From a9a2a4c8b5aad22d055c670c72eb41fc22b0d812 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sat, 5 Oct 2024 12:17:55 +0100
Subject: Add LightDirection class

---
 gfx/lightDirection.cpp |  8 ++++++++
 gfx/lightDirection.h   | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)
 create mode 100644 gfx/lightDirection.cpp
 create mode 100644 gfx/lightDirection.h

(limited to 'gfx')

diff --git a/gfx/lightDirection.cpp b/gfx/lightDirection.cpp
new file mode 100644
index 0000000..6d7d1ea
--- /dev/null
+++ b/gfx/lightDirection.cpp
@@ -0,0 +1,8 @@
+#include "lightDirection.h"
+#include "maths.h"
+
+LightDirection::LightDirection(const Direction2D sunPos) :
+	pos {sunPos}, vec {glm::mat3 {rotate_yp(pi + sunPos.x, -sunPos.y)} * north},
+	vert {-glm::clamp(-1.F, 0.F, vec.z - 0.1F)}
+{
+}
diff --git a/gfx/lightDirection.h b/gfx/lightDirection.h
new file mode 100644
index 0000000..f1e1cc4
--- /dev/null
+++ b/gfx/lightDirection.h
@@ -0,0 +1,32 @@
+#pragma once
+
+#include "config/types.h"
+
+class LightDirection {
+public:
+	// NOLINTNEXTLINE(hicpp-explicit-conversions) deliberately a helper
+	LightDirection(Direction2D sunPos);
+
+	[[nodiscard]] Direction2D
+	position() const noexcept
+	{
+		return pos;
+	}
+
+	[[nodiscard]] Direction3D
+	vector() const noexcept
+	{
+		return vec;
+	}
+
+	[[nodiscard]] float
+	vertical() const noexcept
+	{
+		return vert;
+	}
+
+private:
+	Direction2D pos;
+	Direction3D vec;
+	float vert;
+};
-- 
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