Add fast-forward gaps for checking item spawns

This complicates things greatly! Therefore, it's a separate commit to
the baseline fast-forward functionality, to keep the confusing stuff
relatively contained.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/fastfwd.c b/src/fastfwd.c
index b3098d4..b5b7e6a 100644
--- a/src/fastfwd.c
+++ b/src/fastfwd.c
@@ -66,6 +66,11 @@ void fastfwd(float seconds, float timescale) {
 	skiprate = timescale;
 }
 
+void fastfwd_add(float seconds, float timescale) {
+	skiptime += seconds;
+	skiprate = timescale;
+}
+
 static inline void *find_eng(void *runframe) {
 #ifdef _WIN32
 	const uchar *insns = (const uchar *)runframe;