From 0e34b2c52c93fe1507d65e634aab683e500eee1e Mon Sep 17 00:00:00 2001
From: Miloslav Ciz <drummyfish@disroot.org>
Date: Mon, 12 May 2025 20:24:27 +0200
Subject: [PATCH] Handle buddy tris

---
 TODO.txt     |  3 +++
 renderer.h   |  1 -
 small3dlib.h | 22 ++++++++++++++++++++++
 3 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/TODO.txt b/TODO.txt
index 49437bc..0e8bc0b 100644
--- a/TODO.txt
+++ b/TODO.txt
@@ -4,6 +4,7 @@ fuck issue trackers :D
 
 - hitting ramps at higher speed still often bugs, try to fiddle with physics
   again (reshape iterations, tension, ...)
+- make car turned on its back behave nicer
 - press forward map??? :-D only when physics is frozen
 - make some kinda repo for world record runs?
 - Try doing the bouncy car body? Just keep a point and its velocity, change
@@ -34,6 +35,8 @@ fuck issue trackers :D
 
 =========== BUGS =================
 
+- at high resolution (like 1920) buggy triangles sometimes appeard, tried to
+  fix this in S3L now but needs to be tested
 - immediately after starting the map countdown seems to be lower (seems to
   perhaps be caused by nextPhysicsFrameTime, look into it)
 
diff --git a/renderer.h b/renderer.h
index 31e3fa8..b47e8dd 100644
--- a/renderer.h
+++ b/renderer.h
@@ -361,7 +361,6 @@ void _LCR_pixelFunc3D(S3L_PixelInfo *pixel)
 
     if (pixel->modelIndex == 8)
     {
-
       // car model
       LCR_loadImage(LCR_IMAGE_CAR);
 
diff --git a/small3dlib.h b/small3dlib.h
index 4b77365..0d8b89b 100644
--- a/small3dlib.h
+++ b/small3dlib.h
@@ -2,6 +2,9 @@
 #define SMALL3DLIB_H
 
 /*
+  NOTE: This is a Licar specific fork of the library. Changes made can be
+  found e.g. with diff.
+
   Simple realtime 3D software rasterization renderer. It is fast, focused on
   resource-limited computers, located in a single C header file, with no
   dependencies, using only 32bit integer arithmetics.
@@ -2016,6 +2019,25 @@ void S3L_drawTriangle(
   p.triangleSize[1] =
     (rPointSS->y > lPointSS->y ? rPointSS->y : lPointSS->y) - tPointSS->y;
 
+  // Licar modifications below: handle buggy triangles (still imperfect)
+  if (S3L_abs(p.triangleSize[0]) > (5 * S3L_RESOLUTION_X / 2) ||
+    S3L_abs(p.triangleSize[1]) > (5 * S3L_RESOLUTION_Y / 2))
+    return;
+
+  lPointSS->x = S3L_clamp(lPointSS->x,
+    -1 * S3L_RESOLUTION_X,2 * S3L_RESOLUTION_X);
+  rPointSS->x = S3L_clamp(rPointSS->x,
+    -1 * S3L_RESOLUTION_X,2 * S3L_RESOLUTION_X);
+  tPointSS->x = S3L_clamp(tPointSS->x,
+    -1 * S3L_RESOLUTION_X,2 * S3L_RESOLUTION_X);
+
+  lPointSS->y = S3L_clamp(lPointSS->y,
+    -1 * S3L_RESOLUTION_Y,2 * S3L_RESOLUTION_Y);
+  rPointSS->y = S3L_clamp(rPointSS->y,
+    -1 * S3L_RESOLUTION_Y,2 * S3L_RESOLUTION_Y);
+  tPointSS->y = S3L_clamp(tPointSS->y,
+    -1 * S3L_RESOLUTION_Y,2 * S3L_RESOLUTION_Y);
+
   // now draw the triangle line by line:
 
   S3L_ScreenCoord splitY; // Y of the vertically middle point of the triangle