Add LightDirection class

2 files changed, 40 insertions, 0 deletions

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;
+};