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Pixel Plotting

Started by oooaah Jun 10, 2002 at 2:45 PM 2 replies 400+ views

Original Post

Jun 10, 2002 at 2:45 PM

After a bit of reading around I found that the lock/unlock mechanism allows pixel plotting to the screen. Hooray! A faster method than GDI''s SetPixel(). But then a lot of the articles I read said this method could be very slow. Is there any other method faster than this for pixel plotting with DirectX? An example of what I want to use a pixel plotter for is a ''rain effect'' in a game. Is lock/unlock suitable for this?

Mark Tanner

Jun 10, 2002 at 2:56 PM

It will be fast enough as long as you don't lock and unlock between each individual pixel. Don't write a pixelplot function that locks and unlocks. Write one that assumes the surface is already locked, its pretty simple and it will be fast.

Mark

[edited by - Mark Tanner on June 10, 2002 3:56:37 PM]

CrazedGenius

Jun 10, 2002 at 3:30 PM

for rain, you might do better with small lines and/or very thin polygons (assuming you are using D3D). This would be much faster than plotting pixels, you''d get movement, depth testing for "free", etc. etc.

oooaah

Author

oooaah

Jun 10, 2002 at 4:38 PM

Cheers fo the help guys. I have been using DirectDraw but was thinking about switching to D3D anyway as you can do far more with it.

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