source: opengl-game/game-gui-sdl.cpp@ f6521fb

#include "game-gui-sdl.hpp"

#include <map>
#include <queue>

#include "consts.hpp"

using namespace std;

/*
// Temporary to allow the program using this class to receive events other than keyboard events
// Remove once I add a better game-gui wrapper for doing that
queue<SDL_Event> events;

queue<MouseEvent> mouseEvents;
*/

string GameGui_SDL::s_errorMessage;

string& GameGui_SDL::getError() {
   GameGui_SDL::s_errorMessage = SDL_GetError();

   return GameGui_SDL::s_errorMessage;
}

bool GameGui_SDL::init() {
   // may want to define SDL_INIT_NOPARACHUTE when I start handling crashes since it
   // prevents SDL from setting up its own handlers for SIG_SEGV and stuff like that

   GameGui_SDL::s_errorMessage = "No error";

   if (SDL_Init(SDL_INIT_EVERYTHING) < 0) {
      return RTWO_ERROR;
   }

   int imgFlags = IMG_INIT_PNG;
   if (!(IMG_Init(imgFlags) & imgFlags)) {
      return RTWO_ERROR;
   }

   if (TTF_Init() == -1) {
      return RTWO_ERROR;
   }

   return RTWO_SUCCESS;
}

void GameGui_SDL::shutdown() {
   SDL_Quit();
}

void* GameGui_SDL::createWindow(const string& title, int width, int height, bool fullscreen) {
   // TODO: Make an OpenGL version of the SDL_CreateWindow call as well

   // On Apple's OS X you must set the NSHighResolutionCapable Info.plist property to YES,
   // otherwise you will not receive a High DPI OpenGL canvas.

   SDL_DisplayMode dm;
   SDL_GetCurrentDisplayMode(0, &dm);

   if (fullscreen) {
      width = dm.w;
      height = dm.h;
   }

   uint32_t flags = SDL_WINDOW_VULKAN | (fullscreen ? SDL_WINDOW_FULLSCREEN : SDL_WINDOW_RESIZABLE);

   window = SDL_CreateWindow(title.c_str(),
               SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
               width, height, flags);

   return window;
}

void GameGui_SDL::destroyWindow() {
   // TODO: This function can throw some errors. They should be handled
   SDL_DestroyWindow(window);
}

void GameGui_SDL::processEvents() {
}

int GameGui_SDL::pollEvent(UIEvent* event) {
   SDL_Event e;

   /* The trackpad on OSX triggers both SDL_MOUSE and SDL_FINGER events, so just treat them both
    * as mouse events since this game isn't targeting mobile devices
    */

   if (SDL_PollEvent(&e)) {
      switch(e.type) {
         case SDL_QUIT:
            event->type = UI_EVENT_QUIT;
            break;
         case SDL_WINDOWEVENT:
            event->type = UI_EVENT_WINDOW;
            break;
         case SDL_KEYUP:
         case SDL_KEYDOWN:
            event->type = UI_EVENT_KEY;
            event->key.keycode = e.key.keysym.scancode;
            break;
         case SDL_MOUSEBUTTONDOWN:
         case SDL_FINGERDOWN:
            event->type = UI_EVENT_MOUSEBUTTONDOWN;
            break;
         case SDL_MOUSEBUTTONUP:
         case SDL_FINGERUP:
            event->type = UI_EVENT_MOUSEBUTTONUP;
            break;
         case SDL_MOUSEMOTION:
         case SDL_FINGERMOTION:
            event->type = UI_EVENT_MOUSEMOTION;
            break;
         // Ignore the following events
         case SDL_AUDIODEVICEADDED:
         case SDL_AUDIODEVICEREMOVED:
            event = nullptr;
            return 0;
            break;
         default:
            cout << "Unknown event type: 0x" << hex << e.type << dec << endl;
            event = nullptr;
            return 0;
      }

      return 1;
   }

   event = nullptr;
   return 0;
}

#ifdef GAMEGUI_INCLUDE_VULKAN

bool GameGui_SDL::createVulkanSurface(VkInstance instance, VkSurfaceKHR* surface) {
   return SDL_Vulkan_CreateSurface(window, instance, surface) ?
      RTWO_SUCCESS : RTWO_ERROR;
}

#endif

vector<const char*> GameGui_SDL::getRequiredExtensions() {
   uint32_t extensionCount = 0;
   SDL_Vulkan_GetInstanceExtensions(window, &extensionCount, nullptr);

   vector<const char*> extensions(extensionCount);
   SDL_Vulkan_GetInstanceExtensions(window, &extensionCount, extensions.data());

   return extensions;
}

void GameGui_SDL::getWindowSize(int* width, int* height) {
   SDL_GetWindowSize(window, width, height);
}