forums.ps2dev.org

[AnonymousTipster]

I have come to a snag in my current project which requires an ATan function. I don't think that this can be solved by a simple array of numbers like sin and cos. There 'seems' to be sceFpuSin and sceFpuCos, but I can't see a sceFpuATan function. I couldn't see a function like this in the PSPSDK, and was wondering if somebody can think of a solution to this.

Thanks.

[nol33t]

use the math lib ( #include<math.h> and -lm at the link )

see also http://forums.ps2dev.org/viewtopic.php?p=19341#19341

[Treat]

http://en.wikipedia.org/wiki/Taylor_series#List_of_Taylor_series_of_some_common_functions

[AnonymousTipster]

Well, the compiler is finding s_atan.c (newlib/libm/math/s_atan.c), but it gives me lots of undefined referrences to '__adddf3' and '__muldf3'. I have #include <Math.h> and have put -lm for my linker. I think it is also finding the s_atan.o, which has been precompiled. It must be something simple, but i'm not sure what i'm doing wrong.

[ector]

Avoid double precision math on the PSP as it is likely to be dog slow because of the lack of double precision floating point hardware. It has a fast single precision FPU though, not to speak of the VFPU which still has not been publically documented..

[pixel]

Missing -lgcc, obviously.
_________________
pixel: A mischievous magical spirit associated with screen displays. The computer industry has frequently borrowed from mythology. Witness the sprites in computer graphics, the demons in artificial intelligence and the trolls in the marketing department.

[AnonymousTipster]

I've put the -lgcc in, and that stops the errors, but the compiler complains : psp-ld: cannot find -lgcc.

[pixel]

Something's wrong with your toolchain then. Look if the libgcc.a file is in the toolchain directory. If yes, the toolchain is misplaced, and you need a -L on the command line to specify the path to libgcc.a. If no, your toolchain is fucked up and there's nothing I can do about it.
_________________
pixel: A mischievous magical spirit associated with screen displays. The computer industry has frequently borrowed from mythology. Witness the sprites in computer graphics, the demons in artificial intelligence and the trolls in the marketing department.

[mrbrown]

Well, you could just tell him to link with psp-gcc and not psp-ld, since that's what we've told everyone else who has the same problem.

[pixel]

Aaaahhh, indeed, I didn't see he was using psp-ld and not psp-gcc...
_________________
pixel: A mischievous magical spirit associated with screen displays. The computer industry has frequently borrowed from mythology. Witness the sprites in computer graphics, the demons in artificial intelligence and the trolls in the marketing department.

[AnonymousTipster]

Well, the main part of my .sh file looks like this:

[mrbrown]

Switch to PSPSDK and all of these problems will go away.

http://wiki.ps2dev.org/psp:programming_faq

[AnonymousTipster]

Ok, thanks, I'll get onto porting it after my first release.