C/C++ Programming Help Thread

[Auraomega]

I'm aware of that, my concern is with the mipmaps having to load and create multiple textures (as is my understanding, one for each square under the image size, hence why mipmapped images actually work I believe?).

Saying that, if I pad out the images once loaded, and not as they are being loaded, the same process can be used on each image, irrespective of it being a bmp, jpg, png or some other obscure image format. I hadn't thought of that angle.

-Aura

[slicer4ever]

it would probably make life easier for supporting multiple image formats if you only had to worry about actually loading the image

[malliet]

Hey everybody. Can someone help me? I'm making something in C++ (just for myself, not a release) but I'm stuck. I have a mp3-player now but you have to put a music file named music.mp3 in the ms0:/music folder, but how can you let the player detect mp3 files automatically in a certain map or on the whole memory stick? This is my code (was included with in the psp/sdk folder, i'm just learning some things):

#include <pspkernel.h>
#include <pspdebug.h>
#include <pspctrl.h>
#include <pspdisplay.h>
#include <stdio.h>
#include <pspaudio.h>
#include <pspmp3.h>
#include <psputility.h>


PSP_MODULE_INFO("Mp3Test", 0, 0, 1);
PSP_MAIN_THREAD_ATTR(THREAD_ATTR_USER);
PSP_HEAP_SIZE_KB(-1024);

#define MP3FILE "ms0:/MUSIC/music.mp3"

#define printf  pspDebugScreenPrintf

static int isrunning = 1;

int exit_callback(int arg1, int arg2, void *common)
{
    isrunning = 0;

	return 0;
}

int CallbackThread(SceSize args, void *argp)
{
    int cbid;
    cbid = sceKernelCreateCallback("Exit Callback", exit_callback, NULL);
    sceKernelRegisterExitCallback(cbid);
    sceKernelSleepThreadCB();

	return 0;
}

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


char	mp3Buf[16*1024]  __attribute__((aligned(64)));
short	pcmBuf[16*(1152/2)]  __attribute__((aligned(64)));


#define ERRORMSG(...) { char msg[128]; sprintf(msg,__VA_ARGS__); error(msg); }

void error( char* msg )
{
	SceCtrlData pad;
	pspDebugScreenClear();
	pspDebugScreenSetXY(0, 0);
	printf(msg);
	printf("Press X to quit.\n");
	while (isrunning)
	{
		sceCtrlReadBufferPositive(&pad, 1);
		if (pad.Buttons & PSP_CTRL_CROSS)
			break;
		sceDisplayWaitVblankStart();
	}
	sceKernelExitGame();
}

int fillStreamBuffer( int fd, int handle )
{
	char* dst;
	int write;
	int pos;

	int status = sceMp3GetInfoToAddStreamData( handle, &dst, &write, &pos);
	if (status<0)
	{
		ERRORMSG("ERROR: sceMp3GetInfoToAddStreamData returned 0x%08X\n", status);
	}

	// Seek file to position requested
	status = sceIoLseek32( fd, pos, SEEK_SET );
	if (status<0)
	{
		ERRORMSG("ERROR: sceIoLseek32 returned 0x%08X\n", status);
	}

	// Read the amount of data
	int read = sceIoRead( fd, dst, write );
	if (read < 0)
	{
		ERRORMSG("ERROR: Could not read from file - 0x%08X\n", read);
	}

	if (read==0)
	{
		return 0;
	}

	status = sceMp3NotifyAddStreamData( handle, read );
	if (status<0)
	{
		ERRORMSG("ERROR: sceMp3NotifyAddStreamData returned 0x%08X\n", status);
	}

	return (pos>0);
}

int main(int argc, char *argv[])
{
    SceCtrlData pad;

    pspDebugScreenInit();
    pspDebugScreenClear();
    SetupCallbacks();

    sceCtrlSetSamplingCycle(0);
    sceCtrlSetSamplingMode(0);

	int status = sceUtilityLoadModule(PSP_MODULE_AV_AVCODEC);
	if (status<0)
	{
		ERRORMSG("ERROR: sceUtilityLoadModule(PSP_MODULE_AV_AVCODEC) returned 0x%08X\n", status);
	}

	status = sceUtilityLoadModule(PSP_MODULE_AV_MP3);
	if (status<0)
	{
		ERRORMSG("ERROR: sceUtilityLoadModule(PSP_MODULE_AV_MP3) returned 0x%08X\n", status);
	}

	int fd = sceIoOpen( MP3FILE, PSP_O_RDONLY, 0777 );
	if (fd<0)
	{
		ERRORMSG("ERROR: Could not open file '%s' - 0x%08X\n", MP3FILE, fd);
	}

	status = sceMp3InitResource();
	if (status<0)
	{
		ERRORMSG("ERROR: sceMp3InitResource returned 0x%08X\n", status);
	}

	SceMp3InitArg mp3Init;
	mp3Init.mp3StreamStart = 0;
	mp3Init.mp3StreamEnd = sceIoLseek32( fd, 0, SEEK_END );
	mp3Init.unk1 = 0;
	mp3Init.unk2 = 0;
	mp3Init.mp3Buf = mp3Buf;
	mp3Init.mp3BufSize = sizeof(mp3Buf);
	mp3Init.pcmBuf = pcmBuf;
	mp3Init.pcmBufSize = sizeof(pcmBuf);

	int handle = sceMp3ReserveMp3Handle( &mp3Init );
	if (handle<0)
	{
		ERRORMSG("ERROR: sceMp3ReserveMp3Handle returned 0x%08X\n", handle);
	}

	fillStreamBuffer( fd, handle );

	status = sceMp3Init( handle );
	if (status<0)
	{
		ERRORMSG("ERROR: sceMp3Init returned 0x%08X\n", status);
	}

	int channel = -1;
	int samplingRate = sceMp3GetSamplingRate( handle );
	int numChannels = sceMp3GetMp3ChannelNum( handle );
	int lastDecoded = 0;
	int volume = PSP_AUDIO_VOLUME_MAX;
	int numPlayed = 0;
	int paused = 0;
	int lastButtons = 0;
	int loop = 0;
	while (isrunning)
	{
		sceDisplayWaitVblankStart();
		pspDebugScreenSetXY(0, 0);
		printf("MP3-PSP By Malliet\n\n");
		printf("Playing '%s'...\n", MP3FILE);
		printf(" %i Hz\n", samplingRate);
		printf(" %i kbit/s\n", sceMp3GetBitRate( handle ));
		printf(" %s\n", numChannels==2?"Stereo":"Mono");
		printf(" %s\n\n", loop==0?"No loop":"Loop");
		int playTime = samplingRate>0?numPlayed / samplingRate:0;
		printf(" Playtime: %02i:%02i\n", playTime/60, playTime%60 );
		printf("\n\n\nPress CIRCLE to Pause/Resume playback\nPress TRIANGLE to reset playback\nPress CROSS to switch loop mode\nPress SQUARE to stop playback and quit\n");

		if (!paused)
		{
			if (sceMp3CheckStreamDataNeeded( handle )>0)
			{
				fillStreamBuffer( fd, handle );
			}

			short* buf;
			int bytesDecoded;
			int retries = 0;

			for (;retries<1;retries++)
			{
				bytesDecoded = sceMp3Decode( handle, &buf );
				if (bytesDecoded>0)
					break;

				if (sceMp3CheckStreamDataNeeded( handle )<=0)
					break;

				if (!fillStreamBuffer( fd, handle ))
				{
					numPlayed = 0;
				}
			}
			if (bytesDecoded<0 && bytesDecoded!=0x80671402)
			{
				ERRORMSG("ERROR: sceMp3Decode returned 0x%08X\n", bytesDecoded);
			}

			if (bytesDecoded==0 || bytesDecoded==0x80671402)
			{
				paused = 1;
				sceMp3ResetPlayPosition( handle );
				numPlayed = 0;
			}
			else
			{
				if (channel<0 || lastDecoded!=bytesDecoded)
				{
					if (channel>=0)
						sceAudioSRCChRelease();

					channel = sceAudioSRCChReserve( bytesDecoded/(2*numChannels), samplingRate, numChannels );
				}
				numPlayed += sceAudioSRCOutputBlocking( volume, buf );
			}
		}

		sceCtrlPeekBufferPositive(&pad, 1);

		if (pad.Buttons!=lastButtons)
		{
			if (pad.Buttons & PSP_CTRL_CIRCLE)
			{
				paused ^= 1;
			}

			if (pad.Buttons & PSP_CTRL_TRIANGLE)
			{
				sceMp3ResetPlayPosition( handle );
				numPlayed = 0;
			}

			if (pad.Buttons & PSP_CTRL_CROSS)
			{
				loop = (loop==0?-1:0);
				status = sceMp3SetLoopNum( handle, loop );
				if (status<0)
				{
					ERRORMSG("ERROR: sceMp3SetLoopNum returned 0x%08X\n", status);
				}
			}

			if (pad.Buttons & PSP_CTRL_SQUARE)
			{
				break;
			}

			lastButtons = pad.Buttons;
		}
    }

    if (channel>=0)
		sceAudioSRCChRelease();

	status = sceMp3ReleaseMp3Handle( handle );
	if (status<0)
	{
		ERRORMSG("ERROR: sceMp3ReleaseMp3Handle returned 0x%08X\n", status);
	}

	status = sceMp3TermResource();
	if (status<0)
	{
		ERRORMSG("ERROR: sceMp3TermResource returned 0x%08X\n", status);
	}

	status = sceIoClose( fd );
	if (status<0)
	{
		ERRORMSG("ERROR: sceIoClose returned 0x%08X\n", status);
	}

    sceKernelExitGame();

    return 0;
}

[Davee]

sceIoD* functions.

Use them to read a folder or whatever and get the files within.

[malliet]

I'm a beginner in C++ Davee so can you explain me how to use that function.

[Auraomega]

If you do a search on ps2dev's forums for dirents, you'll probably find a good example of a file browser, but instead of printing a list of files, simply feed them into a loop to check extentions and play.

//Psudo

typedef struct
{
   int count;
   char loc[256];
} _fileBrowser fileBrowser;

getFileList(fileBrowser);

for(int loop = 0; loop < fileBrowser.count; loop++)
{
   //code to check extention is mp3
   if(extention == mp3)
   {
      //play mp3 file
   }
   else
   {
      // check again
   }
}

Of course, theres more work than that, but it should give you a starting point.

-Aura

[malliet]

I shall check the ps2dev's forum then:P But thanks for giving me a starting point;)

[slasher101]

ive compiled my idstorage.prx but i wanna know how to access and use the functions in it, any advice would help =D

!~SlasheR~!

[Auraomega]

Build a stub file. You've created your exports right? In bash type psp-build-exports -s [export file] and you'll recieve a stub file.

Then, all you need to do is link your stub file into the makefile of your app and you SHOULD be able to call all those functions. You'll need to make sure you've started all the modules which are required (such as the module in question and any the functions are dependant on). If you get any errors check the SDK documentation under PSP_KERNEL_ERRORS (I think) and see if you can make sense of it, if not post back.

-Aura

[malliet]

Never mind. It works now

[Xsjado7]

We can't help you if we don't know whats going wrong ;)

Edit:

Seriously, you should be smart enough to figure that out. I'm not going to tell you whats wrong. It tells you EXACTLY whats not right and gives you a line reference.

[slasher101]

thx 4 replying but i cant figure out how to link it into my makefile

i ran psp-build-exports -s test.exp and got test.S

now how do i link that?

srry if i sound nooby but im just a begginer

!~SlasheR~!

[NoEffex]

You put the test.o in your makefile and make a test.h as a header for the functions.

[slasher101]

no i want to link "test.S" into my MakeFile

[Davee]

no i want to link "test.S" into my MakeFile

As NoEffex said, add test.o to your objects line in the MakeFile ;)

[slasher101]

i did and

 $ make
psp-gcc -I. -IC:/PSP/pspdev/psp/sdk/include -O2 -G0 -Wall -lpsppower  -L. -LC:/PSP/pspdev/psp/sdk/li
b   main.o prx\\main.o -lpsppower -lpspwlan -lpspnand_driver -lpspgu -lpng -lz -lm -lpspdebug -lpspd
isplay -lpspge -lpspctrl -lpspsdk -lc -lpspnet -lpspnet_inet -lpspnet_apctl -lpspnet_resolver -lpspu
tility -lpspuser -lpspkernel -o hello.elf
prx\main.o:(.rodata.sceModuleInfo+0x0): multiple definition of `module_info'
main.o:(.rodata.sceModuleInfo+0x0): first defined here
main.o: In function `check_mobo':
main.c:(.text+0x58): undefined reference to `ReadKey'
main.c:(.text+0x68): undefined reference to `ReadKey'
collect2: ld returned 1 exit status
make: *** [hello.elf] Error 1

:Argh:



--EDIT--

Fixed =) didnt know you had 2 have test.S in the same dir
-=Double Post Merge =-
srry that worked but how do i reference them

do i do:

int ReadKey();

or:

extern int ReadKey();

thanks for all your helpl so far

!~SlasheR~!

[malliet]

Does somebody know where I can find the UMD functions such as starting the umd etc?

[Insert_Witty_Name]

pspumd.h

[malliet]

yeah i already found that out, but thanks anyway. Btw that's the include right? So how can i start umd etc. If i press on a button?

EDIT: Never mind; found it here: http://psp.jim.sh/pspsdk-doc/

[eldiablov]

Reading the header will tell you everything you need to know ...

[NEW09]

Help what m i doing wrong with this collision code

#include <stdio.h>
#include <oslib/oslib.h>
#include <math.h>




//necessary to create eboot
psp_module_info("oslib sample", 0, 1, 1);
psp_main_thread_attr(thre ad_attr_user | thread_attr_vfpu);

//declaration of the pointers of our images
osl_image *background,*a,*b;



// based of ravines
int collision(int ax, int ay, int awidth, int aheight, int bx, int by, int bwidth, int bheight)


int hit(){

if ((ax >= bx && ax <= (bx+bwidth)) && (ay >= by && ay <= (by+bheight)))
{
hit = 1;
}

if (((ax+awidth) >= bx && (ax+awidth) <= (bx+bwidth)) && (ay >= by && ay <= (by+bheight))) {
hit = 1;
}

if ((ax >= bx && ax <= (bx+bwidth)) && ((ay+aheight) >= by && (ay+aheight) <= (by+bheight))) {
hit = 1;
}

if (((ax+awidth) >= bx && (ax+awidth) <= (bx+bwidth)) && ((ay+aheight) >= by && (ay+aheight) <= (by+bheight))) {
hit = 1;
}

return hit;
}


int main(int argc, char **argv)
{
//initialization of the oslib library
oslinit(0);

//initialization of the graphics mode
oslinitgfx(osl_pf_8888, 1);

oslinitconsole(); //text

oslsettransparentcolor(rg b(255,0,255));

//loads our images into memory
a = oslloadimagefile("a.png", osl_in_ram, osl_pf_5551);
b = oslloadimagefile("b.png", osl_in_ram, osl_pf_5551);
background = oslloadimagefile("backgro und.png", osl_in_ram, osl_pf_5551);

//stuff

a->x =ax;
a->y =ay;
b->x =bx;
b->y =by;



//position
a->x =100;
a->y =249;

b->x=300;
b->y=245;

//main while loop
while (!osl_quit)
{
//to be able to draw on the screen
oslstartdrawing();

//clear the screen
oslcls();

//initiate the psp's buttons
oslreadkeys();
osldrawimage(background);
osldrawimage(a);
osldrawimage(b);
if(hit==1)oslprintf_xy(10 ,10,"collision is positive");
if(hit==0)oslprintf_xy(30 0,10,"collision is negative");
if(osl_keys->held.right) a->x+=1;
if(osl_keys->held.left) a->x-=1;
if(osl_keys->held.up) a->y-=1;
if(osl_keys->held.down) a->y+=1;

//ends drawing mode
oslenddrawing();

//synchronizes the screen
oslsyncframe();
}
//terminate the program
oslendgfx();
oslquit();
return 0;
}

[slicer4ever]

Help what m i doing wrong with this collision code

Spoiler for code:

[code]

//prototype here
int collision(int ax, int ay, int awidth, int aheight, int bx, int by, int bwidth, int bheight)

//int hit(){ here?!
int hit(){

//take out the last two lines and do:

int collision(int ax, int ay, int awidth, int aheight, int bx, int by, int bwidth, int bheight){
int hit=0;
if ((ax >= bx && ax <= (bx+bwidth)) && (ay >= by && ay <= (by+bheight)))
{
hit = 1;
}

if (((ax+awidth) >= bx && (ax+awidth) <= (bx+bwidth)) && (ay >= by && ay <= (by+bheight))) {
hit = 1;
}

if ((ax >= bx && ax <= (bx+bwidth)) && ((ay+aheight) >= by && (ay+aheight) <= (by+bheight))) {
hit = 1;
}

if (((ax+awidth) >= bx && (ax+awidth) <= (bx+bwidth)) && ((ay+aheight) >= by && (ay+aheight) <= (by+bheight))) {
hit = 1;
}

return hit;
}

[NEW09]

still no use...
i get this from the debugger.

[slicer4ever]

well, from looking at your code above, and the error's your getting, your forgetting that c++ is case sensitive...

anywho, i'm heading off to bed

[NEW09]

that happended when i pasted it here.the cases changed, must have had capslock on or something.

OK I GOT IT TO COMPLIE..BUT STILL NO COLLISION..Y Y Y Y Y Y ?????

#include <stdio.h>
#include <oslib/oslib.h>
#include <math.h>




//Necessary to create eboot
PSP_MODULE_INFO("OSLib Sample", 0, 1, 1);
PSP_MAIN_THREAD_ATTR(THRE AD_ATTR_USER | THREAD_ATTR_VFPU);

//declaration of the pointers of our images
OSL_IMAGE *background,*A,*B;

int collided;
int hit;
int Ax=100, Ay = 100, Awidth = 32, Aheight = 32, Bx = 200, By = 100, Bwidth = 32, Bheight = 32;



int collision(int Ax, int Ay, int Awidth, int Aheight, int Bx, int By, int Bwidth, int Bheight){

int hit=0;

if ((Ax >= Bx && Ax <= (Bx+Bwidth)) && (Ay >= By && Ay <= (By+Bheight)))
{
hit = 1;
}

if (((Ax+Awidth) >= Bx && (Ax+Awidth) <= (Bx+Bwidth)) && (Ay >= By && Ay <= (By+Bheight))) {
hit = 1;
}

if ((Ax >= Bx && Ax <= (Bx+Bwidth)) && ((Ay+Aheight) >= By && (Ay+Aheight) <= (By+Bheight))) {
hit = 1;
}

if (((Ax+Awidth) >= Bx && (Ax+Awidth) <= (Bx+Bwidth)) && ((Ay+Aheight) >= By && (Ay+Aheight) <= (By+Bheight))) {
hit = 1;
}

return hit;
}


int main(int argc, char **argv)
{
//Initialization of the Oslib library
oslInit(0);

//Initialization of the graphics mode
oslInitGfx(OSL_PF_8888, 1);

oslInitConsole(); //Text

oslSetTransparentColor(RG B(255,0,255));

//loads our images into memory
A = oslLoadImageFile("A.png", OSL_IN_RAM, OSL_PF_5551);
B = oslLoadImageFile("B.png", OSL_IN_RAM, OSL_PF_5551);
background = oslLoadImageFile("backgro und.png", OSL_IN_RAM, OSL_PF_5551);

//stuff

A->x =Ax;
A->y =Ay;
B->x =Bx;
B->y =By;



//position
A->x =100;
A->y =100;

B->x=200;
B->y=100;

//main while loop
while (!osl_quit)
{
//To be able to draw on the screen
oslStartDrawing();

//Clear the screen
oslCls();

//initiate the PSP's buttons
oslReadKeys();
oslDrawImage(background);
oslDrawImage(A);
oslDrawImage(B);
if(hit==1)oslPrintf_xy(10 ,10,"collision is positive");

if(collision(Ax, Ay, Awidth, Aheight, Bx, By, Bwidth, Bheight)) {
collided = 1;}

if(collided==1) {
oslPrintf_xy(10,30,"colli sion is +");}

if(osl_keys->held.right) A->x+=1;
if(osl_keys->held.left) A->x-=1;
if(osl_keys->held.up) A->y-=1;
if(osl_keys->held.down) A->y+=1;

//Ends drawing mode
oslEndDrawing();

//Synchronizes the screen
oslSyncFrame();
}
//Terminate the program
oslEndGfx();
oslQuit();
return 0;
}

[malliet]

Does somebody know how to automatically detect mp3 files on the mem stick or a map and display a list with the mp3 files?

[kuroneko]

OK I GOT IT TO COMPLIE..BUT STILL NO COLLISION..Y Y Y Y Y Y ?????

What do you expect? You effectively call the collision function with constants. You probably want to pass in A->x, A->y, and B->x, B->y as the object locations.

Also, the collision function looks a bit convoluted. You should only need 4 equations:

hit = (ax+aw >= bx) && (ay+ah >= by) && (bx+bw >= ax) && (by+bh >= ay)

HTH

[Xsjado7]

sceIoD* functions.

Use them to read a folder or whatever and get the files within.

Does somebody know how to automatically detect mp3 files on the mem stick or a map and display a list with the mp3 files?

http://psp.jim.sh/pspsdk-doc/pspiofilemgr_8h.html ;)

[slasher101]

from prx?

extern int ReadKey();

or

int ReadKey();

plz help !~SlasheR~!

[slicer4ever]

@malliet:
look into the dirent.h library, should be what you need

@slasher:
test both ways and see, don't ask until you've tested