nanogui: framebuffer endianess
Subject:
Re: [nanogui] framebuffer endianess
From:
"Greg Haerr" ####@####.####
Date:
22 Jan 2008 02:27:30 -0000
Message-Id: <0c4701c85c9e$4eec5b40$0300a8c0@RDP>
> You've got a "BIGENDIAN" choice in config-file. Tried that?
That won't affect framebuffer writes, instead it's used to
determine whether to byteswap data read from disk.
> I grep'ed over the complete code and did not find a place where wswap is
> used
to swap any access to the framebuffer. The swapping macros are only used
when
handling .bmp images.
The 16bpp driver is src/drivers/fblin16.c. Write a swap macro
before the word is written to the framebuffer and you should
be on your way. See the nibble swapping in drivers/fblin4*.c
for ideas.
Regards,
Greg
For further testing I wrote a little tool that maps the framebuffer memory
and runs over every pixel, does a 16bit read, swaps the pixel and writes it
back.
In the end my colors look as expected. So it's definetely a swapping issue.
Matthias
>
>
