implementing multiple layers in gfx software

fishyfish · 17 October 2010, 10:52

I have no particular language in mind as yet, but what's the theory behind doing some sort of layers in a paint/pxiel type program? My idea so far is to simply give a screen to each layer and have the physical screen a mixture of its combined layers. Drawing on any layer would actually be writing to its screen. All good in theory, but a little RAM intensive.
Can any offer any input as to why this method is good/bad/other, or suggest alternative methods if there's better ways to go about it.
Thanks in advance

p.s. Im thinking in regards to ocs/ecs/aga by the way.

thomas · 17 October 2010, 12:37

You should use only one screen for the display and for the layers only use bitmaps. With patches like FBlit you can keep the bitmaps in FastRAM. But yes, it is memory hungry. And CPU intensive. You need to combine all layers into the the display for every drawing operation.

17 October 2010, 10:52	#1
fishyfish Banned Join Date: Jul 2010 Location: Australia Posts: 475	implementing multiple layers in gfx software I have no particular language in mind as yet, but what's the theory behind doing some sort of layers in a paint/pxiel type program? My idea so far is to simply give a screen to each layer and have the physical screen a mixture of its combined layers. Drawing on any layer would actually be writing to its screen. All good in theory, but a little RAM intensive. Can any offer any input as to why this method is good/bad/other, or suggest alternative methods if there's better ways to go about it. Thanks in advance p.s. Im thinking in regards to ocs/ecs/aga by the way.

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17 October 2010, 12:37	#2
thomas Registered User Join Date: Jan 2002 Location: Germany Posts: 7,026	You should use only one screen for the display and for the layers only use bitmaps. With patches like FBlit you can keep the bitmaps in FastRAM. But yes, it is memory hungry. And CPU intensive. You need to combine all layers into the the display for every drawing operation.

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