hdk-sdl/examples/HelloRenderer2D.cpp

#include <hdk/sdl.hpp> // Hollow Wrapper to SDL
#include <hdk/sdl/main.hpp> // Hollow Wrapper to SDL main boilerplate via hdk::sdl::ApplicationInterface & the macro HDK_SDL_MAIN_CLASS
#include <filesystem>
namespace hello_renderer_2d {
  using namespace hdk;
  namespace fs = std::filesystem;

  fs::path GetAssetsRoot() {
    const char* base = SDL_GetBasePath();
    if (!base || *base == '\0') {
      return fs::path("assets");
    }
    fs::path exe_dir(base);
    return exe_dir / ".." / "assets";
  }

  fs::path AssetPath(const fs::path& category, const fs::path& relative_path) {
    return GetAssetsRoot() / category / relative_path;
  }

  class HelloRenderer2D : public sdl::PublicApp {
    public:
      const sdl::Log& AppLog { sdl::Log::Application };
      grid::eps::TapScope taps, loud;
      sdl::evt::AllTypes events;
      const sdl::evt::EventConduit::Callback_t LOG_EVENT = [&](SDL_Event* event) {
        auto description = sdl::Event::GetDescription<1024>(event);
        AppLog.Debug("Event received: %s", description.c_str());
      };
      virtual SDL_AppResult Event(SDL_Event* event) override {
        // Get a description of the event for logging, you can adjust the buffer size as needed, defaults to 512        
        events.Trigger(event);
        return AppStatus;
      }

      sdl::Window window { nullptr };
      sdl::Renderer renderer { nullptr };
      sdl::Surface surface { nullptr };
      sdl::Texture texture { nullptr };

      virtual SDL_AppResult Init(int argc, char* argv[]) override {
        SDL_SetAppMetadata("Hello Renderer 2D", "0.0.1", "institute.ufp.hdk.sdl.examples.hello_renderer_2d");
        sdl::Log::SetPriorities(SDL_LOG_PRIORITY_DEBUG);        
        auto [w, r] = sdl::CreateWindowAndRenderer("Hello World", 800, 600, 0);
        window = w;
        renderer = r;
        if (!window || !renderer) {
          SDL_Log("Failed to create window or renderer: %s", SDL_GetError());
          return AppStatus = SDL_APP_FAILURE;
        }

        AppLog.Info("Assets root: %s", GetAssetsRoot().lexically_normal().string().c_str());
        fs::path matStoneGray01Path = AssetPath(
          "textures", "sbs_-_base_materials_pack_128x128/Base Materials 128x128/Stone/Mat_Stone_Gray_01-128x128.png");
        AppLog.Info("Example texture path: %s", matStoneGray01Path.lexically_normal().string().c_str());
        surface = sdl::Surface::LoadSurface(matStoneGray01Path.string().c_str());
        if (!surface) {
          AppLog.Error("Failed to load surface: %s", SDL_GetError());
          return AppStatus = SDL_APP_FAILURE;
        }
        texture = renderer.CreateTextureFromSurface(surface);
        if (!texture) {
          AppLog.Error("Failed to create texture from surface: %s", SDL_GetError());
          return AppStatus = SDL_APP_FAILURE;
        }

        taps << events.Quit.Attach([&](SDL_Event* event) {
          AppStatus = SDL_APP_SUCCESS;
          printf("Quit event received, exiting...\n");
        });

        //loud << events.Attach(LOG_EVENT);
        SDL_WindowID window_id = window.GetID();
        taps << events.Window[window_id].MouseLeave.Attach([&](SDL_Event* event) {
          AppLog.Info("Mouse left the window!");
          loud.PauseAll();    
        });

        taps << events.Window[window_id].MouseEnter.Attach([&](SDL_Event* event) {
          AppLog.Info("Mouse entered the window!");
          loud.ResumeAll();
        });

        taps << events.Window[window_id].Moved % [&](SDL_Event* event) {
          AppLog.Info("Window moved to (%d, %d)", event->window.data1, event->window.data2);
        };
        renderer.SetLogicalPresentation(800, 600, SDL_LOGICAL_PRESENTATION_LETTERBOX);
        renderer.SetDrawColor(255, 0, 0, 0);
        renderer.FillRect(nullptr);
        renderer.Present();
        return AppStatus;
      }

      virtual SDL_AppResult Iterate() override {
        
        renderer.SetViewport({0, 0, 800, 600});        
        renderer.SetDrawColor(0, 0, 0, 0);
        renderer.FillRect(nullptr);
        renderer.RenderTextureTiled(texture, nullptr, 2.0f, nullptr, 1.0f);
        renderer.SetDrawColor(255, 255, 255, 255);
        auto displays = sdl::Display::GetDisplays();
        renderer.DebugTextFormat(0, 0, "Displays: %d", displays.size());
        renderer.DebugTextFormat(0, 20, "Render Drivers: %d", sdl::Renderer::GetNumRenderDrivers());        
        
        renderer.SetViewport({10, 300, 800, 300});
        for(auto & display : displays) {          
          sdl::FRect fbounds = display.GetBounds();          
          fbounds *= 0.15f; // scale down for better visibility
          renderer.SetDrawColor(255, 255, 255, 255);
          renderer.RenderRect(&fbounds);
          renderer.DebugTextFormat(fbounds.x+2, fbounds.y+2, " %s ", display.GetName());
        }
        renderer.Present();
        return AppStatus;
      }
  };
}
// We tell the HDK_SDL_MAIN_CLASS macro to use our HelloRenderer2D class
HDK_SDL_MAIN_CLASS(hello_renderer_2d::HelloRenderer2D)
// this builds all the SDL main boilerplate and connects it to our HelloRenderer2D class