Cookie Thief
hmm. You see I think they want me to use a strcpy fucntion, and they don't want it done that I put 1 value for 1 value if you know what I mean, I think they want me to be able to take a value from a array and point it to another value from another value, I'll try and post it laterOriginally Posted by kohlrak
Disciple of Zerthimon
Well, nowadays processors are pretty fast. 1 GHz ~ 1 billion operations per second.
You are aware that the while loop is pretty freaking fast, aren't you? I mean, it's almost at machine code level, taking up two clock cycles at most.
BTW, what IS the trick, then? Stop being so mysterious about it.
EDIT: I checked out its implementation in g++. Definitely more complicated than a simple while. And yes, it does have that as well, several instances, at that. So it's speed truly is lower than a non-object version. But it's more robust, that's for certain.
Download the library source from here, check in the libg++/src/ directory for Strings.h and Strings.cc
ftp://ftp.mirrorservice.org/sites/so....8.1.3.tar.bz2
Last edited by pkt-zer0; 26th-December-2005 at 21:53.
'ajqa'QItty
Not as fast as you think... lol 1ghz... based on my 2.5 i'd have to say that's about 1000 increments and printing them out per second.
If i knew i wouldn't ask. =pBTW, what IS the trick, then? Stop being so mysterious about it.
Is it commented at all? And is it filled with a bunch of nonsence global variablse like "_t" then have a "_T" then have "_Tc" and "_tC" and another "_TC"? X'DEDIT: I checked out its implementation in g++. Definitely more complicated than a simple while. And yes, it does have that as well, several instances, at that. So it's speed truly is lower than a non-object version. But it's more robust, that's for certain.
Download the library source from here, check in the libg++/src/ directory for Strings.h and Strings.cc
ftp://ftp.mirrorservice.org/sites/so....8.1.3.tar.bz2
Disciple of Zerthimon
Actually, faster. Try repeating a single operation in a loop (without printing it to screen), and timing it with GetTickCount, maybe. It IS fast, believe me. I mean, C code executes in virtually 0 seconds, unless there's something involving a peripheral (screen, harddrive). So yeah, the CPU and memory are hella fast.
Well, it's an open source project, meaning anyone could modify it, so yeah, it's pretty well commented. It is more readable (and more compact) then most code I produce, anyway.
'ajqa'QItty
You forget, when you're talkin' FPS and stuffs, ick... A second is like forever, especially if you're like me with ADHD. lol
The more compact, the better... well.. the less code the better. lolWell, it's an open source project, meaning anyone could modify it, so yeah, it's pretty well commented. It is more readable (and more compact) then most code I produce, anyway.
Another good one, how much does calling a function slow down a computer verses a macros? And how much more space does it take on the compy? And! Another one, how much more does it take to call from a DLL?
As for pointies... I have a good challenge for you if you ever get bored PKT. Write a source code that when compilled and run, it'll copy itself from the ram and write it to a file and save it as ".ram". Chances are it'll crash alot... but i have a funny feeling we might get something intresting from it... Who knows what we'd learn if it succeeded?
EDIT: Reminds me of looking at the direct X API. lol
EDIT2: Hm... I wonder how you can really output anything to the screen if C++ has no functions of it's own... And i wonder how a hello program would look in ASM... i got a disassembler here but it only opens ".com" files. lol
EDIT3: Holy crap... I managed to open up an exe file in this thing and... o.o Dude, it looks like somthing i once saw in visual C++ 6.0 when debugging a file one time...
Last edited by kohlrak; 28th-December-2005 at 07:33.
Disciple of Zerthimon
Yeah, but it makes a difference, computing 1000 of 10 billion operations a second. If you raise the times you execute the loop high enough, it will take more than a second. But it's interesting to see how high it goes.
Macros are simply text replaced with other text in the code, during compile time. So it doesn't slow anything at all, only what's executed within. With functions, the return address and values go on the stack, so your only problem would be that filling, and the program crashing. Don't' worry, it's pretty large, for this purpose at least, but going into infinite recursion crashes it, recursion itself eats up pretty much of the stack, as well. With the stack being the part of the memory that's accessed with the greatest speed, that's not quite good.
DLLs are Dynamically Linked Libraries, meaning they get linked run-time, more precisely on start. I don't think that's much slower (obviously you'll get smaller executable sizes than including the libraries in the EXE itself), but version incompatibilities could be a problem sometimes.
I'm not sure if Windows would let me do that, kinda like it wouldn't let me access the video memory directly, still, worth a try. Anyway, the code is obviously there in the EXE file in some form. I'm not sure if it's self-extracting, or uncompressed.
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Links are hidden from guests. Please register to be able to view these links. Arrgh, doesn't work. Tried copying memory from an array containing a sample string, and it wouldn't let me go much further than the end of the array. Gotta learn the Windows API sometime.
C was designed for portability. Since not all computers even have a screen, you don't get standard methods for output. The good thing is you could even code for whatever weird sort of terminal you'd like.
Yep, Assembler is nice. Even nicer if you understand what things do.
BTW, here's some code a guy I know wrote. He's pretty into low-level coding, so yeah. Beware.
Member
Why would anyone want to program in assembly anymore? Any speed losses from C/C++ (if there are any...) are negligible considering the portability, readability, and reusability of higher level code.
'ajqa'QItty
meh, of all things, i realized Microsoft word uses both OCX and DLLs. lol
Cookie Thief
hmm, I think I'm going to have to ask a question, at the moment, my morse code program has a menu that work from number presses, (unfortunatly it cuts out of the program if you do not select a correct program) also I have 3 sets of chars arrays in place (alphabet, numeric, and morse) The morse is set in sets of 4 (with spaces if the code is less then 4 characters long) I am curious how to get it so that it selects 4 charecters of morse from one letter? I'll try not to post my code as I don't Want an answer, just a few pointers
Disciple of Zerthimon
You mean, how to identify each letter with it's corresponding morse code?
You could write a function (if you've learnt about them, that is), that does the conversion.
Or, and I'd say this is simpler, have the character's ASCII codes identify the correct block of the morse code array. So that the code['o'] would store the "---" string, and code['s'] would store "...", and so on.
Then you could simply just read the next character, and you'd immediately know the position of the corresponding morse code in the array.
↑ ↑ ↓ ↓ ← → ← → B A START
Ok people, show some good inverse kinematics tutorials. I've looked at this one for a while now and I partly understand how it's done. But my math skills are almost completely gone so I kinda need some help here...
The concept shown in the link above seems pretty easy, but I can't figure out for life how to calculate the angles in the triangle and how what to do after that... -___-
Please help me!
Disciple of Zerthimon
c� = a�+b�-2ab*cos γ
And you also have
a/b = sin α / sin β
A, B, C are vertices of a triangle, a, b, c are the edges opposite them, α, β, γ are the angles at the corresponding vertex.
I do not know much about IK, but doesn't that mean something like that you have a few fixed joints, some moveable ones, the distance of the joints are set, and then you start moving a joint, and the rest move according to preset rules (joint's angle must not exceed certain limits, and so on)
↑ ↑ ↓ ↓ ← → ← → B A START
Yeah you are pretty correct. This is a pretty darn good idea of what IK is and exactly what I'm trying to achive here:
http://www.enedahl.com/index.asp?page=shockwave_ik
Quite awesome if you ask me.Oh and thanks for the formulas. I'm sure they will help me when I try to decipher the "tutorial" I posted in my last post.
Disciple of Zerthimon
Yep, I got it. Pretty neat. But, that it's being done in Shockwave shows that it's not too complex, thankfully. If free joints weren't connected to fixed ones, however, you'd have a bit more trouble than calculating triangles on your hand.
↑ ↑ ↓ ↓ ← → ← → B A START
I've found another method that I'm gonna try to get working. Because the one I posted above will only work if the leg consist of two parts. I might want to use more.
Check this out: http://freespace.virgin.net/hugo.elias/models/m_ik.htm
Yet again, I understand the concept but I don't remember shit when it comes to math... How do I calculate the force vector? And how do I calculate the dot product?
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