From bb76f72831af73adb1b2deebd4b9235fa51fa7df Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sun, 11 Dec 2022 14:28:46 +0000
Subject: Cache view and viewProject matrices, update only on camera movement

---
 gfx/gl/camera.cpp | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

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

diff --git a/gfx/gl/camera.cpp b/gfx/gl/camera.cpp
index 1c46200..994d8ab 100644
--- a/gfx/gl/camera.cpp
+++ b/gfx/gl/camera.cpp
@@ -7,12 +7,7 @@ Camera::Camera(glm::vec3 pos, float fov, float aspect, float zNear, float zFar)
 	position {pos}, forward {::north}, up {::up}, fov {fov}, aspect {aspect}, near {zNear}, far {zFar},
 	projection {glm::perspective(fov, aspect, zNear, zFar)}
 {
-}
-
-glm::mat4
-Camera::getViewProjection() const
-{
-	return projection * glm::lookAt(position, position + forward, up);
+	updateView();
 }
 
 Ray
@@ -22,3 +17,10 @@ Camera::unProject(const glm::vec2 & mouse) const
 	return {position,
 			glm::normalize(glm::unProject(mouse ^ 1, glm::lookAt(::origin, forward, up), projection, screen))};
 }
+
+void
+Camera::updateView()
+{
+	view = glm::lookAt(position, position + forward, up);
+	viewProjection = projection * view;
+}
-- 
cgit v1.2.3