Off-screen Rendering Followup

[pixel...@gmail.com]

Hello All,

Yesterday we talked about using offscreen rendering to speed up my game project.
I thought it would be a matter of just creating a bitmap as a buffer and then blitting that bitmap to the display stream of the window once per update.

I've noticed the graphics operations like DRAWLINE and friends want a display stream rather than a bitmap. I've seen examples of manually editing bitmaps in the bitmap editor tool but I want to procedural generate the shapes and such onto my bitmap in game when the window changes size and the buttons therefore need to change size as well.

So, do I need to actually implement my own drawing routines from scratch for BITMAP types (DRAWLINE, DRAWPOLYGON etc)?

Or did I misunderstand the notion of drawing offscreen then updating my game window?

PS: Tomorrow is one of the Wednesday meetings I'll have to miss due to an existing biweekly Wednesday appointment I have.

Thanks for the insight!
- Ryan Burnside

[Nick Briggs]

Hi Ryan --

You can (DSPCREATE <yourbitmap>) to wrap a display stream around it, and use the result of that for your drawing, and then BITBLT the bitmap that you drew into to wherever you need it.

-- Nick

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[pixel...@gmail.com]

Excellent - Thanks Nick.

I'll give that a try tomorrow.

At some point it might be good to tuck that kind of thing in a "cookbook" for common Medley idioms.

[pixel...@gmail.com]

It's looking pretty good, this will work - thanks!