cs381/as5/as5.cpp

#include "AudioDevice.hpp"
#include "Color.hpp"
#include "Keyboard.hpp"
#include "Matrix.hpp"
#include "Mesh.hpp"
#include "Model.hpp"
#include "RadiansDegrees.hpp"
#include "Vector3.hpp"
#include "raylib.h"
#include <concepts>
#include <functional>
#include <memory>
#include <optional>
#include <raylib-cpp.hpp>
#include <vector>

#define SKYBOX_IMPLEMENTATION
#include "skybox.hpp"

void DrawBoundedModel(raylib::Model &model, auto transformer) {
    // store the original transform to apply a different transform to the
    // model without affecting the next time we draw
    raylib::Matrix oldTransform = model.GetTransform();

    // apply the transform that we get from whatever the transformer callback
    // gives us
    raylib::Matrix transform = transformer(model.GetTransform());

    // apply the transform that we got from the transformer to the model
    model.SetTransform(transform);

    // draw the model, passing the origin and default scale as arguments since
    // the transform is already applied to the model
    model.Draw({ 0, 0, 0 }, 1.0f, raylib::Color::White());

    // get the bounding box of the model after applying the transform
    auto box = model.GetTransformedBoundingBox();

    // draw the bounding box of the model using raylib's built in function
    DrawBoundingBox(box, raylib::Color::White());

    // restore the model's transform to its original state so that the next time we
    // draw the model, it doesn't have the previous transform applied to it
    model.SetTransform(oldTransform);
}

class Component {
public:
    struct Entity *entity;
    virtual void Setup() = 0;
    virtual void Update(float dt) = 0;
    virtual void Cleanup() = 0;
};

struct Entity {
    std::vector<std::shared_ptr<Component>> components;

    template<std::derived_from<Component> T>
    T &AddComponent() {
        std::shared_ptr<Component> out = components.emplace_back(std::make_shared<T>());
        out->entity = this;
        return (T &)*out;
    }

    template<std::derived_from<Component> T>
    std::optional<std::reference_wrapper<T>> GetComponent() const {
        for (auto &c : components) {
            T *cast = dynamic_cast<T *>(c.get());
            if (cast) {
                return *cast;
            }
        }

        return { };
    }
};

struct TransformComponent : public Component {
    raylib::Vector3 position = { 0, 0, 0 };
    raylib::Quaternion rotation = raylib::Quaternion::Identity();

    void Setup() override { }

    void Update(float dt) override { }

    void Cleanup() override { }
};

struct DrawModelComponent : public Component {
    raylib::Model *model;

    void Setup() override { }

    void Update(float dt) override {
        DrawBoundedModel(*model, [this](raylib::Transform old) {
            auto t = entity->GetComponent<TransformComponent>();
            if (t) {
                return old
                    .Translate(t->get().position)
                    .Rotate(t->get().rotation);
            }

            return old;
        });
    }

    void Cleanup() override { }
};

template<typename T>
struct Delegate { };

template<typename TReturn, typename... TArgs>
struct Delegate<TReturn(TArgs...)> {
    std::vector<std::function<void(int)>> functions;

    void connect(const std::function<TReturn(TArgs ...)> &func) {
        functions.push_back(func);
    }

    void operator+=(const std::function<TReturn(TArgs ...)> &func) {
        connect(func);
    }

    void operator()(int arg) {
        static_assert(
            std::is_same_v<TReturn, void>,
            "EC HW: Delegate only supports void return type");

        for (const auto &func : functions) {
            f(std::forward<TArgs>(arg)...);
        }
    }
};

raylib::Degree angle_normalize(raylib::Degree angle) {
    float decimal = float(angle) - int(angle);
    int normalized = (int(angle) % 360 + 360) % 360;
    return raylib::Degree(normalized + decimal);
}

int main() {
    raylib::Window window(800, 600, "CS381 - Assignment 5");
    window.SetState(FLAG_WINDOW_RESIZABLE);
    raylib::AudioDevice audio;

    raylib::Model penguin("models/penguin.glb");
    raylib::Transform penguinTransform = raylib::Transform::Identity()
        .Scale(40, 40, 40);
    penguin.SetTransform(penguinTransform);

    raylib::Camera3D camera(
        { 0, 400, -40 },
        { 0, -0.25f, 1 },
        { 0, 1, 0 },
        45.0f);

    raylib::Model ground = raylib::Mesh::Plane(10000, 10000, 50, 50, 25);

    raylib::Texture snowTexture("textures/snow.jpg");
    ground.GetMaterials()[0].maps[MATERIAL_MAP_DIFFUSE].texture = snowTexture;

    cs381::SkyBox skybox("textures/skybox.png");

    std::vector<Entity> entities;

    Entity &e = entities.emplace_back();
    e.AddComponent<TransformComponent>();
    e.AddComponent<DrawModelComponent>();
    e.GetComponent<DrawModelComponent>()->get().model = &penguin;

    window.SetTargetFPS(60); // save cpu cycles

    while (!window.ShouldClose()) {
        window.BeginDrawing();
        window.ClearBackground(raylib::Color::Gray());

        float dt = window.GetFrameTime();

        camera.BeginMode();
        skybox.Draw();

        ground.Draw({ 0, 0, 0 }, 1.0f, raylib::Color::White());

        for (const Entity &e : entities) {
            for (const std::shared_ptr<Component> &c : e.components) {
                c->Update(dt);
            }
        }

        camera.EndMode();
        window.EndDrawing();
    }

    return 0;
}