Homebrew Homebrew Development

[minexew]

I added some direct resource access functions to ctrGL for those who hate pointless mallocs

Explained in detail here: https://github.com/minexew/ctrgl/co...8056#diff-48b24b8a8fbb8d373eb88363e633dc11R36

 

[Nightbane30]

indeed, everything is on 3Dbrew.


yeah, documentation is certainly lacking. however, ctrulib is bundled with a few well-commented examples such as the sdmc example, which should be a good way to get you started with framebuffer rendering : https://github.com/smealum/ctrulib/blob/master/examples/sdmc/source/main.c

Alright, thanks Smea!

 

[xem]

Hello, I'm reading 3Dbrew, and ctrulib's source code too but there are still things that I don't get very well, especially about graphics.

According to http://3dbrew.org/wiki/Memory_layout The VRAM's address range is [0x18000000 - 0x18600000].

Question 1: are the 3 screens' 2 framebuffers stored in the VRAM?
According to the same page (at the bottom), it looks like framebuffers are generally stored between addresses 0x1E6000 and 0x4FF800... are those addresses inside the VRAM (i.e. equivalent to global addresses 0x181E6000 - 0x184FF800) ?

Question 2: If that is right, then why is ctrulib using the addresses 0x000000 - 0x189C00? Did they choose to redefine the default framebuffer's addresses to take less space, or something like that?
https://github.com/smealum/ctrulib/...b052d12ecb19dd1/libctru/source/gfx.c#L98-L105

Question 3: in each framebuffer, are the pixels stored sequencially as r,g,b,r,g,b,,... (1 byte for each color) or do they follow another pattern (like b,g,r,b,g,r,...) ? Or maybe it is BGR by default but it can be changed to support other patterns somehow.

Thanks a lot!

 

[st4rk]

Hello, I'm reading 3Dbrew, and ctrulib's source code too but there are still things that I don't get very well, especially about graphics.

According to http://3dbrew.org/wiki/Memory_layout The VRAM's address range is [0x18000000 - 0x18600000].

Question 1: are the 3 screens' 2 framebuffers stored in the VRAM?
According to the same page (at the bottom), it looks like framebuffers are generally stored between addresses 0x1E6000 and 0x4FF800... are those addresses inside the VRAM (i.e. equivalent to global addresses 0x181E6000 - 0x184FF800) ?

Question 2: If that is right, then why is ctrulib using the addresses 0x000000 - 0x189C00? Did they choose to redefine the default framebuffer's addresses to take less space, or something like that?
https://github.com/smealum/ctrulib/...b052d12ecb19dd1/libctru/source/gfx.c#L98-L105

Question 3: in each framebuffer, are the pixels stored sequencially as r,g,b,r,g,b,,... (1 byte for each color) or do they follow another pattern (like b,g,r,b,g,r,...) ? Or maybe it is BGR by default but it can be changed to support other patterns somehow.

Thanks a lot!

Question 3 : 24bpp, BGR Format, but you can change it to 16bpp and other formats too =]

 

[jasonmbrown]

Figured I would do something simple, and recreate space invaders for the 3ds. Since this is the first C++ Il have done (besides Making HelloWorlds for the wii, and tweaking the examples), I dont have much experience. And was wondering If there's anyone who wants to help with logic error?

Currently, Don't have much done up Besides a simple way to create 8x8 sprites and animate them. I had one of them Moving left and right Just to make sure that there wasnt anything weird happening with the variables. However Now that Im drawing multiple "Invaders" It keeps drawing them diagonally which means I have a logic issue somewhere that I cant find...

if anyone wants to take a look feel free, This has the source as well as the buggy diagonal animated "invader" Besides that I havent done much lol. Just this has taken me all night XD.
Crappy Code.

So Ya If anyone wants to take a quick glance and see where I derped?

(code thats probably causing the issue)

EDIT:Got them to line up, however I cant draw the row above for some reason, Causes buncha weird blue invaders to show up...
(modified the below data)

int alien_layout[121] = {
    1,1,1,1,1,1,1,1,1,1,  1,0,0,0,0,0,0,0,0,0,
    1,1,1,1,1,1,1,1,1,1,  1,0,0,0,0,0,0,0,0,0,
    1,1,1,1,1,1,1,1,1,1,  1,0,0,0,0,0,0,0,0,0,
    1,1,1,1,1,1,1,1,1,1,  1,0,0,0,0,0,0,0,0,0,
    0,0,0,0,0,0,0,0,0,0,  0,0,0,0,0,0,0,0,0,0,
    0,0,0,0,0,0,0,0,0,0,  0,0,0,0,0,0,0,0,0,0,0
};
 
int get_xpos(alien_array_position){//Minimum 100px: Maximum 300px
  int xpos = 0;
  xpos = (150 + (alien_array_position * 13) );//150
 
return xpos;
};
 
int get_ypos(alien_array_position){
    int ypos = 0;
    ypos = (50 + ((alien_array_position /20) * 11) );//100
 
return ypos;
};

I feel like the answer to this is gonna be really stupid lol

Edit2: Yay I figured it out... I was multiplying the alien_array_position * 13 but I needed to ((alien_array_position % 20) *13);

 

[pikatsu]

There is a site with things that can help on gateway loader decrypting

http://wololo.net/talk/viewtopic.php?t=34390

 

[CalebW]

I noticed it's popular to use START to exit homebrew, but why don't we just use the home menu button since that's not used and free start for other things?

 

[minexew]

I noticed it's popular to use START to exit homebrew, but why don't we just use the home menu button since that's not used and free start for other things?

A wild guess would be "because it's not exposed to usermode"

 

[CalebW]

A wild guess would be "because it's not exposed to usermode"

That sucks...

 

[yodamerlin]

Has anyone got some good random seed generation for random numbers?

 

[smealum]

Has anyone got some good random seed generation for random numbers?

https://github.com/smealum/ctrulib/blob/master/libctru/include/3ds/svc.h#L72 should be a good bet.

 

[minexew]

Has anyone got some good random seed generation for random numbers?

Yeah, build a moderately complex 3D scene, turn on stereo rendering and count the seconds until the POS PICA hangs.

Ayy lmao!

 

[yodamerlin]

https://github.com/smealum/ctrulib/blob/master/libctru/include/3ds/svc.h#L72 should be a good bet.

Thanks Smea!

Yeah, build a moderately complex 3D scene, turn on stereo rendering and count the seconds until the POS PICA hangs.

Ayy lmao!

... I won't try that...

 

[shinyquagsire23]

That sucks...

Yeah, I'd personally say the best idea for having an exit "button" would be to have one on the bottom screen like blargSnes. Guessing buttons is no fun.

 

[CalebW]

Yeah, I'd personally say the best idea for having an exit "button" would be to have one on the bottom screen like blargSnes. Guessing buttons is no fun.

Or we(the homebrew community) could just standardize a "soft reset"(like on the DS) key combination, say, like START+SELECT or L+R+START....


Has anybody managed to compile smea's hbmenu? When I try I get

/home/family/Desktop/Caleb/Github/3ds_hb_menu/source/background.c:74:31: error: 'RAND_MAX' undeclared (first use in this function)
  return (float)rand()/(float)(RAND_MAX);

How come RAND_MAX is undeclared? I greped the entire source tree for RAND_MAX but nothing showed up...

 

[filfat]

Quick question, how do I configure SD support for 3dmoo?

 

[shinyquagsire23]

Or we(the homebrew community) could just standardize a "soft reset"(like on the DS) key combination, say, like START+SELECT or L+R+START....


Has anybody managed to compile smea's hbmenu? When I try I get

/home/family/Desktop/Caleb/Github/3ds_hb_menu/source/background.c:74:31: error: 'RAND_MAX' undeclared (first use in this function)
  return (float)rand()/(float)(RAND_MAX);

How come RAND_MAX is undeclared? I greped the entire source tree for RAND_MAX but nothing showed up...

It's probably a defined variable in ctrulib. Did you make sure to update ctrulib and create an environment variable CTRULIB to point to the libctru folder?

 

[Arisotura]

A wild guess would be "because it's not exposed to usermode"

Actually, it is exposed to user mode, more or less.

The APT service lets you sense when it is pressed. The app is then supposed to do some operations that bring it to the background and show the home menu, but I guess one could program it to do something else.

ctrulib hides those details from the user, though.


This shit also doesn't work under Ninjhax.

 

[shinyquagsire23]

Actually, it is exposed to user mode, more or less.

The APT service lets you sense when it is pressed. The app is then supposed to do some operations that bring it to the background and show the home menu, but I guess one could program it to do something else.

ctrulib hides those details from the user, though.


This shit also doesn't work under Ninjhax.

Yeah, I imagined it was there. I might poke around and see what ctrulib's button value fetcher thingy is actually returning when I press the home button, because it might just be a matter of non-implemented details (like the 3D slider thing which is only documented in one of the examples).

EDIT: Definitely not picked up like a normal button.

 

[Arisotura]

I already tried that before. No bits in the HID button values are set when the Home button is pressed.

The only way to sense presses to that button (and the Power button) is APT. APT_Initialize() gives you event handles, one of them is signaled when those buttons are pressed (among other things).