Add camera class

3 years ago · ab9a94358a
2 changed files with 298 additions and 0 deletions
--- a/inferno/src/inferno/render/camera.cpp
+++ b/inferno/src/inferno/render/camera.cpp
@ -0,0 +1,211 @@
+#include <memory> // std::make_shared
+
+#include <glm/ext/matrix_clip_space.hpp> // glm::perspective, glm::ortho
+#include <glm/ext/matrix_transform.hpp>  // glm::radians
+#include <glm/gtx/transform.hpp>         // glm::lookAt, glm::perspective
+
+#include "inferno/application.h"
+#include "inferno/component/transform.h"
+#include "inferno/input.h"
+#include "inferno/inputcodes.h"
+#include "inferno/render/camera.h"
+#include "inferno/window.h"
+
+namespace Inferno {
+
+	Camera::Camera()
+		: Camera({0.0f, 0.0f, 0.0f}, {0.0f, 0.0f, 0.0f})
+	{
+	}
+
+	Camera::Camera(glm::vec3 translate, glm::vec3 rotate)
+	{
+		glm::vec3 scale = {1.0f, 1.0f, 1.0f};
+		m_transform = std::make_shared<Transform>(translate, rotate, scale);
+	}
+
+// ----------------------------------------
+
+	OrthographicCamera::OrthographicCamera()
+		: Camera({0.0f, 0.0f, -1.0f}, {0.0f, 0.0f, 1.0f})
+	{
+		initialize();
+	}
+
+	OrthographicCamera::OrthographicCamera(glm::vec3 translate, glm::vec3 rotate)
+		: Camera(translate, rotate)
+	{
+		initialize();
+	}
+
+	void OrthographicCamera::initialize()
+	{
+		// Set the roatation axis
+		m_rotate = glm::vec3(0.0f, 0.0f, 1.0f);
+
+		dbg(Log::Info) << "OrthographicCamera initialized";
+	}
+
+	void OrthographicCamera::update(float deltaTime)
+	{
+		// Update camera rotation
+
+		float cameraRotateSpeed = ROTATE_SPEED * deltaTime;
+
+		glm::vec3 rotate = transform()->rotate();
+		if (Input::isKeyPressed(KeyCode("GLFW_KEY_Q"))) {
+			rotate.z += cameraRotateSpeed;
+		}
+		if (Input::isKeyPressed(KeyCode("GLFW_KEY_E"))) {
+			rotate.z -= cameraRotateSpeed;
+		}
+
+		if (rotate.z > 180.0f)
+			rotate.z -= 360.0f;
+		else if (rotate.z <= -180.0f)
+			rotate.z += 360.0f;
+
+		transform()->setRotate(rotate);
+
+		// Update camera translation
+
+		float cameraTranslateSpeed = TRANSLATE_SPEED * deltaTime;
+
+		glm::vec3 translate = transform()->translate();
+		// WASD movement
+		if (Input::isKeyPressed(KeyCode("GLFW_KEY_W"))) {
+			translate.x += -sin(glm::radians(rotate.z)) * cameraTranslateSpeed;
+			translate.y +=  cos(glm::radians(rotate.z)) * cameraTranslateSpeed;
+		}
+		if (Input::isKeyPressed(KeyCode("GLFW_KEY_S"))) {
+			translate.x -= -sin(glm::radians(rotate.z)) * cameraTranslateSpeed;
+			translate.y -=  cos(glm::radians(rotate.z)) * cameraTranslateSpeed;
+		}
+		if (Input::isKeyPressed(KeyCode("GLFW_KEY_A"))) {
+			translate.x -= cos(glm::radians(rotate.z)) * cameraTranslateSpeed;
+			translate.y -= sin(glm::radians(rotate.z)) * cameraTranslateSpeed;
+		}
+		if (Input::isKeyPressed(KeyCode("GLFW_KEY_D"))) {
+			translate.x += cos(glm::radians(rotate.z)) * cameraTranslateSpeed;
+			translate.y += sin(glm::radians(rotate.z)) * cameraTranslateSpeed;
+		}
+
+		transform()->setTranslate(translate);
+
+		// Update camera matrix
+
+		// Local space -> World space: model matrix
+		// Is done in Object::update()
+
+		// World space -> View space: view matrix
+		transform()->setTransform(glm::translate(glm::mat4(1.0f), translate) * glm::rotate(glm::mat4(1.0f), glm::radians(rotate.z), m_rotate));
+		transform()->setTransform(glm::inverse(transform()->transform()));
+
+		// View space -> Clip space: projection matrix
+		float aspectRatio = Application::get().getWindow().getAspect();
+		setProjection(glm::ortho(-aspectRatio, aspectRatio, -1.0f, 1.0f, -1.0f, 1.0f));
+
+		// Clip space -> Screen space: viewport transform
+		// Is done in the fragment shader using the settings of glViewport
+	}
+
+// ----------------------------------------
+
+	PerspectiveCamera::PerspectiveCamera()
+		: Camera({0.0f, 0.0f, 1.0f}, {0.0f, 0.0f, -1.0f})
+	{
+		initialize();
+	}
+
+	PerspectiveCamera::PerspectiveCamera(glm::vec3 translate, glm::vec3 rotate)
+		: Camera(translate, rotate)
+	{
+		initialize();
+	}
+
+	void PerspectiveCamera::initialize()
+	{
+		m_fov = 90.0f;
+		m_pitch = 0.0f;
+		m_yaw = -90.0f;
+
+		// Up vector in world space
+		m_up = glm::vec3(0.0f, 1.0f, 0.0f);
+
+		dbg(Log::Info) << "PerspectiveCamera initialized";
+	}
+
+	void PerspectiveCamera::update(float deltaTime)
+	{
+		// Get mouse movement offset compared to last frame
+		float xOffset = Input::getXOffset() * SENSITIVITY;
+		float yOffset = Input::getYOffset() * SENSITIVITY;
+		m_yaw += xOffset;
+		m_pitch += yOffset;
+
+		// Prevent gimbal lock
+		if (m_pitch > 89.0f) m_pitch = 89.0f;
+		if (m_pitch < -89.0f) m_pitch = -89.0f;
+
+		// Update camera rotation, by calculating direction vector via yaw and pitch
+
+		transform()->setRotate(
+			cos(glm::radians(m_pitch)) * cos(glm::radians(m_yaw)),
+			sin(glm::radians(m_pitch)),
+			cos(glm::radians(m_pitch)) * sin(glm::radians(m_yaw)));
+		transform()->setRotate(glm::normalize(transform()->rotate()));
+		// The direction vector is based on
+		// Camera direction (z): normalize(position - target)
+		// Right axis       (x): normalize(cross(up, direction))
+		// Up axis          (y): cross(direction, right)
+
+		// Source: https://learnopengl.com/img/getting-started/camera_axes.png
+
+		// Cross = combination of two vectors in 3D space,
+		//         where result is always perpendicular to both of the vectors
+
+		// Update camera translation
+
+		float cameraSpeed = TRANSLATE_SPEED * deltaTime;
+		// WASD movement
+		if (Input::isKeyPressed(KeyCode("GLFW_KEY_W"))) {
+			transform()->setTranslate(transform()->translate() + cameraSpeed * transform()->rotate());
+		}
+		if (Input::isKeyPressed(KeyCode("GLFW_KEY_S"))) {
+			transform()->setTranslate(transform()->translate() - cameraSpeed * transform()->rotate());
+		}
+		if (Input::isKeyPressed(KeyCode("GLFW_KEY_A"))) {
+			transform()->setTranslate(transform()->translate() -
+						glm::normalize(glm::cross(transform()->rotate(), m_up)) * cameraSpeed);
+		}
+		if (Input::isKeyPressed(KeyCode("GLFW_KEY_D"))) {
+			transform()->setTranslate(transform()->translate() +
+						glm::normalize(glm::cross(transform()->rotate(), m_up)) * cameraSpeed);
+		}
+		// Up / down movement
+		if (Input::isKeyPressed(KeyCode("GLFW_KEY_SPACE"))) {
+			transform()->setTranslate(transform()->translate().x, transform()->translate().y + cameraSpeed, transform()->translate().z);
+		}
+		if (Input::isKeyPressed(KeyCode("GLFW_KEY_LEFT_SHIFT"))) {
+			transform()->setTranslate(transform()->translate().x, transform()->translate().y - cameraSpeed, transform()->translate().z);
+		}
+
+		// Update camera matrix
+
+		// Local space -> World space: model matrix
+		// Is done in Object::update()
+
+		// World space -> View space: view matrix
+		transform()->setTransform(glm::lookAt(transform()->translate(), transform()->translate() + transform()->rotate(), m_up));
+
+		// View space -> Clip space: projection matrix
+		float aspect = Application::get().getWindow().getAspect();
+		setProjection(glm::perspective(glm::radians(m_fov), aspect, NEAR_PLANE, FAR_PLANE));
+
+		// Clip space -> Screen space: viewport transform
+		// Is done in the fragment shader using the settings of glViewport
+
+		// Souce: https://learnopengl.com/img/getting-started/coordinate_systems.png
+	}
+
+}
--- a/inferno/src/inferno/render/camera.h
+++ b/inferno/src/inferno/render/camera.h
@ -0,0 +1,87 @@
+#ifndef CAMERA_H
+#define CAMERA_H
+
+#include "inferno/log.h" // @@@@@@@@@@
+#define TRANSLATE_SPEED 2.5f
+#define ROTATE_SPEED 90.0f
+#define SENSITIVITY 0.25f
+#define NEAR_PLANE 0.1f
+#define FAR_PLANE 100.0f
+
+#include <memory> // std::shared_ptr
+
+#include "glm/ext/matrix_float4x4.hpp" // glm::mat4
+#include "glm/ext/vector_float3.hpp"   // glm:vec3
+
+namespace Inferno {
+
+	class Transform;
+
+	class Camera {
+	public:
+		Camera();
+		Camera(glm::vec3 translate, glm::vec3 rotate);
+		virtual ~Camera() { dbg(Log::Danger) << "KILLED CAMERA"; }
+
+		virtual void initialize() = 0;
+		virtual void update(float deltaTime) = 0;
+		// virtual void render() = 0;
+		// virtual void destroy() = 0;
+
+		void setProjection(glm::mat4 projection) { m_projection = projection; }
+
+		const glm::mat4& projection() const { return m_projection; }
+		const std::shared_ptr<Transform>& transform() const { return m_transform; }
+
+	private:
+		glm::mat4 m_projection;
+		std::shared_ptr<Transform> m_transform;
+	};
+
+// ----------------------------------------
+
+	class OrthographicCamera final : public Camera {
+	public:
+		OrthographicCamera();
+		OrthographicCamera(glm::vec3 translate, glm::vec3 rotate);
+		virtual ~OrthographicCamera() { dbg(Log::Danger) << "KILLED ORTHOGRAPHICCAMERA"; }
+
+		virtual void initialize() override;
+		virtual void update(float deltaTime) override;
+		// virtual void render() override;
+		// virtual void destroy() override;
+
+	private:
+		glm::vec3 m_rotate;
+	};
+
+// ----------------------------------------
+
+	class PerspectiveCamera final : public Camera {
+	public:
+		PerspectiveCamera();
+		PerspectiveCamera(glm::vec3 translate, glm::vec3 rotate);
+		virtual ~PerspectiveCamera() { dbg(Log::Danger) << "KILLED PERSPECTIVECAMERA"; }
+
+		virtual void initialize() override;
+		virtual void update(float deltaTime) override;
+		// virtual void render() override;
+		// virtual void destroy() override;
+
+	private:
+		float m_fov;
+		float m_pitch;
+		float m_yaw;
+		glm::vec3 m_up;
+	};
+
+// ----------------------------------------
+
+}
+
+#endif // CAMERA_H
+
+// @Todo:
+// - Add sensitivity, fov to settings:camera
+// - Add zoom to ortho camera
+// - Change ortho view matrix to use glm::lookAt()