From e8e2408b9d2e2ee5889faab2d480c085e076143f Mon Sep 17 00:00:00 2001
From: Daniel <danwip@hotmail.com>
Date: Thu, 3 Aug 2023 13:00:10 +0200
Subject: [PATCH] finished camera section (TODO: add camera class)

---
 src/Engine/main.cpp | 66 +++++++++++++++++++++++++++++++++++++++------
 1 file changed, 58 insertions(+), 8 deletions(-)

diff --git a/src/Engine/main.cpp b/src/Engine/main.cpp
index 9c79c36..10be1eb 100644
--- a/src/Engine/main.cpp
+++ b/src/Engine/main.cpp
@@ -12,7 +12,7 @@
 #include "util/stb_image.h"
 
 // Continue: https://learnopengl.com/Getting-started/Camera
-// Chapter: Look around
+// Chapter: Camera class
 //
 // TODO: look at project->properties->VC++ Directories-> change everything to the Environment var
 // For the "real" Nebulix Engine setup everything so it can be compiled/used with VSCode/CLion and not just VS 
@@ -38,6 +38,10 @@ vec3 cameraUp = vec3(0.0f, 1.0f, 0.0f);
 
 float deltaTime = 0.0f;
 float lastFrameTime = 0.0f;
+float pitch = 0.0f, yaw = -90.0f, fov = 45.0f;
+float mouseLastX = WINDOW_WIDTH / 2, mouseLastY = WINDOW_HEIGHT / 2;
+
+bool firstMouseMove = true;
 
 void OnWindowResize(GLFWwindow* window, int width, int height)
 {
@@ -66,10 +70,59 @@ void ProcessInput(GLFWwindow* window)
 		cameraFront += glm::normalize(glm::cross(cameraFront, cameraUp)) * cameraSpeed * 0.25f;
 }
 
-void Configure()
+void OnMouseMove(GLFWwindow* window, double xpos, double ypos)
 {
+	if (firstMouseMove)
+	{
+		firstMouseMove = false;
+		mouseLastX = xpos;
+		mouseLastY = ypos;
+		return;
+	}
+
+	float xoffset = xpos - mouseLastX;
+	float yoffset = mouseLastY - ypos; // reversed since y-coordinates range from bottom to top
+	mouseLastX = xpos;
+	mouseLastY = ypos;
+
+	const float sensitivity = 0.1f;
+	xoffset *= sensitivity;
+	yoffset *= sensitivity;
+
+	yaw += xoffset;
+	pitch += yoffset;
+
+	if (pitch > 89.0f)
+		pitch = 89.0f;
+	if (pitch < -89.0f)
+		pitch = -89.0f;
+
+	glm::vec3 direction;
+	direction.x = cos(glm::radians(yaw)) * cos(glm::radians(pitch));
+	direction.y = sin(glm::radians(pitch));
+	direction.z = sin(glm::radians(yaw)) * cos(glm::radians(pitch));
+	cameraFront = glm::normalize(direction);
+}
+
+void OnScroll(GLFWwindow* window, double xoffset, double yoffset)
+{
+	fov -= (float)yoffset;
+	if (fov < 1.0f)
+		fov = 1.0f;
+	if (fov > 90.0f)
+		fov = 90.0f;
+}
+
+void Configure(GLFWwindow *window)
+{
+	OnWindowResize(window, WINDOW_WIDTH, WINDOW_HEIGHT);
+	glfwSetFramebufferSizeCallback(window, OnWindowResize);
+	glfwSetCursorPosCallback(window, OnMouseMove);
+	glfwSetScrollCallback(window, OnScroll);
+
 	stbi_set_flip_vertically_on_load(true); // because an image has 0 at top of y axis and opengl expects it to be on the botton, so if this is omitted, the image will be flipped
 	glEnable(GL_DEPTH_TEST);
+	glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
 }
 
 int main()
@@ -95,12 +148,9 @@ int main()
 	{
 		std::cerr << "ERROR::GLAD::INITILISE";
 		return -1;
-	}
+	}	
 
-	OnWindowResize(window, WINDOW_WIDTH, WINDOW_HEIGHT);
-	glfwSetFramebufferSizeCallback(window, OnWindowResize);
-
-	Configure();
+	Configure(window);
 
 	float vertices[] = { // object coordinates, uv-coordinates
 	-0.5f, -0.5f, -0.5f,  0.0f, 0.0f,
@@ -205,7 +255,6 @@ int main()
 	Texture2D containerImage("images/container.jpg");
 	Texture2D faceImage("images/awesomeface.png", 0, GL_RGBA);
 
-	mat4 projectionMatrix = glm::perspective(glm::radians(45.0f), 800.0f / 600.0f, 0.1f, 100.0f);
 
 	// main loop
 	while(!glfwWindowShouldClose(window))
@@ -220,6 +269,7 @@ int main()
 		ProcessInput(window);
 
 		mat4 viewMatrix = glm::lookAt(cameraPosition, cameraPosition + cameraFront, cameraUp);
+		mat4 projectionMatrix = glm::perspective(glm::radians(fov), 800.0f / 600.0f, 0.1f, 100.0f);
 
 		shader->Use();
 		shader->SetInt("ourTexture1", 0);