79 lines
1.8 KiB
C++
79 lines
1.8 KiB
C++
#include <iostream>
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#include "ECS.h"
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#include <GLFW/glfw3.h>
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using namespace ECS;
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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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class GravitySystem : public EntitySystem {
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public:
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GravitySystem(float amount) {
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gravityAmount = amount;
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}
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virtual ~GravitySystem() {}
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virtual void tick(World *world, float deltaTime) override {
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world->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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int main() {
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World *world = World::createWorld();
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world->registerSystem(new GravitySystem(-9.8f));
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Entity *ent = world->create();
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ent->assign<Position>(0.f, 0.f, 0.f); // assign() takes arguments and passes them to the constructor
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world->tick(1.0f);
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ComponentHandle<Position> pos = ent->get<Position>();
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std::cout << "y position after tick: " << pos->y << std::endl;
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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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/* Loop until the user closes the window */
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while (!glfwWindowShouldClose(window)) {
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/* Render here */
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glClear(GL_COLOR_BUFFER_BIT);
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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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