From b6af53eeffc6c518248b269ee1839fcc3e9bdf22 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Wed, 28 Dec 2022 23:59:46 +0000
Subject: Add helper to apply perspective division

Returns vec3 by default, but dimensions can be specified
---
 lib/maths.h | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'lib')

diff --git a/lib/maths.h b/lib/maths.h
index 5bb69d3..c651af5 100644
--- a/lib/maths.h
+++ b/lib/maths.h
@@ -80,6 +80,13 @@ ratio(glm::vec<2, T, Q> v)
 	return ratio<R>(v.x, v.y);
 }
 
+template<glm::length_t L = 3, typename T, glm::qualifier Q>
+inline constexpr glm::vec<L, T, Q>
+perspective_divide(glm::vec<4, T, Q> v)
+{
+	return v / v.w;
+}
+
 constexpr inline glm::vec2
 operator!(const glm::vec3 & v)
 {
-- 
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