C/C++ Programming Help Thread

[JaSo PsP]

Can't you just call rand() every time you want a new random value...?

If you look on page 289, BlackShark shows the method that im currently using for random numbers, its good but it gets chosen every second, even if i type GetRandomNumber(no1, no2) again, it doesnt do it until the next second is up...

Heres what BlackShark wrote:

Try defining this above your while loop...


Code:
int GetRandomNum(int lo, int hi) {
SceKernelUtilsMt19937Cont ext ctx;
sceKernelUtilsMt19937Init (&ctx, time(NULL)); //SEED TO TIME
u32 rand_val = sceKernelUtilsMt19937UInt (&ctx);
rand_val = lo + rand_val % hi;
return (int)rand_val;
}
Then call it like,


Code:
GetRandomNum(*INSERT # HERE* , *INSERT # HERE*)

O yes, and MAKE SURE that you put


Code:
#include </usr/include/sys/stat.h>
up were the rest of your #include's are let me know if this works for you.

[slicer4ever]

ok i have a prob with my 3d object

Spoiler for code of rotation:

	float inc_rate = 0.1f;
	droney[1] += inc_rate;
	float angle = droney[1]*(PI/180.0f);

	
        dronexrot = (float)sin((angle+90.0f)*(PI/180.0f))*(0.02f);
	dronezrot = (float)cos((angle+90.0f)*(PI/180.0f))*(0.02f)*-1;
	dronex[1] = dronexrot;
	dronez[1] = dronezrot;

	float xtrans = -10-xpos+dronex[1];
	float ztrans = -10-zpos+dronez[1];
	float ytrans = -walkbias-0.45f-ypos;
	float sceneroty = ((360.0f)*(PI/180.0f)) - ((yrot)*(PI/180.0f));
	sceGumLoadIdentity();
        {
		ScePspFVector3 move = {xtrans,ytrans, ztrans};
		sceGumRotateX(lookupdown);
		sceGumRotateY(sceneroty);
		sceGumTranslate( &move );
		sceGumRotateY(angle);

	}

thats just for rotation i got it to rotate in degrees instead of radians but now i can't get the object to move in the direction it is faceing and i'm not sure why i believe that code should work but it won't and it's makeing mad i've made countless modifications 2 it yet it still won't work

um just wanted to make sure my prob hasn't got lost also don't think i've just stopped after posting i've been trying other ways of course to no avail

[Insert_Witty_Name]

If you look on page 289, BlackShark shows the method that im currently using for random numbers, its good but it gets chosen every second, even if i type GetRandomNumber(no1, no2) again, it doesnt do it until the next second is up...

That function is one I wrote.

If it's taking a second to execute, you're doing something else wrong, post up your code.

You should never expect an answer either as you did, the ratio between people asking questions and the people knowledgable enough to answer them is sided very much toward the askers.

[BlackShark]

yes that is IWN's function, I just got it from one of his Tuts (Awesome tuts by the way IWN, helped me alot)

[JaSo PsP]

That function is one I wrote.

If it's taking a second to execute, you're doing something else wrong, post up your code.

You should never expect an answer either as you did, the ratio between people asking questions and the people knowledgable enough to answer them is sided very much toward the askers.

My code is:

Spoiler for Code:

//Race Game

#include <pspdisplay.h>
#include <pspctrl.h>
#include <pspkernel.h>
#include <pspdebug.h>
#include <png.h>
#include <stdio.h>
#include </usr/include/sys/stat.h>
#include "graphics.h"

PSP_MODULE_INFO("Race Game", 0, 1, 1);

#define RGB(r, g, b) ((r)|((g)<<8)|((b)<<16))
typedef enum _bool { false, true } bool;

/* 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 main()
{
    bool exitFlag = false, resetFlag = false;
    
    while(exitFlag == false)
    {
    char playerBuffer1[100];
    char playerBuffer2[100];
    char comBuffer1[100];
    char comBuffer2[100];
    char finishBuffer[100];
    char winningText[40];
    char difficultyText[30];
    
    Image* finish;
    Image* player;
    Image* com;
    Image* pf1;
    Image* pf2;
    Image* cf1;
    Image* cf2;
    
    pspDebugScreenInit();
    SetupCallbacks();
    initGraphics();
    
    int GetRandomNum(int lo, int hi)
    {
        SceKernelUtilsMt19937Context ctx;
        sceKernelUtilsMt19937Init(&ctx, time(NULL)); //SEED TO TIME
        u32 rand_val = sceKernelUtilsMt19937UInt(&ctx);
        rand_val = lo + rand_val % hi;
        return (int)rand_val;
    }
    
    int playerX = 5;
    int playerY = 106;
    int comX = 5;
    int comY = 160;
    int pstate = 0;
    int cstate = 0;
    int finishPointP;
    int finishPointC;
    int winner;
    int difficulty = 20;
    int diff2;
    int i;
    int players;
    int randNum;
    
    sprintf(finishBuffer, "finishLine.png");
    sprintf(playerBuffer1, "playerFrame1.png");
    sprintf(playerBuffer2, "playerFrame2.png");
    sprintf(comBuffer1, "comFrame1.png");
    sprintf(comBuffer2, "comFrame2.png");
    
    pf1 = loadImage(playerBuffer1);
    pf2 = loadImage(playerBuffer2);
    cf1 = loadImage(comBuffer1);
    cf2 = loadImage(comBuffer2);
    finish = loadImage(finishBuffer);
    
    com = cf1;
    player = pf1;
    
    Color basicText = RGB(100, 100, 100);
    Color textSelected = RGB(255, 20, 20);
    
    SceCtrlData pad;
    
    while(resetFlag == false)
    {
    while(1)
    {
            sceCtrlReadBufferPositive(&pad, 1);
            clearScreen(0);
            
            printTextScreen(200, 20, "Running Race, By Jason", basicText);
            printTextScreen(200, 40, "Press the L trigger for one player", basicText);
            printTextScreen(200, 30, "Press the R trigger for two player", basicText);
            sprintf(difficultyText, "Difficulty: %i", difficulty);
            
            printTextScreen(200, 70, difficultyText, textSelected);
                        
            if(pad.Buttons & PSP_CTRL_RIGHT)
            {
                           difficulty++;
                           for(i = 0; i < 5; i++)
                           {
                                  sceDisplayWaitVblankStart();
                           }
            }
            else if(pad.Buttons & PSP_CTRL_LEFT)
            {
                           difficulty--;
                           for(i = 0; i < 5; i++)
                           {
                                  sceDisplayWaitVblankStart();
                           }
            }
            else if(pad.Buttons & PSP_CTRL_LTRIGGER)
            {
                 diff2 = difficulty - 1;
                 players = 1;
                 break;
            }
            else if(pad.Buttons & PSP_CTRL_RTRIGGER)
            {
                 players = 2;
                 break;
            }
            flipScreen();
    }
    
    while(players == 1)
    {
            sceCtrlReadBufferPositive(&pad, 1);
            clearScreen(0);
            
            randNum = GetRandomNum(0, difficulty);
            
            finishPointP = playerX + 20;
            finishPointC = comX + 20;
            
            if(randNum == diff2)
            {
                       do
                       {
                        if(cstate == 0)
                        {
                                  com = cf2;
                                  comX += 3;
                                  cstate = 1;
                        }
                        else if(cstate == 1)
                        {
                                  com = cf1;
                                  comX += 3;
                                  cstate = 0;
                        }
                        }
                        while(randNum != diff2);
                        randNum = 999;
            }
            
            blitAlphaImageToScreen(0, 0, 20, 40, com, comX, comY);
            blitAlphaImageToScreen(0, 0, 20, 40, player, playerX, playerY);
            blitAlphaImageToScreen(0, 0, 20, 272, finish, 460, 0);
            
            if(finishPointP > 460)
            {
                            winner = 0;
                            resetFlag = true;
                            exitFlag = false;
                            break;
            }
            else if(finishPointC > 460)
            {
                            winner = 1;
                            resetFlag = true;
                            exitFlag = true;
                            break;
            }
            
            if(pad.Buttons & PSP_CTRL_CROSS)
            {
                           if(pad.Buttons & PSP_CTRL_CIRCLE)
                           {
                           }
                           else if(pstate == 0)
                           {
                                    player = pf2;
                                    playerX += 3;
                                    pstate = 1;
                           }
            }
            
            if(pad.Buttons & PSP_CTRL_CIRCLE)
            {
                           if(pad.Buttons & PSP_CTRL_CROSS)
                           {
                           }
                           else if(pstate == 1)
                           {
                                    player = pf1;
                                    playerX += 3;
                                    pstate = 0;
                           }
            }
            flipScreen();
    }
    
    while(players == 2)
    {
            sceCtrlReadBufferPositive(&pad, 1);
            clearScreen(0);
            
            finishPointP = playerX + 20;
            finishPointC = comX + 20;
            
            blitAlphaImageToScreen(0, 0, 20, 40, com, comX, comY);
            blitAlphaImageToScreen(0, 0, 20, 40, player, playerX, playerY);
            blitAlphaImageToScreen(0, 0, 20, 272, finish, 460, 0);
            
            if(finishPointP > 460)
            {
                            winner = 0;
                            resetFlag = true;
                            exitFlag = false;
                            break;
            }
            else if(finishPointC > 460)
            {
                            winner = 1;
                            resetFlag = true;
                            exitFlag = false;
                            break;
            }
            
            if(pad.Buttons & PSP_CTRL_LEFT)
            {
                           if(pad.Buttons & PSP_CTRL_DOWN)
                           {
                           }
                           else if(cstate == 0)
                           {
                                     com = cf2;
                                     comX += 3;
                                     cstate = 1;
                           }
            }
            
            if(pad.Buttons & PSP_CTRL_DOWN)
            {
                           if(pad.Buttons & PSP_CTRL_LEFT)
                           {
                           }
                           else if(cstate == 1)
                           {
                                     com = cf1;
                                     comX += 3;
                                     cstate = 0;
                           }
            }
            
            if(pad.Buttons & PSP_CTRL_CROSS)
            {
                           if(pad.Buttons & PSP_CTRL_CIRCLE)
                           {
                           }
                           else if(pstate == 0)
                           {
                                    player = pf2;
                                    playerX += 3;
                                    pstate = 1;
                           }
            }
            
            if(pad.Buttons & PSP_CTRL_CIRCLE)
            {
                           if(pad.Buttons & PSP_CTRL_CROSS)
                           {
                           }
                           else if(pstate == 1)
                           {
                                    player = pf1;
                                    playerX += 3;
                                    pstate = 0;
                           }
            }
            flipScreen();
    }
    }
    
    
    if(winner == 0)
    {
         if(players == 1)
         {
              sprintf(winningText, "You Won!  --  Start To Restart");
         }
         else if(players == 2)
         {
              sprintf(winningText, "Player 1 Won!  --  Start To Restart");
         }
    }
    else if(winner == 1)
    {
         if(players == 1)
         {
              sprintf(winningText, "The Computer Won  --  Start To Restart");
         }
         else if(players == 2)
         {
              sprintf(winningText, "Player 2 Won!  --  Start To Restart");
         }
    }
    
    clearScreen(0);
    printTextScreen(200, 140, winningText, basicText);
    
    flipScreen();
    while(1)
    {
            sceCtrlReadBufferPositive(&pad, 1);
            if(pad.Buttons & PSP_CTRL_START)
            {
                           resetFlag = false;
                           break;
            }
    }
    }
    
    sceKernelSleepThread();
    return 0;
}

[Insert_Witty_Name]

This code:

    int GetRandomNum(int lo, int hi)
    {
        SceKernelUtilsMt19937Context ctx;
        sceKernelUtilsMt19937Init(&ctx, time(NULL)); //SEED TO TIME
        u32 rand_val = sceKernelUtilsMt19937UInt(&ctx);
        rand_val = lo + rand_val % hi;
        return (int)rand_val;
    }

Is a function, and should be before your main function, not inside it.

That must have given you warnings when compiling... Never ignore warnings.

Link to the tutorial previously mentioned: http://www.psp-programming.com/forum...hp?topic=961.0

[JaSo PsP]

This code:

    int GetRandomNum(int lo, int hi)
    {
        SceKernelUtilsMt19937Context ctx;
        sceKernelUtilsMt19937Init(&ctx, time(NULL)); //SEED TO TIME
        u32 rand_val = sceKernelUtilsMt19937UInt(&ctx);
        rand_val = lo + rand_val % hi;
        return (int)rand_val;
    }

Is a function, and should be before your main function, not inside it.

That must have given you warnings when compiling... Never ignore warnings.

Link to the tutorial previously mentioned: http://www.psp-programming.com/forum...hp?topic=961.0

nope, cygwin didnt give any warnings. And yeah, i shouldve noticed that, too much code confuses me...

[BlackShark]

Try defining this above your while loop...

int GetRandomNum(int lo, int hi) {
 SceKernelUtilsMt19937Context ctx;
 sceKernelUtilsMt19937Init(&ctx, time(NULL)); //SEED TO TIME
 u32 rand_val = sceKernelUtilsMt19937UInt(&ctx);
 rand_val = lo + rand_val % hi;
 return (int)rand_val;
}

That probably would have been it,

any way, Does any body know how I can set up a for directional bullet system?

[slicer4ever]

@blackshark simple create a var to contain the direction of your bullet then a simple if statement telling if it is this direction then move this way

i still need help on:

ok i have a prob with my 3d object

Spoiler for code of rotation:

	float inc_rate = 0.1f;
	droney[1] += inc_rate;
	float angle = droney[1]*(PI/180.0f);

	
        dronexrot = (float)sin((angle+90.0f)*(PI/180.0f))*(0.02f);
	dronezrot = (float)cos((angle+90.0f)*(PI/180.0f))*(0.02f)*-1;
	dronex[1] = dronexrot;
	dronez[1] = dronezrot;

	float xtrans = -10-xpos+dronex[1];
	float ztrans = -10-zpos+dronez[1];
	float ytrans = -walkbias-0.45f-ypos;
	float sceneroty = ((360.0f)*(PI/180.0f)) - ((yrot)*(PI/180.0f));
	sceGumLoadIdentity();
        {
		ScePspFVector3 move = {xtrans,ytrans, ztrans};
		sceGumRotateX(lookupdown);
		sceGumRotateY(sceneroty);
		sceGumTranslate( &move );
		sceGumRotateY(angle);

	}

thats just for rotation i got it to rotate in degrees instead of radians but now i can't get the object to move in the direction it is faceing and i'm not sure why i believe that code should work but it won't and it's makeing mad i've made countless modifications 2 it yet it still won't work

-= Double Post =-
nvm i got it working now i can finally continue with my game=-)

[Mr305]

That probably would have been it,

any way, Does any body know how I can set up a for directional bullet system?[/COLOR]

Consider this "Half-full"+ or "Half-Empty"-. That's up to you, IMHonestO I think it's fair to come up with generic question but not with ones that are specific to gameplay, becz that's what makes it unique

Btw, how's the progress goin?

[Grimfate126]

This code:

    int GetRandomNum(int lo, int hi)
    {
        SceKernelUtilsMt19937Context ctx;
        sceKernelUtilsMt19937Init(&ctx, time(NULL)); //SEED TO TIME
        u32 rand_val = sceKernelUtilsMt19937UInt(&ctx);
        rand_val = lo + rand_val % hi;
        return (int)rand_val;
    }

Is a function, and should be before your main function, not inside it.

That must have given you warnings when compiling... Never ignore warnings.

Link to the tutorial previously mentioned: http://www.psp-programming.com/forum...hp?topic=961.0

does it work with negatives? as in:

GetRandomNum(-10, 10);

would that work?

[slicer4ever]

math prob:

how do i find the angle of an object compared fto another object

e.g. my object is sitting in a position i click somewhere now i need to find the current angle of the clicked position and my objects position...how?

[nataku92]

use the atan2f function.

example:

float theta = atan2f(objecty - clickedy, objectx - clickedx);

You may have to switch the object and clicked positions depending on from which position you want the angle to be measured.

[BlackShark]

Consider this "Half-full"+ or "Half-Empty"-. That's up to you, IMHonestO I think it's fair to come up with generic question but not with ones that are specific to gameplay, becz that's what makes it unique

Btw, how's the progress goin?

Ok so far, definetly a learning experience, working on AI now, (still no bullet system) Id give you a screen shot of the menu (pretty much done) and the game but I can't do screen shots yet. maybe later!

[slicer4ever]

@nataku i did that but i forgot to remove another part of the script which reset the angle before it was rotated thats y i asked but now it's all fixed anywyas can i ask whats the diffrence between atan and atan2?(always wondered)

[nataku92]

atan2 is able to return an angle from -pi to pi, while atan can only return -pi/2 to pi/2

[slicer4ever]

o i see

[Access_Denied]

Would someone mind posting a code for scanning a directory? I have researched quite a bit, including looking though th SDK includes, but I just can't get it right. I just need to know the files in a directory, and whether or not they are files or folders.

[psphacker12.]

Im trying to compile a id3 lib but it just wont work:

[email protected] /cygdrive/c/projects/pxs
$ cd c:/projects/id3lib-5

[email protected] /cygdrive/c/projects/id3lib-5
$ ./configure --prefix=/home/luser
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for gawk... gawk
checking whether make sets ${MAKE}... yes
checking for style of include used by make... GNU
checking for gcc... gcc
checking for C compiler default output... configure: error: C compiler cannot cr
eate executables

[SG57]

If you are using that PSPDev Win32 thing, it wotn work.

[psphacker12.]

im re-installing cygwin now...

[SG57]

Uhm, good for you?

[Dream_Team]

meh stop spamming the thread psp12 ,please.

Access_Denied : I think when you scan a directory, the sub-folders end with a / , if it ends by / , youre sure that it's not a file. I can't provide you my code, it's bugged as hell ^^

[Psilocybeing]

Would someone mind posting a code for scanning a directory? I have researched quite a bit, including looking though th SDK includes, but I just can't get it right. I just need to know the files in a directory, and whether or not they are files or folders.

Do you need to scan all sub-directories as well? I have my resource loading function for Traveller that scans a directory and loads all PNG files found into the resource holder, however it is not recursive, although that would not involve much modification. If this could be of help I'll clean it up and post it for you :)

[jsharrad]

Would someone mind posting a code for scanning a directory? I have researched quite a bit, including looking though th SDK includes, but I just can't get it right. I just need to know the files in a directory, and whether or not they are files or folders.

http://www.psp-programming.com/forum...ic,1333.0.html

[pspfreak9]

How can I make a code that says some thin like if the power switch is pressed up then do whatever i want. how would i do that?

[Access_Denied]

Check out C:/cygwin/usr/local/pspdev/psp/sdk/include/pspctrl.h

[MaTiAz]

Check out C:/cygwin/usr/local/pspdev/psp/sdk/include/pspctrl.h

Or the docs, at /usr/local/pspdev/psp/sdk/doc/html/index.html :)

[pspfreak9]

Which one of these would be the power switch:

	/** Select button. */
	PSP_CTRL_SELECT     = 0x000001,
	/** Start button. */
	PSP_CTRL_START      = 0x000008,
	/** Up D-Pad button. */
	PSP_CTRL_UP         = 0x000010,
	/** Right D-Pad button. */
	PSP_CTRL_RIGHT      = 0x000020,
	/** Down D-Pad button. */
	PSP_CTRL_DOWN      	= 0x000040,
	/** Left D-Pad button. */
	PSP_CTRL_LEFT      	= 0x000080,
	/** Left trigger. */
	PSP_CTRL_LTRIGGER   = 0x000100,
	/** Right trigger. */
	PSP_CTRL_RTRIGGER   = 0x000200,
	/** Triangle button. */
	PSP_CTRL_TRIANGLE   = 0x001000,
	/** Circle button. */
	PSP_CTRL_CIRCLE     = 0x002000,
	/** Cross button. */
	PSP_CTRL_CROSS      = 0x004000,
	/** Square button. */
	PSP_CTRL_SQUARE     = 0x008000,
	/** Home button. */
	PSP_CTRL_HOME       = 0x010000,
	/** Hold button. */
	PSP_CTRL_HOLD       = 0x020000,
	/** Music Note button. */
	PSP_CTRL_NOTE       = 0x800000,
	/** Screen button. */
	PSP_CTRL_SCREEN     = 0x400000,
	/** Volume up button. */
	PSP_CTRL_VOLUP      = 0x100000,
	/** Volume down button. */
	PSP_CTRL_VOLDOWN    = 0x200000,
	/** Wlan switch up. */
	PSP_CTRL_WLAN_UP    = 0x040000,
	/** Remote hold position. */
	PSP_CTRL_REMOTE     = 0x080000,	
	/** Disc present. */
	PSP_CTRL_DISC       = 0x1000000,
	/** Memory stick present. */
	PSP_CTRL_MS         = 0x2000000,
};

[youresam]

The power switch is in the psppower.h file. Look at the PSPSDK sample on how to use it.

(lol @ access_denied suggesting pspctrl)