Tower-Defense/src/render/WorldRenderer.cpp

#include "render/WorldRenderer.h"
#include "render/loader/WorldLoader.h"
#include "render/Renderer.h"
#include "render/gui/imgui/imgui.h"
#include "window/Display.h"
#include "game/client/ClientGame.h"

#include <iostream>

namespace td {
namespace render {

void WorldRenderer::loadModels() {
    std::cout << "World Created !\n";
    m_WorldVao = std::make_unique<GL::VertexArray>(std::move(WorldLoader::loadWorldModel(m_World)));
    m_MobVao = std::make_unique<GL::VertexArray>(std::move(WorldLoader::loadMobModel()));
    m_SelectTileVao = std::make_unique<GL::VertexArray>(std::move(WorldLoader::loadTileSelectModel()));
    std::cout << "Vertex Count : " << m_WorldVao->getVertexCount() << std::endl;
}

WorldRenderer::WorldRenderer(game::World* world, client::ClientGame* client) : m_Client(client), m_Renderer(m_Client->getRenderer()), m_World(world) {
    m_Renderer->setZoom(m_Zoom);
    m_Renderer->setCamMovement({});
}

void WorldRenderer::updateCursorPos() {
    m_CursorPos = getCursorWorldPos();
}

void WorldRenderer::update() {
    if (m_WorldVao == nullptr)
        return;
    ImGuiIO& io = ImGui::GetIO();
    if (io.MouseDown[0] && !ImGui::IsAnyItemActive()) {
        ImVec2 mouseDelta = ImGui::GetIO().MouseDelta;
        const float relativeX = mouseDelta.x / (float)Display::getWindowWidth() * 2;
        const float relativeY = mouseDelta.y / (float)Display::getWindowHeight() * 2;
        moveCam(relativeX, relativeY, Display::getAspectRatio());
    }
    if (io.MouseWheel != 0) {
        changeZoom(io.MouseWheel);
    }
    updateCursorPos();
    if (ImGui::IsMouseClicked(0)) {
        if (!m_TowerPlacePopupOpened) {
            m_HoldCursorPos = { io.MousePos.x, io.MousePos.y };
        } else {
            m_TowerPlacePopupOpened = false;
        }
    }
}

void WorldRenderer::renderWorld() const {
    m_Renderer->renderVAO(*m_WorldVao);
}

void WorldRenderer::renderMobs() const {
    for (game::MobPtr mob : m_World->getMobList()) {
        Renderer::Model model;
        model.vao = m_MobVao.get();
        model.positon = { mob->getX(), mob->getY() };
        m_Renderer->renderModel(model);
    }
}

void WorldRenderer::renderTowers() const {
    if (!m_TowersCache.isEmpty())
        m_Renderer->renderVAO(m_TowersCache.getVertexArray());
}

void WorldRenderer::renderTileSelect() const {
    Renderer::Model tileSelectModel;
    tileSelectModel.vao = m_SelectTileVao.get();
    tileSelectModel.positon = { (int)m_CursorPos.x, (int)m_CursorPos.y };

    m_Renderer->renderModel(tileSelectModel);
}

void WorldRenderer::render() {
    if (m_WorldVao == nullptr)
        return;
    renderWorld();
    renderMobs();
    renderTowers();
    renderTileSelect();
    detectClick();
    renderPopups();
}

WorldRenderer::~WorldRenderer() {

}

void WorldRenderer::moveCam(float relativeX, float relativeY, float aspectRatio) {
    if (m_WorldVao == nullptr)
        return;
    float movementX = -relativeX / m_Zoom * aspectRatio;
    float movementY = relativeY / m_Zoom;
    m_Renderer->setCamMovement({ movementX, movementY });
}

void WorldRenderer::changeZoom(float zoomStep) {
    if (m_WorldVao == nullptr)
        return;
    static float sensibility = 1.5f;
    if (zoomStep < 0) {
        m_Zoom /= -zoomStep * sensibility;
    } else {
        m_Zoom *= zoomStep * sensibility;
    }
    m_Renderer->setZoom(m_Zoom);
    m_Renderer->setCamMovement({});
}

void WorldRenderer::click() {
    if (m_Client->getWorld().CanPlaceLittleTower(getClickWorldPos(), m_Client->getPlayer()->getID())) {
        ImGui::OpenPopup("TowerPlace");
        m_TowerPlacePopupOpened = true;
    }
}

void WorldRenderer::setCamPos(float camX, float camY) {
    m_CamPos = { camX, camY };
    m_Renderer->setCamPos(m_CamPos);
}

void WorldRenderer::renderPopups() const {
    if (ImGui::BeginPopup("TowerPlace")) {
        for (int i = 0; i < (int)game::TowerType::TowerCount; i++) {
            game::TowerType towerType = game::TowerType(i);
            const game::TowerInfo& towerInfo = game::getTowerInfo(towerType);
            if (!towerInfo.isBigTower() || (towerInfo.isBigTower() && m_Client->getWorld().CanPlaceBigTower(getClickWorldPos(), m_Client->getPlayer()->getID()))) {
                if (ImGui::Button(game::getTowerInfo(towerType).getName().c_str())) {
                    m_Client->PlaceTower(towerType, getClickWorldPos());
                    ImGui::CloseCurrentPopup();
                    break;
                }
                if (ImGui::IsItemHovered()) {
                    ImGui::SetTooltip(game::getTowerInfo(towerType).getDescription().c_str(), "%s");
                }
            }
        }
        ImGui::EndPopup();
    }
}

void WorldRenderer::detectClick() {
    ImGuiIO& io = ImGui::GetIO();
    if (ImGui::IsMouseReleased(0) && !ImGui::IsAnyItemHovered() && !ImGui::IsAnyItemFocused()) {
        glm::vec2 cursorPos = { io.MousePos.x, io.MousePos.y };
        if (cursorPos == m_HoldCursorPos) {
            click();
        }
    }
}

void WorldRenderer::addTower(game::TowerPtr tower) {
    const WorldLoader::RenderData& renderData = WorldLoader::loadTowerModel(tower);
    m_TowersCache.addData(tower->getID(), renderData.positions, renderData.colors);
    m_TowersCache.updateVertexArray();
}

void WorldRenderer::removeTower(game::TowerPtr tower) {
    m_TowersCache.removeData(tower->getID());
    m_TowersCache.updateVertexArray();
}

glm::vec2 WorldRenderer::getCursorWorldPos() const {
    ImGuiIO& io = ImGui::GetIO();
    return m_Renderer->getCursorWorldPos({ io.MousePos.x, io.MousePos.y }, Display::getAspectRatio(), m_Zoom, Display::getWindowWidth(), Display::getWindowHeight());
}

glm::vec2 WorldRenderer::getClickWorldPos() const {
    return m_Renderer->getCursorWorldPos(m_HoldCursorPos, Display::getAspectRatio(), m_Zoom, Display::getWindowWidth(), Display::getWindowHeight());
}

} // namespace render
} // namespace td