From dd236a39906de5855fdd1252b17a7337f0c7b052 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sun, 28 Feb 2021 23:29:37 +0000
Subject: Vastly improved manual camera controller

---
 application/main.cpp           |  3 ++-
 gfx/manualCameraController.cpp | 30 ++++++++++++++++++------------
 gfx/manualCameraController.h   |  9 +++++++--
 3 files changed, 27 insertions(+), 15 deletions(-)

diff --git a/application/main.cpp b/application/main.cpp
index 2f37c59..8257a79 100644
--- a/application/main.cpp
+++ b/application/main.cpp
@@ -98,7 +98,8 @@ public:
 		const auto framelen = std::chrono::milliseconds {1000} / 120;
 
 		inputStack.objects.push_back(shared_from_this());
-		inputStack.objects.insert(inputStack.objects.begin(), world.create<ManualCameraController>());
+		inputStack.objects.insert(
+				inputStack.objects.begin(), world.create<ManualCameraController>(glm::vec2 {-1150, -1150}));
 
 		while (isRunning) {
 			processInputs();
diff --git a/gfx/manualCameraController.cpp b/gfx/manualCameraController.cpp
index 01787c6..62c48c8 100644
--- a/gfx/manualCameraController.cpp
+++ b/gfx/manualCameraController.cpp
@@ -1,5 +1,8 @@
 #include "manualCameraController.h"
+#include <algorithm>
+#include <cmath>
 #include <gfx/gl/camera.h>
+#include <maths.h>
 
 bool
 ManualCameraController::handleInput(SDL_Event & e)
@@ -39,9 +42,19 @@ ManualCameraController::handleInput(SDL_Event & e)
 			break;
 		case SDL_MOUSEMOTION:
 			if (mrb) {
-				motion = e.motion;
+				if (ctrl) {
+					direction -= 0.01F * e.motion.xrel;
+					pitch = std::clamp(pitch - 0.01F * e.motion.yrel, 0.1F, half_pi);
+				}
+				else {
+					focus.x += cos(direction) * e.motion.xrel + sin(direction) * e.motion.yrel;
+					focus.y += cos(direction) * e.motion.yrel - sin(direction) * e.motion.xrel;
+				}
 			}
 			return true;
+		case SDL_MOUSEWHEEL:
+			dist = std::clamp(dist - e.wheel.y * 4.F, 5.F, 200.F);
+			break;
 	}
 	return false;
 }
@@ -49,15 +62,8 @@ ManualCameraController::handleInput(SDL_Event & e)
 void
 ManualCameraController::updateCamera(Camera * camera) const
 {
-	if (motion) {
-		if (ctrl) {
-			camera->RotateY(-0.01F * motion->xrel);
-			camera->Pitch(-0.01F * motion->yrel);
-		}
-		else {
-			camera->MoveRight(motion->xrel);
-			camera->SlideForward(motion->yrel);
-		}
-		motion.reset();
-	}
+	const auto rel {glm::normalize(glm::vec3 {sin(direction), -sin(pitch), cos(direction)})};
+	camera->pos = !focus + up * 3.F - (rel * std::pow(dist, 1.3F));
+	camera->forward = glm::normalize(rel);
+	camera->up = up;
 }
diff --git a/gfx/manualCameraController.h b/gfx/manualCameraController.h
index 465f31f..f2141a4 100644
--- a/gfx/manualCameraController.h
+++ b/gfx/manualCameraController.h
@@ -5,12 +5,15 @@
 #include "inputHandler.h"
 #include <SDL2/SDL.h>
 #include <gfx/camera_controller.h>
-#include <optional>
+#include <glm/glm.hpp>
+#include <maths.h>
 
 class Camera;
 
 class ManualCameraController : public CameraController, public InputHandler {
 public:
+	explicit ManualCameraController(glm::vec2 f) : focus {f} { }
+
 	bool handleInput(SDL_Event & e) override;
 
 	void tick(TickDuration) override { }
@@ -19,6 +22,8 @@ public:
 
 private:
 	bool ctrl {false}, mrb {false};
-	mutable std::optional<SDL_MouseMotionEvent> motion;
+	glm::vec2 focus;
+	float direction {quarter_pi};
+	float dist {40}, pitch {quarter_pi};
 };
 #endif
-- 
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