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/gl/camera.cpp | 67 -------------------------------------------------------
 1 file changed, 67 deletions(-)
 delete mode 100644 gfx/gl/camera.cpp

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

diff --git a/gfx/gl/camera.cpp b/gfx/gl/camera.cpp
deleted file mode 100644
index 9e165fa..0000000
--- a/gfx/gl/camera.cpp
+++ /dev/null
@@ -1,67 +0,0 @@
-#include "camera.h"
-#include <collections.h>
-#include <glm/gtx/transform.hpp>
-#include <maths.h>
-#include <ray.h>
-
-Camera::Camera(GlobalPosition3D pos, Angle fov, Angle aspect, GlobalDistance zNear, GlobalDistance zFar) :
-	position {pos}, forward {::north}, up {::up}, near {zNear}, far {zFar}, view {},
-	projection {
-			glm::perspective(fov, aspect, static_cast<RelativeDistance>(zNear), static_cast<RelativeDistance>(zFar))},
-	viewProjection {}, inverseViewProjection {}
-{
-	updateView();
-}
-
-Ray<GlobalPosition3D>
-Camera::unProject(const ScreenRelCoord & mouse) const
-{
-	static constexpr const glm::vec4 SCREEN {0, 0, 1, 1};
-	return {
-			.start = position,
-			.direction = glm::normalize(glm::unProject(mouse || 1.F, view, projection, SCREEN)),
-	};
-}
-
-void
-Camera::updateView()
-{
-	view = glm::lookAt({}, forward, up);
-	viewProjection = projection * view;
-	inverseViewProjection = glm::inverse(viewProjection);
-	static constexpr auto PLANES = std::array {0, 1, 2} * std::array {1.F, -1.F};
-	std::ranges::transform(PLANES, frustumPlanes.begin(), [vpt = glm::transpose(viewProjection)](const auto & idxs) {
-		const auto [idx, sgn] = idxs;
-		return vpt[3] + (vpt[idx] * sgn);
-	});
-}
-
-Direction3D
-Camera::upFromForward(const Direction3D & forward)
-{
-	const auto right = crossProduct(forward, ::down);
-	return crossProduct(forward, right);
-}
-
-std::array<GlobalPosition4D, 4>
-Camera::extentsAtDist(const GlobalDistance dist) const
-{
-	const auto clampToSeaFloor = [this, dist](GlobalPosition3D target) -> GlobalPosition4D {
-		target += position;
-		if (target.z < -1500) {
-			const CalcPosition3D diff = target - position;
-			const CalcDistance limit = -1500 - position.z;
-			return {position + ((limit * diff) / diff.z), (limit * dist) / diff.z};
-		}
-		return {target, dist};
-	};
-	const auto depth = -(2.F * (static_cast<float>(dist - near)) * static_cast<float>(far))
-					/ (static_cast<float>(dist) * (static_cast<float>(near - far)))
-			- 1.F;
-	static constexpr const std::array extents {-1.F, 1.F};
-	static constexpr const auto cartesianExtents = extents * extents;
-	return cartesianExtents * [&depth, this, &clampToSeaFloor](const auto & extent) {
-		const glm::vec4 in {extent.first, extent.second, depth, 1.F};
-		return clampToSeaFloor(perspective_divide(inverseViewProjection * in));
-	};
-}
-- 
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