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**Xsjado7** · 04-05-2008, 03:01 AM

Hey,
can anyone suggest an alternative to blitAlphaImageToScreen()? That makes my images go all weird, they dont blit properly, and libGe supposedly supports alpha but i just get white instead or transparency.

**SG57** · 04-05-2008, 04:03 AM

It's probably your images fault ;) And ya theres plenty of alternatives. Oslib, JG++ (i believe thats the name of it i forgot lol), GU, PSPGL, LTE, triEngine, etc. etc.

**Moose** · 04-05-2008, 04:51 AM

As SG57 said, OSLib. It has a good transparency function, but it only supports PNG files I believe.

**Xsjado7** · 04-05-2008, 05:18 AM

Yeah, iv used OSLib before but its more of an engine like those others mentioned

**SG57** · 04-05-2008, 01:00 PM

Moose_Island - What are you talking about... You can either specify a transparency key in code and load a 24 bit image (JPG i believe) and have those parts be transparent or just load a 32 bit image with transparency in it already. As for file format support - PNG, JPG and GIF support.

Xsjado - yes it's an engine, but if your current graphics library is lacking in what you need, you should be smart enough to get a better one or else why even bother? Don't bend over backwards trying to get something done when there are much easier, more efficient methods available.

**Auraomega** · 04-05-2008, 03:01 PM

Zitat von SilverSpring

You don't need to choose your own address, just need to make sure your buffer is 64 Byte aligned.

I'm using malloc, as I'm reading the data.PSP into memory, do I use __attribute__((aligned(64 ))) on the pointer? Like this:

Code:

unsigned char* datapsp __attribute__((aligned(64)));

Zitat von SilverSpring

Yea you need to post the stub, specifically your imports attributes flag. Is your lib for umode or kmode exports, or both? Post your exports attributes flag from your exports file as well then.

Its all usermode, I wasn't aware there was any difference between exports in kernel and user:

(Its all basically graphics.c and intraFont.c functions)

Spoiler for Stub:

Spoiler for Exports:

Thanks again.
-Aura

**cruisx** · 04-05-2008, 05:30 PM

im trying to do collision but i have a prob. I cant seem to move my main sprite so i can check if the 2 other objects have collision. Can someone please help?

Code:

//Oslib header file
#include <oslib/oslib.h>

//This is needed for eboot
PSP_MODULE_INFO("OSLib Sample", 0, 1, 1);
PSP_MAIN_THREAD_ATTR(THREAD_ATTR_USER | THREAD_ATTR_VFPU);

//this creates pointers for our images.
OSL_IMAGE *sprite, *sprite2, *sprite3;

//definations
#define DOWN 0
#define UP 35
#define RIGHT 70
#define LEFT 105

//variables
int sprite_position;
int sprite_march;

//declare the function like buttons and spriteAnimation
void Buttons();
void SpriteAnimate();
int collision(OSL_IMAGE *img1,float img1posX, float img1posY, OSL_IMAGE *img2, float img2posX, float img2posY,OSL_IMAGE *img3, float img3posX, float img3posY );

int main()
{

//start the Oslib library
    oslInit(0);
//start the graphixs mode
    oslInitGfx(OSL_PF_8888, 1);

//sets the transparency color
    oslSetTransparentColor(RGB(255,0,255));

//loads the images into memory
    sprite = oslLoadImageFile("sprite.png", OSL_IN_RAM, OSL_PF_5551);
    sprite2 = oslLoadImageFile("sprite2.png", OSL_IN_RAM, OSL_PF_5551);
    sprite3 = oslLoadImageFile("sprite3.png", OSL_IN_RAM, OSL_PF_5551);

//Disables the transparent color so it cannot be used again
    oslDisableTransparentColor();

//sees if all files are avaiable
    if (!sprite || !sprite2||!sprite3)
        oslDebug("! one or more of the files were missing, the program cannot run");
        
        
//Sets the sprites original position, lets see if i can get 2 sprites on da bloody screen
    sprite->x = 155;
    sprite->y = 95;
    sprite_position = DOWN;

//sets second sprite position
    sprite2->x = 230;
    sprite2->y = 130;
    
//sets thrid sprite pos
    sprite3->x = 270;
    sprite3->y = 130;


//main while loop
    while (!osl_quit)
    {
        //to be able ot draw on the screen
            oslStartDrawing();
            
        //Buttons 
            Buttons();
            
        //draws a green background
            oslDrawGradientRect(0,0,480,272,RGB(0,128,0),RGB(0,128,0), RGB(128,255,128), RGB(128,255,128)); 
            
        //this draws the images to the screen
            oslDrawImage(sprite);
            oslDrawImage(sprite2);
            oslDrawImage(sprite3);
            
        //stops the drawing mode
            oslEndDrawing();
            
        //sync the screen 
            oslSyncFrame();
        }
        
        //terminate the program
        oslEndGfx();
        oslQuit();
        return 0;
    }
    
        void Buttons()
        {
        //starts up the psp buttons
            oslReadKeys();
            
        if (osl_keys->held.down)
        {
            if(!collision(sprite, sprite->x, sprite->y + 2, sprite2, sprite2->x, sprite2->y, sprite3, sprite3->x, sprite3->y  ))
            {
            //sprite movement
            sprite->y +=2;
            
            //sets sprite position on sprite sheet
                sprite_position = DOWN;
            
            //calls sprie animate
                SpriteAnimate();
        }
        }
                
            if (osl_keys->held.up)
        {
            if(!collision(sprite, sprite->x, sprite->y - 2, sprite2, sprite2->x, sprite2->y,sprite3, sprite3->x, sprite3->y ))
            {
                sprite->y-= 2;
                sprite_position = UP;
                SpriteAnimate();
            
        }
        }
        
       if (osl_keys->held.right)
    {
            if(!collision(sprite, sprite->x + 2, sprite->y, sprite2, sprite2->x, sprite2->y,sprite3, sprite3->x, sprite3->y  ))
            {
        sprite->x += 2;
        sprite_position = RIGHT;
        SpriteAnimate();
    }
    }
            
                if (osl_keys->held.left)
    {
        if(!collision(sprite, sprite->x - 2, sprite->y, sprite2, sprite2->x, sprite2->y,sprite3, sprite3->x, sprite3->y  ))
        {
        sprite->x -= 2;
        sprite_position = LEFT;
        SpriteAnimate();
    }
    }
            
               //If a button is not pressed
    if (!osl_keys->held.value) 
    {
    //Start the variable over for when a button is pressed again
        sprite_march = 0; 

        //Sets the sprite's direction
        oslSetImageTileSize(sprite,0,sprite_position,22,35);
    }
}


void SpriteAnimate()
   {    
        //Moves the sprite in the row that it is in
        sprite_march++;

        //Moves the sprite constantly
        oslSetImageTileSize(sprite,(sprite_march * 22),sprite_position,22,35);

        //resets the sprite movement in that row
        if (sprite_march == 6) sprite_march = 0;
    
}
            
        
        int collision(OSL_IMAGE *img1,float img1posX, float img1posY, OSL_IMAGE *img2, float img2posX, float img2posY, OSL_IMAGE *img3, float img3posX, float img3posY ) 
{
   int collision;
   collision = 0;
   float img1width  = img1->stretchX;
   float img1height = img1->stretchY;
   float img2width  = img2->stretchX;
   float img2height = img2->stretchY;
   float img3width = img3->stretchX;
   float img3height = img3->stretchY;
  
   
   if ((img1posX + img1width > img2posX) &&
       (img1posX < img2posX + img2width) &&
       (img1posX + img1width > img3posX)&&
       (img1posX <img3posX + img3width)&&
       (img1posY + img1height > img3posY)&&
       (img1posY < img3posY + img3height)&&
       (img1posY + img1height > img2posY) &&
       (img1posY < img2posY + img2height) ) 
{
{
         collision = 1;               
   }     
   return collision;
}
}

**Xsjado7** · 04-05-2008, 09:13 PM

Zitat von SG57

Xsjado - yes it's an engine, but if your current graphics library is lacking in what you need, you should be smart enough to get a better one or else why even bother? Don't bend over backwards trying to get something done when there are much easier, more efficient methods available.

Yeah, very true. Im gonna get to work on porting my code to OSL. Thanks

**homemister91** · 04-06-2008, 12:43 AM

can some one help me with this error.
luasystem.cpp

.text+0x26bc): undefined reference to `sctrlHENIsSE()'
luasystem.cpp

.text+0x26cc): undefined reference to `sctrlHENIsDevhook()'
luasystem.cpp

.text+0x26fc): undefined reference to `sctrlSEGetConfig(SEConfi g*)'
luasystem.cpp

.text+0x2718): undefined reference to `sctrlSEMountUmdFromFile( char*, int, int)'
luasystem.cpp

.text+0x2734): undefined reference to `sctrlSEMountUmdFromFile( char*, int, int)'
luasystem.cpp

.text+0x279c): undefined reference to `sctrlKernelLoadExecVSHDi sc(char const*, SceKernelLoadExecVSHParam *)'
luasystem.cpp

.text+0x281c): undefined reference to `sctrlKernelLoadExecVSHDi sc(char const*, SceKernelLoadExecVSHParam *)'
luasystem.cpp

.text+0x2874): undefined reference to `sctrlKernelLoadExecVSHMs 2(char const*, SceKernelLoadExecVSHParam *)'
collect2: ld returned 1 exit status
make: *** [luaplayer.elf] Error 1

I get it when compiling. I have referenced the headers needed and added the lib in the make file

&(^&&*T^&*^& DONT WORRY FIXED )&*&^*(&^

**thewastedDOTorg** · 04-06-2008, 11:39 AM

Awesome

**Insert_Witty_Name** · 04-06-2008, 12:00 PM

Zitat von Auraomega

I'm using malloc, as I'm reading the data.PSP into memory

As I stated when you first asked, use memalign.

Code:

memalign(64, size);

**Xsjado7** · 04-06-2008, 01:13 PM

Does anyone know where to find the .tga image for this tutorial?

http://www.psp-programming.com/code/doku.php?id=c

spgu-neheport-lesson5

I got a nehe.tga image of the net but i dont think its the right one because it cant be opened
-= Double Post =-
All good, just got the picture from the NeHe OpenGL texture mapping tut and saved it as a tga with Photoshop

**Jachra** · 04-06-2008, 03:08 PM

Hi,

I have Googled for it and checked several sites, but could not find it. I know that sceKernelExitGame() returns to the VSH. But how do I tell a PSP that it needs to shutdown?

In Pandora the function sceKernelExitGame() reboots the PSP.

**crait** · 04-06-2008, 03:15 PM

This exits the game to the XMB.

Code:

sceKernelExitGame();

I forgot how to shut down. Let me make a quick search.

**GmDude66** · 04-06-2008, 03:43 PM

scePowerRequestStandby() "shuts down" the PSP completely (clearing memory)

scePowerRequestSuspend() shuts down PSP keeping memory intact (resume application later)

**crait** · 04-06-2008, 03:48 PM

Dangit....
I have all my code on my other computer so I had to look it up and I was just about to post it!

**GmDude66** · 04-06-2008, 03:50 PM

:P beat you to the chase lol

**Archaemic** · 04-06-2008, 08:33 PM

It's times like this that I turn to the PSPLink source code. It's very educational. scePowerRequestStandby is how PSPLink does it.

crait: I recognize your avatar. Which movie is it from? I can't remember. Is it Butterfly and Sword?

**crait** · 04-07-2008, 04:54 AM

Zitat von Archaemic

It's times like this that I turn to the PSPLink source code. It's very educational. scePowerRequestStandby is how PSPLink does it.

crait: I recognize your avatar. Which movie is it from? I can't remember. Is it Butterfly and Sword?

Yes, I too look at source code for how to do stuff if someone has used it before.

And nope. Kung Pow! Enter The Fist
But it's originally from Savage Killers AKA Tiger and Crane Fist

**Moose** · 04-07-2008, 06:45 AM

Thread merged with C/C++ Programming Help Thread, it exists for a reason.

**Mr305** · 04-08-2008, 02:29 PM

I know what ntohs,htons,ntohl,htonl do...

But where's the source for these?

It changes byteordering; I would like to peek @ the source.

**SuperBatXS** · 04-08-2008, 05:34 PM

Hey,
I am using this huge line for a file check, and if it fails, display an error:

Code:

if (!menu || !credit1 || !spaceship || !enemy || !bg1 || !bg2 || !blueweapon || !redweapon || !specialweapon || !explosion || !bpickup || !fpickup) { oslDebug("Error: Could not load one or more images"); }

Is there an easier way to do a file check for every png image i load?

Thanks.

**SG57** · 04-08-2008, 06:44 PM

TMNT - If you're going to ask for help, specify the graphics library your using that handles PNG loading.

In anycase, don't do it that way. If you're using oslib 2.10, call this after initialization, it will automatically assert anything you load.

Code:

oslSetQuitOnLoadFailure((int) 1 /* 1 - on, 0 - off */);

Should you be using any other version of oslib or just choose not to use it as you like to manage what you load, not rely on some integrated stuff (like me), use oslAssert(pointer_to_OSL_ resource) Why you do this is to prevent the manual oslDebug stuff, oslAssert automatically triggers a fatal error message box informing you what file couldn't be loaded and gives you the line and source file where it was called (be it not found or not enough memory).

I don't know if you know this or not, but a few things you should know when working with loaded resources. When ever you're loading a resource, always and check if it's already loaded, if it is delete it then load. When working with sounds and music it is automatically stopped then deleted, When unloading resources, always check if it's already loaded and if it is then delete and assign to NULL to prevent false-positives when checking for if it's already loaded.
example:

Code:

// load main menu resources
if (menu_background) // if the menu_background is loaded
  oslDeleteImage(menu_background); // delete it

menu_background = oslLoadImageFile("menu.png", ......); // load our menu background image
oslAssert(menu_background); // check and make sure it loaded

if (menu_music) // if the menu music is already loaded
  oslDeleteSound(menu_music); // delete it, stops automatically if playing

menu_music = oslLoadSoundFile("music.bgm"...); // load menu music
oslAssert(menu_music);

.............

// delete menu resources
if (menu_background)
  oslDeleteImage(menu_background);

menu_background = NULL;

if (menu_music)
  oslDeleteSound(menu_music);

menu_music = NULL;

Why assign to NULL?

Code:

void Menu();
void Game();

OSL_IMAGE *menuBackground = NULL;

void LoadMenuResources()
{
  if (menuBackground) // this is what im talking about
    oslDeleteImage(menuBackground); // this will crash it second time through

  menuBackground = oslLoadImageFilePNG("menu.png", OSL_IN_RAM | OSL_SWIZZLED, OSL_PF_5551);
  oslAssert(menuBackground); 
}

void UnloadMenuResources()
{
  if (menuBackground)
    oslDeleteImage(menuBackground);

  //menuBackground = NULL;
}

void Menu()
{
  LoadMenuResources();

  while(1)
  {
    if x is pressed {
      break;
    }
  }

  UnloadMenuResources();

  Game(); 
}

void Game()
{
  LoadGameResources();

  while(1)
  {
    if x is pressed {
      break;
    }
  }

  UnloadGameResources();

  Menu();
}

int main()
{
  Menu();

  return 0;
}

Obviously that won't compile but you can adapt it to compile and see for yourself.

It will run fine, your menu will work, you can go to the game as well, it's just when you try to leave the game and go back to the menu that you try to load the menu resources that it will crash. This is because when you unloaded the menu resources, you didn't nullify the pointer to the OSL_IMAGE struct that is the menuBackground, so menuBackground doesn't return NULL since it is pointing to an address in memory, so the line in LoadMenuResources() i commented on will crash it upon re-entering the menu (specifically the oslDeleteImage). It will run that first if statement since menuBackground isn't returning null despite it being deleted in the unloading since it is pointing to an address. so it will try to delete the stuff at the address menuBackground is pointing to. Undefined behavior will occur but in 99% of the cases, expect a crash with an address fetch exception.

If you do happen to try it out, uncomment the line where it assigns it to NULL and see the difference.

**SuperBatXS** · 04-08-2008, 07:14 PM

Thanks dude. I will try that tommorow, and give you the results. I only needed the first code though, but thanks for the thorough explaination. I am using OSlib 2.10.

**SG57** · 04-08-2008, 07:38 PM

Still I don't think it nullifies the pointer after deleting, (tried it myself) so if you do any deleting and running through it again, you'll have a problem.

**Auraomega** · 04-09-2008, 08:52 AM

I'm having a few problems with plugins in Project4, only one method has to work and I'm not truely fussed which, but every one I've attempted has failed, just wondering if anyone can help me with the 2 that I still have structured?

I want to load an EBOOT.PBP (or prx for that matter) with arguments:

Spoiler for loadExec:

Spoiler for loadModuleBuffer:

I think I'd prefer to be able to do the latter way, but the former is ok too, as long as I have some way of passing arguments I'll be happy.

Thanks.
-Aura

**Judas** · 04-09-2008, 01:35 PM

Zitat von Auraomega

I'm having a few problems with plugins in Project4, only one method has to work and I'm not truely fussed which, but every one I've attempted has failed, just wondering if anyone can help me with the 2 that I still have structured?

I want to load an EBOOT.PBP (or prx for that matter) with arguments:

Spoiler for loadExec:

Spoiler for loadModuleBuffer:

I think I'd prefer to be able to do the latter way, but the former is ok too, as long as I have some way of passing arguments I'll be happy.

Thanks.
-Aura

I don't know if this will help, or if it's right, but whenever I pass a text argument, I use a pointer.

void load_plugin(char * path) {}

**SuperBatXS** · 04-09-2008, 01:40 PM

Lol, you didn't really have to quote that if you replied right after his post (no offense, your awesome).

**Auraomega** · 04-09-2008, 02:23 PM

Zitat von Judas

I don't know if this will help, or if it's right, but whenever I pass a text argument, I use a pointer.

void load_plugin(char * path) {}

Nope, it shouldn't make a difference as far as I'm aware, although any suggestions are worth noting so I'll have a quick fiddle around with the code to see if that fixes it :)

-Aura

**SuperBatXS** · 04-09-2008, 02:29 PM

Hey,
here is my shooting code:

Code:

/*******************
    Shooting
********************/
//Fresh Shot Ready
if (WeaponTimer < 1)
{
WeaponPosX = SpaceshipPosX + SpaceshipWidth;
WeaponPosY = SpaceshipPosY + 15;
weapondamage = 0;
}

//Fresh Shot Ready
if (FireTimer < 1)
{
WeaponPosX = SpaceshipPosX + SpaceshipWidth;
WeaponPosY = SpaceshipPosY + 15;
weapondamage = 0;
}

//Active Shoot
if (FireTimer > 1) {    
   if ( (FireTimer < 4) && (weaponstatus < 4) ) { WAV_Play(fire1); }
   else if ( (FireTimer < 4) && (weaponstatus > 3) ) { WAV_Play(flame); }
   if (WeaponTimer > 0) {
       if ( (weaponstatus > 0) && (weaponstatus < 4) ) {
       blitimage(WeaponOffsetX, WeaponOffsetY, WeaponWidth, WeaponHeight, Weapon, WeaponPosX, WeaponPosY);
       }
       else if ( (weaponstatus > 3) && (weaponstatus < 7) ) {
       blitimage(WeaponOffsetX, WeaponOffsetY, WeaponWidth, WeaponHeight, Weapon2, WeaponPosX, WeaponPosY);
       }
   weapondamage = weaponpower1;
   }
   FireTimer++;
   WeaponPosX += wspeed1;
}

//Refresh Shooting
if (FireTimer > WeaponDistance)
{
WeaponPosX = SpaceshipPosX + SpaceshipWidth;
WeaponPosY = SpaceshipPosY + 15;
weapondamage = 0;
FireTimer = 0;
WeaponTimer = 1;
}

It works great, but the problem is that i can't have more than one bullet. How am i supposed to allow "rapidfire" or "more than one bullet on the screen" at a time by using only one image?

Thanks. :o

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