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  • What is a technique for 2D ray-box intersection that is suitable for old console hardware?

    - by DJCouchyCouch
    I'm working on a Sega Genesis homebrew game (it has a 7mhz 68000 CPU). I'm looking for a way to find the intersection between a particle sprite and a background tile. Particles are represented as a point with a movement vector. Background tiles are 8 x 8 pixels, with an (X,Y) position that is always located at a multiple of 8. So, really, I need to find the intersection point for a ray-box collision; I need to find out where along the edge of the tile the ray/particle hits. I have these two hard constraints: I'm working with pixel locations (integers). Floating point is too expensive. It doesn't have to be super exact, just close enough. Multiplications, divisions, dot products, et cetera, are incredibly expensive and are to be avoided. So I'm looking for an efficient algorithm that would fit those constraints. Any ideas? I'm writing it in C, so that would work, but assembly should be good as well.

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  • Why isn't Japanese software industry as strong as their hardware technology?

    - by Joan Venge
    I admire Japanese technology and their innovation. They always seem to be one step ahead of everyone else. But why isn't their software industry just as developed? Why aren't there any Japanese operating systems, high-end game engines, 3D digital content creation applications? I would like to see their take on these and I think it could bring alot of innovation. Btw I mentioned 3D software because the animation industry is strong there as well, but they are using North American software for this.

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  • What the different hardware temperatures listed in psensor, sensor viewer etc reffer to?

    - by cipricus
    I have installed psensor and see a list of temperatures, but listed as ”Temperature 1”, 2, 3 etc . I can only guess where the processor is: but who's who for sure? The same question stands for Sensors Viewer. I can also type sensors in Terminal but I get no more than that acpi -t gives Thermal 0: ok, 65.0 degrees C Thermal 1: ok, 37.9 degrees C Thermal 2: ok, 56.0 degrees C Thermal 3: active, 71.0 degrees C Considering psensor, I know for a fact that: - the temperature that varies most depending on the CPU use is Temp1 and it is one of the two highest - the other high temperature is Temp4 and it goes to the ceiling when using youtube/flash - Temp2 is very stable at a medium level of 50-60 degrees Celsius - Temp3 is by far the lowest and most imobile So, I guess Temp1 is the CPU temperature, and Temp4 is the GPU temperature. Temp2 and 3 must be the motherboard and the hdd. Does anybody know for sure?

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  • What does "kTriangles/s" mean in hardware graphics benchmark reports?

    - by swquinn
    I've looked around and found several sites offering benchmarking statistics for mobile platforms and I've been seeing the unit of measure as "kTriangles/s". Originally I misread this, missing the 'k'; does this translate to "thousand(s) of triangles/s", e.g.: 8902 kTriangles/s = 8,902,000 triangles/s (I'm pretty sure that my interpretation is correct, but I hope someone can confirm this for me) Thanks!

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  • Hardware question; booting ubuntu off of USB flash drive?

    - by Kon
    I'm currently running ubuntu off of a USB 3.0 flash drive on my laptop, and I have another USB 3.0 flash drive I use for storing larger files that I need to access and whatnot. But the issue is that both of the usb 3.0 flash drives don't fit next to each other at all, so I'm forced to use another usb 2.0 port located in a different spot on my laptop. Now my question is that if I use a USB 3.0 hub will that slow my connections down at all? or cause some sort of interference? Another question I had which I was unable to find anywhere on the internet is if there was a USB 3.0 hub with more than one upstream connection? Thanks for your time!

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  • why there is a lot change in the hardware support features in different linux os?

    - by TrazerWalker
    i am using lenovo b460 with 3 GB ram and 500 GB hard disk,(no graphics card). when i live boot Linux mint i was able to connect to WiFi.but when i booted up Ubuntu 11.4 i was not able to connect through WiFi.then later i installed Ubuntu 12.4 and then i got connected with WiFi, but after installing icons and themes through my unity i am not able to view the content in the terminal and the WiFi is also not connecting now even after i changed them all back. wireless connectivity

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  • Choosing the right TV tuner - USB or PCI TV tuners, hardware/software, DVB? Hybrid/combo/analog?

    - by Nucleon
    Greetings, I'll start with some background information so you know what I'm trying to accomplish and then get to my question. I work at a Television station in the US and we are working on setting up an online DVR/Podcast system for all of our newscasts. So basically we would be recording every newscast in HD, encoding it to flv/h.264 for viewing in a browser on flash compatible and iphone/ipad devices, eventually migrating to WebM when it's browser compliant. This task is theoretically pretty simple as it all it involves is a TV tuner device and a program like VLC, MythTV or whatever to schedule and dump it to a file, encode it with VLC/FFMPEG and push it to the streaming server. Now to the hardware, in order to accomplish that task, should I use an internal PCI tuner or a USB 2.0 tuner? Is there a difference? The bus speeds of both are not too far apart, and is the bus speed really relevant in this case? Does it matter if the device has a hardware encoder or a software encoder? On many sites the USB was recommended for ease of set up and use, but would it overly task a processor, or is that not a concern as long as it's a decent PC (at least duo core, 6gb ram). What's the difference between the stick USB and the Box USBs? To my understanding analog is basically gone in the US, so we would want a hybrid or combo tuner correct? How do those differ from DVB? Are there any other features or concepts which I am missing which may influence the recommended product. It would be ideal if the device which could work in both Linux and a Windows environment, to my knowledge most Hauppauge are? Example 1: PCI Hauppage http://www.newegg.com/Product/Product.aspx?Item=N82E16815116033 Example 2: USB 2.0 Box http://www.newegg.com/Product/Product.aspx?Item=N82E16815116029 Example 3: USB 2.0 Stick http://www.newegg.com/Product/Product.aspx?Item=N82E16815116031 Any guidance from the Superusers would be much appreciated!

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  • Can a hardware firewall block a server accessing its OWN UNC shares?

    - by Simon
    I need to set up a UNC share for my hosted dedicated server to access a share on itself. Unfortunately TFS requires a UNC share. I am on a Windows Server 2008 Standard SP2 64bit dedicated server behind a PIX 501 firewall hosted with GoDaddy. I just cannot get the server to access itself and get this error: Windows cannot access \\SERVER\SHARE Check the spelling of the name.. etc. I've found numerous questions about this but no answer to my problem. Server 2008 Standard x64 SP2 Workgroup - not domain Windows Firewall is off Computer browser service is on I am trying to access \\MYMACHINE\TFS-BUILDS by typing in - or double clicking. Neither works. Machine has single network card Filesharing wizard says share was ok Share was showing under 'Computer management' Permissions are set to 'everyone' full control No obvious errors in eventlog Reboot didn't fix it Unfortunately I cannot try to access other shares in or out of this machine because it is a hosted dedicated server and the only machine behind a hardware firewall. The only thing left i can think of is that the hardware firewall needs to be configured. Is this possible? Does 'UNC traffic' go out of the machine and then back in again?

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  • What's the piece of hardware listening on Facebook's or Wikipedia's IP address?

    - by Igor Ostrovsky
    I am trying to understand how massive sites like Facebook or Wikipedia work, for my intellectual curiosity. I read about various techniques for building scalable sites, but I am still puzzled about one particular detail. The part that confuses me is that ultimately, the DNS will map the entire domain to a single IP address, or a handful of IP addresses in the case of round-robin DNS. For example, wikipedia.org has only one type-A DNS record. So, people from all over the world visiting Wikipedia have to send a request to the one IP address specified in DNS. What is the piece of hardware that listens on the IP address for a massive site, and how can it possibly handle all the load coming from the requests for users all over the world? Edit 1: Thanks for all the responses! Anycast seems like a feasible answer... Does anyone know of a way to check whether a particular IP address is anycast-routed, so that I could verify that this really is the trick used in practice by large sites? Edit 2: After more reading on the topic, it appears that anycast is not typically used for dynamic web content. Anycast is usually used for UDP (e.g., DNS lookups), or sometimes for static content. One interesting thing to note is that Facebook uses profile.ak.fbcdn.net to host static content like style sheets and javascript libraries. Each time I ping this name, I get a response from a different IP address. However, I can't tell whether this is anycast in action, or a completely different technique. Back to my original question: as far as I can tell, even a large site will have a single expensive piece of load-balancing hardware listening on its handful of public IP addresses.

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  • How do I lower the hardware volume? (volume too high)

    - by Zom-B
    I have a 4yo Dell laptop with Windows XP Pro (modern ones unfortunately don't have a physical volume knob), and lately I'm using my Apple earphones, because they have much better low frequency response than my $10 earphones. They also have the side effect of being much louder. To give an indication of my agony, for most tasks (movie, music, games) I have my main volume at 3 ticks: drag to 0 with the mouse and press the up key 3 times (the handle does not even raise 1 pixel) and my wave volume at 50%. I notice that when I do this, I have a lot of digital noise, because I'm using just a tiny fraction of the 16-bit space. If I drag the Wave slider down until I barely hear the audio, it becomes really distorted and noisy, indicating that this is digital volume (in the DirectSound driver or something) and not hardware volume. I experimented in Audition. When I make a tone of 1000Hz at -50db, (all windows volumes at max) the volume is just below my pain threshold. When I zoom in to see how high the sample values reach, I see that just 8 of the 16 bits are used (about -100 ~ 100). When I generate such tone at -80db (minimum I can specify) then I can still clearly hear the tone, although really noisy. When I zoom in, I see that just 3 out of 16 bits are used. I created a squarewave tone that is just 1 bit high, and I can still hear it! For most uses, this is not a big problem (audiophiles will disagree!), as I just have more noise than usual (about the same as old 8 bit hardware), but I'm also in the process of programming a hearing test program, in which case this problem is a death blow as the test subjects will even hear tones at the bottom of the theoretical range (lowering the windows volume is futile, see above) (I cannot update drivers, as Dell has discontinued XP support for my model)

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  • Zero downtime deployment (Tomcat), Nginx or HAProxy, behind hardware LB - how to "starve" old server?

    - by alexeypro
    Currently we have the following setup. Hardware Load Balancer (LB) Box A running Tomcat on 8080 (TA) Box B running Tomcat on 8080 (TB) TA and TB are running behind LB. For now it's pretty complicated and manual job to take Box A or Box B out of LB to do the zero downtime deployment. I am thinking to do something like this: Hardware Load Balancer (LB) Box A running Nginx on 8080 (NA) Box A running Tomcat on 8081 (TA1) Box A running Tomcat on 8082 (TA2) Box B running Nginx on 8080 (NB) Box B running Tomcat on 8081 (TB1) Box B running Tomcat on 8082 (TB2) Basically LB will be directing traffic between NA and NB now. On each of Nginx's we'll have TA1, TA2 and TB1, TB2 configured as upstream servers. Once one of the upstreams's healthcheck page is unresponsive (shutdown) the traffic goes to another one (HttpHealthcheckModule module on Nginx). So the deploy process is simple. Say, TA1 is active with version 0.1 of the app. Healthcheck on TA1 is OK. We start TA2 with Healthcheck on it as ERROR. So Nginx is not talking to it. We deploy app version 0.2 to TA2. Make sure it works. Now, we switch the Healthcheck on TA2 to OK, switch Healthcheck to TA1 to ERROR. Nginx will start serving TA2, and will remove TA1 out of rotation. Done! And now same with the other box. While it sounds all cool and nice, how do we "starve" the Nginx? Say we have pending connections, some users on TA1. If we just turn it off, sessions will break (we have cookie-based sessions). Not good. Any way to starve traffic to one of the upstream servers with Nginx? Thanks!

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  • How to open write reserved excel file in python with win32com?

    - by user261935
    Hello, I'm trying to open a write-protected ms excel 2007 file using win32com in python -- I know the password. I can open it with user input of the password into the excel dialog box. I want to be able to open the file without any user interaction. I've tried the following, but it still pops up the dialog box. app.Workbooks.Open("filename.xls", WriteResPassword="secret") Any ideas what I'm doing wrong please? Thanks, Dave.

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  • How to "Un-Eject" a USB Flash drive -- Eject is easy (safely remove hardware), but what about Un-Eje

    - by Jian Lin
    There are times after I eject a USB Flash drive, I want to copy some more files over to the USB Flash drive. In this case, do I always need to unplug the drive and plug it back in? Is there a way to "reconnect" or "un-eject" the drive? To eject, that are two ways: 1) Right Click the drive (say H:) and choose Eject 2) Click "Safely remove hardware" from the icon tool But there seems to be no way to un-eject or reconnect a drive.

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  • List DB2 version, OS and hardware on Linux? (aws image)

    - by mestika
    Hello everybody, I'm not that familiar with Linux but I'm currently working on a aws image for an assignment and I need to display the DB2 version, the OS and the hardware. Is there a commando or program of some sort I can use for this purpose? I tried a rpm called "Bonnie" but that only writes the throughput for the system. Thanks Mestika

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  • List DB2 version, OS and hardware on Linux? (aws image)H

    - by mestika
    Hello everybody, I'm not that familiar with Linux but I'm currently working on a aws image for an assignment and I need to display the DB2 version, the OS and the hardware. Is there a commando or program of some sort I can use for this purpose? I tried a rpm called "Bonnie" but that only writes the throughput for the system. Thanks Mestika

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  • Do I need a hardware firewall for Win 2003?

    - by user531723
    We have had a Win 2003 server at a co-lo for a while. It is used as a web server and has a very cheap hardware firewall between it and the internet. Ports 3389 and 80 are the only ones forwarded to the server. I am doing some upgrading and wondering if I really need the firewall. Are there any drawbacks to just using the Win 2003 built in firewall to make sure only traffic on 3389 and 80 get through?

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  • Any hardware/software routers that support Full Cone NAT?

    - by Ian Boyd
    i'm trying to get Teredo to function on my machine. Most routers, it seems, refuse to forward packets from any host other than the one i specifically connected to first. Teredo requires full Cone NAT in order to function. Does any router, hardware or software, allow full cone NAT? Is this an oversight by the designers of Teredo that nobody, in practice, can use it? i've tried m0n0wall pfsense D-Link Linksys SMC

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  • Does ZFS replace the need for hardware/software RAID?

    - by user53744
    I want to provide protection against data loss on my servers. Typically, I'd use hardware RAID 1 or 5, but I've been reading up on ZFS. Is it correct that ZFS itself provides RAID 1 or 5 like data protection WITHOUT needing a RAID controller card? If so, I assume a single hard drive is not enough to provide data protection since if that drive fails, all data fails, so how many hard drives do I need to be running for ZFS to provide this protection?

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  • For how long should I expect my hardware to work?

    - by Makach
    I got this old box with windows xp home. It works perfectly, except the occasional blue-screen when shutting down the machine. How long should I expect this, or any, machine to work, when will the hardware start failing and should I worry about silly things like upgrading the os? What is the TTL on HW you purchase today?

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