Quick Jump Daily Digest

**Davee** · 09-01-2008, 01:16 PM

Zitat von yaustar

Bad. You are initialising the random number generator every time you call GetRandom. This will give you skewed numbers and depending on what the Init function call does, expensive especially if called multiple times per frame.

In addition:

Code:

return ((min + sceKernelUtilsMt19937UInt(&ctx)) % div);

div is undeclared and the logic is incorrect in getting a number between min and max.

My apologies.

Code:

void InitRandom(SceKernelUtilsMt19937Context *ctx)
{	
	u32 tick = sceKernelGetSystemTimeLow();
	sceKernelUtilsMt19937Init(ctx, tick);
}

int GetRandom(int min, int max, SceKernelUtilsMt19937Context *ctx)
{	
	return (sceKernelUtilsMt19937UInt(ctx) % (max - min + 1)) + min;
}

That seems more accurate I think. I've not tested it yet, but, it should work.

Alternatively, you can set the ctx as a global and modify it there.

**Access_Denied** · 09-01-2008, 03:08 PM

Zitat von Davee

My apologies.

Code:

void InitRandom(SceKernelUtilsMt19937Context *ctx)
{	
	u32 tick = sceKernelGetSystemTimeLow();
	sceKernelUtilsMt19937Init(ctx, tick);
}

int GetRandom(int min, int max, SceKernelUtilsMt19937Context *ctx)
{	
	return (sceKernelUtilsMt19937UInt(ctx) % (max - min + 1)) + min;
}

That seems more accurate I think. I've not tested it yet, but, it should work.

Alternatively, you can set the ctx as a global and modify it there.

Gee, thanks for that. I'm so glad you guys figured it out. WAAAY better than my function.

Zitat von Access_Denied

So, I found this random number function, but it doesn't seem to work. It always puts out the same number. Any ideas? :ROFL:

Code:

int getRandomNumber()
{
     return 3;
}

**Khatharr** · 09-01-2008, 05:40 PM

Zitat von JaX3RiR

Code:

int gen_rand(void)
/* Random number in range of 0 to 99 */
{
   int n;
   n=random(100);  /* n is random number in the range of 0 - 99 */
   return(n);
}

:ROFL:

'random()'? Is that defined in the SDK?

**basfreak** · 09-01-2008, 10:04 PM

I thought it was:

Code:

int GetRandom(int upTo) {
    return rand() % upTo;
}

**yaustar** · 09-02-2008, 02:12 AM

rand() is the Standard Library's random number generator. It isn't a great one but is usually good enough.

**basfreak** · 09-02-2008, 06:43 AM

Hi, i want too increase my volume with a prx is this possible?

Code:

int sceAudioChangeChannelVolume(int channel, int leftvol, int rightvol);

**Monkit** · 09-02-2008, 07:55 AM

Zitat von Monkit

anyone can help mi fix the tiling->mirror->centreX&Y->rotate and will not crash problem?

if can't then would:
compare to using tileset and cutting out all the tiles into 35x35 images and frequent loading and unloading them (.png), which one will have a better effect on the speed of the homebrew? (1 tileset compared to 7 images, or maybe even 14)

in order to prove that OSLIB crashes when you mirror a image whose centre X and centre Y or Angle is not at 0, i have purposely edited the mickey example (sprite_src) file which was given as a sample in OSLIB

Before:

Spoiler for the Code before editing:

After:

Spoiler for The code after editing:

I added in this

Code:

	if (osl_keys->pressed.select) oslMirrorImageH(mickey);

And so if you just tune mickey around a bit and press select. It will crash. Not just my program.. that mickey source code crashes too.

somehow if we mirror it vertically it does not happen though

**yaustar** · 09-02-2008, 10:52 AM

Then it is a bug with the library. Contact the author.

**MiKeY188** · 09-02-2008, 03:44 PM

Could any one tell me what library "sceCtrlBufferPeekPositiv e" is included in.

Here's my libraries.

Code:

#include <pspdebug.h>
#include <pspctrl.h>
#include <pspkernel.h>

Code:

main.o: In function `MainMenu':
main.c:(.text+0x9c): undefined reference to `sceCtrlBufferPeekPositive'
main.c:(.text+0xfc): undefined reference to `sceCtrlBufferPeekPositive'
main.o: In function `main':
main.c:(.text+0x230): undefined reference to `sceCtrlBufferPeekPositive'
collect2: ld returned 1 exit status
make: *** [.elf] Error 1

**Raphael** · 09-02-2008, 05:24 PM

add -lpspctrl to the LIBS = line in your make file

**Digikid13** · 09-02-2008, 07:38 PM

I wanted to code in windows without Cgwin and in Dev-C++ or Visual C#.
Can anyone help me.
-=Double Post Merge =-
A BIG-OL list of tutorials would be nice to.
-=Double Post Merge =-
thanks

**Anti-QuickJay** · 09-02-2008, 08:58 PM

You don't code in cygwin in the first place. cygwin is a compiler while Dev-c++ is an IDE.

psp-programming.com has some nice tutorials but it is recommended to learn how to code on a PC first then move onto the PSP as you'll get a better gasp on C/C++

EDIT: Don't listen to me, freeplay corrected me.

**FreePlay** · 09-02-2008, 09:25 PM

cygwin is not a compiler. gcc is a compiler. cygwin is a posix environment for windows.

**MiKeY188** · 09-03-2008, 07:58 AM

my code is this:

Code:

printf(" -> example");

how do i make -> turn red once i select it on the menu?

Code:

printf(" ex (red) ex (blue)");

i want the first ex in red and the 2nd in blue if you could help that's great :)

**Moose** · 09-03-2008, 08:00 AM

Are you using OSLib?

**MiKeY188** · 09-03-2008, 08:02 AM

no basic C

**Bubbletune** · 09-03-2008, 08:03 AM

Zitat von MiKeY188

my code is this:

printf(" -> example");

how do i make -> turn red once i select it on the menu?

printf(" ex (red) ex (blue)");

i want the first ex in red and the 2nd in blue if you could help that's great :)

Use pspDebugScreenSetTextColo r.

**eldiablov** · 09-03-2008, 08:05 AM

You may be going about this the wrong way. Get on msn and i'll explain.

**MiKeY188** · 09-03-2008, 08:07 AM

Ok going on now thanks.

**Digikid13** · 09-03-2008, 08:30 PM

Zitat von FreePlay

cygwin is not a compiler. gcc is a compiler. cygwin is a posix environment for windows.

I know what Cgwin is =.= I need a tutorial that doesn't need me to use it like tool chain compiled for win32. I can't find any.

**NoEffex** · 09-03-2008, 08:45 PM

I'm not entirely sure that's possible. I could be wrong, but, it's linux based(unix, whatever), so it won't really work on windows.

**Digikid13** · 09-03-2008, 10:45 PM

Well there was one, but the link was dead.

**Khatharr** · 09-04-2008, 03:42 PM

Dev-C++ can use either mingw or cygwin as its compiler environment. I tried to set it up once but I got frustrated with its confusing and non-intuitive options and gave up. I use Dev-C++ to compile my windows stuff, but I use SciTE and cygwin for my PSP stuff.

It's possible, but yeah, without that thread I have no clue how to do it. Maybe someone with a little more cygwin experience could take a look?

Also, not to start any trouble, (not intentionally, anyway) but why do people keep suggesting that everyone learn to use C for the PC before they learn to use C for the PSP? It's the same language and it's portable to whatever you can compile for.

I understand that most tutorials and guides are written geared toward pc systems, but apart from stdin/stdout the exact same knowledge typically applies to the PSP.

Maybe it's just me. *shrug*

**michaelp** · 09-04-2008, 04:07 PM

Zitat von Khatharr

Dev-C++ can use either mingw or cygwin as its compiler environment. I tried to set it up once but I got frustrated with its confusing and non-intuitive options and gave up. I use Dev-C++ to compile my windows stuff, but I use SciTE and cygwin for my PSP stuff.

It's possible, but yeah, without that thread I have no clue how to do it. Maybe someone with a little more cygwin experience could take a look?

Also, not to start any trouble, (not intentionally, anyway) but why do people keep suggesting that everyone learn to use C for the PC before they learn to use C for the PSP? It's the same language and it's portable to whatever you can compile for.

I understand that most tutorials and guides are written geared toward pc systems, but apart from stdin/stdout the exact same knowledge typically applies to the PSP.

Maybe it's just me. *shrug*

Because it's a lot easier to run a program on a computer, rather than have to copy it to a PSP?
And because there's more beginner resources? And support?
And the libraries are different?
And because a hello world on the PSP in C is probably around 15 lines, and on a computer, 4 or 5?

**Khatharr** · 09-04-2008, 06:47 PM

*Copying the program to the PSP is more of a basic OS-use issue than a programming issue.

*C is a portable language, not tied to any specific device or environment. The programmer can read guides on C intended for use on a PC and use the same knowledge on the PSP without needing to code a PC app first.

*If the programmer's goal is to make PSP apps then PC-specific libs are irrelevant to accomplishing that goal. The programmer is better off learning the libs they plan to use for their app rather than the ones they don't.

Code:

#include <pspkernel.h>
PSP_MODULE_INFO("hw", 0, 1, 1);
int main() {
  pspDebugScreenPrintf("Hello, world.");
  sceKernelDelayThread(10000000);
  sceKernelExitGame();
  return 0;
}

Eight.

Two less if you ignore compiler warnings.

At any rate, my point is that if someone wants to make PSP programs in C then it seems sensible to me that they ought to learn to write PSP programs in C rather than for some other platform. You may just as easily say that an aspiring PC programmer should code for the PSP first.

**yaustar** · 09-05-2008, 01:17 AM

Zitat von Khatharr

At any rate, my point is that if someone wants to make PSP programs in C then it seems sensible to me that they ought to learn to write PSP programs in C rather than for some other platform. You may just as easily say that an aspiring PC programmer should code for the PSP first.

Quicker turnaround times. (Programming->compiling->executing->debugging)
Much easier debugging tools (most IDES come with a GUI debugger which works out of the box)
Tools and compiler are generally complete and more beginner friendly (i.e download and go within 5 minutes).

This generally means that more time is spent actually programming and debugging effectively (and therefore learning) rather then messing around with tools working why X doesn't run on firmware X.XX.

As you said, C and C++ is the same for any platform, so why not have them learn it on a platform that is more beginner 'friendly' for programming?

**Khatharr** · 09-05-2008, 02:14 PM

Maybe it's just my way of thinking. I dunno. If somebody is completely new to programming at all then maybe they should spend some PC time with something just to get the general idea of how a program works. (But then again, there's LuaPlayer as well...)

I just feel a little put off when I see people told to essentially 'go elsewhere' when they ask questions, even if they're uber-noob questions. Again, maybe it's just my point-of-view, and I do recognize that I am not generally 'mentally sound'. Just seems to me that pointing them to a related C tutorial/manual/text-of-other-kind would be more effective. Generally I see people who don't know C yet get told 'learn PC C' rather than 'you need to focus on improving your syntax', etc, etc.

I'll give you the point with the debugger but I've seen some pretty crappy debuggers out there in IDEs as well.

Meh, maybe you're right. I guess it doesn't matter.

**yaustar** · 09-05-2008, 03:02 PM

Zitat von Khatharr

Generally I see people who don't know C yet get told 'learn PC C' rather than 'you need to focus on improving your syntax', etc, etc.

I think you are mis-interpreting the point. It isn't learn 'PC C', but learn 'C on PC' as turnaround times are quicker, etc. Rather then spending lots of time trying to get tools to work right (how many threads have you seen about installing the toolchain for example), they could spend that time actually learning the language and not get caught up in the PSP specifics.

It is a matter of opinion but the general consensus is to learn programming and the language on the easiest platform possible to minimise the possible number of 'distractions' that get in the way.

I'll give you the point with the debugger but I've seen some pretty crappy debuggers out there in IDEs as well.

I agree there are pretty poor ones out there but both GDB (comes with Code::Blocks and Dev Cpp IIRC) and Visual Studio debugger are pretty standard and robust.

**Digikid13** · 09-05-2008, 06:13 PM

I still need a way to dev for psp without cgwin emulator.

**NoEffex** · 09-05-2008, 07:13 PM

Theres this..

Code:

http://www.megaupload.com/?d=YP4H9HAM

Got it from somewhere on here a while ago. It's iffy at best, though.

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