Hi all, I've been playing with bytemaps (see the latest LuaMetaFun manual) and I have come across a problem when I create more than 15 bytemaps. This came about as part of a bigger project where I create a large bytemap and then make smaller bytemaps with the data from the large bytemap. I've made a MWE below %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \startMPpage i := 1; for x = 1 upto 5: for y := 1 upto 5: newbytemap i of (250,250,3); setbytemap i to (floor(uniformdeviate(255) + 1),floor(uniformdeviate(255) + 1),floor(uniformdeviate(255) + 1)); fill unitsquare xyscaled (250,250) shifted ((x) * 255, (y) *255) withbytemap i; i := i + 1; endfor; endfor; \stopMPpage %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% The MWE above is for a 5 X 5 grid of randomly generated colours and you can see that the last 10m squares are black. Changing x or y to 3 will give 15 coloured squares, but a 4 X 4 grid and above gives black squares above 15 coloured squares. I can't see anything wrong with the code so I'm wondering if it is a bug. Any advice would be gratefully received. I'm running the latest update on a mac mini M1. Thanks Best Wishes Keith
On 5/11/2025 6:07 PM, Keith McKay wrote:
Hi all,
I've been playing with bytemaps (see the latest LuaMetaFun manual) and I have come across a problem when I create more than 15 bytemaps. This came about as part of a bigger project where I create a large bytemap and then make smaller bytemaps with the data from the large bytemap. I've made a MWE below
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \startMPpage i := 1; for x = 1 upto 5: for y := 1 upto 5: newbytemap i of (250,250,3); setbytemap i to (floor(uniformdeviate(255) + 1),floor(uniformdeviate(255) + 1),floor(uniformdeviate(255) + 1)); fill unitsquare xyscaled (250,250) shifted ((x) * 255, (y) *255) withbytemap i; i := i + 1; endfor; endfor; \stopMPpage %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
The MWE above is for a 5 X 5 grid of randomly generated colours and you can see that the last 10m squares are black. Changing x or y to 3 will give 15 coloured squares, but a 4 X 4 grid and above gives black squares above 15 coloured squares. I can't see anything wrong with the code so I'm wondering if it is a bug. Any advice would be gratefully received. I'm running the latest update on a mac mini M1.
Ah, we have a buglet here. It started out as max 16 bytemaps but then I bumped to (max) 1024 but forgot to replace some range tests. You can test the new bin from the compile farm. Thanks for keeping me on the edge. Do we need more than 1024? I guess not. Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl -----------------------------------------------------------------
Thanks Hans!
I can see that bytemaps are going to be very useful. As for needing more
than 1024...
Thanks again.
Best Wishes
On Sun, 11 May 2025, 19:11 Hans Hagen,
On 5/11/2025 6:07 PM, Keith McKay wrote:
Hi all,
I've been playing with bytemaps (see the latest LuaMetaFun manual) and I have come across a problem when I create more than 15 bytemaps. This came about as part of a bigger project where I create a large bytemap and then make smaller bytemaps with the data from the large bytemap. I've made a MWE below
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \startMPpage i := 1; for x = 1 upto 5: for y := 1 upto 5: newbytemap i of (250,250,3); setbytemap i to (floor(uniformdeviate(255) + 1),floor(uniformdeviate(255) + 1),floor(uniformdeviate(255) + 1)); fill unitsquare xyscaled (250,250) shifted ((x) * 255, (y) *255) withbytemap i; i := i + 1; endfor; endfor; \stopMPpage %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
The MWE above is for a 5 X 5 grid of randomly generated colours and you can see that the last 10m squares are black. Changing x or y to 3 will give 15 coloured squares, but a 4 X 4 grid and above gives black squares above 15 coloured squares. I can't see anything wrong with the code so I'm wondering if it is a bug. Any advice would be gratefully received. I'm running the latest update on a mac mini M1.
Ah, we have a buglet here. It started out as max 16 bytemaps but then I bumped to (max) 1024 but forgot to replace some range tests. You can test the new bin from the compile farm.
Thanks for keeping me on the edge. Do we need more than 1024? I guess not.
Hans
----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl -----------------------------------------------------------------
participants (2)
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Hans Hagen -
Keith McKay