persp protects against divide by zero.

1 files changed, 1 insertions, 0 deletions

diff --git a/maths.c b/maths.c
index 5ec40d7..db11491 100644
--- a/maths.c
+++ b/maths.c
@@ -229,6 +229,7 @@ int* vec_cpy(int* d, const int* s, int c) {
 }
 
 void persp(int* v, int asp) {
+	v[2] += !v[2];
 	v[0] = ((v[0] << fbits) / v[2]);
 	v[1] = ((v[1] << fbits) / v[2]) * asp >> fbits;
 	v[2] = f1;