Handle buddy tris

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