From 87701279438dd44d758bb486da15e1e5003c872d Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Tue, 16 Feb 2021 18:19:39 +0000
Subject: Add a camera controller that follows vehicles

---
 gfx/followCameraController.cpp | 42 ++++++++++++++++++++++++++++++++++++++++++
 gfx/followCameraController.h   | 24 ++++++++++++++++++++++++
 2 files changed, 66 insertions(+)
 create mode 100644 gfx/followCameraController.cpp
 create mode 100644 gfx/followCameraController.h

(limited to 'gfx')

diff --git a/gfx/followCameraController.cpp b/gfx/followCameraController.cpp
new file mode 100644
index 0000000..0034c3b
--- /dev/null
+++ b/gfx/followCameraController.cpp
@@ -0,0 +1,42 @@
+#include "followCameraController.h"
+#include "game/vehicles/vehicle.h"
+#include "gfx/gl/transform.h"
+#include <gfx/gl/camera.h>
+#include <gfx/gl/shader.h>
+#include <glm/glm.hpp>
+#include <maths.h>
+#include <memory>
+#include <tuple>
+#include <utility>
+
+FollowCameraController::FollowCameraController(VehicleWPtr t, Mode m) : target(std::move(t)), mode(m) { }
+
+void
+FollowCameraController::updateCamera(Camera * camera, Shader * shader) const
+{
+	const auto [pos, rot] = [this]() {
+		const auto t {target.lock()};
+		return std::tie(t->getLocation().GetPos(), t->getLocation().GetRot());
+	}();
+
+	switch (mode) {
+		case Mode::Pan:
+			camera->forward = glm::normalize(pos - camera->pos);
+			camera->up = up;
+			break;
+
+		case Mode::Ride:
+			camera->pos = pos + (up * 4.8F);
+			camera->forward = {-std::sin(rot.y), 0.F, -std::cos(rot.y)};
+			camera->up = up;
+			break;
+
+		case Mode::ISO:
+			camera->pos = pos + ((up + north + east) * 20.F);
+			camera->forward = -glm::normalize(up + north + east);
+			camera->up = glm::normalize(up - north - east);
+			break;
+	}
+
+	shader->setView(camera->GetViewProjection());
+}
diff --git a/gfx/followCameraController.h b/gfx/followCameraController.h
new file mode 100644
index 0000000..d57b59f
--- /dev/null
+++ b/gfx/followCameraController.h
@@ -0,0 +1,24 @@
+#ifndef FOLLOW_CAMERA_CONTROLLER_H
+#define FOLLOW_CAMERA_CONTROLLER_H
+
+#include "game/worldobject.h"
+#include <game/vehicles/vehicle.h>
+#include <gfx/camera_controller.h>
+
+class Camera;
+class Shader;
+
+class FollowCameraController : public CameraController {
+public:
+	enum class Mode { Pan, Ride, ISO };
+	explicit FollowCameraController(VehicleWPtr, Mode = Mode::Pan);
+
+	void tick(TickDuration) override { }
+
+	void updateCamera(Camera * camera, Shader * shader) const override;
+
+private:
+	VehicleWPtr target;
+	Mode mode;
+};
+#endif
-- 
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