From 4d7b1da29e0957ac798ee8e6da8288cbd4ae5c79 Mon Sep 17 00:00:00 2001
From: LaG1924 <12997935+LaG1924@users.noreply.github.com>
Date: Thu, 18 May 2017 19:03:05 +0500
Subject: 2017-05-18

---
 src/graphics/Camera3D.cpp | 79 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 src/graphics/Camera3D.cpp

(limited to 'src/graphics/Camera3D.cpp')

diff --git a/src/graphics/Camera3D.cpp b/src/graphics/Camera3D.cpp
new file mode 100644
index 0000000..eb740e4
--- /dev/null
+++ b/src/graphics/Camera3D.cpp
@@ -0,0 +1,79 @@
+#include "Camera3D.hpp"
+
+Camera3D::Camera3D(glm::vec3 position, glm::vec3 up, GLfloat yaw, GLfloat pitch) : Front(glm::vec3(0.0f, 0.0f, -1.0f)),
+                                                                               MovementSpeed(SPEED),
+                                                                               MouseSensitivity(SENSITIVTY),
+                                                                               Zoom(ZOOM) {
+    this->Position = position;
+    this->WorldUp = up;
+    this->Yaw = yaw;
+    this->Pitch = pitch;
+    this->updateCameraVectors();
+}
+
+Camera3D::Camera3D(GLfloat posX, GLfloat posY, GLfloat posZ, GLfloat upX, GLfloat upY, GLfloat upZ, GLfloat yaw,
+               GLfloat pitch) : Front(glm::vec3(0.0f, 0.0f, -1.0f)), MovementSpeed(SPEED), MouseSensitivity(SENSITIVTY),
+                                Zoom(ZOOM) {
+    this->Position = glm::vec3(posX, posY, posZ);
+    this->WorldUp = glm::vec3(upX, upY, upZ);
+    this->Yaw = yaw;
+    this->Pitch = pitch;
+    this->updateCameraVectors();
+}
+
+glm::mat4 Camera3D::GetViewMatrix() {
+    return glm::lookAt(this->Position, this->Position + this->Front, this->Up);
+}
+
+void Camera3D::ProcessKeyboard(Camera_Movement direction, GLfloat deltaTime) {
+    GLfloat velocity = this->MovementSpeed * deltaTime;
+    if (direction == FORWARD)
+        this->Position += this->Front * velocity;
+    if (direction == BACKWARD)
+        this->Position -= this->Front * velocity;
+    if (direction == LEFT)
+        this->Position -= this->Right * velocity;
+    if (direction == RIGHT)
+        this->Position += this->Right * velocity;
+}
+
+void Camera3D::ProcessMouseMovement(GLfloat xoffset, GLfloat yoffset, GLboolean constrainPitch) {
+    xoffset *= this->MouseSensitivity;
+    yoffset *= this->MouseSensitivity;
+
+    this->Yaw += xoffset;
+    this->Pitch += yoffset;
+
+    // Make sure that when pitch is out of bounds, screen doesn't get flipped
+    if (constrainPitch) {
+        if (this->Pitch > 89.0f)
+            this->Pitch = 89.0f;
+        if (this->Pitch < -89.0f)
+            this->Pitch = -89.0f;
+    }
+
+    // Update Front, Right and Up Vectors using the updated Eular angles
+    this->updateCameraVectors();
+}
+
+void Camera3D::ProcessMouseScroll(GLfloat yoffset) {
+    if (this->Zoom >= 1.0f && this->Zoom <= 45.0f)
+        this->Zoom -= yoffset/5.0f;
+    if (this->Zoom <= 1.0f)
+        this->Zoom = 1.0f;
+    if (this->Zoom >= 45.0f)
+        this->Zoom = 45.0f;
+}
+
+void Camera3D::updateCameraVectors() {
+    // Calculate the new Front vector
+    glm::vec3 front;
+    front.x = cos(glm::radians(this->Yaw)) * cos(glm::radians(this->Pitch));
+    front.y = sin(glm::radians(this->Pitch));
+    front.z = sin(glm::radians(this->Yaw)) * cos(glm::radians(this->Pitch));
+    this->Front = glm::normalize(front);
+    // Also re-calculate the Right and Up vector
+    this->Right = glm::normalize(glm::cross(this->Front,
+                                            this->WorldUp));  // Normalize the vectors, because their length gets closer to 0 the more you look up or down which results in slower movement.
+    this->Up = glm::normalize(glm::cross(this->Right, this->Front));
+}
-- 
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