257 lines
8.3 KiB
C++
257 lines
8.3 KiB
C++
#include <glad/glad.h>
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#include <GLFW/glfw3.h>
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#include <iostream>
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#include "Rendering/Shader.h"
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#include "ECS/ECS.h"
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using namespace ECS;
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World *world = World::createWorld();
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struct Position {
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Position(float x, float y, float z) : x(x), y(y), z(z) {}
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Position() : x(0.f), y(0.f), z(0.f) {}
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float x;
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float y;
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float z;
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};
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struct Movement {
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Movement(float speedX, float speedY, float speedZ) : speedX(speedX), speedY(speedY), speedZ(speedZ) {}
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float speedX;
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float speedY;
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float speedZ;
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int movingX = 0;
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int movingY = 0;
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int movingZ = 0;
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float velocityX = 0.0f;
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float velocityY = 0.0f;
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float velocityZ = 0.0f;
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};
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struct InputEvent {
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int key;
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int action;
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};
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class GravitySystem : public EntitySystem {
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public:
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explicit GravitySystem(float amount) {
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gravityAmount = amount;
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}
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void tick(World *pWorld, float deltaTime) override {
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pWorld->each<Position>([&](Entity *ent, ComponentHandle<Position> position) {
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position->y += gravityAmount * deltaTime;
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});
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}
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private:
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float gravityAmount;
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};
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class PositionDebugOutputSystem : public EntitySystem {
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public:
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void tick(World *pWorld, float deltaTime) override {
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pWorld->each<Position>([&](Entity *ent, ComponentHandle<Position> position) {
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std::cout << ent->getEntityId() << ": "
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<< position->x << ", "
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<< position->y << ", "
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<< position->z
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<< std::endl;
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});
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}
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};
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class KeyboardMovementSystem : public EntitySystem, public EventSubscriber<InputEvent> {
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void configure(World *pWorld) override {
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pWorld->subscribe<InputEvent>(this);
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}
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void receive(World *pWorld, const InputEvent &event) override {
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if (event.key == GLFW_KEY_W) {
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world->each<Movement>([&](Entity *ent, ComponentHandle<Movement> movement) {
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if (event.action == GLFW_PRESS) {
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movement->movingZ = -1;
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} else if (event.action == GLFW_RELEASE) {
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movement->movingZ = 0;
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}
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});
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} else if (event.key == GLFW_KEY_S) {
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world->each<Movement>([&](Entity *ent, ComponentHandle<Movement> movement) {
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if (event.action == GLFW_PRESS) {
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movement->movingZ = 1;
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} else if (event.action == GLFW_RELEASE) {
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movement->movingZ = 0;
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}
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});
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} else if (event.key == GLFW_KEY_A) {
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world->each<Movement>([&](Entity *ent, ComponentHandle<Movement> movement) {
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if (event.action == GLFW_PRESS) {
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movement->movingX = 1;
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} else if (event.action == GLFW_RELEASE) {
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movement->movingX = 0;
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}
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});
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} else if (event.key == GLFW_KEY_D) {
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world->each<Movement>([&](Entity *ent, ComponentHandle<Movement> movement) {
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if (event.action == GLFW_PRESS) {
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movement->movingX = -1;
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} else if (event.action == GLFW_RELEASE) {
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movement->movingX = 0;
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}
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});
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}
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std::cout << "MyEvent was emitted!" << std::endl;
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}
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void tick(World *pWorld, float deltaTime) override {
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pWorld->each<Position, Movement>(
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[&](Entity *ent, ComponentHandle<Position> position, ComponentHandle<Movement> movement) {
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position->x += movement->movingX * movement->speedX * deltaTime;
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position->y += movement->movingY * movement->speedY * deltaTime;
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position->z += movement->movingZ * movement->speedZ * deltaTime;
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});
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}
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void unconfigure(World *pWorld) override {
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pWorld->unsubscribeAll(this);
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}
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};
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static void key_callback(GLFWwindow *window, int key, int scancode, int action, int mods) {
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if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
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glfwSetWindowShouldClose(window, GLFW_TRUE);
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world->emit<InputEvent>({key, action});
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}
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int main() {
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world->registerSystem(new GravitySystem(-9.8f));
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world->registerSystem(new PositionDebugOutputSystem());
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world->registerSystem(new KeyboardMovementSystem());
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Entity *ent = world->create();
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ent->assign<Position>(0.f, 0.f, 0.f);
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ent->assign<Movement>(1.f, 1.f, 1.f);
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ComponentHandle<Position> pos = ent->get<Position>();
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GLFWwindow *window;
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/* Initialize the library */
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if (!glfwInit())
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return -1;
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/* Create a windowed mode window and its OpenGL context */
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window = glfwCreateWindow(640, 480, "Hello World", NULL, NULL);
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if (!window) {
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glfwTerminate();
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return -1;
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}
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/* Make the window's context current */
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glfwMakeContextCurrent(window);
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glfwSetKeyCallback(window, key_callback);
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// glad: load all OpenGL function pointers
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// ---------------------------------------
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if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
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{
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std::cout << "Failed to initialize GLAD" << std::endl;
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return -1;
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}
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Shader defaultShader("Shaders/default-vertex.vs", "Shaders/default-fragment.fs");
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// set up vertex data (and buffer(s)) and configure vertex attributes
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// ------------------------------------------------------------------
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float vertices[] = {
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// positions // colors
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0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom right
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-0.5f, -0.5f, 0.0f, 0.0f, 1.0f, 0.0f, // bottom left
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0.0f, 0.5f, 0.0f, 0.0f, 0.0f, 1.0f // top
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};
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unsigned int indices[] = { // note that we start from 0!
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0, 1, 2 // first Triangle
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};
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unsigned int VBO, VAO, EBO;
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glGenVertexArrays(1, &VAO);
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glGenBuffers(1, &VBO);
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glGenBuffers(1, &EBO);
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// bind the Vertex Array Object first, then bind and set vertex buffer(s), and then configure vertex attributes(s).
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glBindVertexArray(VAO);
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glBindBuffer(GL_ARRAY_BUFFER, VBO);
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glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
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// position attribute
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void*)0);
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glEnableVertexAttribArray(0);
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// color attribute
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glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void*)(3* sizeof(float)));
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glEnableVertexAttribArray(1);
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glEnableVertexAttribArray(0);
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// note that this is allowed, the call to glVertexAttribPointer registered VBO as the vertex attribute's bound vertex buffer object so afterwards we can safely unbind
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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// remember: do NOT unbind the EBO while a VAO is active as the bound element buffer object IS stored in the VAO; keep the EBO bound.
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//glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
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// You can unbind the VAO afterwards so other VAO calls won't accidentally modify this VAO, but this rarely happens. Modifying other
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// VAOs requires a call to glBindVertexArray anyways so we generally don't unbind VAOs (nor VBOs) when it's not directly necessary.
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glBindVertexArray(0);
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double timeInLastFrame = glfwGetTime();
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double elapsed_time = 0.0;
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/* Loop until the user closes the window */
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while (!glfwWindowShouldClose(window)) {
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// Delta time handling
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double delta = glfwGetTime() - timeInLastFrame;
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timeInLastFrame = glfwGetTime();
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elapsed_time += delta;
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std::cout << "Elapsed time: " << elapsed_time << std::endl;
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world->tick(delta);
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/* Render here */
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// render
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// ------
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glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT);
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// draw our first triangle
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defaultShader.use();
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glBindVertexArray(VAO); // seeing as we only have a single VAO there's no need to bind it every time, but we'll do so to keep things a bit more organized
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glDrawArrays(GL_TRIANGLES, 0, 3);
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// glBindVertexArray(0); // no need to unbind it every time
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/* Swap front and back buffers */
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glfwSwapBuffers(window);
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/* Poll for and process events */
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glfwPollEvents();
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}
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glfwTerminate();
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return 0;
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}
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