C/C++ Programming Help Thread

[slicer4ever]

bleh IWN already took care of the 1.5 starting issue by putting a nice little message saying please start your game under 3xx kernel

anyways sg57 i'm already on IRC ton's you should join us, it's how IWN helped me with getting circle collision working on my Impact game

which i love the method IWN(and i feel stupid for what i had come up with) i can apply it to nearly any basic geometry shape=-)

anywho hope to see you on irc sg=-)

[SG57]

What channel are you on lol im on psp-programming and pspdev pretty regularly.

[slicer4ever]

o i thought you went to irc.malloc.us, or defiance, etc, etc on #exo (redirection of #psp), bleh but IWN told me that you went on freenode and not the servers i cruise so i'll pop on #psp-programming on freenode from now on

[swizl]

I'm fairly new to c programming (in general) and I want to know how you can give a defined variable a value by reading a .txt file (something like the dofile() function in LUA)
example:I need to give a value to a certain variable (F) I've declared in the program by reading a .txt file that has ,for instance, a line that says F = 1

--swizl

[_df_]

I'm fairly new to c programming (in general) and I want to know how you can give a defined variable a value by reading a .txt file (something like the dofile() function in LUA)
example:I need to give a value to a certain variable (F) I've declared in the program by reading a .txt file that has ,for instance, a line that says F = 1

--swizl

fgets your line of text into a buffer. run atoi or strtoul or its friends at the right offset to the number.... strchr/isspace etc are your friends. or get a string library like bstring.

[swizl]

run atoi or strtoul or its friends at the right offset to the number....

its friends? care to explain?

[_df_]

ato_i == integer. it has friends for float..

[yaustar]

By 'friends', he/she means 'similar functions'.

[_df_]

hey yauster... nice to see familiar people ;) i dont go much anymore to the gp32x forums... are you mostly working on psp stuff now over gp2x? I think pandora will be out of my price range (and I dont quite like its aesthetics)..

[yaustar]

Honestly I am waiting on the Pandora, I am just working on some cross platform stuff at the moment and actual work.

[bnc9]

I tried using SG57's fading in and out example(that he gave me a few posts ago) with Psilocybeing's graphics.h and here's what i got:

Spoiler for code:

#define RGBA(r,g,b,a) ((r) | ((g)<<8) | ((b)<<16) | ((a)<<24))
#define RGB(r,g,b) ((r) | ((g)<<8) | ((b)<<16))

void FadeIn(int speed,Image* img, int width , int height,int imgx,int imgy){
int i = 255;
Color Alpha = RGBA(0,0,0,i);
while(1){
fillImageRect(Alpha,0,0,w idth,height,img);
blitAlphaImageToScreen(0, 0,width,height,img,imgx,i mgy);
i -= speed;
if(i < 0.0f){
break;
}
}
}
void FadeOut(float speed,Image* img,int width,int height,int imgx,int imgy){
int i = 0;
Color Alpha = RGBA(0,0,0,i);
while(1){
fillImageRect(Alpha,0,0,w idth,height,img);
blitAlphaImageToScreen(0, 0,width,height,img,imgx,i mgy);
i += speed;
if(i < 255.0f){
break;
}
}
}

I have 2 questions and 1 problem:
Question: Is there a better way to do this?
Question: Does graphics.h allow Alpha as part of a color?
Problem: I tried running this code as part of a project I'm helping a friend with and when I try running the program my PSP crashes (yes I've checked if the .png's are interlaced or not(like the last time I had a prob like this))
PLZ HELP
EDIT: Sorry for the code formatting for some reason it's not coming in the spoiler the way it's supposed to.

[FigMan]

how can i use a custom module_start in a prx. when i compile it, i get the error "multiple definition of `module_start'"

here is my main.c

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

#define printf pspDebugScreenPrintf

PSP_MODULE_INFO("prx", 0, 1, 0);

int module_start(SceSize args, void *argp)
{
// variable initialization
return 0;
}

int module_stop(SceSize args, void *argp)
{
return 0;
}

[Archaemic]

Replace "build.mak" with "build_prx.mak" in the Makefile.

[SG57]

I tried using SG57's fading in and out example(that he gave me a few posts ago) with Psilocybeing's graphics.h and here's what i got:

Spoiler for code:

#define RGBA(r,g,b,a) ((r) | ((g)<<8) | ((b)<<16) | ((a)<<24))
#define RGB(r,g,b) ((r) | ((g)<<8) | ((b)<<16))

void FadeIn(int speed,Image* img, int width , int height,int imgx,int imgy){
int i = 255;
Color Alpha = RGBA(0,0,0,i);
while(1){
fillImageRect(Alpha,0,0,w idth,height,img);
blitAlphaImageToScreen(0, 0,width,height,img,imgx,i mgy);
i -= speed;
if(i < 0.0f){
break;
}
}
}
void FadeOut(float speed,Image* img,int width,int height,int imgx,int imgy){
int i = 0;
Color Alpha = RGBA(0,0,0,i);
while(1){
fillImageRect(Alpha,0,0,w idth,height,img);
blitAlphaImageToScreen(0, 0,width,height,img,imgx,i mgy);
i += speed;
if(i < 255.0f){
break;
}
}
}

I have 2 questions and 1 problem:
Question: Is there a better way to do this?
Question: Does graphics.h allow Alpha as part of a color?
Problem: I tried running this code as part of a project I'm helping a friend with and when I try running the program my PSP crashes (yes I've checked if the .png's are interlaced or not(like the last time I had a prob like this))
PLZ HELP
EDIT: Sorry for the code formatting for some reason it's not coming in the spoiler the way it's supposed to.

Are you sure that's the code i gave you... I wrote mine in OSlib, and tested it, and it appears that in your attempt to convert it to graphics.h you kinda didn't see what was actually happening :P Try again, it's a good learning experience.btw, use code tags ([code])

[FigMan]

Replace "build.mak" with "build_prx.mak" in the Makefile.

thanks :)

[bnc9]

arghh.. still refuses to work I know I should have asked this question earlier but SG57:what is really going on in the code you gave me ?!?

[SG57]

lol I don't have the code i gave you stored, can you PM me it? I'll help you that way a little bit more :)

[Mr305]

What do Analog stick values range at?

For Lx & Ly

0 - 128(in centre) - 255

Correct?

[Archaemic]

I think 127 is the center.

But yeah, it's unsigned, so that is indeed the range.

[Commanderbob]

Hello, I am new to programming for the PSP and have started my own game but I want to add sound. Using the library in Lesson 06 of the tutorial (libmad, I think it was) made my game slow.

I want to use the player from this sample code. However when I try to compile the code I get

players/pspaudiolib.o: In function `audioOutpuBlocking':
pspaudiolib.c:(.text+0x80): undefined reference to `sceAudio_E0727056'
players/pspaudiolib.o: In function `pspReleaseAudio':
pspaudiolib.c:(.text+0xa0): undefined reference to `sceAudio_5C37C0AE'
players/pspaudiolib.o: In function `setFrequency':
pspaudiolib.c:(.text+0xb0): undefined reference to `sceAudio_38553111'
players/pspaudiolib.o: In function `pspAudioOutBlocking':
pspaudiolib.c:(.text+0xe8): undefined reference to `sceAudio_E0727056'
players/pspaudiolib.o: In function `AudioChannelThread':
pspaudiolib.c:(.text+0x190): undefined reference to `sceAudio_E0727056'
players/pspaudiolib.o: In function `pspAudioSetFrequency':
pspaudiolib.c:(.text+0x2fc): undefined reference to `sceAudio_5C37C0AE'
pspaudiolib.c:(.text+0x30c): undefined reference to `sceAudio_38553111'
players/pspaudiolib.o: In function `pspAudioEnd':
pspaudiolib.c:(.text+0x3f4): undefined reference to `sceAudio_5C37C0AE'
players/pspaudiolib.o: In function `pspAudioInit':
pspaudiolib.c:(.text+0x4f8): undefined reference to `sceAudio_5C37C0AE'
pspaudiolib.c:(.text+0x508): undefined reference to `sceAudio_38553111'
pspaudiolib.c:(.text+0x778): undefined reference to `sceAudio_5C37C0AE'
players/player.o: In function `audioOutput':
player.c:(.text+0x1c4): undefined reference to `sceAudio_E0727056'
players/player.o: In function `releaseAudio':
player.c:(.text+0x1e4): undefined reference to `sceAudio_5C37C0AE'
players/player.o: In function `setAudioFrequency':
player.c:(.text+0x1f4): undefined reference to `sceAudio_38553111'
/usr/local/pspdev/lib/gcc/psp/4.1.0/../../../../psp/lib/libFLAC.a(ogg_decoder_aspect.o): In function `FLAC__ogg_decoder_aspect_read_callback_wrapper':
ogg_decoder_aspect.c:(.text+0x160): undefined reference to `ogg_sync_buffer'
/usr/local/pspdev/lib/gcc/psp/4.1.0/../../../../psp/lib/libFLAC.a(ogg_decoder_aspect.o): In function `FLAC__ogg_decoder_aspect_finish':
ogg_decoder_aspect.c:(.text+0x33c): undefined reference to `ogg_sync_clear'
ogg_decoder_aspect.c:(.text+0x350): undefined reference to `ogg_stream_clear'
/usr/local/pspdev/lib/gcc/psp/4.1.0/../../../../psp/lib/libFLAC.a(ogg_decoder_aspect.o): In function `FLAC__ogg_decoder_aspect_init':
ogg_decoder_aspect.c:(.text+0x36c): undefined reference to `ogg_stream_init'
ogg_decoder_aspect.c:(.text+0x394): undefined reference to `ogg_sync_init'
collect2: ld returned 1 exit status
make: *** [softwareplayers.elf] Error 1

Any help? What causes this?
Thanks a lot,
Justin

[Archaemic]

Install libogg, and also add -lpspaudio to the LIBS line in your makefile.

[chrisp6825]

Hi. I am trying to start coding in c/c++...

I've finally got the toolchain and stuff setup to compile some stuff successfully.
I followed a short tutorial on writing a Hello World and it compiled and ran fine on the psp.
But I wanted to code in the 3.xx kernel instead of getting into the 1.5 kernel. So, I looked up how to do this and found this http://www.ghoti.nl/PSPtutorialm0.php.

I followed all the instructions and compiled fine, but it wont run on the psp. I'm thinking it's because of this...

int exit_callback(int arg1, int arg2, void *common) {
          sceKernelExitGame();
          return 0;
}

/* Callback thread */
int CallbackThread(SceSize args, void *argp) {
          int cbid;

          cbid = sceKernelCreateCallback("Exit Callback", exit_callback, NULL);
          sceKernelRegisterExitCallback(cbid);

          sceKernelSleepThreadCB();

          return 0;
}

/* Sets up the callback thread and returns its thread id */
int SetupCallbacks(void) {
          int thid = 0;

          thid = sceKernelCreateThread("update_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
          if(thid >= 0) {
                    sceKernelStartThread(thid, 0, 0);
          }

          return thid;
}

Won't having functions that deal with kernel not work in 3.xx?
What would I replace these functions with if this is whats causing the crash?

I'm sorry if this is a stupid question. This is my first time messing with c/c++.
I've been messing with lua, and I use to write Java a bunch (not for psp, for pc), but this is a bit different.

My source code is very simple and short, if this isn't the problem you could take a quick look at it.
main.c
Makefile

I appreciate any help.
Thanks!

[Archaemic]

Those are all usermode functions. They just call on the kernel to do something.

[SG57]

Describe what is happening chrisp, because if you are running that app in 3.xx kernel it should display "Hello World" and do nothing. You can press home and exit though...

[chrisp6825]

Describe what is happening chrisp, because if you are running that app in 3.xx kernel it should display "Hello World" and do nothing. You can press home and exit though...

Well, basically nothing is happening. I made the changes that it says to in that page, then I compiled it and stuck it in the GAME folder on my psp and it says the game can't be started. Before I changed it at all, it ran fine. I had it in the GAME folder and it still ran.
My psp is fat 3.71-4 m33 with 1.5 kernal 2 on 3.71 kernel.

I moved it to the GAME150 folder and it just freezes in the gameboot.

When I made those changes and compiled, it gave me a prx file, so... maybe I might have to put it in with the game too? I don't think it's the problem but I'll try it.

Edit -
No, it didn't fix it. Does this page say to do everything I need to do? Is it leaving anything out?

Thanks for the help guys.

[Mr305]

What is the Fastest way to check if a string has an ending "\n", if not add one?

I'm doing this:

if(text_lists[currprintnum][strlen(pb_text_lists[currprintnum])-1]!='\n')

Correct? :)

Or Am I supposed to use strcmp?

[Archaemic]

Well, basically nothing is happening. I made the changes that it says to in that page, then I compiled it and stuck it in the GAME folder on my psp and it says the game can't be started. Before I changed it at all, it ran fine. I had it in the GAME folder and it still ran.
My psp is fat 3.71-4 m33 with 1.5 kernal 2 on 3.71 kernel.

I moved it to the GAME150 folder and it just freezes in the gameboot.

When I made those changes and compiled, it gave me a prx file, so... maybe I might have to put it in with the game too? I don't think it's the problem but I'll try it.

Edit -
No, it didn't fix it. Does this page say to do everything I need to do? Is it leaving anything out?

Thanks for the help guys.

Can we see your Makefile?

[chrisp6825]

Can we see your Makefile?

Sure..

Spoiler for Makefile:

TARGET = hello
OBJS = main.o

CFLAGS = -O2 -G0 -Wall
CXXFLAGS = $(CFLAGS) -fno-exceptions -fno-rtti
ASFLAGS = $(CFLAGS)

EXTRA_TARGETS = EBOOT.PBP
PSP_EBOOT_TITLE = Hello World

BUILD_PRX = 1
PSP_FW_VERSION = 371

PSPSDK=$(shell psp-config --pspsdk-path)
include $(PSPSDK)/lib/build.mak

And heres the main.c just in case...

Spoiler for main.c:

// Hello World!

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

//PSP_MODULE_INFO("Hello World", 1, 1, 1);	//1.50 kernel
PSP_MODULE_INFO("Hello World", 0, 1, 1);		//3.xx kernel
PSP_HEAP_SIZE_KB(20480);				//3.xx kernel

/* Exit callback */
int exit_callback(int arg1, int arg2, void *common) {
          sceKernelExitGame();
          return 0;
}

/* Callback thread */
int CallbackThread(SceSize args, void *argp) {
          int cbid;

          cbid = sceKernelCreateCallback("Exit Callback", exit_callback, NULL);
          sceKernelRegisterExitCallback(cbid);

          sceKernelSleepThreadCB();

          return 0;
}

/* Sets up the callback thread and returns its thread id */
int SetupCallbacks(void) {
          int thid = 0;

          thid = sceKernelCreateThread("update_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
          if(thid >= 0) {
                    sceKernelStartThread(thid, 0, 0);
          }

          return thid;
}

//-------------------------------------------------------------------------------------

#define printf pspDebugScreenPrintf

int main() {
	pspDebugScreenInit();
	SetupCallbacks();
	
	printf("Hello World");
	
	sceKernelSleepThread();
	return 0;
}

[_df_]

What is the Fastest way to check if a string has an ending "\n", if not add one?

I'm doing this:

if(text_lists[currprintnum][strlen(pb_text_lists[currprintnum])-1]!='\n')

Correct? :)

Or Am I supposed to use strcmp?

no. that will fault if your string is ""...

try if(strchr(foo, '\n') != NULL)

[Commanderbob]

Install libogg, and also add -lpspaudio to the LIBS line in your makefile.

I installed libogg by following the directions here but I still get the same ogg errors. Also -lpspaudio is already there.
Thanks,
Justin