When your OS goes crazy - Screenshots

[Ycep]

How did you manage to pull off tha--

• Shift 7 → &
• Shift 8 → *

...oh

Very simple.

Code: Select all

getch()
{
 [...]
 if(ShiftPressed)
  return shiftkey[scancode];
 else
  return normalkey[scancode];
 [...]
}

[matt11235]

How did you manage to pull off tha--

• Shift 7 → &
• Shift 8 → *

...oh

Very simple.

Code: Select all

getch()
{
 [...]
 if(ShiftPressed)
  return shiftkey[scancode];
 else
  return normalkey[scancode];
 [...]
}

I think you misunderstood his message.

deleted typed * instead of &, Sik wondered how he managed to do that until he realized that they're next to each other on the keyboard.

[osdever]

Strange bug with TrueType

[BrightLight]

Moved the mouse while the OS was still drawing the window, making it draw an unfinished (and corrupt) back buffer to the display.

[osdever]

Offtop:
I don't see the image. Who sees it?

[Octacone]

Offtop:
I don't see the image. Who sees it?

same I can't see it



omarrx024(your last image)

[BrightLight]

Same image on imgur

[Ycep]

Strange image.
I usually do not post there (I posted only once, and never again) there. You would be suprised when you could see how my OS looks like (negative) in this 30% done-developement stages...

[BrightLight]

Strange image.

It is. It happened because a bug in my window creation function, in which IRQs are allowed to happen. So when the mouse is moved, the OS uses XMM registers to redraw the screen (an SSE memcpy really.) Yet, the graphics code is using the same XMM registers for alpha blending, thus corrupting the state and making weird colors. I should add SIMD context saving to my IRQ handler.

[Brendan]

Hi,

Strange image.

It is. It happened because a bug in my window creation function, in which IRQs are allowed to happen. So when the mouse is moved, the OS uses XMM registers to redraw the screen (an SSE memcpy really.) Yet, the graphics code is using the same XMM registers for alpha blending, thus corrupting the state and making weird colors. I should add SIMD context saving to my IRQ handler.

That's 2 bugs - using SSE within an IRQ handler (for any reason); and touching one device's stuff (video) from a completely unrelated device driver (mouse).


Cheers,

Brendan

[osdever]

Green starfield. Hello to GlauxOS!

[SpyderTL]

Green starfield. Hello to GlauxOS!

I will be genuinly impressed if you tell me that the system is in text mode when this happens.

[osdever]

No, it's 1024x768x32.

[Sik]

On the flipside, once on Windows 98 I got a S3 driver to glitch when switching video modes and I ended up with text mode with an arrow in the middle (and a column of glitch pixels to go along, while we're at it), so it's not exactly an impossible feat.

[osdever]

Wow!