main.cpp

#include "glad/glad.h"
#include "GLFW/glfw3.h"
#include "test/Camera.h"
#include <iostream>
#include "Shader.hpp"
#include "Model.hpp"
void framebuffer_size_callback(GLFWwindow* window, int width, int height);
void processInput(GLFWwindow *window);
void mouse_callback(GLFWwindow *window, double xpos, double ypos);
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;
int cursor = 0;
float deltaTime = 0.0f;
float lastFrame = 0.0f;
const char *vertexShaderSource = "#version 330 core\n"
								 "layout (location = 0) in vec3 aPos;\n"
								 "void main()\n"
								 "{\n"
								 "   gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);\n"
								 "}\0";
const char *fragmentShaderSource = "#version 330 core\n"
								   "out vec4 FragColor;\n"
								   "void main()\n"
								   "{\n"
								   "   FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);\n"
								   "}\n\0";

int main()
{
	// glfw: initialize and configure
	// ------------------------------
	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

	// glfw window creation
	// --------------------
	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);
	// glad: load all OpenGL function pointers
	// ---------------------------------------
	if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
	{
		std::cout << "Failed to initialize GLAD" << std::endl;
		return -1;
	}
	glEnable(GL_DEPTH_TEST);
	Shader shader("shaders/vertex.glsl", "shaders/fragment.glsl");
	//Model model("./resources/elf/elf.obj");
    Model model("./resources/backpack/backpack.obj");

	while (!glfwWindowShouldClose(window))
	{
		// input
		// -----
		processInput(window);
		glm::mat4 projection = glm::perspective(glm::radians(camera.Zoom), (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
		float currentFrame = glfwGetTime();
		deltaTime = currentFrame - lastFrame;
		lastFrame = currentFrame;
		// render
		// ------
		glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
		glm::mat4 view = camera.GetViewMatrix();
		glm::mat4 modelMatrix = glm::mat4(1.0f);

		// draw our first triangle
		glUseProgram(shader.ID);

		shader.setMat4("projection", projection);
		shader.setMat4("view", view);
		shader.setMat4("model", modelMatrix);

		model.Draw(shader);

		 glBindVertexArray(0); // no need to unbind it every time

		// glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
		// -------------------------------------------------------------------------------
		glfwSwapBuffers(window);
		glfwPollEvents();
	}

	return 0;
}

// process all input: query GLFW whether relevant keys are pressed/released this frame and react accordingly
// ---------------------------------------------------------------------------------------------------------
void processInput(GLFWwindow *window)
{
	static float lastpress;

	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_Q) == GLFW_PRESS)
		camera.ProcessKeyboard(UP, deltaTime);
	if (glfwGetKey(window, GLFW_KEY_E) == GLFW_PRESS)
		camera.ProcessKeyboard(DOWN, deltaTime);

}

// glfw: whenever the window size changed (by OS or user resize) this callback function executes
// ---------------------------------------------------------------------------------------------
void framebuffer_size_callback(GLFWwindow* window, int width, int height)
{
	// make sure the viewport matches the new window dimensions; note that width and
	// height will be significantly larger than specified on retina displays.
	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;
	if (!cursor)
	{
		camera.ProcessMouseMovement(xoffset, yoffset);
	}
}