main.cpp

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

#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>

#include <iostream>
#include "Utils/ShaderLoader.h"
#include "Utils/TextureLoader.h"
#include "Utils/Camera.h"


void framebuffer_size_callback(GLFWwindow* window, int width, int height);
void mouse_callback(GLFWwindow* window, double xpos, double ypos);
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
void processInput(GLFWwindow *window);

const unsigned int SCR_WIDTH  = 800;
const unsigned int SCR_HEIGHT = 600;

Camera camera(glm::vec3(0.0f, 0.0f, 3.0f));
float lastX = SCR_WIDTH / 2.0f;
float lastY = SCR_HEIGHT / 2.0f;
bool firstMouse = true;

float deltaTime = 0.0f;
float lastFrame = 0.0f;

int main()
{
	glfwInit();
	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

#ifdef __APPLE__
	glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
#endif

	GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
	if (window == NULL)
	{
		std::cout << "Failed to create GLFW window" << std::endl;
		glfwTerminate();
		return -1;
	}
	glfwMakeContextCurrent(window);
	glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
	glfwSetCursorPosCallback(window, mouse_callback);
	glfwSetScrollCallback(window, scroll_callback);

	glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);

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

	glEnable(GL_DEPTH_TEST);

	int lightningShader = loadShaders("Colors", "Colors");
	int lampShader = loadShaders("Lamp", "Lamp");
	float vertices[] = {
		// positions          // normals           // texture coords
		-0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,  0.0f,  0.0f,
		 0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,  1.0f,  0.0f,
		 0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,  1.0f,  1.0f,
		 0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,  1.0f,  1.0f,
		-0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,  0.0f,  1.0f,
		-0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,  0.0f,  0.0f,

		-0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f,  0.0f,  0.0f,
		 0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f,  1.0f,  0.0f,
		 0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f,  1.0f,  1.0f,
		 0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f,  1.0f,  1.0f,
		-0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f,  0.0f,  1.0f,
		-0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f,  0.0f,  0.0f,

		-0.5f,  0.5f,  0.5f, -1.0f,  0.0f,  0.0f,  1.0f,  0.0f,
		-0.5f,  0.5f, -0.5f, -1.0f,  0.0f,  0.0f,  1.0f,  1.0f,
		-0.5f, -0.5f, -0.5f, -1.0f,  0.0f,  0.0f,  0.0f,  1.0f,
		-0.5f, -0.5f, -0.5f, -1.0f,  0.0f,  0.0f,  0.0f,  1.0f,
		-0.5f, -0.5f,  0.5f, -1.0f,  0.0f,  0.0f,  0.0f,  0.0f,
		-0.5f,  0.5f,  0.5f, -1.0f,  0.0f,  0.0f,  1.0f,  0.0f,

		 0.5f,  0.5f,  0.5f,  1.0f,  0.0f,  0.0f,  1.0f,  0.0f,
		 0.5f,  0.5f, -0.5f,  1.0f,  0.0f,  0.0f,  1.0f,  1.0f,
		 0.5f, -0.5f, -0.5f,  1.0f,  0.0f,  0.0f,  0.0f,  1.0f,
		 0.5f, -0.5f, -0.5f,  1.0f,  0.0f,  0.0f,  0.0f,  1.0f,
		 0.5f, -0.5f,  0.5f,  1.0f,  0.0f,  0.0f,  0.0f,  0.0f,
		 0.5f,  0.5f,  0.5f,  1.0f,  0.0f,  0.0f,  1.0f,  0.0f,

		-0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,  0.0f,  1.0f,
		 0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,  1.0f,  1.0f,
		 0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,  1.0f,  0.0f,
		 0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,  1.0f,  0.0f,
		-0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,  0.0f,  0.0f,
		-0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,  0.0f,  1.0f,

		-0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f,  0.0f,  1.0f,
		 0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f,  1.0f,  1.0f,
		 0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,  1.0f,  0.0f,
		 0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,  1.0f,  0.0f,
		-0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,  0.0f,  0.0f,
		-0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f,  0.0f,  1.0f
	};
	// positions all containers
	glm::vec3 cubePositions[] = {
		glm::vec3(0.0f,  0.0f,  0.0f),
		glm::vec3(2.0f,  5.0f, -15.0f),
		glm::vec3(-1.5f, -2.2f, -2.5f),
		glm::vec3(-3.8f, -2.0f, -12.3f),
		glm::vec3(2.4f, -0.4f, -3.5f),
		glm::vec3(-1.7f,  3.0f, -7.5f),
		glm::vec3(1.3f, -2.0f, -2.5f),
		glm::vec3(1.5f,  2.0f, -2.5f),
		glm::vec3(1.5f,  0.2f, -1.5f),
		glm::vec3(-1.3f,  1.0f, -1.5f)
	};

	unsigned int VBO, cubeVAO;
	glGenVertexArrays(1, &cubeVAO);
	glGenBuffers(1, &VBO);

	glBindBuffer(GL_ARRAY_BUFFER, VBO);
	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);

	glBindVertexArray(cubeVAO);

	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);

	unsigned int lightVAO;
	glGenVertexArrays(1, &lightVAO);
	glBindVertexArray(lightVAO);
	glBindBuffer(GL_ARRAY_BUFFER, VBO);

	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);
	glEnableVertexAttribArray(0);

	auto diffuseMap = loadTexture("container2.png");
	auto specularMap = loadTexture("container2_specular.png");

	glUseProgram(lightningShader);
	glUniform1i(glGetUniformLocation(lightningShader, "material.diffuse"), 0);
	glUniform1i(glGetUniformLocation(lightningShader, "material.specular"), 1);

	while (!glfwWindowShouldClose(window))
	{
		float currentFrame = glfwGetTime();
		deltaTime = currentFrame - lastFrame;
		lastFrame = currentFrame;

		processInput(window);

		glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);


		glUseProgram(lightningShader);
		glUniform3fv(glGetUniformLocation(lightningShader, "light.position"), 1, &camera.Position[0]);
		glUniform3fv(glGetUniformLocation(lightningShader, "light.direction"), 1, &camera.Front[0]);
		glUniform1f(glGetUniformLocation(lightningShader, "light.cutOff"), glm::radians(17.5f));
		glUniform1f(glGetUniformLocation(lightningShader, "light.outerCutOff"), glm::radians(12.5f));
		glUniform3fv(glGetUniformLocation(lightningShader, "viewPos"), 1, &camera.Position[0]);

		glUniform3f(glGetUniformLocation(lightningShader, "light.amdient"), 0.1f, 0.1f, 0.1f);
		glUniform3f(glGetUniformLocation(lightningShader, "light.diffuse"), 0.8f, 0.8f, 0.8f);
		glUniform3f(glGetUniformLocation(lightningShader, "light.specular"), 1.0f, 1.0f, 1.0f);

		glUniform1f(glGetUniformLocation(lightningShader, "light.constant"), 1.0f);
		glUniform1f(glGetUniformLocation(lightningShader, "light.linear"), 0.09f);
		glUniform1f(glGetUniformLocation(lightningShader, "light.quadratic"), 0.032f);

		glUniform1f(glGetUniformLocation(lightningShader, "light.shininess"), 32.0f);

		glm::mat4 projection = glm::perspective(glm::radians(camera.Zoom), (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
		glm::mat4 view = camera.GetViewMatrix();

		glUniformMatrix4fv(glGetUniformLocation(lightningShader, "projection"), 1, GL_FALSE, &projection[0][0]);
		glUniformMatrix4fv(glGetUniformLocation(lightningShader, "view"), 1, GL_FALSE, &view[0][0]);

		glm::mat4 model = glm::mat4(1.0f);
		glUniformMatrix4fv(glGetUniformLocation(lightningShader, "model"), 1, GL_FALSE, &model[0][0]);

		glActiveTexture(GL_TEXTURE0);
		glBindTexture(GL_TEXTURE_2D, diffuseMap);

		glActiveTexture(GL_TEXTURE1);
		glBindTexture(GL_TEXTURE_2D, specularMap);

		glBindVertexArray(cubeVAO);
		for (unsigned int i = 0; i < 10; i++)
		{
			glm::mat4 model = glm::mat4(1.0f);
			model = glm::translate(model, cubePositions[i]);
			float angle = 20.0f * i;
			model = glm::rotate(model, glm::radians(angle), glm::vec3(1.0f, 0.3f, 0.5f));
			glUniformMatrix4fv(glGetUniformLocation(lightningShader, "model"), 1, GL_FALSE, &model[0][0]);

			glDrawArrays(GL_TRIANGLES, 0, 36);
		}

		//glUseProgram(lampShader);
		//glUniformMatrix4fv(glGetUniformLocation(lampShader, "view"), 1, GL_FALSE, &view[0][0]);
		//glUniformMatrix4fv(glGetUniformLocation(lampShader, "projection"), 1, GL_FALSE, &projection[0][0]);

		//model = glm::mat4(1.0f);
		//model = glm::translate(model, lightPos);
		//model = glm::scale(model, glm::vec3(0.2f));
		//glUniformMatrix4fv(glGetUniformLocation(lampShader, "model"), 1, GL_FALSE, &model[0][0]);

		//glBindVertexArray(lightVAO);
		//glDrawArrays(GL_TRIANGLES, 0, 36);

		glfwSwapBuffers(window);
		glfwPollEvents();
	}

	glDeleteVertexArrays(1, &cubeVAO);
	glDeleteVertexArrays(1, &lightVAO);
	glDeleteBuffers(1, &VBO);

	glfwTerminate();
	return 0;
}

void processInput(GLFWwindow *window)
{
	if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
		glfwSetWindowShouldClose(window, true);

	if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
		camera.ProcessKeyboard(FORWARD, deltaTime);
	if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
		camera.ProcessKeyboard(BACKWARD, deltaTime);
	if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
		camera.ProcessKeyboard(LEFT, deltaTime);
	if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
		camera.ProcessKeyboard(RIGHT, deltaTime);
	if (glfwGetKey(window, GLFW_KEY_SPACE) == GLFW_PRESS)
		camera.ProcessKeyboard(UP, deltaTime);
	if (glfwGetKey(window, GLFW_KEY_LEFT_SHIFT) == GLFW_PRESS)
		camera.ProcessKeyboard(DOWN, deltaTime);
}

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

void mouse_callback(GLFWwindow* window, double xpos, double ypos)
{
	if (firstMouse)
	{
		lastX = xpos;
		lastY = ypos;
		firstMouse = false;
	}

	float xoffset = xpos - lastX;
	float yoffset = lastY - ypos; // reversed since y-coordinates go from bottom to top

	lastX = xpos;
	lastY = ypos;

	camera.ProcessMouseMovement(xoffset, yoffset);
}

// glfw: whenever the mouse scroll wheel scrolls, this callback is called
// ----------------------------------------------------------------------
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
{
	camera.ProcessMouseScroll(yoffset);
}