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 |  
#include <QApplication>
#include <QFont>
#include <QPushButton>
#include <QWidget>
#include <QShowEvent>
 
#ifdef Q_WS_WIN
#include <SDL.h>
#elif defined Q_WS_X11
#include <SDL/SDL.h>
#endif
 
/* PIEGE: main est redéfini par SDL.h comme SDL_Main.
		  On retire donc la définition puisque Qt le gère
*/
#undef main
 
#include <vector>
#include <cstdlib>
#include <ctime>
 
class SDLWidget : public QWidget
{
	Q_OBJECT
 
public:
	SDLWidget()
	: windowInitialized(false), screen(0), StarNumbers(100)
	{
		setAttribute(Qt::WA_PaintOnScreen);
		setAttribute(Qt::WA_NoSystemBackground);
 
		starfield.resize(100);
		initStarfield();
 
		// Le bon vieux mode 13h (simulé, c'est sûr :p )
		resize(320, 200);
	}
 
	virtual ~SDLWidget()
	{
		SDL_Quit();
	}
 
protected:
	virtual void showEvent(QShowEvent *e)
	{
		(void)e;
 
		if(!windowInitialized)
		{
			// C'est ici qu'on dis à SDL d'utiliser notre widget
			char windowid[64];
#ifdef Q_WS_WIN
			sprintf(windowid, "SDL_WINDOWID=0x%lx", reinterpret_cast<qlonglong>(winId()));
#elif defined Q_WS_X11
			sprintf(windowid, "SDL_WINDOWID=0x%lx", winId());
#else
			qFatal("Fatal: cast du winId() inconnu pour votre plate-forme; toute information est la bienvenue!");
#endif
			SDL_putenv(windowid);
 
			// Initialisation du système vidéo de SDL
			SDL_Init(SDL_INIT_VIDEO);
			screen = SDL_SetVideoMode(width(), height(), 32, SDL_SWSURFACE);
			windowInitialized = true;
		}
	}
 
private:
	struct Star
	{
		float x, y, z;
	};
 
private:
	Star generateStar()
	{
		Star s = {(::rand() / (static_cast<double>(RAND_MAX) + 1.0)) * 20-10,
				  (::rand() / (static_cast<double>(RAND_MAX) + 1.0)) * 20-10,
				  (::rand() / (static_cast<double>(RAND_MAX) + 1.0)) * 100};
		return s;
	}
 
	void initStarfield()
	{
		for(StarField::iterator it = starfield.begin();
			it != starfield.end();
			++it)
		{
			*it = generateStar();
		}
	}
 
	void updateStarfield()
	{
		for(StarField::iterator it = starfield.begin();
			it != starfield.end();
			++it)
		{
			--it->z;
 
			if(it->z <= 0)
			{
				*it = generateStar();
			}
		}
	}
 
	void drawStarfield()
	{
		int w = width();
		int hw = w >> 1;
		int h = height();
		int hh = h >> 1;
 
		for(StarField::iterator it = starfield.begin();
			it != starfield.end();
			++it)
		{
			int screenX = static_cast<int>((it->x / it->z) * w + hw);
			int screenY = static_cast<int>((it->y / it->z) * h + hh);
 
			// ignore out of view stars
			if(screenX < 0 || screenX > 319 || screenY < 0 || screenY > 199)
				continue;
 
			putpixel(screen, screenX, screenY, SDL_MapRGBA(screen->format,
				0xfe, 0xef, 0xcc, 0xff));
		}
	}
 
	// ripped off SDL doc
	void putpixel(SDL_Surface *surface, int x, int y, Uint32 pixel)
	{
		int bpp = surface->format->BytesPerPixel;
		/* Here p is the address to the pixel we want to set */
		Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * bpp;
 
		switch(bpp) {
		case 1:
			*p = pixel;
			break;
 
		case 2:
			*(Uint16 *)p = pixel;
			break;
 
		case 3:
			if(SDL_BYTEORDER == SDL_BIG_ENDIAN) {
				p[0] = (pixel >> 16) & 0xff;
				p[1] = (pixel >> 8) & 0xff;
				p[2] = pixel & 0xff;
			} else {
				p[0] = pixel & 0xff;
				p[1] = (pixel >> 8) & 0xff;
				p[2] = (pixel >> 16) & 0xff;
			}
			break;
 
		case 4:
			*(Uint32 *)p = pixel;
			break;
		}
	}
 
private slots:
	void onRefresh()
	{
		if(windowInitialized && screen)
		{
			SDL_LockSurface(screen);
				// Nettoyage de l'écran
				SDL_FillRect(screen, NULL, 0);
				// Dessin du starfield
				drawStarfield();
			SDL_UnlockSurface(screen);
 
			// Rafraîchissement...
			SDL_UpdateRect(screen, 0, 0, 0, 0);
 
			// Et enfin, mise à jour des positions des étoiles
			updateStarfield();
		}
	}
 
private:
	bool windowInitialized;
	SDL_Surface *screen;
 
	typedef std::vector<Star> StarField;
	StarField starfield;
	const int StarNumbers;
};
 
int main(int argc, char* argv[])
{
    QApplication app(argc, argv);
 
	SDLWidget *sdlw = new SDLWidget;
	sdlw->show();
 
	return app.exec();
} | 
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