C/C++ Programming Help Thread

[Anti-QuickJay]

Anti-QJ, use psplink. It's not an emulator but you can use it to load your programs on your psp from your pc's terminal window via USB or wifi no copying over to the psp necessary.

svn co svn://svn.ps2dev.org/psp/trunk/psplink

Thanks dude!

[SG57]

Insomniac - That was what I was planning on doing as my theory. I need to project my texture over enough triangles, to the point where each one is smalelr than a pixel on screen, that way when they do get culled, it won't show as the one next to it is in it's place and showing hte texture as it should. I just need a method of projecting the texture over a lot of triangles. I remember i asked this as ps2dev a way while back, so ill check there in the morning, Til then, im off to bed as i have school tomorrow, and homework i need to do during school

Also, after placing a simple cube that would resemble a person in my little world, the sky box is HUGE... With nothing else but it there, it doesnt seem to big, rather that your walking slow. But after placing a cube in there, i saw just how big it is... I say I could fit a nice little maze within it. Once that is done, ill start with heightmapping and collision on all 3 axis (right now i just substitute the Y axis as the Z, with a few tweaks so it turns out right...)

[Insert_Witty_Name]

I wouldn't make your triangles that small.

Just tesselate your mesh until you get a decent result.

Good luck with the 3D collision.

By the way, sky dome > sky box ;)

[hallo007]

sill not working

  sceIoLseek(in, tmp->psar, SEEK_SET); 
  sceIoRead(in, checkextension , 4);

  if( strcmp (checkextension,"PSAR") == 0)
  {

if( strcmp (checkextension,"PSAR") == 0) is still false

mayby the fault is here sceIoRead(in, checkextension , 4);
what it needs to do , reading the offset and stores the first 4 bytes in checkextension , that 4bytes need to be PSAR

[SG57]

hallo - extensions usually start with '.'. Maybe it's returning false because your comparing '.PSA' with 'PSAR'.

Insomniac - Sky dome is better, but I dont want to mess with spheres until I know I will get a decent framerate (i havent hte slightest clue whether or not a cube takes less CPU than a sphere when creating/rendering, but seeing as how a sphere must have ALOT of verticies, Im guessing the cube is less of a hassle with the CPU.. Please correct me if im guessing wrong).

Oh and I think you mean 'tessellate' ;) And I know i can make alot of small squares make up a wall, but hte problem is that I need to than project my texture over them. To do this, Im thinking of using offsets of the texture per square. Im looking into it now as we speak. Once thats done, ill apply collision, than make a start and finish with their appropriate collision and whatnot. Than, ill start my map structure...
-= Double Post =-
Ok, i know how to do it. When setting the UV coordinates, its as if im setting offests. Now itll be very easy to do.
-= Double Post =-
Is anyone on right now, that has some knowledge of using a 3D API? I have a few questions, one thing new I learned is setting a textures envirorment parameter to GL_DECAL, rather than GL_MODULATE, it will prevent any lighting and/or coloring done to the texture, this was currently a problem as whenever I drew ANYTHING, be it a cube or my gridded ground, id get a colored sky box, now it's just peachy.

But, im still having trouble with culling. Setting my near-z value in my perspective to a greater amount, certainly has helped (now the grided floor shows, but not both ses of lines all the time. I have a question though, setting it any higher (right now it's 2.0f, the default (my regular usage) is 0.1f) make it worse? Also, if someone is on (Raphael, Insomniac, yaustar, etc.) is there anyway i can talk to you via instant messenger? Be it, IRC, MSN, Aim or some other type of messenger? Thatd be great :o Im still a novice at 3D programming, but Im moving, slowly but surely.

[Insert_Witty_Name]

You can increase it past that, but it's never going to be a complete way of avoiding the clipping.

Subdivision (whether it be lines, triangles or whatever) combined with increasing the near plane is a decent way of doing it.

I've PM'd you my AIM, I'll be home from work in less than an hour.

[Raphael]

@hallo007: That's because you do something very bad and that is writing to unallocated memory:

  char *checkextension;
  ...
  sceIoLseek(in, tmp->psar, SEEK_SET); //zoeken naar data.spar in eboot 
  sceIoRead(in, checkextension , 4);
 
  if( strcmp (checkextension,"PSAR") != 0)//als er een dat.spar is
  {

Make that first line THIS instead:

char checkextension[5];
checkextension[4]=0;

@SG57: You NEED to tesselate/subdivide your faces on PSP to avoid unwanted culling. There was a very good thread on PS2dev where someone explained the exact reason for the PSP to act like that. Also, you can reach me via ICQ most of the time (just not this week, because I'm not at home).
Also, regarding your texture modes, try GL_REPLACE if you want to completely avoid any mixing of the texture with the background. GL_DECAL is another apply mode that still blends in the current fragment (vertex) color when the color mode is GL_RGBA. GL_DECAL == GL_REPLACE for GL_RGB though.
Read here for a complete specification of the modes (it's for openGL-ES actually, but it's the same for standard openGL).

[1337PSPer]

ok i have just gone back to realy basic code to re freash my memery and i can work out why this simple code doesn't work.

#include <pspkernel.h>
#include <pspdebug.h>
PSP_MODULE_INFO("CONVERTER", 0, 1, 1);
#define printf pspDebugScreenPrintf
/* 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;
}

int dec1 = 234;
int bin1 = 0;

#define RGB(r, g, b) ((r)|((g)<<8)|((b)<<16));

int main() {
pspDebugScreenInit();
SetupCallbacks();

if (dec1 > 255) {
pspDebugScreenPrintf("ERROR ");
}

if (dec1 < 0) {
pspDebugScreenPrintf("ERROR ");
}

if (dec1 >= 128) {
bin1 = 10000000;
dec1 = (dec1 - 128);
}

if (dec1 >= 64) {
bin1 = 1000000;
dec1 = (dec1 - 64);
}

if (dec1 >= 32) {
bin1 = 100000;
dec1 = (dec1 - 32);
}

if (dec1 >= 16) {
bin1 = 10000;
dec1 = (dec1 - 16);
}

if (dec1 >= 8) {
bin1 = 1000;
dec1 = (dec1 - 8);
}


if (dec1 >= 4) {
bin1 = 100;
dec1 = (dec1 - 4);
}

if (dec1 >= 2) {
bin1 = 10;
dec1 = (dec1 - 2);
}

if (dec1 >= 1) {
bin1 = 1;
dec1 = (dec1 - 1);
}




printf(bin1);
printf(dec1);


sceKernelSleepThread();

return 0;
}

[MaTiAz]

mafia1ft: It's because printf requires a char variable, and you're giving it an int. Try printf("%i", bin1); instead of printf(bin1);.

[Raphael]

PS: If you're supposing to print the binary representation of a number with that, then you're off. It will only print the least significant one-bit. If you want the real binary, use bin1+=.
Also, there are more elegant ways to get done what you want :P Try using a loop and use shifts.

[hallo007]

@hallo007: That's because you do something very bad and that is writing to unallocated memory:

  char *checkextension;
  ...
  sceIoLseek(in, tmp->psar, SEEK_SET); //zoeken naar data.spar in eboot 
  sceIoRead(in, checkextension , 4);
 
  if( strcmp (checkextension,"PSAR") != 0)//als er een dat.spar is
  {

Make that first line THIS instead:

char checkextension[5];
checkextension[4]=0;

@SG57: You NEED to tesselate/subdivide your faces on PSP to avoid unwanted culling. There was a very good thread on PS2dev where someone explained the exact reason for the PSP to act like that. Also, you can reach me via ICQ most of the time (just not this week, because I'm not at home).
Also, regarding your texture modes, try GL_REPLACE if you want to completely avoid any mixing of the texture with the background. GL_DECAL is another apply mode that still blends in the current fragment (vertex) color when the color mode is GL_RGBA. GL_DECAL == GL_REPLACE for GL_RGB though.
Read here for a complete specification of the modes (it's for openGL-ES actually, but it's the same for standard openGL).

thnx
but it is possible that ps2dev.org is down because i need to reinstall cygwin and he cant connect to the server

[Raphael]

Yes, ps2dev is down. Cygwin itself doesn't require ps2dev though, so I suppose you mean that you need to install the pspsdk :P

[hallo007]

yeah , thats a big prob ,dam:P
-= Double Post =-
wow , see this

Your group is currently "mkpasswd".  This indicates that
the /etc/passwd (and possibly /etc/group) files should be rebuilt.
See the man pages for mkpasswd and mkgroup then, for example, run
mkpasswd -l [-d] > /etc/passwd
mkgroup  -l [-d] > /etc/group
Note that the -d switch is necessary for domain users.

what do i need to do?

[1337PSPer]

ok i have a number that changes in how many digits are in it but nerver over 8 is that a way i can have it always display as a 8 digit number. put have 0 at the front ?

[hallo007]

if(digit<10)
{
printf("0000000%i",digit);
}
else if(digit>100 && digit >=10)
{
printf("000000%i",digit);
}
.....

[Insert_Witty_Name]

ok i have a number that changes in how many digits are in it but nerver over 8 is that a way i can have it always display as a 8 digit number. put have 0 at the front ?

printf("%08d", theNumber);

[hallo007]

nice dindt knew that function




anyway still not fixed

Your group is currently "mkpasswd".  This indicates that
the /etc/passwd (and possibly /etc/group) files should be rebuilt.
See the man pages for mkpasswd and mkgroup then, for example, run
mkpasswd -l [-d] > /etc/passwd
mkgroup  -l [-d] > /etc/group
Note that the -d switch is necessary for domain users.

shows when cygwin start ups

[psphacker12.]

What header file do I need to include to use sceSyscon functions ?

[Insert_Witty_Name]

pspsyscon.h

Would it have been that hard to look through your include directory, browse the documentation or even taken a wild guess?

[psphacker12.]

pspsyscon.h

Would it have been that hard to look through your include directory, browse the documentation or even taken a wild guess?

"error: pspsyscon.h: No such file or directory"
I can't find that file in my include dir, can you upload pspsyscon.h?

[Insert_Witty_Name]

It'd be no use on it's own.

This is why you should install the toolchain yourself and not use one of those pre-packaged binary setups, you're stuck with whatever revision the setup has.

If you have installed the toolchain yourself, then update it.

[psphacker12.]

WTF
$ make
make: *** No rule to make target `CFLAGS', needed by `gShell.elf'. Stop.
Makefile :

Spoiler for Makefile:

TARGET = gShell
OBJS = main.o \
flib.o \
framebuffer.o \
graphics.o \
filebrowser.o \
oggplayer.o \
mp3player.o \
gfx.o \
plasma.o \
CFLAGS = -O2 -G0 -Wall
CXXFLAGS = $(CFLAGS) -fno-exceptions -fno-rtti
ASFLAGS = $(CFLAGS)
LIBS = -lpspctrl -lpspgu -lfreetype -lmad -lpspaudiolib -lpspaudio -lpsppower -lpspumd -lpng -lpsprtc -lpspusb -lpspusbstor -lz -lm -lvorbisidec
PSP_EBOOT_TITLE = gShell
EXTRA_TARGETS = EBOOT.PBP
PSPSDK=$(shell psp-config --pspsdk-path)
include $(PSPSDK)/lib/build.mak

[SG57]

psp - Are you aware of what hte '\' character is for? *smacks head*

Remove the '\' after plasma.o
-= Double Post =-
Rahpael - Id like to talk to you sometime, I dont have an ICQ #, but Ill make one. Insoniac helped my problem last night, it was a beginners mistake, I was setting the right texture offsets, but I forgot to apply them to the verticies as well (so it'd translate the vertex to make up 1/256 of the square).

Im just starting to mess around with it so it displays right, as of now its awfully slow and doesnt display correctly. Im working on it though.

P.S. Im 'honored' to know I can talk to you directly, instantly for a change :o

[psphacker12.]

now it gives me a bunch of crap when I remove the \

Spoiler for Error:

$ make
/usr/bin/psp-ld -T tiffsdk.x -L/usr/psp/sdk/lib main.o gfx.o tiffsdk.o -o main.e
lf
main.o: In function `InitGlobals':
main.c:(.text+0x14): relocation truncated to fit: R_MIPS_GPREL16 against `plasma
_frequency'
main.c:(.text+0x1c): relocation truncated to fit: R_MIPS_GPREL16 against `plasma
_wav_amp'
main.c:(.text+0x2c): relocation truncated to fit: R_MIPS_GPREL16 against `sp1'
main.c:(.text+0x34): relocation truncated to fit: R_MIPS_GPREL16 against `sp2'
main.c:(.text+0x3c): relocation truncated to fit: R_MIPS_GPREL16 against `sp3'
main.c:(.text+0x44): relocation truncated to fit: R_MIPS_GPREL16 against `sp4'
main.c:(.text+0x48): relocation truncated to fit: R_MIPS_GPREL16 against `.sbss'

main.c:(.text+0x4c): relocation truncated to fit: R_MIPS_GPREL16 against `.sbss'

main.c:(.text+0x50): relocation truncated to fit: R_MIPS_GPREL16 against `.sbss'

main.c:(.text+0x54): relocation truncated to fit: R_MIPS_GPREL16 against `.sbss'

main.c:(.text+0x58): additional relocation overflows omitted from the output
make: *** [main] Error 1

[SG57]

Well, that 'crap' is your poor programming skills in action (or copy paste job ;)). My best guess is that your trying to compile that plasma demo someone made over at psp-programming, or some variation of it, and not linking the correct libraries needed on the LIBS line.

Raphael & Insomniac [& yaustar] - This gives me a slow, dark green (from cube i drew after it ) blob it looks like. Im sure it is theh sky box, but doesnt have hte texture and doesnt look right as it is dark green, even with GL_DECAL or GL_REPLACE....

void Draw_Skybox(float x, float y, float z, float width, float height, float length)
{
	// Center the Skybox around the given x,y,z position
	height += 4;
	width += 4;
	length += 4;
	
	glTranslatef(x - width  / 2,y - height / 2,z - length / 2); // center
	
	// Center the Skybox around the given x,y,z position
	x = x - width  / 2;
	y = y - height / 2 + 30;
	z = z - length / 2;
 
     glScalef(width,height,length); // scale to size
     
     for(i=0;i<256;i+=5) {
       for(j=0;j<256;j+=5) {
     	// Draw Front side
     	glBindTexture(GL_TEXTURE_2D, SkyboxTexture[SKYFRONT]);
     	glBegin(GL_QUADS);	
     		glTexCoord2f(STEP*i, 0.0f); glVertex3f(0,		  0,		1.0f);
     		glTexCoord2f(STEP*i, STEP*j); glVertex3f(0,		  STEP*j, 1.0f);
     		glTexCoord2f(0.0f, STEP*j); glVertex3f(STEP*i, STEP*j, 1.0f); 
     		glTexCoord2f(0.0f, 0.0f); glVertex3f(STEP*i, 0,		1.0f);
     	glEnd();
     
     	// Draw Back side
     	glBindTexture(GL_TEXTURE_2D, SkyboxTexture[SKYBACK]);
     	glBegin(GL_QUADS);		
     		glTexCoord2f(STEP*i, 0.0f); glVertex3f(STEP*i, 0.0f,		0.0f);
     		glTexCoord2f(STEP*i, STEP*j); glVertex3f(STEP*i, STEP*j, 0.0f); 
     		glTexCoord2f(0.0f, STEP*j); glVertex3f(0.0f,		  STEP*j,	0.0f);
     		glTexCoord2f(0.0f, 0.0f); glVertex3f(0.0f,		  0.0f,		0.0f);
     	glEnd();
     
     	// Draw Left side
     	glBindTexture(GL_TEXTURE_2D, SkyboxTexture[SKYLEFT]);
     	glBegin(GL_QUADS);		
     		glTexCoord2f(STEP*i, STEP*j); glVertex3f(0.0f,		  STEP*i,	0);	
     		glTexCoord2f(0.0f, STEP*j); glVertex3f(0.0f,		  STEP*i,	STEP*j); 
     		glTexCoord2f(0.0f, 0.0f); glVertex3f(0.0f,		  0.0f,		STEP*j);
     		glTexCoord2f(STEP*i, 0.0f); glVertex3f(0.0f,		  0.0f,		0.0f);		
     	glEnd();
     
     	// Draw Right side
     	glBindTexture(GL_TEXTURE_2D, SkyboxTexture[SKYRIGHT]);
     	glBegin(GL_QUADS);
     		glTexCoord2f(STEP*i, STEP*j); glVertex3f(1.0f, 0.0f,		0.0f);
     		glTexCoord2f(0.0f, STEP*j); glVertex3f(1.0f, 0,		STEP*j);
     		glTexCoord2f(0.0f, 0.0f); glVertex3f(1.0f, STEP*i,	STEP*j); 
     		glTexCoord2f(STEP*i, 0.0f); glVertex3f(1.0f, STEP*i,	0.0f);
     	glEnd();
     
     	// Draw Up side
     	glBindTexture(GL_TEXTURE_2D, SkyboxTexture[SKYUP]);
     	glBegin(GL_QUADS);		
     		glTexCoord2f(0.0f, 0.0f); glVertex3f(STEP*i, 1.0f, 0.0f);
     		glTexCoord2f(STEP*i, 0.0f); glVertex3f(STEP*i, 1.0f, STEP*j); 
     		glTexCoord2f(STEP*i, STEP*j); glVertex3f(0.0f,		  1.0f,	STEP*j);
     		glTexCoord2f(0.0f, STEP*j); glVertex3f(0.0f,		  1.0f,	0.0f);
     	glEnd();
     
     	// Draw Down side
     	glBindTexture(GL_TEXTURE_2D, SkyboxTexture[SKYDOWN]);
     	glScalef(width,height,length); // scale to size
     	glBegin(GL_QUADS);		
     		glTexCoord2f(0.0f, 0.0f); glVertex3f(0.0f,		  0.0f,		0.0f);
     		glTexCoord2f(STEP*i, 0.0f); glVertex3f(0.0f,		 0.0f,		STEP*j);
     		glTexCoord2f(STEP*i, STEP*j); glVertex3f(STEP*i, 0.0f,		STEP*j); 
     		glTexCoord2f(0.0f, STEP*j); glVertex3f(STEP*i, 0.0f,		0.0f);
     	glEnd();
       }
     }
     glDisable(GL_TEXTURE_2D);
}

Im thinking of getting rid of the scaling, along with translation call in the function, and using the verticies points for where to place them, and to 'scale' them (i wont actually scale htem, rather just build the sky box the size it is, without scaling a 1x1x1 cube).

[Atin]

I'm having a problem running the toolchain.sh file when setting up the toolchain. Here's a screenshot of it:

[Xylem]

Atin, some guy just posted this thread:
http://forums.qj.net/f-psp-developme...ead-95565.html

Try posting it there, he may be able to help. I personally don't know much about this, since i myself haven't completely installed cygwin yet.

[SG57]

That guy is super, and he totally disregarded a largely spread rule, *Search*.

Cygwin Help Thread

AS for your problem Atin, I had the same problme a long time ago, I made a tutorial on how to do it with that error, it ended up with me downloading whatever link to the file it was trying to get. There's 3 in total; binutils,newlib and gcc i believe...

[Atin]

Thanks that's exactly what I needed.

[SG57]

All with the same or nearly hte same problem as Atin, check my newly created thread here, or go here:

http://www.psp-programming.com/forum...php?topic=1178