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by dave j
Sat Sep 05, 2015 11:51 am
Forum: Graphics programming
Topic: Curvature/CRT-simulation on A+, possible?
Replies: 3
Views: 1958

Re: Curvature/CRT-simulation on A+, possible?

Sorry for bumping my own thread, but I would really really like to know if this is possible? Yes it's possible. The HLSL shaders you've seen do a lot more than just barrel distortion and whilst the Pi might have problems implementing the full range of effects it should be easily able to do the barr...
by dave j
Wed Sep 02, 2015 11:35 am
Forum: RISCOS
Topic: RISC OS Software Development
Replies: 17
Views: 6839

Re: RISC OS Software Development

What does it take to win for British computing? What does it take to win? It needs people to stop being insular and backward looking. BBC Basic was great in 1982 on the BBC Micro and had some useful improvements on the Archimedes but times have moved on. The first thing I did when I got my Archimed...
by dave j
Wed Sep 02, 2015 11:09 am
Forum: General discussion
Topic: Curvature tweek possible?
Replies: 9
Views: 2238

Re: Curvature tweek possible?

Yes, that is exactly what I want. But is this possible on the Pi? The screen curvature simulation should be easily doable. It's just drawing a texture onto a distorted rectangular grid. The page marked linked to has a link to a presentation which goes into more detail and the HLSL shader code for a...
by dave j
Sun Jun 28, 2015 6:54 pm
Forum: Off topic discussion
Topic: Intel Analog clone of pi
Replies: 15
Views: 1742

Re: Intel Analog clone of pi

P.S. I clicked the Amazon (Amazon UK) link you gave for the Gallileo. It said this item can't be delivered to the US. No big deal, but I'm curious as to why this is. Any ideas? Note, BTW, that I have ordered stuff from Amazon UK before; not electronics, but it has never been any problem. About a mo...
by dave j
Sat May 30, 2015 2:46 pm
Forum: General discussion
Topic: Running x86 apps on ARM
Replies: 92
Views: 118867

Re: Running x86 apps on ARM

@pUnK If you do work for Eltechs, and as you have only posted on this forum about their technology it's very likely you do, you ought to put something to that effect in your sig. What you're doing looks like astroturfing and people are naturally distrustful of companies who use such deceptive market...
by dave j
Tue May 19, 2015 5:05 pm
Forum: Off topic discussion
Topic: Image Identify
Replies: 9
Views: 2130

Re: Image Identify

How about towerwall.GIF /0agoor6ylxmyj calls it "tower" - but which tower - Eiffel? Blackpool? Has it got it right? Can you get it right? (hint - it was dismantled in 1919, and the base burned down April 1969. The fire engines attending that emptied the boating pool, which had just been filled in p...
by dave j
Wed Apr 22, 2015 7:27 pm
Forum: General discussion
Topic: License questions - Usage of available code (open source)
Replies: 14
Views: 1837

Re: License questions - Usage of available code (open source

The point I'm trying to get across is that GPL is virtually unenforceable. It wasn't created with a World view (it's based on US law) and it isn't clearly defined what constitutes a "derivative work". Therefore outside of the United States we can all mostly ignore it. Not true. Most of the GPL rela...
by dave j
Wed Apr 22, 2015 12:17 pm
Forum: Off topic discussion
Topic: Some Obfuscated C code
Replies: 14
Views: 1509

Re: Some odd C code

Searching for part of one of the strings reveals it was an entry to the International Obfuscated C Code Contest for 1988 ( look for phillipps on this link ). Posting a link to the code on that site (or mentioning the URL you'd got it from) would have allayed people's fears about what it might do. If...
by dave j
Wed Apr 08, 2015 6:23 pm
Forum: Off topic discussion
Topic: Codes that Changed the World - BBC Radio 4 - UK
Replies: 5
Views: 1234

Re: Codes that Changed the World - BBC Radio 4 - UK

There was a familiar voice on today's programme about Basic. ;)

dave j
by dave j
Sat Mar 21, 2015 6:54 pm
Forum: Off topic discussion
Topic: Future 3D Printed RPi board?
Replies: 104
Views: 9989

Re: Future 3D Printed RPi board?

mikerr wrote: "30 ohm-cm" when printed

Well that's much better than the last "conductive" filament I tried which was around 1 Mega ohm per cm (i.e. near useless!)
You can apparently make your own ink cheaply that is around 0.3 ohm per cm. Youtube link: Homemade copper conductive paint / ink
by dave j
Tue Mar 10, 2015 8:46 pm
Forum: Graphics programming
Topic: Real time gauge
Replies: 10
Views: 10150

Re: Real time gauge

Someone was doing something very similar in the Drawing lines with anti-aliasing? thread.
by dave j
Sun Mar 08, 2015 7:57 pm
Forum: Bare metal, Assembly language
Topic: BCM 2836 and the RPi 2 ?
Replies: 95
Views: 30191

Re: BCM 2836 and the RPi 2 ?

I heard the claim that Java is as fast or faster than C and yet I cannot understand how that is possible. Given C's reputation as a high level 'assembler', and the considerable amount of work that has been done on optimisations, how can Java be faster? I can see where similar code MIGHT be able to ...
by dave j
Tue Mar 03, 2015 8:13 pm
Forum: Graphics programming
Topic: Plans to support Vulkan?
Replies: 10
Views: 8422

Re: Plans to support Vulkan?

Anyone knowledgeable want to comment on the odds that Broadcom or the Foundation will get Vulkan running on the BCM2836? These things usually work the other way round. The Vulkan developers get their stuff running on the RPi because they see it as a desirable platform for their software rather than...
by dave j
Tue Mar 03, 2015 5:15 pm
Forum: Graphics programming
Topic: Plans to support Vulkan?
Replies: 10
Views: 8422

Re: Plans to support Vulkan?

ajstarks wrote:Are there plans to support the new graphics API, Vulkan?
See: https://www.khronos.org/vulkan
From the page you linked to:
Will work on any platform that supports OpenGL ES 3.1 and up
So it looks unlikely.
by dave j
Tue Feb 17, 2015 10:25 pm
Forum: Graphics programming
Topic: Poor graphics / Banding issues
Replies: 9
Views: 7437

Re: Poor graphics / Banding issues

A bit of thread necromancy but... I've found a temporary solution for colour banding issues in Qt5. It looks like Qt5 isn't detecting/configuring the frame buffer's colour depth for OpenGL ES, it looks like it's just using 16 bit, but there is a way to force it to 24 bit. According to this page you ...
by dave j
Thu Jan 22, 2015 11:34 am
Forum: Off topic discussion
Topic: Little perks that make you smile
Replies: 28
Views: 4029

Re: Little perks that make you smile

I noticed VLC player's icon had changed to a red Santa Claus style hat over the festive period! Just a noveltysomeone programmed in I guess. Made me chuckle anyway (I'm easily entertained!) All the characters in SuperTuxKart had Santa hats on over xmas and the new year. A word processor I used on t...
by dave j
Thu Jan 22, 2015 11:28 am
Forum: Graphics programming
Topic: Drawing lines with anti-aliasing?
Replies: 3
Views: 3947

Re: Drawing lines with anti-aliasing?

For the needle, you can get an anti-aliased line using aaline rather than line. (The parameters are different so it's not just a case of changing line to aaline.) You might be able to do something for the scale marks with pygame.gfxdraw.aatrigon (two triangles can make a rectangle) but the documenta...
by dave j
Sat Dec 13, 2014 6:13 pm
Forum: General discussion
Topic: Can the Pi act as a print server for HP Laserjet CP1215
Replies: 36
Views: 9681

Re: Can the Pi act as a print server for HP Laserjet CP1215

I am not an expert on the Pi, but I've been chasing this printer for a different reason. See this posting on the driver that is required: http://hplipopensource.com/hplip-web/models/color_laserjet/hp_color_laserjet_cp1215.html HP Printers are just as easy as installing hplip from the Raspbian Wheez...
by dave j
Wed Dec 03, 2014 4:01 pm
Forum: General discussion
Topic: Rpi as a SCSI hard drive?
Replies: 25
Views: 7348

Re: Rpi as a SCSI hard drive?

Linux supports the Amiga filesystem . Could you possibly plug the drive into a PC and copy the data from there? I looked into adding a SCSI interface via GPIO. Whilst the B+ has enough pins for an 8 bit interface and the Linux SCSI subsystem's layering would make writing the software relatively easy...
by dave j
Wed Nov 19, 2014 8:32 pm
Forum: Off topic discussion
Topic: Intel leaving mobile?
Replies: 6
Views: 1670

Re: Intel leaving mobile?

At the very least it sounds like they are trying to hide their losses in the mobile group by merging them with their PC one.

What we need now is a load of 64 bit ARM chips (desktop as well as server ones).
by dave j
Sat Oct 11, 2014 2:56 pm
Forum: Off topic discussion
Topic: get_iplayer Only 7 day library
Replies: 2
Views: 842

Re: get_iplayer Only 7 day library

URLs for iPlayer on the Beeb website are similar to: http://www.bbc.co.uk/iplayer/episode/b03p7p6v/jimi-hendrix-the-road-to-woodstock The b03p7p6v part in the example above is the programme id and you can use that with get_iplayer to download the programme. e.g. For the above programme you could use...
by dave j
Sun Oct 05, 2014 4:12 pm
Forum: General discussion
Topic: get_iplayer Wrong Download
Replies: 5
Views: 875

Re: get_iplayer Wrong Download

I've found get_iplayer with the --get option unreliable for the reasons jm3220 said. The most reliable way to avoid those problems is to download using program ids which, unlike index numbers, don't change.

David
by dave j
Thu Oct 02, 2014 8:56 pm
Forum: Off topic discussion
Topic: YOU SUCK: the venting thread
Replies: 948
Views: 157225

Re: YOU SUCK: the venting thread

Hate wonga's ridiculous interest rates of course, but now they are wiping out people's debt if its over 30 days in arrears :shock: Sends totally wrong message IMO I suspect the people who are having their debt wiped out have paid off the amount they originally borrowed many times over and are actua...
by dave j
Tue Sep 30, 2014 1:24 pm
Forum: OpenGLES
Topic: RPi 3D triangles per second?
Replies: 13
Views: 9366

Re: RPi 3D triangles per second?

I don't think anyone will be able to give you any numbers because, as your post says, it's a very broad question with many "it depends". I doubt Roy's tests provide a good measure of real world performance - they use very small batch sizes which kills performance. The Pi's GPU, like most other mobil...
by dave j
Sat Feb 15, 2014 4:31 pm
Forum: General discussion
Topic: Programming Ideas Needed!!!
Replies: 6
Views: 969

Re: Programming Ideas Needed!!!

As others have mentioned games, those from the 8 bit era provide a good source of ideas for things to produce. They are relatively simple and there's lots of variety - probably more so than current games as genres weren't so prevalent then.

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