Porting DirectDraw to SDL
Author
Hello, all. A few years ago I wrote a game using this tutorial
http://www.gamedev.net/reference/articles/article608.asp
Of course, it's been a few years and now Mac OS X is my favourite platform, not Windows. I would like to port my code to SDL, so that I could port it to Mac OS X. Has anybody attempted this? Is there a tutorial anywhere on converting DirectDraw code to SDL? Thank you for any pointers.
Here's a quick and dirty tutorial I whipped up based on the snippets of code I saw as I browsed through.
Initing: Call SDL_Init. That's all.
Create primary surface: Call SDL_SetVideoMode. That's all.
Loading a bitmap: IMG_Load if using the SDL_img library (recommended)
Palettes: I've never used palettes since the 486 days... dunno
Color keying: SDL_SetColorKey on a surface.
Blitting: SDL_BlitSurface
Page flipping: SDL_UpdateRect
Cleaning up: SDL_Quit
That's should serve as a useful starting point for browsing the SDL docs.
Initing: Call SDL_Init. That's all.
Create primary surface: Call SDL_SetVideoMode. That's all.
Loading a bitmap: IMG_Load if using the SDL_img library (recommended)
Palettes: I've never used palettes since the 486 days... dunno
Color keying: SDL_SetColorKey on a surface.
Blitting: SDL_BlitSurface
Page flipping: SDL_UpdateRect
Cleaning up: SDL_Quit
That's should serve as a useful starting point for browsing the SDL docs.
Author
Hi! Thanks bunches for that reply, it really is very helpful!
If i paste some of my code here, would you mind telling me what the equivalent SDL functions are? I would greatly appreciate it.
Thanks!
Jiro-
If i paste some of my code here, would you mind telling me what the equivalent SDL functions are? I would greatly appreciate it.
Thanks!
Jiro-
Quote:Original post by C-Junkie
Page flipping: SDL_UpdateRect
Use SDL_Flip(). If the surface isn't double buffered it will call SDL_UpdateRect().
Author
Here is a section of my code if you want to help...It was written almost 5 years ago so yes it looks like junk...
I would really like to find a way to do it in SDL... :(
I would really like to find a way to do it in SDL... :(
IDirectDrawSurface7 * CSprite::_pMakeSpriteSurface(){ IDirectDrawSurface7 * pdds4; HDC hDC; WORD * wp; m_bOnCriticalSection = TRUE; if( m_stBrush == NULL ) return NULL; CMyDib mydib(m_cPakFileName, m_dwBitmapFileStartLoc); m_wBitmapSizeX = mydib.m_wWidthX; m_wBitmapSizeY = mydib.m_wWidthY; pdds4 = m_pDDraw->pCreateOffScreenSurface(m_wBitmapSizeX, m_wBitmapSizeY); if (pdds4 == NULL) return NULL; pdds4->GetDC(&hDC); mydib.PaintImage(hDC); pdds4->ReleaseDC(hDC); DDSURFACEDESC2 ddsd; ddsd.dwSize = 124; if (pdds4->Lock(NULL, &ddsd, DDLOCK_WAIT, NULL) != DD_OK) return NULL; pdds4->Unlock(NULL); wp = (WORD *)ddsd.lpSurface; m_wColorKey = *wp; m_bOnCriticalSection = FALSE; return pdds4;}void CSprite::PutSpriteFast(int sX, int sY, int sFrame, DWORD dwTime, int iInPvX, int iInPvY){ short dX,dY,sx,sy,szx,szy,pvx,pvy; RECT rcRect; if( this == NULL ) return; if( m_stBrush == NULL ) return; if ((m_iTotalFrame-1 < sFrame) || (sFrame < 0)) return; m_bOnCriticalSection = TRUE; sx = m_stBrush[sFrame].sx; sy = m_stBrush[sFrame].sy; szx = m_stBrush[sFrame].szx; szy = m_stBrush[sFrame].szy; pvx = m_stBrush[sFrame].pvx + iInPvX; pvy = m_stBrush[sFrame].pvy + iInPvY; dX = sX + pvx; // if(bIsGate) // dY = sY + pvy -32;// else dY = sY + pvy; if (dX < m_pDDraw->m_rcClipArea.left) { sx = sx + (m_pDDraw->m_rcClipArea.left - dX); szx = szx - (m_pDDraw->m_rcClipArea.left - dX); if (szx <= 0) { m_rcBound.top = -1; return; } dX = (short)m_pDDraw->m_rcClipArea.left; } else if (dX+szx > m_pDDraw->m_rcClipArea.right) { szx = szx - ((dX+szx) - (short)m_pDDraw->m_rcClipArea.right); if (szx <= 0) { m_rcBound.top = -1; return; } } if (dY < m_pDDraw->m_rcClipArea.top) { sy = sy + (m_pDDraw->m_rcClipArea.top - dY); szy = szy - (m_pDDraw->m_rcClipArea.top - dY); if (szy <= 0) { m_rcBound.top = -1; return; } dY = (short)m_pDDraw->m_rcClipArea.top; } else if (dY+szy > m_pDDraw->m_rcClipArea.bottom) { szy = szy - ((dY+szy) - (short)m_pDDraw->m_rcClipArea.bottom); if (szy <= 0) { m_rcBound.top = -1; return; } } m_dwRefTime = dwTime; if (m_bIsSurfaceEmpty == TRUE) { if( _iOpenSprite() == FALSE ) return; } else { if (m_bAlphaEffect && (m_cAlphaDegree != G_cSpriteAlphaDegree)) { if (G_cSpriteAlphaDegree == 2) { _SetAlphaDegree(); } else { _iCloseSprite(); if( _iOpenSprite() == FALSE ) return; } } } rcRect.left = sx; rcRect.top = sy; rcRect.right = sx + szx; rcRect.bottom = sy + szy; m_rcBound.left = dX; m_rcBound.top = dY; m_rcBound.right = dX + szx; m_rcBound.bottom = dY + szy; m_pDDraw->m_lpBackB4->BltFast( dX, dY, m_lpSurface, &rcRect, DDBLTFAST_SRCCOLORKEY | DDBLTFAST_WAIT ); m_bOnCriticalSection = FALSE;}Quote:Original post by Jiroh
Here is a section of my code if you want to help...It was written almost 5 years ago so yes it looks like junk...
I would really like to find a way to do it in SDL... :(
Here's Some new code for Making a Surface in SDL
(replaces IDirectDrawSurface7 * CSprite::_pMakeSpriteSurface() )
// Load in an image and convert it to the display format// for faster blitting.SDL_Surface * Image_Load(char *file){ SDL_Surface *temp1, *temp2; temp1 = IMG_Load(file); temp2 = SDL_DisplayFormat(temp1); SDL_FreeSurface(temp1); return temp2;}(This next function replaces PutSpriteFast() )
// Blit an image on the screen surfacevoid Draw_IMG(SDL_Surface *img, int x, int y){ SDL_Rect dest; dest.x = x; dest.y = y; dest.h = img->h; dest.w = img->w; SDL_BlitSurface(img,//the image to blit NULL, //portion to blit - NULL blits entire imeage screen, //surface create from SDL_SetVideoMode &dest);// where the image will end up on screen}Its a lot less code with SDL than DD7.
Did I understand your code correctly, one loads an image and the other draws it, right?
Author
Hi Wyrzy, thanks for the tip! I'll study it tonight! You understood my code correctly. indeed. ^-^
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