C/C++ Programming Help Thread

[hallo007]

thats an explenation (y)

thnx yaustar
I ported it:

                  if(fileList[loop].size() > 10)
                  {
                                     fileBuffer[loop].clear(); 
                                     fileBuffer[loop].append( fileList[loop], 0 , 10);
                                     fileBuffer[loop].append( 2, '.' );
                                     }

[Archaemic]

Something tells me that's not going to work very well. Maybe it's the clearing and then appending itself with itself (even though it's empty). I dunno.

[hallo007]

dude
fileBuffer[loop].append( fileList[loop], 0 , 10);

they are two differnt variabels

[Archaemic]

...oh.
I feel stupid now.

[slicer4ever]

ok i'm trying to add a multi array to my function yest i'm unsure how i've been trying:

object update(float** object_vertex_array,int max_vertexs,int frame_to){
object update(float **object_vertex_array,int max_vertexs,int frame_to){
object update(float *object_vertex_array[],int max_vertexs,int frame_to){
object update(float *object_vertex_array,int max_vertexs,int frame_to){

yet for the first 3 i always get the following error:

./main.cpp: In function 'int main(int, char**)':
./main.cpp:61: error: cannot convert 'float (*)[3]' to 'float**' for argument '1
' to 'object update(float**, int, int)'
make: *** [main.o] Error 1

and i call it like:

test_object_float[0][1]=0.0f;
test_object_float[0][2]=1.0f;
test_object_float[0][3]=0.0f;

test_object_float[1][1]=1.0f;
test_object_float[1][2]=-1.0f;
test_object_float[1][3]=0.0f;

test_object_float[2][1]=-1.0f;
test_object_float[2][2]=-1.0f;
test_object_float[2][3]=0.0f;

test_object = update(test_object_float, numOfTriangles,1);
test_object = update(test_object_float[3],numOfTriangles,1);

the second way gives me the following error:
./main.cpp: In function 'int main(int, char**)':
./main.cpp:61: error: cannot convert 'float*' to 'float**' for argument '1' to '
object update(float**, int, int)'

[yaustar]

*ick* Now we start running into problems

#include <stdio.h>

void aFunction( float * anArray )
{
	printf( "%f\n", anArray[0] ); // same as [0][0]
	printf( "%f\n", anArray[3] ); // same as [1][0]
}

int main(int argc, char* argv[])
{
	float blah[3][3] = {	{ 0.0f, 1.0f, 2.0f},
	{ 3.0f, 4.0f, 5.0f	},
	{ 6.0f, 7.0f, 8.0f }}	;

	float * apBLah = (float *)(blah);

	aFunction( apBLah );

	return 0;
}

Note: This is dangerous and possibly undefined behaviour.

[slicer4ever]

thxs yaustar but i still get this error:

/main.o
./main.cpp: In function 'int main(int, char**)':
./main.cpp:62: error: cannot convert 'float*' to 'float**' for argument '1' to '
object update(float**, int, int)'
./functions/update_object.txt: In function 'object update(float*, int, int)':
./functions/update_object.txt:8: error: invalid types 'float[int]' for array sub
script
./functions/update_object.txt:9: error: invalid types 'float[int]' for array sub
script
./functions/update_object.txt:10: error: invalid types 'float[int]' for array su
bscript
make: *** [main.o] Error 1

i've been looking around for an answer and none have worked so i'm beginning to think that you can't pass a multi array into a function(which is odd)

edit: i figured it out i changed:
(float *)(blah)
to
(float **)(blah)

[yaustar]

My posted code compiles straight off. If you are using this, then you have applied the concept incorrectly. You can't pass a multi-dimension static sized array due to the way that the memory is laid out. That is why I converted it to a one dimensional array before passing it to a function.

[slicer4ever]

nvm i found out what i was doing and no longer need that as i like to declare my functions after my main function so i called the function earlier in the program and forgot to go back and change that now it's working=-)

[sakya]

Hi! :)

I'm a noob and I have a noob question for you. :)
I searched the forum but didn't find any answer.

I have a problema with the function sceDisplaySetBrightness.
The first time I try to execute it my program hangs and returns to the dashboard.

Can someone help me, please?

Here's my code:

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

PSP_MODULE_INFO("Brightness Test ", 0x1000, 1, 1);

void sceDisplay_driver_9E3C6DC6(int a0,int a1);//a0 0-100,a1 = 0/1 (set to 0)
#define sceDisplaySetBrightness sceDisplay_driver_9E3C6DC6
void sceDisplay_driver_31C4BAA8(int *a0,int *a1);
#define sceDisplayGetBrightness sceDisplay_driver_31C4BAA8

// TWILIGHT ZONE! <do doo do doo>
/* 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;
}
// END OF TWILIGHT ZONE! <do doo do do>

int main() {
		  scePowerSetClockFrequency(222, 222, 111);

          pspDebugScreenInit();
          SetupCallbacks();

		  int curBrightness = 0;
		  SceCtrlData pad;

		  curBrightness = 100;
		  pspDebugScreenSetTextColor(0xffffff);
		  pspDebugScreenSetBackColor(0x000000);
		  pspDebugScreenInit();

		  pspDebugScreenSetXY(0, 23);
		  pspDebugScreenPrintf("Press L or R to change brightness");
		  pspDebugScreenSetXY(0, 24);
		  pspDebugScreenPrintf("Press TRIANGLE to exit");

		  while(1) {
			pspDebugScreenSetXY(0, 15);
			pspDebugScreenPrintf("Current brightness: %i", curBrightness);				

			sceCtrlReadBufferPositive(&pad, 1);
			if(pad.Buttons & PSP_CTRL_LTRIGGER) {
				if (curBrightness > 0){
					curBrightness--;
					sceDisplaySetBrightness(curBrightness, 0);
				}
			}else if(pad.Buttons & PSP_CTRL_RTRIGGER) {
				if (curBrightness < 100){
					curBrightness++;
					sceDisplaySetBrightness(curBrightness, 0);
				}
			}else if(pad.Buttons & PSP_CTRL_TRIANGLE) {
				break;
			}
			sceKernelDelayThread(100000);
		  }
		  sceKernelExitGame();
		  return(0);
}

Many thanks. :)
Ciaooo
Sakya

[MiG]

My posted code compiles straight off. If you are using this, then you have applied the concept incorrectly. You can't pass a multi-dimension static sized array due to the way that the memory is laid out. That is why I converted it to a one dimensional array before passing it to a function.

since when ?

Surely,

void functionName(int array [][10])
{
   //Code goes here
}

that works no ? cos my programs let me ?

[yaustar]

since when ?

Surely,

void functionName(int array [][10])
{
   //Code goes here
}

that works no ? cos my programs let me ?

Sorry, I meant to add "via pointer to a pointer".

void function( int ** anArray )
{
	// This won't work if you pass a statically sized array
}

void function( int anArray[10][10] )
{
	// This will work as expected as long as the size of the arrays are correct
}

[hallo007]

Hi! :)

I'm a noob and I have a noob question for you. :)
I searched the forum but didn't find any answer.

I have a problema with the function sceDisplaySetBrightness.
The first time I try to execute it my program hangs and returns to the dashboard.

Can someone help me, please?

Here's my code:

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

PSP_MODULE_INFO("Brightness Test ", 0x1000, 1, 1);

void sceDisplay_driver_9E3C6DC6(int a0,int a1);//a0 0-100,a1 = 0/1 (set to 0)
#define sceDisplaySetBrightness sceDisplay_driver_9E3C6DC6
void sceDisplay_driver_31C4BAA8(int *a0,int *a1);
#define sceDisplayGetBrightness sceDisplay_driver_31C4BAA8

// TWILIGHT ZONE! <do doo do doo>
/* 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;
}
// END OF TWILIGHT ZONE! <do doo do do>

int main() {
		  scePowerSetClockFrequency(222, 222, 111);

          pspDebugScreenInit();
          SetupCallbacks();

		  int curBrightness = 0;
		  SceCtrlData pad;

		  curBrightness = 100;
		  pspDebugScreenSetTextColor(0xffffff);
		  pspDebugScreenSetBackColor(0x000000);
		  pspDebugScreenInit();

		  pspDebugScreenSetXY(0, 23);
		  pspDebugScreenPrintf("Press L or R to change brightness");
		  pspDebugScreenSetXY(0, 24);
		  pspDebugScreenPrintf("Press TRIANGLE to exit");

		  while(1) {
			pspDebugScreenSetXY(0, 15);
			pspDebugScreenPrintf("Current brightness: %i", curBrightness);				

			sceCtrlReadBufferPositive(&pad, 1);
			if(pad.Buttons & PSP_CTRL_LTRIGGER) {
				if (curBrightness > 0){
					curBrightness--;
					sceDisplaySetBrightness(curBrightness, 0);
				}
			}else if(pad.Buttons & PSP_CTRL_RTRIGGER) {
				if (curBrightness < 100){
					curBrightness++;
					sceDisplaySetBrightness(curBrightness, 0);
				}
			}else if(pad.Buttons & PSP_CTRL_TRIANGLE) {
				break;
			}
			sceKernelDelayThread(100000);
		  }
		  sceKernelExitGame();
		  return(0);
}

Many thanks. :)
Ciaooo
Sakya

can you set it to 100? isnt 4 the maximum?

[sakya]

Hi! :)

can you set it to 100? isnt 4 the maximum?

The first parameter is 0-100:

void sceDisplay_driver_9E3C6DC6(int a0,int a1);//a0 0-100,a1 = 0/1 (set to 0)

:)

Ciaooo
Sakya

[hallo007]

sceKernelDelayThread(1000 00);
is in your while loop , you will be able to push a button for 0,00000000000000000000000 0000000000000001 seconds :P
use it like this ;-)

if (curBrightness < 100)
{
     curBrightness++;
     sceDisplaySetBrightness(curBrightness, 0);
     sceKernelDelayThread(100000);
}

understand? feel free to ask questions;-)

[sakya]

Hi! :)

Many thanks for your reply. :)

sceKernelDelayThread(1000 00);
is in your while loop , you will be able to push a button for 0,00000000000000000000000 0000000000000001 seconds :P
use it like this ;-)

Oooops, many thanks. ;)
I fixed this by moving the sceKernelDelayThread() after sceDisplaySetBrightness() , but the program keeps hanging when I press L to change brightness.

Ciaooo
Sakya

[pspballer07]

I need some help. How do you play a pmf file? Is there a library with a tutorial to download?

[MiG]

Hi! :)

Many thanks for your reply. :)


Oooops, many thanks. ;)
I fixed this by moving the sceKernelDelayThread() after sceDisplaySetBrightness() , but the program keeps hanging when I press L to change brightness.

Ciaooo
Sakya

Seen as sceKernelDelayThread(1000 0); will delay your program for a lonnng time, i think its 10s ? i don't know how the delays work on the PSP, but if its milliseconds, it will delay your app for 10s. Change it to something like 100, its just to stop the user from frantically changing the settings.

MiG

[hallo007]

no
1000000 is 1 second ;-)

[MaTiAz]

no
1000000 is 1 second ;-)

Yeah, sceKernelDelayThread takes the time to wait as microseconds.

BTW, I'm having trouble with building PSPlink & psplinkusb with the new toolchain. If anyone has the PC side binaries for Ubuntu and would like to share them, please PM me :)

[sakya]

Hi! :)

no
1000000 is 1 second ;-)

Yes, the program doesen't sleep for 10 seconds or 1 second. :)
Nobody knows why sceDisplaySetBrightness() makes my program hang?
Or have someone an example usage of this function?

Many thanks.
Ciaooo
Sakya

[hallo007]

check this thread ;)
http://forums.ps2dev.org/viewtopic.p...ysetbrightness

[BlackShark]

I gotz a question! (obviously :P) Im porting my game to the Old School Library and as such i found it ridiculesly easy to rotate images, so, I would like to rotate smoothly instead of the simple up,down,left,right directions, problem is, how would i make a bullet System to match that??? My result is much like what CS 2d is, but he uses a C++ class for his bullet system, How would i do this in C?
Thank you!

[SG57]

BlackShark - A C++ class can be ported to C via removing the function names class:: pre-fix. As for how he rotated to match the direction vector, one method would be to make a particle engine, and have the bullet be a particle but with a constant, fixed rate of fading and color change for each particle, giving it that solid color look. As for the other method (rotating an actual bullet image to the direction vector) you could grab a point somewhere along your player's direction vector and use atan2f to get what degree it is rotated to your player. Hope that helps (if you need any more help, im free tonight)

[BlackShark]

Well, I am not that experienced so I would not even know were to begin in making a particle engine :S

[SG57]

Well, then go with the second option. It may be even faster as it doesnt require as many trig calculations per cycle.

For the second option, here's what i would when the bullet is fired (AKA when the X or R trigger button is pressed)

Note: The bullet image would need to have 0 degrees as straight up.

if(osl_key->pressed.cross && numBulletsOnScreen < MAX_BULLETS) {
    bullet[currentBullet].image->angle = atan2f((crosshair.y+crosshair.image->height*0.5) - (player.y+player.image->height*0.5), (crosshair.x+crosshair.image->width*0.5) - (player.x+player.image->width*0.5)); // the *0.5 is faster then /2, which is centering where to shoot the bullet from, you could even mod these to shoot from the end of hte barrel for better accuracy
    bullet[currentBullet].xspeed = oslCos(bullet[currentBullet].angle,1);
    bullet[currentBullet].yspeed = oslSin(bullet[currentBullet].angle,1);
    bullet[currentBullet].onScreen = true;		
    if(currentBullet >= MAX_BULLETS)
        currentBullet = 0;
    else
        currentBullet += 1;
}

Then you'd say if currentBullet onScreen is true, draw it and move the X values via adding xspeed and Y values via adding yspeed. I might make an example just for fun, but my PSP is currently non useable (it works, its just the LCD is not plugged in)

[MaTiAz]

Hi! :)

Yes, the program doesen't sleep for 10 seconds or 1 second. :)
Nobody knows why sceDisplaySetBrightness() makes my program hang?
Or have someone an example usage of this function?

Many thanks.
Ciaooo
Sakya

It may be either that you are not in kernel mode (but it shouldn't totally freeze if you're in user mode) or the 1.5 kernel doesn't support that function.

[slicer4ever]

edit: i found my prob i plan to release the source to this later

[PSPJunkie_]

Blackshark, think about it like this. Say you have a cursor on the screen and when you shoot you want to the bullet to shoot in the direction of the cursor. The concept for what you want to do is just to make the cursor invisible. So, as your character rotates, the bullet is always shooting in the direction the character is facing (In which the cursor would usually be).

[vodkkaa]

i want to load ELF using this code

 if (pad.Buttons & PSP_CTRL_RTRIGGER){
	    struct SceKernelLoadExecParam param;
		
		memset(&param, 0, sizeof(param));

		param.size = sizeof(param);
		param.args = strlen(DEFINED_ELF)+1;
		param.argp = DEFINED_ELF;
		param.key = "game";

		sceKernelLoadExec(DEFINED_ELF, &param);
    }

psp resets when loading the elf