From 4e10d57f83f719e02005fe41e70fe1a4721a9439 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Wed, 5 Mar 2025 23:52:18 +0000
Subject: Split core view definition out of Camera into Frustum

---
 gfx/frustum.h | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 gfx/frustum.h

(limited to 'gfx/frustum.h')

diff --git a/gfx/frustum.h b/gfx/frustum.h
new file mode 100644
index 0000000..25dcc18
--- /dev/null
+++ b/gfx/frustum.h
@@ -0,0 +1,31 @@
+#pragma once
+
+#include <array>
+#include <glm/mat4x4.hpp>
+
+class Frustum {
+public:
+	Frustum(const glm::mat4 & view, const glm::mat4 & projection);
+
+	[[nodiscard]] auto &
+	getFrustumPlanes() const
+	{
+		return planes;
+	}
+
+	[[nodiscard]] auto &
+	getViewProjection() const
+	{
+		return viewProjection;
+	}
+
+	void updateView(const glm::mat4 & view);
+
+protected:
+	static constexpr size_t FACES = 6;
+	void updateCache();
+
+	glm::mat4 view, projection;
+	glm::mat4 viewProjection, inverseViewProjection;
+	std::array<glm::vec4, FACES> planes;
+};
-- 
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