improvement of some existing sprite functions

[Dr. Dri]

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PreviousBuffer = UseBuffer(NewBuffer)

UseBuffer seems to return a IDirectDrawSurface pointer
It would be more useful get the sprite number (or -1 for the screen)

for example:

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buffer = UseBuffer(mysprite)
;draw some sprites
UseBuffer(buffer)

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SpriteWidth SpriteHeight SpriteDepth SpriteOutput SaveSprite...

I wish i could use thoses functions with the screen, by giving '-1' for the sprite number

Last request:
Why can't the Sprite3D display on the current buffer ?
It's a bit limited this way, isn't it ?

Dri