From 5c42364e4353ed5f8cf0cf43b6cfe29af77656a1 Mon Sep 17 00:00:00 2001
From: Daniel <danwip@hotmail.com>
Date: Fri, 4 Aug 2023 22:33:17 +0200
Subject: [PATCH] added GameObject class for future use (replace current
 renering with this class before continuing with the chapters)

---
 src/Engine/Engine.vcxproj         |   2 +-
 src/Engine/Engine.vcxproj.filters |   6 +-
 src/Engine/main.cpp               |   2 +-
 src/Engine/object/game_object.h   | 110 ++++++++++++++++++++++++++++++
 src/Engine/util/camera/camera.cpp |   1 -
 5 files changed, 115 insertions(+), 6 deletions(-)
 create mode 100644 src/Engine/object/game_object.h
 delete mode 100644 src/Engine/util/camera/camera.cpp

diff --git a/src/Engine/Engine.vcxproj b/src/Engine/Engine.vcxproj
index d6d4c6e..6ef7053 100644
--- a/src/Engine/Engine.vcxproj
+++ b/src/Engine/Engine.vcxproj
@@ -138,7 +138,6 @@
   </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" />
@@ -152,6 +151,7 @@
     </CopyFileToFolders>
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="object\game_object.h" />
     <ClInclude Include="util\camera\camera.h" />
     <ClInclude Include="Exceptions\IOException.h" />
     <ClInclude Include="Exceptions\Shaders\CreateProgramException.h" />
diff --git a/src/Engine/Engine.vcxproj.filters b/src/Engine/Engine.vcxproj.filters
index 4e69393..bb4b653 100644
--- a/src/Engine/Engine.vcxproj.filters
+++ b/src/Engine/Engine.vcxproj.filters
@@ -27,9 +27,6 @@
     <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">
@@ -62,6 +59,9 @@
     <ClInclude Include="util\camera\camera.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="object\game_object.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <CopyFileToFolders Include="Shaders\default\default.frag" />
diff --git a/src/Engine/main.cpp b/src/Engine/main.cpp
index 09ef7c6..e9c3b9a 100644
--- a/src/Engine/main.cpp
+++ b/src/Engine/main.cpp
@@ -13,7 +13,7 @@
 #include "util/camera/camera.h"
 
 // Continue: https://learnopengl.com/Lighting/Colors
-// Chapter: Not yet started
+// Chapter: A lighting scene
 //
 // 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 
diff --git a/src/Engine/object/game_object.h b/src/Engine/object/game_object.h
new file mode 100644
index 0000000..84d62d1
--- /dev/null
+++ b/src/Engine/object/game_object.h
@@ -0,0 +1,110 @@
+#pragma once
+#include <vector>
+#include <exception>
+#include <glm/glm.hpp>
+
+#include "../shaders/Shader.h"
+
+namespace Nebulix
+{
+	struct VertexAttribute
+	{
+		GLenum AttributeType = GL_FLOAT;
+		GLboolean Normalised = GL_FALSE;
+		/// <summary>
+		/// The number of elements for this attribute. 
+		/// For example: 1 float value for each the x,y,z coordinate of the vertex which means this variable should be set to 3
+		/// </summary>
+		int NrOfElements = 3;
+		int Stride;
+
+		VertexAttribute(GLenum attributeType = GL_FLOAT, GLboolean normalised = GL_FALSE, int nrOfElements = 3)
+			: AttributeType{ attributeType }, Normalised{ normalised }, NrOfElements{ nrOfElements }
+		{
+			if (attributeType == GL_INT)
+				Stride = nrOfElements * sizeof(int);
+			else if (attributeType == GL_FLOAT)
+				Stride = nrOfElements * sizeof(float);
+			else if (attributeType == GL_DOUBLE)
+				Stride = nrOfElements * sizeof(double);
+			else if (attributeType == GL_BOOL)
+				Stride = nrOfElements * sizeof(bool);
+			else if (attributeType == GL_BYTE)
+				Stride = nrOfElements * sizeof(char);
+			else
+				throw std::exception("ERROR::CONSTRUCT::VERTEX_ATTRIBUTE::NOT_IMPLEMENTED");
+		}
+	};
+
+	// TODO: move the triangle stuff to a seperate mesh class and use the mesh class here 
+	// (in the final engine, this mesh class will be a component and a game object will just hold a list of different components)
+	class GameObject
+	{
+	public:
+		glm::vec3 Position;
+
+		GameObject(std::vector<float>& vertices, std::vector<VertexAttribute> vertexAttributes, Shader shader)
+			: vertices{ vertices }, vertexAttributes{ vertexAttributes }, shader{shader}, Position{glm::vec3(0.0f)}
+		{
+			Init();
+		}
+		GameObject(std::vector<float> &vertices, std::vector<VertexAttribute> vertexAttributes, Shader shader, glm::vec3& position)
+			: vertices{vertices}, vertexAttributes{ vertexAttributes }, shader{ shader }, Position{position}
+		{
+			Init();
+		}
+
+		// NOTE: This method will only call "Shader.Use()" but will not set any properties.
+		// This is because I do not know the names and values of the properties. Most likely this will be possible after learning about materials
+		void Draw()
+		{
+			glBindVertexArray(vertexArray);
+
+			// TODO: Set shader matrices. Wait for materials
+			shader.Use();
+
+			//glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0); // for EBOs
+			glDrawArrays(GL_TRIANGLES, 0, vertices.size()); // for VAOs
+
+		}
+
+		glm::mat4 GetModelMatrix()
+		{
+			glm::mat4 model = glm::mat4(1.0f);
+			// TODO: add properties for rotation/scale and add these to the model matrix
+			return glm::translate(model, Position);
+		}
+
+	private:
+		std::vector<float> vertices;
+		Shader shader;
+
+		GLuint vertexBuffer, vertexArray;
+		std::vector<VertexAttribute> vertexAttributes;
+
+		void Init()
+		{
+			glGenVertexArrays(1, &vertexArray);
+			glGenBuffers(1, &vertexBuffer);
+			glBindVertexArray(vertexArray);
+
+			glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);
+			glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices.data(), GL_STATIC_DRAW);
+
+			int stride = 0;
+			for (size_t i = 0; i < vertexAttributes.size(); i++)
+			{
+				stride += vertexAttributes[i].Stride;
+			}
+
+			int offset = 0;
+			for (size_t i = 0; i < vertexAttributes.size(); i++)
+			{
+				VertexAttribute attr = vertexAttributes[i];
+				glVertexAttribPointer(i, attr.NrOfElements, attr.AttributeType, attr.Normalised, stride, (void*)offset);
+				glEnableVertexAttribArray(i);
+				offset += attr.Stride;
+			}
+		}
+	};
+}
diff --git a/src/Engine/util/camera/camera.cpp b/src/Engine/util/camera/camera.cpp
deleted file mode 100644
index 729cfb7..0000000
--- a/src/Engine/util/camera/camera.cpp
+++ /dev/null
@@ -1 +0,0 @@
-#include "camera.h"