Homebrew Can hacking open up the other 400 pixels?

[MyJoyConRunsHot]

I hear quite frequently that the 3DS horizontal screen pixels are 800 rectangular pixels, doubled together by standard software for the 400x240 resolution in 2D mode. But it seems to be under debate weather it might be possible to address the these individual sub-pixels 1:1 to up the resolution. Do you guys think that's possible with hacking or homebrew? what would 800 rectangular pixels even look like on a screen?

 

[frogboy]

I'm pretty sure the purpose of the other 400 pixels is only to make 3D possible, and they don't truly increase the "resolution" in any way.

 

[DinohScene]

Sub pixels are the pixels which make up one actual pixel.
And the actual pixels is what make up an image.
subpixels are just 3 or 4 basic colours.

 

[MyJoyConRunsHot]

I'm pretty sure the purpose of the other 400 pixels is only to make 3D possible, and they don't truly increase the "resolution" in any way.

But if an image was specifically designed so that each colour only cover each sub pixel instead of two, wouldn't it make images clearer even in the slightest?

 

[Cyan]

I'm pretty sure you can increase the image resolution by addressing all 800 pixels in 2D mode.
Street fighter game hasn't an option do disable 3D to increase resolution?

It must be programmed in the game so the game can provide more data to the screen, you can't just disable the 3D using the slider or a hack.
The game must output 800 pixels wide, or else you'll see each vertical lined doubled. You can't display more details on a screen if the game doesn't even have the details.

It's like playing a NES game on WiiU, it's still pixelized, it doesn't create a 1080p game, only the display is 1080 not the streamed image from the game.


Edit:
I was wrong.
Street fighter option is to disable 3D to increase frame rate, but still render in 400*240 (a single screen buffer of 400*240 is used, the second screen use the same pixels)

 

[MyJoyConRunsHot]

I'm pretty sure you can increase the image resolution by addressing all 800 pixels in 2D mode.
Street fighter game hasn't an option do disable 3D to increase resolution?

It must be programmed in the game so the game can provide more data to the screen, you can't just disable the 3D using the slider or a hack.
The game must output 800 pixels wide, or else you'll see each vertical lined doubled. You can't display more details on a screen if the game doesn't even have the details.

It's like playing a NES game on WiiU, it's still pixelized, it doesn't create a 1080p game, only the display is 1080 not the streamed image from the game.

Hmmm, but the key thing is that it IS possible. I mostly meant homebrew and videos from a flashcart or CFW.

 

[Arras]

Hmmm, but the key thing is that it IS possible. I mostly meant homebrew and videos from a flashcart or CFW.

Why would 800x240 videos be useful though? The resolution is probably too weird to be actually useful for something. That said I'm guessing it would be possible, but how hard it is is another matter entirely.

 

[MyJoyConRunsHot]

Why would 800x240 videos be useful though? The resolution is probably too weird to be actually useful for something. That said I'm guessing it would be possible, but how hard it is is another matter entirely.

800x240 may make the screen more crisp. 800 horizontal pixels seems like a pretty big jump when consider the screen size; would result in higher pixel density. Also the bold is another reason I asked. Would the resolution be lopsided or something since it's usually 800x480 for most screens? it can't be that bad.

 

[techboy]

since it's usually 800x480 for most screens?

800x480 has an odd/non-standard 5:3 aspect ratio (is there a monitor that actually supports this without black bars?).

Do you mean 800x600 (4:3 ratio), which used to be a common PC monitor resolution?

As for usefulness, I can't imagine 800x240 being good for many applications.

 

[Yamagushi]

No. You can't view both sets with a single eye. This conversation is utter nonsense.

 

[IMRAN_PETER]

I think, 3DS display is layered LCD. Upper display contains 400x240 & lower contains 400x240. this is a tech which used in creating glassless 3D. So, its may not be like what you people thinking.

 

[profi200]

Have not got it to display 800x240 pixels in 2D mode so far. The 3DS displays some strange shit, but not my black and white pixel rows.

It seems, it doesn't work. Only got shit displayed:

.global _start
.section .boot
.arm
_start:
 
  ldr r0, =0xFFFD6A04
  ldr r1, =0x01000000
  str r1, [r0]
 
  ldr r0, =0xFFFCE45C
  ldr r1, =0xF0002003  @ width = 800, hight = 240
  str r1, [r0]
 
  ldr r0, =0xFFFCE470
  ldr r1, =0x00002042  @ 01000010001000000000000000000000
  str r1, [r0]
 
  ldr r0, =0xFFFCE478
  ldr r1, =0x00000000  @ display first framebuffer
  str r1, [r0]
 
  ldr r0, =0xFFFCE490
  ldr r1, =0x60090000  @ 2400
  str r1, [r0]
 
  ldr r3, =0xFFFCE468
  ldr r3, [r3]
  ldr r0, =0xD0000000
  add r3, r0          @ adress
 
  mov r0, #0
  mov r1, #0x00        @ black
  mov r2, #0xFF        @ white
  mov r4, #0x2D0      @ size of 1 pixel row
  mov r5, #0
 
 
loop1:
  strb r1, [r3, r0]
  add r0, #1
  cmp r0, r4
  bne loop1
  add r3, r4
  mov r0, #0
loop2:
  strb r2, [r3, r0]
  add r0, #1
  cmp r0, r4
  bne loop2
  add r3, r4
  mov r0, #0
  add r5, #1
  cmp r5, #400
  bne loop1
 
  b .

 

[M[u]ddy]

No. You can't view both sets with a single eye. This conversation is utter nonsense.

Yes you can in 2D mode.

Spoiler

 

[MyJoyConRunsHot]

800x480 has an odd/non-standard 5:3 aspect ratio (is there a monitor that actually supports this without black bars?).

Do you mean 800x600 (4:3 ratio), which used to be a common PC monitor resolution?

As for usefulness, I can't imagine 800x240 being good for many applications.

Yeah, my bad, 800x600. Would the aspect ratio of 800x240 be too off, or would the sub pixels being twice as tall as they are wide fix this problem? Also in practicality (horizontally crisp, but vertically full of jaggies)?

 

[MyJoyConRunsHot]

Yes you can in 2D mode.

Spoiler

This.

 

[Foxi4]

To my knowlege, there are three ways of setting up the screen available to developers:

• 2x400x240 in 3D Mode (default)
• 800x240 in 2D Mode (default)
• 400x240 in 2D Mode with a faster framerate (optional) as seen in "Super Street Fighter IV 3D"

The 3D effect is not achieved using sub-pixels - the screen is physically 800x240, there's nothing there to "unlock" so to speak.

 

[profi200]

See my post above.

 

[Foxi4]

See my post above.

You can't display 800x240 in 3D mode - your 3D diode is lit up, so I'm assuming you forgot about that.

EDIT: Consider this - the 3DS creates 3D images using two interlaced 400x240 frames and displaying a paralax barrier on the black and white LCD which is stuck on-top. If you divide the image you want to display into two frames (Frame 1 being rows divisible by 2 and row 0, Frame 2 being rows not divisible by 2) and pass them into the two frame buffers without enabling the barrier, you will effectively display a 800x240 image using said two frames. It's "exploiting the system" a bit, but it does the job.

 

[profi200]

No, that's not a problem. The entire system is freezed and i can set all manually (i can disable the 3D diode, but for that i need to fight with I2C )

According to yellows8 there is currently no way to display 800x240 pixels in 2D mode.

€:
Have not tried to disable parallax (I2C again...), but on a running system the GSP module disables 3D mode, if i disable the parallax barrier.

 

[Foxi4]

No, that's not a problem. The entire system is freezed and i can set all manually (i can disable the 3D diode, but for that i need to fight with I2C )

According to yellows8 there is currently no way to display 800x240 pixels in 2D mode.

Look at your code. You set the frame buffer to 800x240 - that's not possible, a single frame is up to 400x240. Why not try setting up two frame buffers at 400x240 and then trying to display stuff?

Just an idea. Mind you, I know f***-all about ASM or the 3DS's infrastructure, I'm just using common sense based on the 3DS's screen's built.