initial

1 files changed, 24 insertions, 0 deletions

diff --git a/math.lua b/math.lua
new file mode 100644
index 0000000..cd6745e
--- /dev/null
+++ b/math.lua
@@ -0,0 +1,24 @@
+local M = {}
+
+function M.lerp(a,b,t) return (1-t)*a + t*b end
+function M.smoothstep(x)
+	if x<0 then return 0 end
+	if x>1 then return 1 end
+	return x*x*(3 - 2*x)
+end
+function M.slerp(a,b,t) return M.lerp(a,b,M.smoothstep(t)) end
+
+
+function M.sign(x)
+	if x == 0 then return 0
+	elseif x < 0 then return -1
+	elseif x > 0 then return 1
+	end
+end
+
+function M.clamp(x,minv,maxv)
+	return math.min(math.max(x,minv),maxv)
+end
+
+
+return M