From 770f7a569c1617f3e7590f04221c1f69e430024d Mon Sep 17 00:00:00 2001
From: Camden Dixie O'Brien <cdo@wip.sh>
Date: Sat, 18 Oct 2025 17:43:22 +0100
Subject: [PATCH] Fix wrapping

---
 renderer.c | 23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/renderer.c b/renderer.c
index a413217..1cc42a5 100644
--- a/renderer.c
+++ b/renderer.c
@@ -5,7 +5,6 @@
 #include <assert.h>
 #include <fcntl.h>
 #include <math.h>
-#include <stdio.h>
 #include <string.h>
 #include <unistd.h>
 #include <xf86drm.h>
@@ -31,9 +30,7 @@ static void page_flip_handler(int, unsigned, unsigned, unsigned, void *)
 
 static void set_pixel(uint32_t x, uint32_t y)
 {
-	x %= width;
-	y %= height;
-	const uint32_t offset = y * (fbs[back].pitch / 4) + x;
+    const uint32_t offset = y * (fbs[back].pitch / 4) + x;
 	fbs[back].buf[offset] = 0xff'ff'ff;
 }
 
@@ -45,8 +42,22 @@ static void draw_line(vec3_t v1, vec3_t v2)
 	if (step != 0.0) {
 		const float step_x = delta_x / step;
 		const float step_y = delta_y / step;
-		for (unsigned i = 0; i <= step; ++i)
-			set_pixel(roundf(v1.x + i * step_x), roundf(v1.y + i * step_y));
+
+		for (unsigned i = 0; i <= step; ++i) {
+			float x = roundf(v1.x + i * step_x);
+			if (x >= width)
+				x -= width;
+			else if (x < 0)
+				x += width;
+
+			float y = roundf(v1.y + i * step_y);
+			if (y >= height)
+				y -= height;
+			else if (y < 0)
+				y += height;
+
+			set_pixel(x, y);
+		}
 	} else {
 		set_pixel(roundf(v1.x), roundf(v1.y));
 	}