Homebrew Homebrew Development

[spinal_cord]

Can someone clue me into how the hell the pixel buffer works? I can either get the colours correct, OR the x,y location, not both. I'm attempting to use --

void drawPixel(int x, int y, char r, char g, char b, u8* screen)
{
    int height=240;
  
    u32 v=((239-y)+x*height)*3;
    screen[v]=b;
    screen[v+1]=g;
    screen[v+2]=r;
}

on the upper screen with console output on the lower screen. However, the pixels are spaced out. If I *2 instead of *3, then the pixels are in the correct place, but the rgb values are wrong.

Little help?

Cheers.

 

[Rinnegatamante]

Can someone clue me into how the hell the pixel buffer works? I can either get the colours correct, OR the x,y location, not both. I'm attempting to use --

void drawPixel(int x, int y, char r, char g, char b, u8* screen)
{
    int height=240;
 
    u32 v=((239-y)+x*height)*3;
    screen[v]=b;
    screen[v+1]=g;
    screen[v+2]=r;
}

on the upper screen with console output on the lower screen. However, the pixels are spaced out. If I *2 instead of *3, then the pixels are in the correct place, but the rgb values are wrong.

Little help?

Cheers.

Nintendo used vertical screens instead of horizontal ones so upper and lower screen in reality are 90 degrees rotated and have 400x240 and 320x240 resolution.

 

[spinal_cord]

Nintendo used vertical screens instead of horizontal ones so upper and lower screen in reality are 90 degrees rotated and have 400x240 and 320x240 resolution.

I'm ok with the rotation, but I\m drawing a full screen pixel-by-pixel but the display is spread out with gaps, both vertical and horizontal.

 

[Rinnegatamante]

Try this one (color is a BGRA color)

void DrawPixel(u8* screen, int x,int y, u32 color){ int idx = (((x)*240) + (239-(y)))*3; *(u32*)&(screen[idx]) = (((color) & 0x00FFFFFF) | ((*(u32*)&(screen[idx])) & 0xFF000000)); }

 

[spinal_cord]

just as bad.

 

[elhobbs]

Are you try to draw a pixel to a screen setup by the console? It uses a packed 16 bit per pixel format. Use RBG8_to_565(r,g,b) to pack the colors into a u16 and use 2 instead of 3 for your multiple.

 

[Tjessx]

So i updated DEVKITARM through the automated installer.
I downloaded the latest ctrulib and did "make install" which was skipped since i got the latest version now.

When i try to build my project i get this error:
/Users/bert/devkitPro/devkitARM/bin/../lib/gcc/arm-none-eabi/4.9.2/../../../../arm-none-eabi/bin/ld: cannot find 3dsx_crt0.o: No such file or directory
collect2: error: ld returned 1 exit status
make[1]: *** [/Users/bert/Documents/Devellopment/3ds/pictochat3ds/pictochat3ds.elf] Error 1
make: *** [build] Error 2

Anyone an idea on how to fix this?

EDIT: in the makefile i had to change: "mfloat-abi=softfp" to "mfloat-abi=hard"

 

[Rinnegatamante]

So i updated DEVKITARM through the automated installer.
I downloaded the latest ctrulib and did "make install" which was skipped since i got the latest version now.

When i try to build my project i get this error:
/Users/bert/devkitPro/devkitARM/bin/../lib/gcc/arm-none-eabi/4.9.2/../../../../arm-none-eabi/bin/ld: cannot find 3dsx_crt0.o: No such file or directory
collect2: error: ld returned 1 exit status
make[1]: *** [/Users/bert/Documents/Devellopment/3ds/pictochat3ds/pictochat3ds.elf] Error 1
make: *** [build] Error 2

Anyone an idea on how to fix this?

EDIT: in the makefile i had to change: "mfloat-abi=softfp" to "mfloat-abi=hard"

First of all, do a make clean.
Secondary, if you used some library, you have to rebuild them with mfloat-abi=hard.

 

[Tjessx]

thanks

 

[spinal_cord]

Is there a [very] simple file browser example around? I just need something to select a file...?

 

[Rinnegatamante]

Is there a [very] simple file browser example around? I just need something to select a file...?

In LUA you can take as sample this lpp-vita script (it's really similar to lpp-3ds syntax: https://github.com/Rinnegatamante/lpp-vita/blob/master/samples/Simple Menu/menu.lua )

 

[elhobbs]

Is there a [very] simple file browser example around? I just need something to select a file...?

This is to select a directory https://github.com/elhobbs/spectre3ds/blob/master/source/Host.cpp look for Host::choose_game_dir
But could be easily changed to a file.

 

[MOBSTER_X]

Is there any example on drawing images to screen? Like flipping through images?

 

[Rinnegatamante]

Is there any example on drawing images to screen? Like flipping through images?

Same as top, do you intend for C/C++ or LUA?

For C/C++ you can see this sample from Aurelio92: https://github.com/Aurelio92/ctrulib/blob/master/examples/graphics/bitmap/24bit-color/source/main.c
For LUA you can see this sample: https://github.com/Rinnegatamante/lpp-3ds/blob/master/samples/image.lua

 

[MOBSTER_X]

Thanks

 

[Garcia98]

How do you debug a homebrew app?

I've written a simple one which works at the beginning but after ~6 seconds it freezes and it doesn't seem to read the input (I can't exit from the app or do anything).

 

[Tjessx]

You cant really debug it.
You could use citra on your pc to try it out though

 

[Garcia98]

You cant really debug it.
You could use citra on your pc to try it out though

The weird thing is that in Citra it works fine (it doesn't freeze after a while)

 

[Tjessx]

If you post your code here we might find the mistake forcyou

 

[hippy dave]

Enable the console on whichever screen you can spare, and print messages to it (eg. successive numbers) between bits of your code so you can see where the crash happens.