Scrolling tiles question

Zorbfish · 2002-05-29T15:09:00

#define WIN32_LEAN_AND_MEAN #define WORLDX 40 #define WORLDY 40 #include <stdio.h> #include <windows.h> #include <windowsx.h> #include <ddraw.h> LPDIRECTDRAW lpDD=NULL; LPDIRECTDRAWSURFACE lpPrimary=NULL; LPDIRECTDRAWSURFACE lpBackBuffer=NULL; LPDIRECTDRAWSURFACE lpSecondary=NULL; LPDIRECTDRAWCLIPPER lpClipper=NULL; HINSTANCE hInstance; RECT src,dest; DDBLTFX ddbltfx; HDC hdc; RECT Tiles[]={ {0,0,32,32}, {32,0,64,32}, {64,0,96,32} }; int x=0,y=0,start_x,start_y,end_x,end_y,camerax,cameray; int map[WORLDX][WORLDY] = { {2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1,2, 1, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,1, 1, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,2, 1, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2,1, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,1, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}}; long CALLBACK WindowProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam); BOOL DirectDraw(HWND hwnd){ if(FAILED(DirectDrawCreate(NULL,&lpDD,NULL))) return FALSE; if(FAILED(lpDD->SetCooperativeLevel(hwnd,DDSCL_ALLOWREBOOT|DDSCL_EXCLUSIVE|DDSCL_FULLSCREEN))) return FALSE; if(FAILED(lpDD->SetDisplayMode(640,480,32))) return FALSE; DDSURFACEDESC ddsd; ddsd.dwSize=sizeof(DDSURFACEDESC); ddsd.dwFlags=DDSD_CAPS|DDSD_BACKBUFFERCOUNT; ddsd.ddsCaps.dwCaps=DDSCAPS_COMPLEX|DDSCAPS_FLIP|DDSCAPS_PRIMARYSURFACE; ddsd.dwBackBufferCount=1; if(FAILED(lpDD->CreateSurface(&ddsd,&lpPrimary,NULL))) return FALSE; ddsd.ddsCaps.dwCaps=DDSCAPS_BACKBUFFER; if(FAILED(lpPrimary->GetAttachedSurface(&ddsd.ddsCaps,&lpBackBuffer))) return FALSE; ddsd.dwFlags=DDSD_CAPS|DDSD_HEIGHT|DDSD_WIDTH|DDSD_CKSRCBLT; ddsd.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN; ddsd.dwHeight=32; ddsd.dwWidth=96; ddsd.ddckCKSrcBlt.dwColorSpaceLowValue=RGB(255,255,255); ddsd.ddckCKSrcBlt.dwColorSpaceHighValue=RGB(255,255,255); if(FAILED(lpDD->CreateSurface(&ddsd,&lpSecondary,NULL))) return FALSE; if(FAILED(lpDD->CreateClipper(NULL,&lpClipper,NULL))) return FALSE; LPRGNDATA lpClipList = (LPRGNDATA)malloc(sizeof(RGNDATAHEADER) + sizeof(RECT)); RECT rcBoundary = {0, 0, 640, 480}; memcpy(lpClipList->Buffer, &rcBoundary, sizeof(RECT)); lpClipList->rdh.dwSize = sizeof(RGNDATAHEADER); lpClipList->rdh.iType = RDH_RECTANGLES; lpClipList->rdh.nCount = 1; lpClipList->rdh.nRgnSize = sizeof(RECT); lpClipList->rdh.rcBound = rcBoundary; if (FAILED(lpClipper->SetClipList(lpClipList, 0))) { free(lpClipList); return(FALSE); } if (FAILED(lpBackBuffer->SetClipper(lpClipper))) { free(lpClipList); return(FALSE); } free(lpClipList); return TRUE; } bool LoadImage(LPDIRECTDRAWSURFACE lpDDS, LPSTR szImage){ HBITMAP hbm; HDC hdcImage=NULL,hdcSurf=NULL; DDSURFACEDESC ddsd; ZeroMemory(&ddsd,sizeof(ddsd)); ddsd.dwSize = sizeof(ddsd); if(FAILED(lpDDS->GetSurfaceDesc(&ddsd))) return FALSE; hbm=(HBITMAP)LoadImage(NULL,szImage,IMAGE_BITMAP,ddsd.dwWidth,ddsd.dwHeight,LR_LOADFROMFILE|LR_CREATEDIBSECTION); if(hbm==NULL) return FALSE; hdcImage=CreateCompatibleDC(NULL); SelectObject(hdcImage,hbm); if(FAILED(lpDDS->GetDC(&hdcSurf))) return FALSE; if(BitBlt(hdcSurf,0,0,ddsd.dwWidth,ddsd.dwHeight,hdcImage,0,0,SRCCOPY)==FALSE) return FALSE; if(hdcSurf) lpDDS->ReleaseDC(hdcSurf); if(hdcImage) DeleteDC(hdcImage); if(hbm) DeleteObject(hbm); return TRUE; }; bool UpdateFrame(){ SetRect(&dest,0,0,32,32); start_x=camerax/32; end_x=start_x+20; start_y=cameray/32; end_y=start_y+15; if(camerax%32==0){ end_x--; } else{ dest.left-=x; dest.right-=x; } if(cameray%32==0){ end_y--; } else{ dest.top-=y; dest.bottom-=y; } for(int i=start_y;i<end_y;i++){ for(int j=start_x;j<end_x;j++){ int tile=map[i][j]; lpBackBuffer->Blt(&dest,lpSecondary,&Tiles[tile],DDBLT_WAIT,NULL); dest.left+=32;dest.right+=32; } dest.top+=32; dest.bottom+=32; dest.left=0;dest.right=32; } return TRUE; } int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nShowCmd){ MSG msg; HWND hwnd; WNDCLASS wc; wc.style= CS_HREDRAW|CS_VREDRAW; wc.hInstance=hInstance; wc.lpfnWndProc=WindowProc; wc.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH); wc.hCursor=LoadCursor(hInstance,IDC_ARROW); wc.hIcon=LoadIcon(hInstance,IDI_APPLICATION); wc.cbClsExtra=0; wc.cbWndExtra=0; wc.lpszClassName="Window"; wc.lpszMenuName=NULL; RegisterClass(&wc); hwnd=CreateWindowEx(WS_EX_TOPMOST,"Window","Test",WS_POPUP,0,0,GetSystemMetrics(SM_CXSCREEN),GetSystemMetrics(SM_CYSCREEN),NULL,NULL,hInstance,NULL); ShowWindow(hwnd,nShowCmd); UpdateWindow(hwnd); ShowCursor(FALSE); if(FAILED(DirectDraw(hwnd))) return FALSE; if(FAILED(LoadImage(lpSecondary,"grass.bmp"))) return FALSE;/* if(FAILED(LoadImage(lpHero,"sprite.bmp"))) return FALSE;*/ ddbltfx.dwSize=sizeof(DDBLTFX); ddbltfx.dwFillColor=0; int maxx=WORLDX; int maxy=WORLDY; int maxcamerax=(maxx-19)*32; int maxcameray=(maxy-15)*32; camerax=maxcamerax/2; cameray=maxcameray/2; while(TRUE){ DWORD dwStart=GetTickCount(); if (PeekMessage(&msg,NULL,0,0,PM_REMOVE)){ if(msg.message == WM_QUIT){ break; } TranslateMessage(&msg); DispatchMessage(&msg); } else{ UpdateFrame(); lpPrimary->Flip(NULL,DDFLIP_WAIT); while(GetTickCount()-dwStart<33); } }; return msg.wParam; }; long CALLBACK WindowProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam){ PAINTSTRUCT ps; switch(message){ case WM_ACTIVATEAPP: break; case WM_PAINT: BeginPaint(hwnd,&ps); EndPaint(hwnd,&ps); break; case WM_KEYDOWN: switch(wParam){ case VK_ESCAPE: DestroyWindow(hwnd); break; case VK_UP: cameray-=5; break; case VK_DOWN: cameray+=5; break; case VK_LEFT: camerax-=5; break; case VK_RIGHT: camerax+=5; break; }; break; case WM_DESTROY: if(lpDD!=NULL){ if(lpPrimary!=NULL){ if(lpBackBuffer!=NULL) lpBackBuffer->Release(); if(lpClipper!=NULL) lpClipper->Release(); if(lpSecondary!=NULL) lpSecondary->Release(); lpPrimary->Release(); }; lpDD->Release(); lpBackBuffer=NULL; lpClipper=NULL; lpSecondary=NULL; lpPrimary=NULL; lpDD=NULL; }; ShowCursor(TRUE); PostQuitMessage(0); break; default: break; }; return DefWindowProc(hwnd,message,wParam,lParam); }; OK, I''ve read the Game Programming Genesis tutorial many times and I understand the theory behind scrolling the screen. I tried simplifying the code (i.e. removing bitwise ops for now,and i/o) and unfortunately the code does not smooth scroll as it should. Can anyone provide some insight into what I''m doing wrong? Also I''ve tried to find an article on exactly what the difference is with the clipper syntax above... For instance isn''t it easier just to declare the clipper to the whole window? lpClipper->SetHwnd(NULL,hwnd) Or does the clip list play a more significant role I do not understand? Anyways thanks for reading and hopefully someone out here can help me out... Zorb

For Beginners

Started by Zorbfish May 27, 2002 01:32 PM

12 comments, last by Zorbfish 22 years, 7 months ago

Jason Zelos

211

May 28, 2002 03:29 PM

Go for that Jim Adams tut, its 1996 and fl**ping fantastic. (I used it with allegro-DOS)

If you wish a more in depth thingamy - post.

,Jay

Zorbfish

Author

214

May 29, 2002 02:16 PM

I finally found the problem... every tutorial I had read blitted tiles from top to bottom, then left to right. I always find the most difficult way of doing things and I was doing the blitting in the opposite way; from left to right then top to bottom. That''s why it wasn''t working

Now it works perfectly... Thanks to all who posted... I''ll be back in a few days with more Qs most likely

Zorb

Jason Zelos

211

May 29, 2002 02:30 PM

    UpdateFrame(){	start_x=camerax/32;	end_x=start_x+20;	start_y=cameray/32;	end_y=start_y+15;        x=camerax%32; //offset        y=camera%32;        if (x!=0) x=-32; else end_x--; //if offset not zero blit extra tile        if (y!=0) y=-32; else end_y--; // and start from offscreen (clipped)        SetRect(&dest,x,y,32+x,32+y); //first tile portion	for(int i=start_y;i<end_y;i++){		    for(int j=start_x;j<end_x;j++){			int tile=map[i][j];			                   lpBackBuffer->Blt(&dest,lpSecondary,&Tiles[tile],DDBLT_WAIT,NULL);			                  dest.left+=32;dest.right+=32;		        }		dest.top+=32;		dest.bottom+=32;		        dest.left=x;        dest.right=32+x;	        }	return TRUE;

This is the alteration to add offset calc (x,y), My previous posts demostrated using a large surface and just blitting a portion of it (a very quick method in some cases with out clipping), but a bit different to this method.

I lost some code off my previous posts (??).

,Jay

Edit: Missed a bit.

[edited by - Jason Zelos on May 29, 2002 4:09:00 PM]

Jason Zelos

211

May 29, 2002 02:35 PM

And after I''d written all that code

Incidently you are blitting top to bottom, left to right.
The screen is always 0,0 at the top left corner.

,Jay

Scrolling tiles question

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Scrolling tiles question

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