From 6bff7aeb8e613b30323bc973f0506531e148ade3 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan.goodliffe@octal.co.uk>
Date: Tue, 13 Dec 2022 12:07:40 +0000
Subject: Maintain a camera's inverse view projection matrix

---
 gfx/gl/camera.cpp | 1 +
 gfx/gl/camera.h   | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/gfx/gl/camera.cpp b/gfx/gl/camera.cpp
index 72b5240..fadbfd7 100644
--- a/gfx/gl/camera.cpp
+++ b/gfx/gl/camera.cpp
@@ -23,4 +23,5 @@ Camera::updateView()
 	view = glm::lookAt(position, position + forward, up);
 	unView = glm::lookAt(::origin, forward, up);
 	viewProjection = projection * view;
+	inverseViewProjection = glm::inverse(viewProjection);
 }
diff --git a/gfx/gl/camera.h b/gfx/gl/camera.h
index bcc7469..3182969 100644
--- a/gfx/gl/camera.h
+++ b/gfx/gl/camera.h
@@ -61,5 +61,5 @@ private:
 	float fov, aspect, near, far;
 	glm::mat4 projection;
 	glm::mat4 view, unView;
-	glm::mat4 viewProjection;
+	glm::mat4 viewProjection, inverseViewProjection;
 };
-- 
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