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DirectDraw Clipping

Started by cb007sax Apr 14, 2002 at 7:20 PM 6 replies 350+ views

Original Post

Apr 14, 2002 at 7:20 PM

Is there a way i can, in full screen mode, draw outside the screen, like in negative coordinates. Im doing an isometric map and i want to draw outside the screen so when i scroll it wont have blank spots. i know theres some clipper for direct draw but i thought it was only for windowed mode, im in full screen. what can i do?

cb007sax

Apr 15, 2002 at 1:24 AM

so sad

Useless Hacker

Apr 15, 2002 at 8:00 AM

Yes, you are.

The answer to your question is no. What are you doing to scroll the screen anyway?

Quantum

Apr 15, 2002 at 8:20 AM

You can use a clipper and just attach it to the whole window and it''ll do what you want.

  
LPDIRECTDRAWCLIPPER pDDClipper;
DirectDraw->CreateClipper(NULL, &pDDClipper, NULL);
pDDClipper->SetHWnd(NULL, hWnd);
DDSBack->SetClipper(pDDClipper);

Jason Zelos

Apr 15, 2002 at 2:57 PM

You can also write all your tiles to a surface then blit a portion of that surface to the screen, you do not need to worry about clipping then. My engine(s) use this method to get around the tile offset problem.


for TileX = 0 to ScreenWidthInTiles+1
    for TileY = 0 to ScreenHeightInTiles+1
        TempSurface.Blit(TileX, TileY, TileSize, TileList[CurrentTileX+TileX][CurrentTileY+TileY])

and to blit to the backbuffer


BackBuffer.Blit(OffsetX, OffsetY, BackBufferSize, TempSurface)

Offset x and y are the view offsets from CurrentTileX and Y. Of course this p-code has no bounds checking.

If you use fine coords use :


CurrentTile  = Position (int div) \ TileSize
Offset = Position modulus TileSize

,Jay

Big Sassy

Apr 15, 2002 at 5:45 PM

Yes, DirectDraw has a clipper for full-screen mode. Look at the documentation that comes with the SDK.

cb007sax

Apr 15, 2002 at 7:30 PM

thanks guys trying out yoru solutions,

i''ll tell u if they work

cb007sax

Apr 15, 2002 at 7:36 PM

dd->CreateClipper(NULL, &pDDClipper, NULL);
pDDClipper->SetHWnd(NULL, Window);
backbuf->SetClipper(pDDClipper);

with that code i get blit errors, the clipper won''t work. ?? whats wrong

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