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Old 18 January 2020, 21:00   #1
sparhawk
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How man bitplances for a game

When I create a screen on PAL with 5 Bitmaps, it means that already 400kb of Chipmem are gone (320x256x5). Is this a realistic/usefull setup, or do games usually create smaller screens because of memory constraint. Considering that you also need some Chipmem for sounds, sprites, diskbuffers, etc. isn't this a bit tight with 512KB in total?
How do games usually deal with this? Only 4 bitplanes with only 16 colors, smaller sctreen?
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Old 18 January 2020, 21:09   #2
DanScott
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320 pixels wide = 40 bytes per plane...

so memory usage is 40 * 256 *5 = 51200 bytes
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Old 18 January 2020, 21:19   #3
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Ahh! That's of course quite a difference. Totally forgot that there is not one Byte per Pixel.
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Old 19 January 2020, 11:45   #4
Steril707
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Quote:
Originally Posted by sparhawk View Post
Ahh! That's of course quite a difference. Totally forgot that there is not one Byte per Pixel.
You chunky Mofo...

(btw, if you use 5 planes, check out if you have enough DMA time left for whatever you wanna build... )
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Old 19 January 2020, 16:11   #5
sparhawk
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I wanted to do a port of Choplifter. i figured that the game mechanics is rather simple, so it might be a good project to learn the basics, and develop all the functions that I need, like loading graphics, sounds etc..
I guess an experienced developer can probably write that game in two or three weeks at most. For me it's more a matter of months (or more), as I never did any graphics, and also have to learn how to do my own music.
I don't even know if I really need 5 bitplanes or not. I still do a lof experimenting at the moment.
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Old 19 January 2020, 16:19   #6
DanScott
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We actually acquired the official Choplifter license at Core Design in around 1991/1992, but the project got shelved at some point.
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Old 19 January 2020, 17:25   #7
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Some cool games as I can see.

I doubt that I will manage to create something up to those standards, but I'll try my best.
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Old 19 January 2020, 18:17   #8
commodorejohn
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Sounds fun
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Old 19 January 2020, 19:15   #9
malko
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"I hold your thumbs" and look forward to seeing here the progress of your project
(I did enjoy Choplifter in arcade hall BitD).
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Old 19 January 2020, 19:28   #10
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I was thinking of creating a project thread, once it is so far along, that I can actually show something, and it becomes clearer that I actually will do it. I have created enough projects where I lost interest in between, so I don't want to make to much noise and just create vapour.

In the meantime, the functions I write or find in various sources I collect here: https://github.com/skeetor/amiga-utils

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(I did enjoy Choplifter in arcade hall BitD).
I didn't even know that this was an arcade. I just knew the C64 version. Guess I have to check this out and see how it looks. Phew! That raises the bar quite a lot I guess.
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