in OpenOS `dmesg`, it appears color-mapper is wrong)
 - make `computer` component use callbacks
 - make a lot of stuff which likely will need to be indirect actually be indirect (modem comms, computer funcs)
 - make beeps, power, etc. be callbacks on one shared local state (computer environment)
diff --git a/src/machine.lua b/src/machine.lua
index 791828e..381f4ab 100644
--- a/src/machine.lua
+++ b/src/machine.lua
@@ -72,7 +72,7 @@ local syncedMethodStats
 
 local function realInvoke(address, method, ...)
 	local t = {pcall(cinvoke, address, method, ...)}
-	if not _SYNCED then
+	if not _SYNCED and not os.getenv("NN_FAST") then
 		if computer.energy() <= 0 then sysyield() end -- out of power
 		if computer.isOverused() then sysyield() end -- overused
 		if computer.isIdle() then sysyield() end -- machine idle
diff --git a/src/main.c b/src/main.c
index 3b0b8fd..3004b05 100644
--- a/src/main.c
+++ b/src/main.c
@@ -496,6 +496,7 @@ int main(int argc, char **argv) {
 	nn_mountComponent(c, testFlash, 5, false);
 	int ltx = 0, lty = 0;
 	double scrollBuf = 0;
+	SetTargetFPS(60);
 	while(true) {
 		if(WindowShouldClose()) break;
 
diff --git a/src/neonucleus.c b/src/neonucleus.c
index 76d01cd..3420e18 100644
--- a/src/neonucleus.c
+++ b/src/neonucleus.c
@@ -2909,9 +2909,9 @@ void nn_initPalettes() {
 }
 
 static void nn_splitColor(int color, double *r, double *g, double *b) {
-	int _r = (color >> 16) & 0xFF;
-	int _g = (color >> 8) & 0xFF;
-	int _b = (color >> 0) & 0xFF;
+	unsigned int _r = (color >> 16) & 0xFF;
+	unsigned int _g = (color >> 8) & 0xFF;
+	unsigned int _b = (color >> 0) & 0xFF;
 
 	*r = (double)_r / 255;
 	*g = (double)_g / 255;
@@ -2925,10 +2925,20 @@ double nn_colorLuminance(int color) {
 	return r * 0.2126 + g * 0.7152 + b * 0.0722;
 }
 
+// Credit to Blendi for writing this, the old algorithm based off luminance gave bad results
 static double nn_colorDistance(int a, int b) {
-	double n = nn_colorLuminance(a) - nn_colorLuminance(b);
-	if(n < 0) n = -n;
-	return n;
+	// double n = nn_colorLuminance(a) - nn_colorLuminance(b);
+	// if(n < 0) n = -n;
+
+	double ar,ag,ab;
+	double br,bg,bb;
+
+	nn_splitColor(a, &ar, &ag, &ab);
+	nn_splitColor(b, &br, &bg, &bb);
+	
+	double dr = ar-br, dg = ag-bg, db = ab-bb;
+
+	return ((dr < 0) ? -dr : dr) + ((dg < 0) ? -dg : dg) + ((db < 0) ? -db : db);
 }
 
 int nn_mapColor(int color, int *palette, size_t len) {
@@ -2938,7 +2948,7 @@ int nn_mapColor(int color, int *palette, size_t len) {
 	for(size_t i = 0; i < len; i++) {
 		int entry = palette[i];
 		double dist = nn_colorDistance(color, entry);
-		if(dist < bestDist) {
+		if(dist <= bestDist) {
 			bestDist = dist;
 			bestColor = entry;
 		}