From 2454b5449bbda815eb15327476e376d0d3a39617 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Wed, 5 Mar 2025 22:16:56 +0000
Subject: Move camera out of gl folder, it's not OpenGL specific

---
 gfx/camera.h | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 gfx/camera.h

(limited to 'gfx/camera.h')

diff --git a/gfx/camera.h b/gfx/camera.h
new file mode 100644
index 0000000..d4fe6de
--- /dev/null
+++ b/gfx/camera.h
@@ -0,0 +1,94 @@
+#pragma once
+
+#include "config/types.h"
+#include <glm/glm.hpp>
+#include <maths.h>
+#include <ray.h>
+
+class Camera {
+public:
+	Camera(GlobalPosition3D, Angle fov, Angle aspect, GlobalDistance zNear, GlobalDistance zFar);
+
+	[[nodiscard]] glm::mat4
+	getViewProjection() const
+	{
+		return viewProjection;
+	}
+
+	[[nodiscard]] Ray<GlobalPosition3D> unProject(const ScreenRelCoord &) const;
+
+	void
+	setPosition(const GlobalPosition3D & p)
+	{
+		position = p;
+		updateView();
+	}
+
+	void
+	setForward(const Direction3D & f)
+	{
+		setForward(f, upFromForward(f));
+	}
+
+	void
+	setForward(const Direction3D & f, const Direction3D & u)
+	{
+		forward = f;
+		up = u;
+		updateView();
+	}
+
+	void
+	setView(const GlobalPosition3D & p, const Direction3D & f)
+	{
+		position = p;
+		setForward(f);
+	}
+
+	void
+	setView(const GlobalPosition3D & p, const Direction3D & f, const Direction3D & u)
+	{
+		position = p;
+		setView(f, u);
+	}
+
+	void
+	lookAt(const GlobalPosition3D & target)
+	{
+		setForward(glm::normalize(RelativePosition3D(target - position)));
+	}
+
+	[[nodiscard]] auto
+	getForward() const
+	{
+		return forward;
+	}
+
+	[[nodiscard]] auto
+	getPosition() const
+	{
+		return position;
+	}
+
+	[[nodiscard]] auto &
+	getFrustumPlanes() const
+	{
+		return frustumPlanes;
+	}
+
+	[[nodiscard]] std::array<GlobalPosition4D, 4> extentsAtDist(GlobalDistance) const;
+
+	[[nodiscard]] static Direction3D upFromForward(const Direction3D & forward);
+
+private:
+	void updateView();
+
+	GlobalPosition3D position;
+	Direction3D forward;
+	Direction3D up;
+
+	GlobalDistance near, far;
+	glm::mat4 view, projection;
+	glm::mat4 viewProjection, inverseViewProjection;
+	std::array<glm::vec4, 6> frustumPlanes;
+};
-- 
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