139 lines
5.2 KiB
C++
139 lines
5.2 KiB
C++
// ============================================================================
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// BaseScene.cpp - Push Box 基础场景实现
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// ============================================================================
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#include "BaseScene.h"
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#include <extra2d/scene/transition_scene.h>
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#include <extra2d/utils/logger.h>
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namespace pushbox {
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BaseScene::BaseScene() {
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// 设置背景颜色为黑色（窗口四周会显示这个颜色）
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setBackgroundColor(extra2d::Color(0.0f, 0.0f, 0.0f, 1.0f));
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}
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void BaseScene::onEnter() {
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extra2d::Scene::onEnter();
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// 计算并更新视口
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updateViewport();
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}
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/**
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* @brief 更新视口计算，使游戏内容在窗口中居中显示
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*/
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void BaseScene::updateViewport() {
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auto &app = extra2d::Application::instance();
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float windowWidth = static_cast<float>(app.window().getWidth());
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float windowHeight = static_cast<float>(app.window().getHeight());
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// 计算游戏内容在窗口中的居中位置
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// 保持游戏原始宽高比，进行"黑边"适配
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float scaleX = windowWidth / GAME_WIDTH;
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float scaleY = windowHeight / GAME_HEIGHT;
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// 使用较小的缩放比例，确保游戏内容完整显示在窗口中
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float scale = std::min(scaleX, scaleY);
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scaledGameWidth_ = GAME_WIDTH * scale;
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scaledGameHeight_ = GAME_HEIGHT * scale;
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// 计算居中偏移，使游戏内容在窗口中水平和垂直居中
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viewportOffsetX_ = (windowWidth - scaledGameWidth_) * 0.5f;
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viewportOffsetY_ = (windowHeight - scaledGameHeight_) * 0.5f;
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// 设置视口大小为游戏逻辑分辨率
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setViewportSize(GAME_WIDTH, GAME_HEIGHT);
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// 创建并设置相机
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auto camera = extra2d::makePtr<extra2d::Camera>();
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// 设置正交投影，覆盖整个游戏逻辑区域
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// 注意：对于2D游戏，Y轴向下增长，所以bottom > top
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camera->setViewport(0.0f, GAME_WIDTH, GAME_HEIGHT, 0.0f);
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setCamera(camera);
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}
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/**
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* @brief 渲染时调用，设置居中视口
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* @param renderer 渲染后端
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*/
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void BaseScene::onRender(extra2d::RenderBackend &renderer) {
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// 检查窗口大小是否改变，如果改变则更新视口
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auto &app = extra2d::Application::instance();
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float currentWindowWidth = static_cast<float>(app.window().getWidth());
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float currentWindowHeight = static_cast<float>(app.window().getHeight());
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// 如果窗口大小改变，重新计算视口
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float expectedWidth = scaledGameWidth_ + viewportOffsetX_ * 2.0f;
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float expectedHeight = scaledGameHeight_ + viewportOffsetY_ * 2.0f;
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if (std::abs(currentWindowWidth - expectedWidth) > 1.0f ||
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std::abs(currentWindowHeight - expectedHeight) > 1.0f) {
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E2D_LOG_INFO("BaseScene::onRender - window size changed from ({} x {}) to "
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"({} x {}), updating viewport",
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expectedWidth, expectedHeight, currentWindowWidth,
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currentWindowHeight);
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updateViewport();
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}
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// 设置视口为居中区域
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renderer.setViewport(
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static_cast<int>(viewportOffsetX_), static_cast<int>(viewportOffsetY_),
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static_cast<int>(scaledGameWidth_), static_cast<int>(scaledGameHeight_));
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// 调用父类的 onRender 进行实际渲染
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extra2d::Scene::onRender(renderer);
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}
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/**
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* @brief 渲染场景内容，确保视口正确设置
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* @param renderer 渲染后端
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*/
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void BaseScene::renderContent(extra2d::RenderBackend &renderer) {
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// 如果视口参数未初始化（onEnter 还没被调用），先初始化
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if (scaledGameWidth_ <= 0.0f || scaledGameHeight_ <= 0.0f) {
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updateViewport();
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}
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// 检查窗口大小是否改变
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auto &app = extra2d::Application::instance();
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float currentWindowWidth = static_cast<float>(app.window().getWidth());
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float currentWindowHeight = static_cast<float>(app.window().getHeight());
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float expectedWidth = scaledGameWidth_ + viewportOffsetX_ * 2.0f;
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float expectedHeight = scaledGameHeight_ + viewportOffsetY_ * 2.0f;
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if (std::abs(currentWindowWidth - expectedWidth) > 1.0f ||
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std::abs(currentWindowHeight - expectedHeight) > 1.0f) {
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updateViewport();
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}
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// 检查当前场景是否作为 TransitionScene 的子场景被渲染
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bool isChildOfTransition = false;
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if (auto parent = getParent()) {
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if (dynamic_cast<extra2d::TransitionScene *>(parent.get())) {
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isChildOfTransition = true;
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}
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}
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if (isChildOfTransition) {
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// 作为 TransitionScene 的子场景时，需要设置正确的投影矩阵
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// 使用游戏逻辑分辨率作为投影区域，让 TransitionScene 控制整体视口
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auto camera = getActiveCamera();
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if (camera) {
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// 设置投影矩阵覆盖整个游戏逻辑区域
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renderer.setViewProjection(camera->getViewProjectionMatrix());
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}
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// 渲染场景内容（投影矩阵已设置，直接渲染）
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batchUpdateTransforms();
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renderer.beginSpriteBatch();
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render(renderer);
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renderer.endSpriteBatch();
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} else {
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// 正常渲染时，调用父类的 renderContent 处理视口和投影
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renderer.setViewport(static_cast<int>(viewportOffsetX_),
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static_cast<int>(viewportOffsetY_),
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static_cast<int>(scaledGameWidth_),
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static_cast<int>(scaledGameHeight_));
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extra2d::Scene::renderContent(renderer);
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}
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}
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} // namespace pushbox
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