Keskustelu: Koodit: C++: Lumisade-efekti

#include <windows.h>
#include <ddraw.h>
#include <mmsystem.h>


HWND hWnd;
LPDIRECTDRAW lpDD;
LPDIRECTDRAWSURFACE surf;
DDSURFACEDESC ddsd;
unsigned int *dBuffer;

#define WIDTH 320
#define HEIGHT 240
#define MAX 320*240

inline static void* __cdecl ALLOC(unsigned int cb)
{
	return HeapAlloc(GetProcessHeap(),0,cb);
}

inline unsigned int fastrand()
{
	static int seed=0xcafebabe;
	return (unsigned)(seed=seed*0x97654321+1)>>17;
}
inline unsigned int rgb(short r, short g, short b)
{
	return ((r<<16)+(g<<8)+b);
}


//kääntäjän juttuja
#if defined(__cplusplus)
    extern "C" {
#endif

	extern const int _fltused = 1;

#if defined(__cplusplus)
	}
#endif

void mainCRTStartup()
{
	hWnd = CreateWindowEx(WS_EX_TOPMOST, "STATIC",
                             0,
                             WS_POPUP | WS_VISIBLE,
                             0, 0,
                             WIDTH, HEIGHT,
                             0, 0, 0, 0);
	ShowCursor(FALSE);
	ShowWindow(hWnd,SW_SHOW);
	DirectDrawCreate(NULL,&lpDD,NULL);
	lpDD->SetCooperativeLevel(hWnd,DDSCL_EXCLUSIVE|DDSCL_FULLSCREEN);
	lpDD->SetDisplayMode(WIDTH,HEIGHT,32);
	ddsd.dwSize=sizeof(ddsd);
	ddsd.dwFlags = DDSD_CAPS | DDSD_BACKBUFFERCOUNT;
	ddsd.dwBackBufferCount = 1;
	ddsd.ddsCaps.dwCaps = DDSCAPS_FLIP | DDSCAPS_COMPLEX | DDSCAPS_VIDEOMEMORY | DDSCAPS_PRIMARYSURFACE;
	lpDD->CreateSurface(&ddsd,&surf,NULL);
	dBuffer=(unsigned int*)ALLOC(320*240*4);

	bool done=false;

	while(!done)
	{

		static float kak;
		kak+=0.10f;
		for(int c=0;c<MAX;c++)
		{
			int ja=fastrand()%255;
			dBuffer[c]=rgb(ja,ja,ja);
		}


		surf->Lock(NULL, &ddsd, DDLOCK_WAIT, NULL);

		int w=ddsd.dwWidth;
		int h=ddsd.dwHeight;
		int bpl=ddsd.lPitch;
		int bpp=32;
		char *dest = (char *) ddsd.lpSurface;
		char *src = (char *)dBuffer;
		_asm
		{
			mov edi,dest
			mov esi,src

			mov eax,w
			shl eax,2
			mov ebx,bpl
			sub ebx,eax
			mov eax,w
			mov ecx,h
        looppi:
			mov edx,ecx
			mov ecx,eax
			rep movsd
			add edi,ebx

		    mov ecx,edx
	        loop looppi
		}
		surf->Unlock(NULL);
		if(GetAsyncKeyState(VK_ESCAPE) & 0x8000)
		{
			done=true;
		}
	}
	DestroyWindow(hWnd);
}