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109 lines
3.2 KiB
C++
109 lines
3.2 KiB
C++
#include "components/point.hpp"
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#include "components/player.hpp"
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#include "components/solid.hpp"
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#include "components/texture.hpp"
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#include "components/velocity.hpp"
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#include "window.hpp"
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#include <chrono>
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#include <iostream>
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#include <thread>
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#include <entt/entt.hpp>
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#include <SDL2/SDL.h>
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constexpr std::chrono::microseconds FRAME_TIME (1'000'000 / 60);
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static bool handleInputs(entt::registry& registry);
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int main()
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{
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if (auto err = sdl2Initialize(); err)
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return err;
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entt::registry registry;
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{
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const auto ent = registry.create();
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registry.emplace<Player>(ent);
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registry.emplace<Point>(ent, 0.f, WINDOW_HEIGHT - 200.f);
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registry.emplace<Velocity>(ent, 0.f, 0.f);
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registry.emplace<Texture>(ent, "img/player.png");
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}
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{
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const auto ent = registry.create();
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registry.emplace<Point>(ent, 0.f, 0.f);
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registry.emplace<Texture>(ent, "img/level.png");
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registry.emplace<Solid>(ent, "img/level.png");
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}
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do {
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const auto now = std::chrono::high_resolution_clock::now();
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SDL_RenderClear(renderer);
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registry.view<Texture, Point>().each([](auto& tex, auto& p) { tex(renderer, p); });
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SDL_RenderPresent(renderer);
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registry.view<Velocity, Point>().each([](auto& v, auto& p) { p += v; });
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registry.view<Solid, Point>().each(
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[®istry](auto& s, auto& p) {
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registry.view<Player, Point, Velocity, Texture>().each(
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[&s, &p](auto& _, auto& pp, auto& pv, auto& t) {
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const auto c = s.collision(pp + t.dim());
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if (c) {
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if (std::abs(c) > 1.f)
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pv.y = c * 0.5f;
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else
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pv.y = 0.f;
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} else {
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pv.y += 0.1f;
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}
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});
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});
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std::this_thread::sleep_until(now + FRAME_TIME);
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} while (handleInputs(registry));
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}
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bool handleInputs(entt::registry& registry)
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{
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bool quit = false;
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for (SDL_Event e; SDL_PollEvent(&e);) {
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if (e.type == SDL_QUIT) {
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quit = true;
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} else if (e.type == SDL_KEYDOWN && !e.key.repeat) {
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auto view = registry.view<Player, Velocity>();
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switch (e.key.keysym.sym) {
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case SDLK_d:
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view.each([](Player& p, Velocity& v) { v.x += 1.5f; });
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break;
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case SDLK_a:
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view.each([](Player& p, Velocity& v) { v.x -= 1.5f; });
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break;
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case SDLK_SPACE:
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view.each([](Player& p, Velocity& v) { if (v.y <= 0.f) v.y -= 3.f; });
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break;
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}
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} else if (e.type == SDL_KEYUP && !e.key.repeat) {
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auto view = registry.view<Player, Velocity>();
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switch (e.key.keysym.sym) {
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case SDLK_d:
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view.each([](Player& p, Velocity& v) { v.x -= 1.5f; });
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break;
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case SDLK_a:
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view.each([](Player& p, Velocity& v) { v.x += 1.5f; });
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break;
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}
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}
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}
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return !quit;
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}
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