main.cpp

#include<ImGui/imgui.h>
#include<ImGui/imgui_impl_glfw.h>
#include<ImGui/imgui_impl_opengl3.h>
#include<ImGui/imfilebrowser.h>

#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <iostream>
#include<stb_image.h>

#include"Material.h"
#include"ImageLoader.h"
#include"TextureLoader.h"

const int Widht = 800;
const int Height = 600;

bool WireFrame = false;
void framebuffer_size_callback(GLFWwindow* window, int width, int height);
void processInput(GLFWwindow* window);

float vertices[] = {
	 0.5f, 0.5f,0.0f,	1.0f,1.0f,1.0f,		1.0f,1.0f,
	 0.5f,-0.5f,0.0f,	1.0f,1.0f,1.0f,		1.0f,0.0f,
	-0.5f,-0.5f,0.0f,	1.0f,1.0f,1.0f,		0.0f,0.0f,
	-0.5f, 0.5f,0.0f,	1.0f,1.0f,1.0f,		0.0f,1.0f
};
unsigned int  indices[] = {
	0,1,3,
	1,2,3
};

int main() {

	glfwInit();
	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
	
	GLFWwindow* window = glfwCreateWindow(Widht, Height, "Light Engine", NULL, NULL);

	if (window == NULL)
	{
		std::cout << "Failed to create GLFW window" << std::endl;
		glfwTerminate();
		return -1;
	}
	glfwMakeContextCurrent(window);

	if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
	{
		std::cout << "Failed to initialize GLAD" << std::endl;
		return -1;
	}
	glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
	
	


	Material material("default.vert","default.frag");

	unsigned int VBO;
	unsigned int VAO;
	unsigned int EBO;
	glGenBuffers(1, &EBO);

	glGenVertexArrays(1, &VAO);
	glBindVertexArray(VAO);
	glGenBuffers(1, &VBO);
	glBindBuffer(GL_ARRAY_BUFFER, VBO);
	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);
	glEnableVertexAttribArray(0);
	glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(3*sizeof(float)));
	glEnableVertexAttribArray(1);
	glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(6 * sizeof(float)));
	glEnableVertexAttribArray(2);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
	glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);

	//texture
	TextureLoader textureimag("texture.tex", "wall");
	unsigned int texture;
	glGenTextures(1, &texture);
	glBindTexture(GL_TEXTURE_2D, texture);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	
	if (textureimag.nrChannels == 1) {
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, textureimag.width, textureimag.height, 0, GL_RED, GL_UNSIGNED_BYTE, textureimag.data);
	}
	if (textureimag.nrChannels == 3) {
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, textureimag.width, textureimag.height, 0, GL_RGB, GL_UNSIGNED_BYTE, textureimag.data);
	}
	if (textureimag.nrChannels > 3) {
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, textureimag.width, textureimag.height, 0, GL_RGBA, GL_UNSIGNED_BYTE, textureimag.data);
	}
	glGenerateMipmap(GL_TEXTURE_2D);
	
	glViewport(0, 0, Widht, Height);
	
	//Editor:
	std::string fileloc = "";
	

	IMGUI_CHECKVERSION();
	ImGui::CreateContext();
	ImGuiIO& io = ImGui::GetIO(); (void)io;
	ImGui::StyleColorsDark();
	ImGui_ImplGlfw_InitForOpenGL(window, true);
	ImGui_ImplOpenGL3_Init("#version 330");

	//File browser:
	ImGui::FileBrowser fileBrowser;
	fileBrowser.SetTitle("Image Loader:");

	while (!glfwWindowShouldClose(window)){
		processInput(window);

		glClearColor(0.53f, 0.80f, 0.92f, 1.0f);
		glClear(GL_COLOR_BUFFER_BIT);
		
		ImGui_ImplOpenGL3_NewFrame();
		ImGui_ImplGlfw_NewFrame();
		ImGui::NewFrame();

		material.use();
		glBindTexture(GL_TEXTURE_2D, texture);
		glBindVertexArray(VAO);
		glDrawElements(GL_TRIANGLES, 6,GL_UNSIGNED_INT,0);
		glBindVertexArray(0);

		if (!WireFrame) {
			glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
		}
		else
		{
			glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
		}
		ImGui::Begin("Editor");
		if (ImGui::Button("Load Image file")) {
			fileBrowser.Open();
		}
		ImGui::Checkbox("WireFrame Mode:", &WireFrame);
		//ImGui::InputText("Save to:",(char*)&fileloc,IM_ARRAYSIZE(fileloc.c_str()));

		ImGui::End();
		fileBrowser.Display();
		if (fileBrowser.HasSelected()) {
			std::cout << "Image:" << fileBrowser.GetSelected().string() << std::endl;
			ImageLoader image(fileBrowser.GetSelected().string(),fileBrowser.GetSelected().filename().string());
			fileBrowser.ClearSelected();
		}
		ImGui::Render();
		ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
		glfwSwapBuffers(window);
		glfwPollEvents();
	}
	ImGui_ImplOpenGL3_Shutdown();
	ImGui_ImplGlfw_Shutdown();
	ImGui::DestroyContext();


	glfwTerminate();
	return 0;
}
void framebuffer_size_callback(GLFWwindow* window, int width, int height)
{
	glViewport(0, 0, width, height);
}
void processInput(GLFWwindow* window) {
	
}