Extra2D/examples/msdf_text_demo/main.cpp

/**
 * @file main.cpp
 * @brief MSDF 文字渲染示例
 *
 * 演示 MSDF 字体的高质量文字渲染功能，使用 RenderService 服务。
 */

#include <extra2d/extra2d.h>
#include <extra2d/services/render_service.h>

using namespace extra2d;

namespace {

Ref<FontAsset> g_font;

} // namespace

int main(int argc, char **argv) {
  E2D_INFO(CAT_APP, "============================");
  E2D_INFO(CAT_APP, "MSDF Text Rendering Demo");
  E2D_INFO(CAT_APP, "============================");

  auto &app = Application::instance();
  app.name = "MSDF Text Demo";

  app.useService<ILogger, ConsoleLogger>();
  app.useService<IEventService, EventService>();
  app.useService<ITimerService, TimerService>();
  app.useService<IAssetService, AssetService>();
  app.useService<IRenderService, RenderService>();

  app.useModule<WindowModule>([](WindowCfg &cfg) {
    cfg.title = "Extra2D - MSDF Text Demo";
    cfg.width = 1280;
    cfg.height = 720;
  });

  app.useModule<RenderModule>([](RenderCfg &cfg) {
    cfg.glMajor = 4;
    cfg.glMinor = 5;
    cfg.vsync = true;
  });

  if (!app.init()) {
    E2D_ERROR(CAT_APP, "应用初始化失败！");
    return -1;
  }

  auto renderService = app.service<IRenderService>();
  if (!renderService) {
    E2D_ERROR(CAT_APP, "无法获取 RenderService");
    app.shutdown();
    return -1;
  }

  auto assetService = app.service<IAssetService>();
  if (!assetService) {
    E2D_ERROR(CAT_APP, "无法获取 AssetService");
    app.shutdown();
    return -1;
  }

  auto fontHandle = assetService->load<FontAsset>("assets/simhei.msdf.png");
  g_font = fontHandle.get();
  if (!g_font || !g_font->loaded()) {
    E2D_ERROR(CAT_APP, "无法加载字体");
    app.shutdown();
    return -1;
  }

  E2D_INFO(CAT_APP, "字体加载成功，字体大小: {}", g_font->fontSize());

  auto eventService = app.service<IEventService>();
  if (eventService) {
    eventService->on(EventType::KeyPressed, [&app](Event &e) {
      auto &keyEvent = std::get<KeyEvent>(e.data);
      if (keyEvent.key == static_cast<i32>(Key::Escape)) {
        E2D_INFO(CAT_INPUT, "ESC 键按下，退出应用");
        app.quit();
      }
    });
  }

  renderService->onRender([](IRenderService *render, f32 dt) {
    if (!g_font) {
      return;
    }

    float y = 60.0f;

    ::extra2d::TextConfig config;
    config.fontSize = 48.0f;
    config.color = glm::vec4(1.0f, 1.0f, 1.0f, 1.0f);

    render->drawText(g_font.get(), U"MSDF Text Rendering Demo", 20.0f, y,
                     config);
    y += 80.0f;

    config.fontSize = 32.0f;
    render->drawText(g_font.get(), U"Extra2D Engine - 2D Game Engine", 20.0f, y,
                     config);
    y += 60.0f;

    config.fontSize = 24.0f;
    config.color = glm::vec4(0.7f, 0.9f, 1.0f, 1.0f);
    render->drawText(g_font.get(), U"High quality text rendering with MSDF",
                     20.0f, y, config);
    y += 45.0f;

    config.fontSize = 20.0f;
    config.color = glm::vec4(1.0f, 0.8f, 0.4f, 1.0f);
    render->drawText(g_font.get(),
                     U"Multi-channel Signed Distance Field technology", 20.0f,
                     y, config);
    y += 35.0f;

    config.color = glm::vec4(0.6f, 1.0f, 0.6f, 1.0f);
    render->drawText(g_font.get(),
                     U"Provides high quality, scalable vector font rendering",
                     20.0f, y, config);
    y += 50.0f;

    config.fontSize = 28.0f;
    config.color = glm::vec4(1.0f, 1.0f, 1.0f, 1.0f);
    render->drawText(g_font.get(), U"Character Test:", 20.0f, y, config);
    y += 45.0f;

    config.fontSize = 22.0f;
    config.color = glm::vec4(0.9f, 0.9f, 0.9f, 1.0f);
    render->drawText(g_font.get(), U"ABCDEFGHIJKLMNOPQRSTUVWXYZ", 20.0f, y,
                     config);
    y += 35.0f;
    render->drawText(g_font.get(), U"abcdefghijklmnopqrstuvwxyz", 20.0f, y,
                     config);
    y += 35.0f;
    render->drawText(g_font.get(), U"0123456789!@#$%^&*()[]{}<>", 20.0f, y,
                     config);

    static int frameCounter = 0;
    if (++frameCounter % 60 == 0) {
      auto stats = render->stats();
      E2D_DEBUG(CAT_RENDER, "FPS: {:.1f}, Draw Calls: {}", stats.fps,
                stats.drawCalls);
    }
  });

  E2D_INFO(CAT_APP, "开始主循环...");
  app.run();
  E2D_INFO(CAT_APP, "应用结束");

  app.shutdown();

  return 0;
}