added camera class

src/Engine/Engine.vcxproj

@@ -138,6 +138,7 @@
   </ItemDefinitionGroup>
   <ItemGroup>
     <ClCompile Include="..\..\..\libraries\glad\src\glad.c" />
+    <ClCompile Include="util\camera\camera.cpp" />
     <ClCompile Include="main.cpp" />
     <ClCompile Include="Shaders\Shader.cpp" />
     <ClCompile Include="util\stb_image.cpp" />
@@ -151,6 +152,7 @@
     </CopyFileToFolders>
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="util\camera\camera.h" />
     <ClInclude Include="Exceptions\IOException.h" />
     <ClInclude Include="Exceptions\Shaders\CreateProgramException.h" />
     <ClInclude Include="Exceptions\Shaders\ShaderCompileException.h" />

src/Engine/Engine.vcxproj.filters

@@ -27,6 +27,9 @@
     <ClCompile Include="util\stb_image.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="util\camera\camera.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="Shaders\Shader.h">
@@ -56,6 +59,9 @@
     <ClInclude Include="util\property.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="util\camera\camera.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <CopyFileToFolders Include="Shaders\default\default.frag" />

src/Engine/main.cpp

@@ -10,9 +10,10 @@
 #include "shaders/Shader.h"
 #include "textures/Texture2D.h"
 #include "util/stb_image.h"
+#include "util/camera/camera.h"
 
-// Continue: https://learnopengl.com/Getting-started/Camera
+// Continue: https://learnopengl.com/Lighting/Colors
-// Chapter: Camera class
+// Chapter: Not yet started
 //
 // 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 
@@ -33,12 +34,9 @@ typedef glm::mat4 mat4;
 typedef glm::vec3 vec3;
 
 vec3 cameraPosition = vec3(0.0f, 0.0f, 3.0f);
-vec3 cameraFront = vec3(0.0f, 0.0f, -1.0f);
+Camera cam(cameraPosition);
-vec3 cameraUp = vec3(0.0f, 1.0f, 0.0f);
 
-float deltaTime = 0.0f;
+float deltaTime = 0.0f, lastFrameTime = 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;
@@ -50,24 +48,17 @@ void OnWindowResize(GLFWwindow* window, int width, int height)
 
 void ProcessInput(GLFWwindow* window)
 {
-	const float cameraSpeed = 3.0f * deltaTime;
-
 	if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
 		glfwSetWindowShouldClose(window, true);
+
 	if(glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
-		cameraPosition += cameraSpeed * cameraFront;
+		cam.ProcessKeyboard(MovementDirection::FORWARD, deltaTime);
 	if(glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
-		cameraPosition -= cameraSpeed * cameraFront;
+		cam.ProcessKeyboard(MovementDirection::BACKWARD, deltaTime);
 	if(glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
-		cameraPosition -= glm::normalize(glm::cross(cameraFront, cameraUp)) * cameraSpeed;
+		cam.ProcessKeyboard(MovementDirection::LEFT, deltaTime);
 	if(glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
-		cameraPosition += glm::normalize(glm::cross(cameraFront, cameraUp)) * cameraSpeed;
+		cam.ProcessKeyboard(MovementDirection::RIGHT, deltaTime);
-
-
-	if (glfwGetKey(window, GLFW_KEY_Q) == GLFW_PRESS)
-		cameraFront -= glm::normalize(glm::cross(cameraFront, cameraUp)) * cameraSpeed * 0.25f;
-	if (glfwGetKey(window, GLFW_KEY_E) == GLFW_PRESS)
-		cameraFront += glm::normalize(glm::cross(cameraFront, cameraUp)) * cameraSpeed * 0.25f;
 }
 
 void OnMouseMove(GLFWwindow* window, double xpos, double ypos)
@@ -85,32 +76,12 @@ void OnMouseMove(GLFWwindow* window, double xpos, double ypos)
 	mouseLastX = xpos;
 	mouseLastY = ypos;
 
-	const float sensitivity = 0.1f;
+	cam.ProcessMouseMovement(xoffset, yoffset, true);
-	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;
+	cam.ProcessMouseScroll(yoffset);
-	if (fov < 1.0f)
-		fov = 1.0f;
-	if (fov > 90.0f)
-		fov = 90.0f;
 }
 
 void Configure(GLFWwindow *window)
@@ -152,6 +123,7 @@ int main()
 
 	Configure(window);
 
+
 	float vertices[] = { // object coordinates, uv-coordinates
 	-0.5f, -0.5f, -0.5f,  0.0f, 0.0f,
 	 0.5f, -0.5f, -0.5f,  1.0f, 0.0f,
@@ -268,8 +240,8 @@ int main()
 
 		ProcessInput(window);
 
-		mat4 viewMatrix = glm::lookAt(cameraPosition, cameraPosition + cameraFront, cameraUp);
+		mat4 viewMatrix = cam.GetViewMatrix();
-		mat4 projectionMatrix = glm::perspective(glm::radians(fov), 800.0f / 600.0f, 0.1f, 100.0f);
+		mat4 projectionMatrix = glm::perspective(glm::radians(cam.Fov), 800.0f / 600.0f, 0.1f, 100.0f);
 
 		shader->Use();
 		shader->SetInt("ourTexture1", 0);

src/Engine/util/camera/camera.cpp

@@ -0,0 +1 @@
+#include "camera.h"

src/Engine/util/camera/camera.h

@@ -0,0 +1,111 @@
+#pragma once
+#include <glad/glad.h>
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+
+#include "../property.h"
+
+enum class MovementDirection
+{
+	FORWARD,
+	BACKWARD,
+	LEFT,
+	RIGHT
+};
+
+// Default values
+const float YAW = -90.0f;
+const float PITCH = 0.0f;
+const float SPEED = 2.5f;
+const float SENSITIVITY = 0.1f;
+const float FOV = 45.0f;
+
+class Camera
+{
+public:
+	glm::vec3 Position;
+	glm::vec3 Front;
+	glm::vec3 Up;
+	glm::vec3 Right;
+	glm::vec3 WorldUp;
+
+	float Yaw;
+	float Pitch;
+
+	float MovementSpeed;
+	float MouseSensitivity;
+	float Fov; // or zoom
+
+	Camera(glm::vec3 position = glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3 up = glm::vec3(0.0f, 1.0f, 0.0f), float yaw = YAW, float pitch = PITCH) : Front(glm::vec3(0.0f, 0.0f, -1.0f)), MovementSpeed(SPEED), MouseSensitivity(SENSITIVITY), Fov(FOV)
+	{
+		Position = position;
+		WorldUp = up;
+		Yaw = yaw;
+		Pitch = pitch;
+		UpdateCameraVectors();
+	}
+
+	glm::mat4 GetViewMatrix() { return glm::lookAt(Position, Position + Front, Up); }
+
+	// processes input received from any keyboard-like input system. Accepts input parameter in the form of camera defined ENUM (to abstract it from windowing systems)
+	void ProcessKeyboard(MovementDirection direction, float deltaTime)
+	{
+		float velocity = MovementSpeed * deltaTime;
+		if (direction == MovementDirection::FORWARD)
+			Position += Front * velocity;
+		if (direction == MovementDirection::BACKWARD)
+			Position -= Front * velocity;
+		if (direction == MovementDirection::LEFT)
+			Position -= Right * velocity;
+		if (direction == MovementDirection::RIGHT)
+			Position += Right * velocity;
+	}
+
+	// processes input received from a mouse input system. Expects the offset value in both the x and y direction.
+	void ProcessMouseMovement(float xoffset, float yoffset, GLboolean constrainPitch = true)
+	{
+		xoffset *= MouseSensitivity;
+		yoffset *= MouseSensitivity;
+
+		Yaw += xoffset;
+		Pitch += yoffset;
+
+		// make sure that when pitch is out of bounds, screen doesn't get flipped
+		if (constrainPitch)
+		{
+			if (Pitch > 89.0f)
+				Pitch = 89.0f;
+			if (Pitch < -89.0f)
+				Pitch = -89.0f;
+		}
+
+		// update Front, Right and Up Vectors using the updated Euler angles
+		UpdateCameraVectors();
+	}
+
+	// processes input received from a mouse scroll-wheel event. Only requires input on the vertical wheel-axis
+	void ProcessMouseScroll(float yoffset)
+	{
+		Fov -= (float)yoffset;
+		if (Fov < 1.0f)
+			Fov = 1.0f;
+		if (Fov > 90.0f)
+			Fov = 90.0f;
+	}
+
+private:
+	// calculates the front vector from the Camera's (updated) Euler Angles
+	void UpdateCameraVectors()
+	{
+		glm::vec3 front;
+		front.x = cos(glm::radians(Yaw)) * cos(glm::radians(Pitch));
+		front.y = sin(glm::radians(Pitch));
+		front.z = sin(glm::radians(Yaw)) * cos(glm::radians(Pitch));
+		Front = glm::normalize(front);
+
+		// also re-calculate the Right and Up vector
+		Right = glm::normalize(glm::cross(Front, WorldUp)); // normalize the vectors, because their length gets closer to 0 the more you look up or down which results in slower movement.
+		Up = glm::normalize(glm::cross(Right, Front));
+	}
+};
+

src/Engine/util/property.h

@@ -8,7 +8,24 @@ public:
 
 	T operator()() { return data; }
 	void operator()(const T& d) { data = d; }
+	Property<T> operator=(const T& d) { data = d; }
+	operator T() const { return data; } // to easily pass a property to a function which takes a var of type T for example: void func(float f) => func(property)
+
 private:
 	T data;
 	void operator=(const Property<T>& p); // so this property can not be overwritten, since this might lead to a memory leak. Maybe this operator can be used to assign only the data (C#-like)?
 };
+
+template<typename T>
+class ReadOnlyProperty
+{
+public:
+	ReadOnlyProperty(const T &data): data{data}{}
+
+	T operator()() { return data; }
+	operator T() const { return data; } // to easily pass a property to a function which takes a var of type T for example: void func(float f) => func(property)
+
+private:
+	T data;
+	void operator=(const ReadOnlyProperty<T>& p); // so this property can not be overwritten, since this might lead to a memory leak. Maybe this operator can be used to assign only the data (C#-like)?
+};