From 8b6136e6f50e9b423a703d9adaf3c1c206ce7da5 Mon Sep 17 00:00:00 2001
From: Bill Currie <bill@taniwha.org>
Date: Sun, 25 Apr 2021 15:02:30 +0900
Subject: [PATCH] [mathlib] Add Blend macro

The Blend macro supports any non-integral type supporting * and +
(float, double, vec4f_t, etc), so it is essentially a scalar VectorBlend
or QuatBlend.
---
 include/QF/mathlib.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/QF/mathlib.h b/include/QF/mathlib.h
index 851b841eb..ecb2f87f2 100644
--- a/include/QF/mathlib.h
+++ b/include/QF/mathlib.h
@@ -57,6 +57,8 @@ extern int		nanmask;
 
 #define IS_NAN(x) (((*(int *) (char *) &x) & nanmask) == nanmask)
 
+#define Blend(a,b,blend) ((1 - (blend)) * (a) + (blend) * (b))
+
 #include "QF/math/vector.h"
 #include "QF/math/quaternion.h"
 #include "QF/math/dual.h"