Homebrew Homebrew Development

[Tjessx]

When should you use gfxSwapBuffers() And gfxFlushBuffers() ?

 

[AlbertoSONIC]

When should you use gfxSwapBuffers() And gfxFlushBuffers() ?

At the end of the main loop

main loop:
-Draw things
-Do things
-Flush and Swap
-Wait for vblank

 

[AlbertoSONIC]

Could someone give me an example of why/when homebrew doesn't boot 100% of the time.

Does it hangs at a certain point or it doesn't boot at all?

 

[Tjessx]

At the end of the main loop

main loop:
-Draw things
-Do things
-Flush and Swap
-Wait for vblank

Forgot to reuse
u8* gfxGetFramebuffer

--------------------- MERGED ---------------------------

Does it hangs at a certain point or it doesn't boot at all?

It has been fixed, it didnt boot at all

 

[AlbertoSONIC]

Forgot to reuse
u8* gfxGetFramebuffer

--------------------- MERGED ---------------------------


It has been fixed, it didnt boot at all

Oh yeah forgot it

Main loop:
-Get FB <---
-Draw things
-Do things
-Flush and Swap FB
-gspWaitForVBlank

 

[zoogie]

Oh yeah forgot it

Main loop:
-Get FB <---
-Draw things
-Do things
-Flush and Swap FB
-gspWaitForVBlank

you have to get framebuffer address every loop iteration?
does it move around on your system? that's pretty weird.

 

[AlbertoSONIC]

you have to get framebuffer address every loop iteration?
does it move around on your system? that's pretty weird.

Mmmm actually, I've never noticed this thing. You're true, this is weird. I've been using this list of operations to do in main loop since my first 3ds homebrew and I brought this error with me for almost 1 year.

The correct thing is:

-GetFB

MAIN LOOP:
-Draw things
-Do things
-Flush and Swap FB
-Wait for VBlank

 

[Tjessx]

Mmmm actually, I've never noticed this thing. You're true, this is weird. I've been using this list of operations to do in main loop since my first 3ds homebrew and I brought this error with me for almost 1 year.

The correct thing is:

-GetFB

MAIN LOOP:
-Draw things
-Do things
-Flush and Swap FB
-Wait for VBlank

IT doesn't matter if yo got a small app.
But in the end it really flickers

 

[AlbertoSONIC]

IT doesn't matter if yo got a small app.
But in the end it really flickers

?

Does your app flicker?

 

[elhobbs]

?

Does your app flicker?

Traditionally, you would wait for vblank before swapping buffers.

 

[Tjessx]

?

Does your app flicker?

I do wait for a vblanc, and since i get fb kn the beginning of the loop, i dont have any flickering or lag anymore. Runs perfectly

 

[AlbertoSONIC]

I do wait for a vblanc, and since i get fb kn the beginning of the loop, i dont have any flickering or lag anymore. Runs perfectly

So you get FB before entering the main loop, right?

 

[Tjessx]

i'll post it in a minute

--------------------- MERGED ---------------------------

So you get FB before entering the main loop, right?

void get_buffers() {
    top = gfxGetFramebuffer(GFX_TOP, GFX_LEFT, NULL, NULL);
    bottom = gfxGetFramebuffer(GFX_BOTTOM, GFX_LEFT, NULL, NULL);
}

int main() {
    bool change = true;
  
    srvInit();
    aptInit();
    hidInit(NULL);
    gfxInitDefault();
    init();
  
    get_buffers();
    while (aptMainLoop())
    {
        gspWaitForVBlank();
        hidScanInput();
      
        u32 kDown;
        kDown = hidKeysDown();
      
        touchPosition touch;
        hidTouchRead(&touch);

        //should actually check keys here
      
        if(change == true || check_keyboard_click(touch)) {
            draw_keyboard(bottom);
            gfxFlushBuffers();
            change = true;
        }

        if(change) {
            draw_menu();
            gfxFlushBuffers();
            gfxSwapBuffers();
            get_buffers();
            change = false;
        }
      
        //check keys
      
        gfxFlushBuffers();
    }

    gfxExit();
    hidExit();
    aptExit();
    srvExit();
    return 0;
}

I'm going to place the //check keys part before the drawing, since everything would appear one tick earlier.

EDIT: Basicly i check if something changes, if it does, i redraw the necessary stuff, flush buffers, swap buffers, and get the buffers

 

[AlbertoSONIC]

I don't understand a things in this piece of code:

if(change == true || check_keyboard_click(touch)) {
draw_keyboard(bottom);
gfxFlushBuffers();
change = true;
}

if(change) {
draw_menu();
gfxFlushBuffers();
gfxSwapBuffers();
get_buffers();
change = false;
}

If "check" is true, the 3ds executes the code inside both the "if":

draw_keyboard(bottom);
gfxFlushBuffers();
change = true; check is already true, otherwise we wouldn't be running this code
draw_menu();
gfxFlushBuffers(); you flush again? Just do it one time!
gfxSwapBuffers();
get_buffers();
change = false;

I don't have the full code but *i think* there's something wrong here...

 

[Tjessx]

I don't understand a things in this piece of code:

if(change == true || check_keyboard_click(touch)) {
draw_keyboard(bottom);
gfxFlushBuffers();
change = true;
}

if(change) {
draw_menu();
gfxFlushBuffers();
gfxSwapBuffers();
get_buffers();
change = false;
}

If "check" is true, the 3ds executes the code inside both the "if":

draw_keyboard(bottom);
gfxFlushBuffers();
change = true; check is already true, otherwise we wouldn't be running this code
draw_menu();
gfxFlushBuffers(); you flush again? Just do it one time!
gfxSwapBuffers();
get_buffers();
change = false;

I don't have the full code but *i think* there's something wrong here...

It's pretty simple actually,
But you don't have the full code,
Instead of the //check here for key presses part, i check if a key is pressed, and if it has been pressed then change = true;

Then, in the next frame.
If something changed (still only keypress), i want to redraw the keyboard, and the menu.

But if nothing changed, i'm gonna check if someone pressed the keyboard in a way something changed, if it does I need to redraw the keyboard + the menu


EDIT: It makes sense if you get the complete code, but the change variable has a wrong name,

 

[AlbertoSONIC]

It's pretty simple actually,
But you don't have the full code,
Instead of the //check here for key presses part, i check if a key is pressed, and if it has been pressed then change = true;

Then, in the next frame.
If something changed (still only keypress), i want to redraw the keyboard, and the menu.

But if nothing changed, i'm gonna check if someone pressed the keyboard in a way something changed, if it does I need to redraw the keyboard + the menu


EDIT: It makes sense if you get the complete code, but the change variable has a wrong name,

Yeah I understood that but...

If change is true, it executes both the if.
If check_keyboard_click(touch) is true, it executes both the if.
If change is false, the two if's code won't get executed.
If check_keyboard_click(touch) is false, the two if's code won't get executed.

This means that those two "if" will behave the same, if one is executed, the other one is executed, if one isn't executed, the other one isn't executed. This means that those if can be merged in only one zip, with change || check_keyboard_click(touch) as condiction!

 

[Tjessx]

Yeah I understood that but...

If change is true, it executes both the if.
If check_keyboard_click(touch) is true, it executes both the if.
If change is false, the two if's code won't get executed.
If check_keyboard_click(touch) is false, the two if's code won't get executed.

This means that those two "if" will behave the same, if one is executed, the other one is executed, if one isn't executed, the other one isn't executed. This means that those if can be merged in only one zip, with change || check_keyboard_click(touch) as condiction!

Good point, I though of that, but it was late will change that, thanks

 

[AlbertoSONIC]

Good point, I though of that, but it was late will change that, thanks

You're welcome!

 

[nop90]

I need help in setting up some libs in devkitpro.

I copied libz, libpng and other libs in devkitpro/portlibs/arm, but don't know what to to now to make them used by the #include <...> statement.

My os is win7

EDIT: solved with makefile on Xerpi github

 

[Tjessx]

I was looking for an example for threads in C.
I found this one. https://github.com/smealum/ctrulib/blob/master/examples/threads/event/source/main.c

Does someone have a better example?
Maybe something with comments.

Also i don't get one thing.

When you press A, shouldn't the counter keep going up?
It only goes up by 1 every time i click it.

svcCreateThread returns 0