Homebrew [HOMEBREW] 3DS Paint [UPDATE][2.0][NEW]

AlbertoSONIC · Nov 20, 2014

3DS Paint

Today i introduce you to my latest 3DS Homebrew: 3DS Paint! With this app you can draw anything you want, with 7 colors and an eraser! You can also save your drawing to the SDCARD! (.bmp image output) You can find some instructions on the 3DS's top screen!

How to install:

You can install this app in many ways. As a Gateway's 3ds file, as a .cia file, it's also ready for SSSPwn! You can find files below!

Screenshots:

MAIN SCREEN:

ABOUT POPUP:

DEBUG POPUP:

PAINT SCREEN:

CLEAR SCREEN POPUP:

EXIT POPUP:

DRAWING SAVED!!

HERE'S THE SAVED DRAWING:
https://www.dropbox.com/s/mssno9rkp13vy4p/3dspaint_drawing_01342922.bmp?dl=0

Bugs:

- There's a small undrawable corner around the the touchscreen.

Downloads:

Precompiled Files, ready to install: Link
Github Repo: Link

ChangeLog:

New 2.0 update brings:
- Whole app rewritten
- Now it exit without crashing, fully working on both NINJHAX and GATEWAY
- Much smoother (30fps)
- Debug features
- A main menu!
- Now you can save your drawings to SDCARD (.bmp image output)!
- HUGE performance improvement
- Less load for 3DS's ARM11 cpu
- Developed and built with latest CTRULIB
- New icon!
- Now using an UI framework!
- "Pop" sound when changing color! (Only for ninjhax users)
- New font!
- Screen Flickering fixed!
. Huge bugfix!

Credits:

Relys
filfat
Bond697
Screenshot feature (needed for saving) taken from BlargSnes

Vengenceonu · Nov 20, 2014

Homebrew Drawn penises incoming!

Relys · Nov 20, 2014

Very nice. Clean example. Well documented.

One thing I would recommend is using camelCase (https://en.wikipedia.org/wiki/CamelCase) for function names with the first word lowercase.

Code:

int fooBar() //camel case.
{
    int someNumber=0; //Same idea for variables.
    return someNumber;
}

It really helps the readability and most C/C++ developers conform to this in their coding style standard (just look at ctrulib for example).

filfat · Nov 20, 2014

Nicely done! I will for sure look into that code while working on front end stuff for the 3DS

memomo · Nov 20, 2014

works great

thanks

AlbertoSONIC · Nov 20, 2014

Relys said:
Very nice. Clean example. Well documented.

One thing I would recommend is using camelCase (https://en.wikipedia.org/wiki/CamelCase) for function names with the first word lowercase.

Code:

int fooBar() //camel case. { int someNumber=0; //Same idea for variables. return someNumber; }

It really helps the readability and most C/C++ developers conform to this in their coding style standard (just look at ctrulib for example).

So, printbottombackgnd() should be printBottomBackgnd()?

gamefan5 · Nov 20, 2014

Nice... I wonder if it will support layers and other things at a later date. XD

Relys · Nov 20, 2014

AlbertoSONIC said:
So, printbottombackgnd() should be printBottomBackgnd()?

Yeah that's correct. It just helps readability and is a good habit to get into.

AlbertoSONIC · Nov 20, 2014

gamefan5 said:
Nice... I wonder if it will support layers and other things at a later date. XD

First i'd like to find a way to output an image of the painting to the sdcard! But i think it won't be that easy...

filfat · Nov 20, 2014

Relys said:
Yeah that's correct. It just helps readability and is a good habit to get into.

Another tip would be naming structs like this "structNameHere_s" and naming local vars either "nameHere_l" or "_localVar"

jocopoco · Nov 20, 2014

dont worry for letter case, Im using also -_-

filfat · Nov 20, 2014

AlbertoSONIC said:
First i'd like to find a way to output an image of the painting to the sdcard! But i think it won't be that easy...

Shouldn't be too hard:
http://stackoverflow.com/questions/13745093/a-portable-function-to-create-a-bmp-file-from-raw-bytes
https://github.com/smealum/ctrulib/tree/master/examples/sdmc

gamefan5 · Nov 20, 2014

AlbertoSONIC said:
First i'd like to find a way to output an image of the painting to the sdcard! But i think it won't be that easy...

hahaha, baby steps man. One thing at a time XD

AlbertoSONIC · Nov 20, 2014

Relys Just updated github repo, now functions names uses CamelCase. Guys you don't need to download another file, these changes doesn't affect the user experience at all!

Cid2mizard · Nov 20, 2014

Strange 131Mo for your .3ds build !!!

AlbertoSONIC · Nov 20, 2014

Cid2mizard said:
Strange 131Mo for your .3ds build !!!

I know... I'm using a modified rsf file that output a 128 mb file. That's because of my Gateway's SPI Failure. Default rsf up in a minute

EDIT: Repo updated!

ernilos · Nov 20, 2014

You should use a line drawing algorithm between drawing points ;_;

AlbertoSONIC · Nov 20, 2014

ernilos said:
You should use a line drawing algorithm between drawing points ;_;

Tell me more about that...

Relys · Nov 20, 2014

Here's an example of loading an image from the sd card to the screen: https://github.com/smealum/ctrulib/blob/master/examples/sdmc/source/main.c

Here I am attempting to reverse that process to write framebuffer to allocated buffer in memory and then write to file on sd card.

Code:

    fsInit(); //needed for filesystem stuff
    u8* buffer;
    u64 size;
    u32 bytesWritten;
    Handle fileHandle;
    //setup SDMC archive
    FS_archive sdmcArchive=(FS_archive){ARCH_SDMC, (FS_path){PATH_EMPTY, 1, (u8*)""}};
    //create file path struct (note : FS_makePath actually only supports PATH_CHAR, it will change in the future)
    FS_path filePath=FS_makePath(PATH_CHAR, "/test.bin");
 
    //open file
    Result ret=FSUSER_OpenFileDirectly(NULL, &fileHandle, sdmcArchive, filePath, FS_OPEN_CREATE, FS_ATTRIBUTE_NONE); //RELYS: Changed FS_OPEN_READ to FS_OPEN_CREATE. Not sure if FS_ATTRIBUTE_NONE needs to be changed to FS_ATTRIBUTE_ARCHIVE
    //check for errors : exit if there is one
    if(ret)goto exit;
 
    //get screen size
    size=320*240*3; // RELYS: x resolution * y resolution * 3 colors per pixel
 
    //allocate a buffer on linear heap (could just be a malloc fwiw)
    buffer=linearAlloc(size);
    if(!buffer)goto exit;
 
    //copy lower screen to buffer
    memcpy(buffer,gfxGetFramebuffer(GFX_BOTTOM, GFX_BOTTOM, NULL, NULL), size);
 
    //Write contents
    ret=FSFILE_Write(fileHandle, &bytesWritten, 0x0, buffer,FS_WRITE_FLUSH); //RELYS: Not sure if we want to use FS_WRITE_FLUSH or FS_WRITE_NOFLUSH
    if(ret || size!=bytesWritten)goto exit;
 
    //close the file because we like being nice and tidy
    ret=FSFILE_Close(fileHandle);
    if(ret)goto exit;
 
    //cleanup and return
    //returning from main() returns to hbmenu when run under ninjhax
    exit:
    //closing all handles is super important
    svcCloseHandle(fileHandle);

I also noticed in the example that they use this for rendering. Maybe we should be using gfxSwappBuffersGPU and gspWaitForEvent???

Code:

        renderEffect();
        //wait & swap
        gfxSwapBuffersGpu();
        gspWaitForEvent(GSPEVENT_VBlank0, false);

AlbertoSONIC · Nov 20, 2014

Relys said:

https://github.com/smealum/ctrulib/blob/master/examples/sdmc/source/main.c

Code:

    fsInit(); //needed for filesystem stuff
    [FONT=Consolas][COLOR=#333333]u8* buffer;[/COLOR][/FONT]
    u64 size;
    u32 bytesWritten;
    Handle fileHandle;
    //setup SDMC archive
    FS_archive sdmcArchive=(FS_archive){ARCH_SDMC, (FS_path){PATH_EMPTY, 1, (u8*)""}};
    //create file path struct (note : FS_makePath actually only supports PATH_CHAR, it will change in the future)
    FS_path filePath=FS_makePath(PATH_CHAR, "/test.bin");
 
    //open file
    Result ret=FSUSER_OpenFileDirectly(NULL, &fileHandle, sdmcArchive, filePath, FS_OPEN_CREATE, FS_ATTRIBUTE_NONE); //RELYS: Changed FS_OPEN_READ to FS_OPEN_CREATE. Not sure if FS_ATTRIBUTE_NONE needs to be changed to FS_ATTRIBUTE_ARCHIVE
    //check for errors : exit if there is one
    if(ret)goto exit;
 
    //get screen size
    size=320*240*3; // RELYS: x resolution * y resolution * 3 colors per pixel
 
    //allocate a buffer on linear heap (could just be a malloc fwiw)
    buffer=linearAlloc(size);
    if(!buffer)goto exit;
 
    //copy lower screen to buffer
    memcpy(buffer,gfxGetFramebuffer(GFX_BOTTOM, GFX_BOTTOM, NULL, NULL), size);
 
    //Write contents
    ret=FSFILE_Write(fileHandle, &bytesWritten, 0x0, buffer,FS_WRITE_FLUSH); //RELYS: Not sure if we want to use FS_WRITE_FLUSH or FS_WRITE_NOFLUSH
    if(ret || size!=bytesWritten)goto exit;
 
    //close the file because we like being nice and tidy
    ret=FSFILE_Close(fileHandle);
    if(ret)goto exit;
 
    //cleanup and return
    //returning from main() returns to hbmenu when run under ninjhax
    exit:
    //closing all handles is super important
    svcCloseHandle(fileHandle);

I also noticed in the example that they use this for rendering. Maybe we should be using gfxSwappBuffersGPU and gspWaitForEvent???

Code:

        renderEffect();
        //wait & swap
        gfxSwapBuffersGpu();
        gspWaitForEvent(GSPEVENT_VBlank0, false);

I noticed it too! May be usefull...

Homebrew [HOMEBREW] 3DS Paint [UPDATE][2.0][NEW]

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