C/C++ Programming Help Thread

[Lukeson]

Looks like it affects it to me mate.

Follow the function through logically - it's pretty easy to understand.

What are you trying to achieve exactly? I feel there will be an easier and faster way to execute it. The above function will be quite slow.

Yeah ok. I already wanted to edit my post. I used it but it turns my partially transparent PNGs into transparent squares :S. What I want to do is fade out the images of my mainmenu... .

[Insert_Witty_Name]

Faster way, draw a quad over the top that's black (or whatever color you want to fade out to) and covers the entire screen and then alter the alpha value of the color.

Something like this:

//////////////////////////////////////////////////////////////////////
// Name: FadeScreen
// Purpose: Fades the screen in/out (white)
// Returns: NONE
// Usage: Pass a value from 0.0f increasing to 1.0f to fade in,
//        1.0f decreasing to 0.0f to fade out
//////////////////////////////////////////////////////////////////////
void FadeScreen(const float FadeInAlphaValue)
{
guStart();
sceGuDisable(GU_TEXTURE_2D);
CSVertex* vertices = (CSVertex*) sceGuGetMemory(2 * sizeof(CSVertex));
          vertices[0].color = GU_COLOR(1.0f, 1.0f, 1.0f, FadeInAlphaValue);
          vertices[0].x = 0;
          vertices[0].y = 0;
          vertices[0].z = 0;
          vertices[1].color = GU_COLOR(1.0f, 1.0f, 1.0f, FadeInAlphaValue);
          vertices[1].x = 480;
          vertices[1].y = 272;
          vertices[1].z = 0;
sceGuDrawArray(GU_SPRITES, GU_COLOR_8888 | GU_VERTEX_16BIT | GU_TRANSFORM_2D, 2, 0, vertices);
sceGuEnable(GU_TEXTURE_2D);
sceGuFinish();
sceGuSync(0, 0);
}

Where CSVertex is:

typedef struct
{
	unsigned int color;
	short x, y, z;
} CSVertex;

You can of course alter the function to take your own arguments - but this one is hard set to white.

[Moonchild]

Faster way, draw a quad over the top that's black (or whatever color you want to fade out to) and covers the entire screen and then alter the alpha value of the color.

Sometimes you have to change the alpha value without making a fade effect though...

I believe this should save the transparency that's already there:

void SetAlphaImage(Image * image, unsigned int alpha)
{
	int size;
	Color *databuf;

	if(!image->data)
		return;
		
	if(alpha>255) alpha = 255;
	if(alpha<0) alpha = 0;

	size = image->textureWidth * image->textureHeight;
	databuf = image->data;

	for(i = 0; i <= size; i++)
	{
		*databuf = (*databuf & 0x00ffffff) | ((A(*databuf)-(A(*databuf)-alpha))<<24);
		databuf++;
	}
}

[Lukeson]

Uhm, I compared this with the old version and I don't actually see a difference.

My recent Problem: (sorry for so many code)

/* ------------------------------------- ARRAY PART 1 ------------------------------------- */

    mainMenu[0].subMenu =(MenuItem *)malloc(5 * sizeof(MenuItem));
    mainMenu[0].subMenu[0].iconHigh = loadImage("./img/mainmenu/s_eq_high.png");
    mainMenu[0].subMenu[0].iconLow  = loadImage("./img/mainmenu/s_eq_low.png");
    mainMenu[0].subMenu[0].imgOffsetX = 5;
    mainMenu[0].subMenu[0].lblOffsetX = -3;
    sprintf(mainMenu[0].subMenu[0].label, "EQUALIZER");
    mainMenu[0].subMenu[1].iconHigh = loadImage("./img/mainmenu/s_repeat_high.png");
    mainMenu[0].subMenu[1].iconLow  = loadImage("./img/mainmenu/s_repeat_low.png");
    mainMenu[0].subMenu[1].imgOffsetX = 5;
    mainMenu[0].subMenu[1].lblOffsetX = 0;
    sprintf(mainMenu[0].subMenu[1].label, "REPEAT");
    // [other menuitems]

/* ------------------------------------- ARRAY PART 2 ------------------------------------- */

    mainMenu[1].subMenu =(MenuItem *)malloc(1 * sizeof(MenuItem));
    mainMenu[1].subMenu[0].iconHigh = loadImage("./img/mainmenu/gen_high.png");
    mainMenu[1].subMenu[0].iconLow  = loadImage("./img/mainmenu/gen_low.png");
    mainMenu[1].subMenu[0].imgOffsetX = 5;
    mainMenu[1].subMenu[0].lblOffsetX = 0;
    sprintf(mainMenu[1].subMenu[0].label, "ARTISTS");
    mainMenu[1].activeMenuItem = 0;

/* ------------------------------------------------------------------------- */
/*                                 Functions                                               */
/* ------------------------------------------------------------------------- */


/* -------------------------------- Draw icon with text below it ------------------- */

    void drawSubMenuItem(int selMM, int selSM, int x, int y, int high)
    {
        if(high == 1) {
            if(mainMenu[selMM].subMenu[selSM].iconHigh) {
                blitAlphaImageToScreen(0 ,0 ,32 , 32, mainMenu[selMM].subMenu[selSM].iconHigh, x+mainMenu[selMM].subMenu[selSM].imgOffsetX, y);
            }
            printTextScreen(x+mainMenu[selMM].subMenu[selSM].lblOffsetX, y+36, mainMenu[selMM].subMenu[selSM].label, highlightColor);
        } else if(high == 0) {
            if(mainMenu[selMM].subMenu[selSM].iconLow) {
                blitAlphaImageToScreen(0 ,0 ,32 , 32, mainMenu[selMM].subMenu[selSM].iconLow, x+mainMenu[selMM].subMenu[selSM].imgOffsetX, y);
            }
            printTextScreen(x+mainMenu[selMM].subMenu[selSM].lblOffsetX, y+36, mainMenu[selMM].subMenu[selSM].label, dimmedColor);
        }
    }


/*-------------------- Draw vertical Menu of an XMB -------------------------------*/

    void drawSubMenu(selComponent)
    {
        int i, y;

        for(i=0; i<=sizeof(mainMenu[selComponent].subMenu); i++)
        {
            if(i < mainMenu[selComponent].activeMenuItem)
            {

                y = 60 - (mainMenu[selComponent].activeMenuItem-i) * subDistance;
                drawSubMenuItem(selComponent, i, subOffsetX, y, 0);

            } else if(i == mainMenu[selComponent].activeMenuItem) {

                drawSubMenuItem(selComponent, i, subOffsetX, 100, 1);

            } else if(i > mainMenu[selComponent].activeMenuItem) {

                y = 100 + (i-mainMenu[selComponent].activeMenuItem) * subDistance;;
                drawSubMenuItem(selComponent, i, subOffsetX, y, 0); 

            }
        }
    }



    // In my mainloop
    drawSubMenu(0); // using the first array works
    drawSubMenu(1); // Freezes the PSP on startup

When I call drawSubMenu with 0 as a parameter everything works fine. Using 1, which means using the 2nd part of the Array, the PSP freezes
-= Double Post =-
Added Comments.

[hallo007]

when i try to use the danzeff OSK , it gives tons of erroros

$ make kxploit
psp-gcc -I. -I/usr/local/pspdev/psp/sdk/include -O2 -G0 -Wall   -c -o main.o mai
n.c
In file included from danzeff.h:15,
                 from main.c:5:
pspctrl_emu.h:4:21: error: SDL/SDL.h: No such file or directory
In file included from danzeff.h:15,
                 from main.c:5:
pspctrl_emu.h:23: error: nested redefinition of 'enum PspCtrlButtons'
pspctrl_emu.h:23: error: redeclaration of 'enum PspCtrlButtons'
pspctrl_emu.h:25: error: redeclaration of enumerator 'PSP_CTRL_SELECT'
/usr/local/pspdev/psp/sdk/include/pspctrl.h:37: error: previous definition of 'P
SP_CTRL_SELECT' was here
pspctrl_emu.h:27: error: redeclaration of enumerator 'PSP_CTRL_START'
/usr/local/pspdev/psp/sdk/include/pspctrl.h:39: error: previous definition of 'P
SP_CTRL_START' was here
pspctrl_emu.h:29: error: redeclaration of enumerator 'PSP_CTRL_UP'
/usr/local/pspdev/psp/sdk/include/pspctrl.h:41: error: previous definition of 'P
SP_CTRL_UP' was here
pspctrl_emu.h:31: error: redeclaration of enumerator 'PSP_CTRL_RIGHT'
/usr/local/pspdev/psp/sdk/include/pspctrl.h:43: error: previous definition of 'P
SP_CTRL_RIGHT' was here
pspctrl_emu.h:33: error: redeclaration of enumerator 'PSP_CTRL_DOWN'
/usr/local/pspdev/psp/sdk/include/pspctrl.h:45: error: previous definition of 'P
SP_CTRL_DOWN' was here
pspctrl_emu.h:35: error: redeclaration of enumerator 'PSP_CTRL_LEFT'
/usr/local/pspdev/psp/sdk/include/pspctrl.h:47: error: previous definition of 'P
SP_CTRL_LEFT' was here
pspctrl_emu.h:37: error: redeclaration of enumerator 'PSP_CTRL_LTRIGGER'
/usr/local/pspdev/psp/sdk/include/pspctrl.h:49: error: previous definition of 'P
SP_CTRL_LTRIGGER' was here
pspctrl_emu.h:39: error: redeclaration of enumerator 'PSP_CTRL_RTRIGGER'
/usr/local/pspdev/psp/sdk/include/pspctrl.h:51: error: previous definition of 'P
SP_CTRL_RTRIGGER' was here
pspctrl_emu.h:41: error: redeclaration of enumerator 'PSP_CTRL_TRIANGLE'
/usr/local/pspdev/psp/sdk/include/pspctrl.h:53: error: previous definition of 'P
SP_CTRL_TRIANGLE' was here
pspctrl_emu.h:43: error: redeclaration of enumerator 'PSP_CTRL_CIRCLE'
/usr/local/pspdev/psp/sdk/include/pspctrl.h:55: error: previous definition of 'P
SP_CTRL_CIRCLE' was here
pspctrl_emu.h:45: error: redeclaration of enumerator 'PSP_CTRL_CROSS'
/usr/local/pspdev/psp/sdk/include/pspctrl.h:57: error: previous definition of 'P
SP_CTRL_CROSS' was here
pspctrl_emu.h:47: error: redeclaration of enumerator 'PSP_CTRL_SQUARE'
/usr/local/pspdev/psp/sdk/include/pspctrl.h:59: error: previous definition of 'P
SP_CTRL_SQUARE' was here
pspctrl_emu.h:49: error: redeclaration of enumerator 'PSP_CTRL_HOME'
/usr/local/pspdev/psp/sdk/include/pspctrl.h:61: error: previous definition of 'P
SP_CTRL_HOME' was here
pspctrl_emu.h:51: error: redeclaration of enumerator 'PSP_CTRL_HOLD'
/usr/local/pspdev/psp/sdk/include/pspctrl.h:63: error: previous definition of 'P
SP_CTRL_HOLD' was here
pspctrl_emu.h:53: error: redeclaration of enumerator 'PSP_CTRL_NOTE'
/usr/local/pspdev/psp/sdk/include/pspctrl.h:65: error: previous definition of 'P
SP_CTRL_NOTE' was here
pspctrl_emu.h:57: error: redefinition of 'struct SceCtrlData'
pspctrl_emu.h:68: error: redefinition of typedef 'SceCtrlData'
/usr/local/pspdev/psp/sdk/include/pspctrl.h:103: error: previous declaration of
'SceCtrlData' was here
pspctrl_emu.h:70: error: syntax error before '*' token
In file included from main.c:5:
danzeff.h:58:27: error: SDL/SDL_image.h: No such file or directory
In file included from main.c:5:
danzeff.h:60: error: syntax error before '*' token

here is my main.c

#include <math.h>//rekenmachine
#include <pspkernel.h>
#include <pspdebug.h>
#include <pspctrl.h>//controls
#include "danzeff.h"


#define printf pspDebugScreenPrintf
PSP_MODULE_INFO("calculator",0,0,1);
/* 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 y = 0;
int x =0;
int input;
void vermenigvuldigen();
void delen ();
void optellen();
void aftrekken();
SceCtrlData pad;
int main()
{
pspDebugScreenInit();
SetupCallbacks();
menu();
}
inline void menu()
{ 
danzeff_load();
danzeff_render(); 
while(1){
             sceCtrlReadBufferPositive(&pad,1);
             if(pad.Buttons & PSP_CTRL_START){
                              break;
                              }
             } 
       
       printf( "   ______   _______   _        ______     \n");  
       printf(  "  |  ____| |  ___  | | |      |  ____|      v0.01 Beta test   \n");
       printf(  "  | |      |  | |  | | |      | |               by roel      \n");
       printf(  "  | |____  |  ---  | | |____  | |____         (HALLO007)\n");
       printf(  "  |______| |__| |__| |______| |______|  -=[RP]=- Productions  \n\n\n");
       printf("druk start om het keyboard te openen\n");
       printf("1.vermenigvuldig\n");
       printf("2.delen\n");
       printf("3.optellen\n");
       printf("4.aftrekken\n");
       printf("selectie: %d" , input);
       printf("druk op [X] om de selectie te activeren");
while(1){
             sceCtrlReadBufferPositive(&pad,1);

          if(pad.Buttons & PSP_CTRL_CROSS) {
                       switch (input) {
                            case 1:
                            printf("test");
                            case 2: 
                            printf("test");
                            case 3:
                             printf("test");
                             case 4:
                             printf("test");
                             default:
                             printf("error , probeer opnieuw");
                              menu();
}  
}

              
}
} 
inline void vermenigvuldigen ()
{
       pspDebugScreenClear();//clear de screen                                 

       
       printf( "   ______   _______   _        ______     \n");  
       printf(  "  |  ____| |  ___  | | |      |  ____|      v0.01 Beta test   \n");
       printf(  "  | |      |  | |  | | |      | |               by roel      \n");
       printf(  "  | |____  |  ---  | | |____  | |____         (HALLO007)\n");
       printf(  "  |______| |__| |__| |______| |______|  -=[RP]=- Productions  \n");

printf("schrijf 2 getallen voor te vermenigvuldigen: \n");
printf("de waarde van het eerste getal : %d \n" , x); 
printf("druk[X] om te bevestigen\n");
while(1) {
         sceCtrlReadBufferPositive(&pad, 1);
         if (pad.Buttons & PSP_CTRL_CROSS) {
                         printf("de waarde van het tweede getal : %d\n" , y);
                         printf("druk [X] om te vermenigvuldigen\n"); 
}

} 
}

en here is the makefile

TARGET = calculator
OBJS = main.o danzeff.o

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

EXTRA_TARGETS = EBOOT.PBP
PSP_EBOOT_TITLE = calculator

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

[/code]

[Insert_Witty_Name]

There's a readme that comes with danzeff OSK.

Read it.

You need to choose within danzeff whether to use GU or SDL.

[hallo007]

that's the point i dont understand the readme

i want the use the SDL_Joystick

but dont know how do change it

[Insert_Witty_Name]

You need SDL installed to be able to use it...

I think the default for danzeff is SDL.

[Lukeson]

Uhm, I compared this with the old version and I don't actually see a difference.

My recent Problem: (sorry for so many code)
[ code ]
When I call drawSubMenu with 0 as a parameter everything works fine. Using 1, which means using the 2nd part of the Array, the PSP freezes

Problem solved

[Molly]

Glad to hear it.

[zmathue]

hay i was wondering if any one can help give me a code to check if a file exists then load it and have it tell me when it exits i look all over but i couldnt find any.

[Waterbottle]

hay i was wondering if any one can help give me a code to check if a file exists then load it and have it tell me when it exits i look all over but i couldnt find any.

could just do:

file = fopen("./file.txt", "r");
if(file==NULL) { //file dosn't exist
} else {
//file exists
}

[Moonchild]

hay i was wondering if any one can help give me a code to check if a file exists then load it and have it tell me when it exits i look all over but i couldnt find any.

To check if a file exists you simply do

//Open the file, change file path to the file you wish to check. rb indicates that it opens in read-binary mode.
FILE * file = fopen("file path", "rb");
//If file==0 (same as !file) the file doesn't exist
if(!file) { printf("file does not exist"); return 0; }
//Close the open file
fclose(file);
return 1;

Not sure what you mean by the "exit" part though.

[zmathue]

what i ment was when the app i loaded exits out of itself that i want it to tell my program that it exited and do something

[Moonchild]

Oh, in that case. Just add this to your main (preferbly where you intialize the app)

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

And then add this

/* Exit callback */
int exit_callback() {

  //Add stuff here	

  sceKernelExitGame();
  return 0;
}

[zmathue]

Oh, in that case. Just add this to your main (preferbly where you intialize the app)

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

And then add this

/* Exit callback */
int exit_callback() {

  //Add stuff here	

  sceKernelExitGame();
  return 0;
}

actualy I mean when i load the app that i checked if it exists when that app exits then i want it to do something.

[Electro]

whats the screen brightness button code
(the one beside note)

[Slasher]

whats the screen brightness button code
(the one beside note)

PSP_CTRL_SCREEN = 0x400000
It can only be read in kernel mode.

[Nutterbutter]

Can it be modified?

[Grimfate126]

Can it be modified?

that depends.. what do you mean by modified?? like changing the value?? i guess.. ask slasher. ;)

[Electro]

PSP_CTRL_SCREEN = 0x400000
It can only be read in kernel mode.

thanks,,

and is there some way to control the screen brightness?
(without touching the button, or disabling the button to change brightness)

[Maxime]

Well I installed CYGWIN & PSPTOOLCHAIN, and I tried to compil an EBOOT and her's what it said :


Note : if i "make" again then, it creates an eboot that shuts off the PSP :S

[Waterbottle]

Does there exist a cos^-1 function?

Well I installed CYGWIN & PSPTOOLCHAIN, and I tried to compil an EBOOT and her's what it said :


Note : if i "make" again then, it creates an eboot that shuts off the PSP :S

try adding the
PSP_MODULE_INFO("hellowor ld", 0, 1, 1); line.

[LMelior]

Does there exist a cos^-1 function?

How about acos?

EDIT: Congrats on making the 1,000,000th post. :)

[Moonchild]

Does there exist a cos^-1 function?

How about
pow(cos(), -1);
?

[hallo007]

when i tried to make a variabel x , one bigger when you pressed the up button
it goes many numbers up i did this
(note : ofcourse this code wont work , lol)
if (up pressed)
x++

how do you do that it only goes one number up if you pressed the up button , and if you press the up button again it goes another number up

for example
x=1
up button pressed
x=2
up button presse
x=3


now it does this
up button pressed
x=1
x=2
x=3
x=4
x=5
....

thnx in advance

[Grimfate126]

when i tried to make a variabel x , one bigger when you pressed the up button
it goes many numbers up i did this
(note : ofcourse this code wont work , lol)
if (up pressed)
x++

how do you do that it only goes one number up if you pressed the up button , and if you press the up button again it goes another number up

for example
x=1
up button pressed
x=2
up button presse
x=3


now it does this
up button pressed
x=1
x=2
x=3
x=4
x=5
....

thnx in advance

basically you want to check if the button was pressed last frame. this should work:

// Put this outside of your loop //

char upPressed = "false" // This initializes "upPressed" //

// Put this in you main loop //

if (up pressed) {                       // If you press up //
    if (upPressed == "false") { 
        x++;
    }
upPressed = "true"
} else {
    upPressed = "false"
}

[hallo007]

i will repeat it and now write the code ;)
when i tried to make a variabel x , one bigger when you pressed the up button
it goes many numbers up i did this

if(pad.Buttons & PSP_CTRL_UP) {
x++;
}

how do you do that it only goes one number up if you pressed the up button , and if you press the up button again it goes another number up

for example
x=1
up button pressed
x=2
up button presse
x=3


now it does this
up button pressed
x=1
x=2
x=3
x=4
x=5
....

thnx in advance
-= Double Post =-
so if you hold the up button ,it does only one time something
and that's x+1

now if you hold it , it stayes x+1,x+1,...

[Grimfate126]

i will repeat it and now write the code ;)
when i tried to make a variabel x , one bigger when you pressed the up button
it goes many numbers up i did this

if(pad.Buttons & PSP_CTRL_UP) {
x++;
}

how do you do that it only goes one number up if you pressed the up button , and if you press the up button again it goes another number up

for example
x=1
up button pressed
x=2
up button presse
x=3


now it does this
up button pressed
x=1
x=2
x=3
x=4
x=5
....

thnx in advance
-= Double Post =-
so if you hold the up button ,it does only one time something
and that's x+1

now if you hold it , it stayes x+1,x+1,...

have you even TRIED my code?? just try it, it WILL work.

[hallo007]

oke thnx;)
i will tried ,but first get some sleep;)