From c2abacf2e7d188aa0999a38dce259b0d8e76b982 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sun, 11 Dec 2022 14:52:09 +0000
Subject: Cache unView matrix for unprojecting mouse clicks, update only on
 camera movement

---
 gfx/gl/camera.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'gfx/gl/camera.cpp')

diff --git a/gfx/gl/camera.cpp b/gfx/gl/camera.cpp
index 994d8ab..72b5240 100644
--- a/gfx/gl/camera.cpp
+++ b/gfx/gl/camera.cpp
@@ -14,13 +14,13 @@ Ray
 Camera::unProject(const glm::vec2 & mouse) const
 {
 	static constexpr const glm::vec4 screen {0, 0, 1, 1};
-	return {position,
-			glm::normalize(glm::unProject(mouse ^ 1, glm::lookAt(::origin, forward, up), projection, screen))};
+	return {position, glm::normalize(glm::unProject(mouse ^ 1, unView, projection, screen))};
 }
 
 void
 Camera::updateView()
 {
 	view = glm::lookAt(position, position + forward, up);
+	unView = glm::lookAt(::origin, forward, up);
 	viewProjection = projection * view;
 }
-- 
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