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by lb
Sun Oct 28, 2012 5:54 pm
Forum: Graphics programming
Topic: Clever trick to salvage a deadline...?
Replies: 24
Views: 4327

Re: Clever trick to salvage a deadline...?

Pi3D should probably be rewritten in GLES2 for a start. That's a good opportunity to fix many of its issues as well.
by lb
Sun Oct 28, 2012 3:16 pm
Forum: Beginners
Topic: SD card speed?
Replies: 7
Views: 1918

Re: SD card speed?

The class ratings are meaningless for usage in the Pi. Where did you read that class 4 is required? That is not correct.
by lb
Mon Oct 22, 2012 7:32 pm
Forum: Graphics programming
Topic: Clever trick to salvage a deadline...?
Replies: 24
Views: 4327

Re: Clever trick to salvage a deadline...?

Pi3D certainly isn't perfect and has various warts. The biggest probably that it uses OpenGL ES 1.1. However, it still allows you to get something to the screen qucikly. See the BouncingBalls demo for an example of sprite animation.
by lb
Mon Oct 22, 2012 7:07 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Am I being stupid or is this possible?
Replies: 4
Views: 2051

Re: Am I being stupid or is this possible?

To make it short, there is no interface available on the Raspberry Pi that is suitable for attaching an external GPU or any other PCI/PCIe device. What would you need that for?
by lb
Mon Oct 22, 2012 12:45 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: SPI driver latency and a possible solution
Replies: 241
Views: 132910

Re: SPI driver latency and a possible solution

At the moment, the proper way to get your stuff included seems to be Github pull requests. Worked for me, at least. ;)
by lb
Sun Oct 21, 2012 4:10 pm
Forum: Graphics programming
Topic: Clever trick to salvage a deadline...?
Replies: 24
Views: 4327

Re: Clever trick to salvage a deadline...?

Well, that was a rather strange expression, yeah. I'm not a native speaker, but I don't know why I came up with it either.

Anyway, as long as it gets the point across, it's probably fine. :)
by lb
Sun Oct 21, 2012 2:01 pm
Forum: Graphics programming
Topic: Clever trick to salvage a deadline...?
Replies: 24
Views: 4327

Re: Clever trick to salvage a deadline...?

Pi3D only uses PIL to load textures. Rendering itself is fully hardware accelerated. Just check out some of the examples. It's really, really easy to do a bit of animation with it. I mandate against using OpenVG directly as it is a low-level API and you won't see results quickly.
by lb
Sun Oct 21, 2012 2:57 am
Forum: Graphics programming
Topic: Clever trick to salvage a deadline...?
Replies: 24
Views: 4327

Re: Clever trick to salvage a deadline...?

Use OpenGL ES. Have you checked out Pi3D? It should make it quite easy to do 2D sprite animations.
by lb
Sat Oct 20, 2012 6:41 pm
Forum: General discussion
Topic: Cat-induced damage...
Replies: 7
Views: 1610

Re: Cat-induced damage...

It's just a buffer capacitor and isn't absolutely necessary. If you have a stable power supply, the board should still work without any issues.
by lb
Fri Oct 19, 2012 11:25 pm
Forum: General discussion
Topic: Simon's accelerated X development thread
Replies: 405
Views: 132764

Re: Simon's accelerated X development thread

16 bit has horrible color banding, I'm glad the focus is on 24/32 bits. :)
by lb
Fri Oct 19, 2012 3:42 pm
Forum: Off topic discussion
Topic: Exactly where in China are R-Pi's made?
Replies: 7
Views: 1506

Re: Exactly where in China are R-Pi's made?

RaTTuS wrote: however there are reports of several RS shipments being the Made in UK ones.
Maybe RS bought some of Farnell's stock to help with clearing the huge backlog of boards? :)
by lb
Sun Oct 14, 2012 9:44 pm
Forum: C/C++
Topic: VP8 decoder
Replies: 4
Views: 2233

Re: VP8 decoder

AFAIR it's not exposed through OpenMAX IL, at least.
by lb
Sun Oct 14, 2012 7:47 pm
Forum: C/C++
Topic: VP8 decoder
Replies: 4
Views: 2233

Re: VP8 decoder

VP8 at such a low resolution should probably work with software decoding (ffmpeg), provided that video presentation is accelerated. There is no dedicated hardware for VP8, but the GPU can supposedly accelerate decoding of VP8 somewhat (up to 480p). This hasn't been implemented, though.
by lb
Wed Oct 10, 2012 7:38 pm
Forum: Troubleshooting
Topic: cannot copy bootable SD card
Replies: 8
Views: 1331

Re: cannot copy bootable SD card

Did you perhaps copy to or from partitions (/dev/sdc1, etc.) instead of the whole card?
by lb
Wed Oct 10, 2012 3:07 pm
Forum: General discussion
Topic: ext3/4 and SD-card wear leveling
Replies: 134
Views: 53514

Re: ext3/4 and SD-card wear leveling

The driver just emits an "ERASE" command for the blocks in question.
by lb
Tue Oct 09, 2012 10:07 pm
Forum: Beginners
Topic: Best Video format for rPi
Replies: 4
Views: 8850

Re: Best Video format for rPi

It's nothing weird, just MPEG-4 part 2 aka XViD aka DivX. This can be decoded in hardware just fine. Generally, both H.264 and XViD/DivX should play fine, as long as no unusual features were used by the encoder. You should prefer H.264 simply because it's a great format and compresses much, much bet...
by lb
Tue Oct 09, 2012 4:41 pm
Forum: General discussion
Topic: ext3/4 and SD-card wear leveling
Replies: 134
Views: 53514

Re: ext3/4 and SD-card wear leveling

The discards do make it to the hardware, that's for sure. The SDHCI driver even includes a hack for SD cards that are especially slow at this. Please do not use the "discard" mount option. Trimming on demand is often very bad for performance. It's much preferable to run fstrim from time to time, jus...
by lb
Mon Oct 08, 2012 10:35 pm
Forum: General programming discussion
Topic: Easiest way to discover other RPs on the network?
Replies: 9
Views: 3303

Re: Easiest way to discover other RPs on the network?

yup, Avahi is the way to go. By default, Avahi already broadcasts the hostname via mDNS. This might be good enough already if you use a common hostname prefix.
by lb
Mon Oct 08, 2012 10:28 pm
Forum: Graphics, sound and multimedia
Topic: Volume control via a potentiometer
Replies: 4
Views: 2673

Re: Volume control via a potentiometer

Line outputs should have a relatively low impedance. Try 220-1K ohm, but I can't tell for sure if this will work well. Analog volume control is definitely better than using the software mixer, though. Reduced mixer volume is really bad for analog audio quality on the Pi! You should keep it at 100% a...
by lb
Mon Oct 08, 2012 5:00 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: SPI driver latency and a possible solution
Replies: 241
Views: 132910

Re: SPI driver latency and a possible solution

The patch is unreadable - you messed up formatting of many files. Can you make a proper patch?
by lb
Tue Oct 02, 2012 12:11 pm
Forum: Deutsch
Topic: Welche SD-Karte?
Replies: 13
Views: 24029

Re: Welche SD-Karte?

Das Raspberry Pi unterstützt die neueren UHS-Transfermodi nicht, mit denen mehr als (theoretische) 25 MB/s möglich werden. Die Geschwindigkeit bei sequentiellen Zugriffen ist aber auch nicht der springende Punkt. Praktisch alle SD-Karten bieten hier ausreichende Performance. Der "Benchmark" mit hdpa...
by lb
Tue Oct 02, 2012 11:37 am
Forum: Troubleshooting
Topic: USB - the Elephant in our Room
Replies: 802
Views: 260058

Re: USB - the Elephant in our Room

It looks like you can't really rely on the Linux kernel having low latencies. I wonder if it would be sensible and/or possible to split up the USB driver into two parts. A low-level part that does all the timing-critical stuff and is executed entirely in FIQs, and a high-level part that runs as a re...
by lb
Thu Sep 20, 2012 4:42 pm
Forum: Troubleshooting
Topic: USB - the Elephant in our Room
Replies: 802
Views: 260058

Re: USB - the Elephant in our Room

obcd, have you tried the latest firmware and kernel? The output quality of the integrated analog output should be greatly improved! Usually, it shouldn't be a problem that the output is limited to about 11 bits - music doesn't have more than about 10 bits of dynamic range.
by lb
Sat Sep 08, 2012 11:36 pm
Forum: Raspbian
Topic: [Project] Flash
Replies: 19
Views: 4636

Re: [Project] Flash

What features do you hope to receive that Gnash isn't providing you? I'm not hoping for anything. ;) Gnash simply does not work in a usable fashion at all with most Flash content, and this has been its state for years. Moreover, the Pi is simply too slow and restricted for most Flash content, and I...
by lb
Sat Sep 08, 2012 6:26 pm
Forum: Raspbian
Topic: [Project] Flash
Replies: 19
Views: 4636

Re: [Project] Flash

You are using Gnash, which is not a usable replacement for Adobe Flash at all. Gnash only implements a fraction of Flash's features and is very buggy and slow. Furthermore, hardware-accelerated video decoding isn't implemented. We'll never have a Flash implementation on the Pi that works well. Just ...

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