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AtomicAcidbath / Glide64

Automatically exported from code.google.com/p/glidehqplusglitch64
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Screenshot creates color blotches for white color/smoke effect #104

Open GoogleCodeExporter opened 9 years ago

GoogleCodeExporter commented 9 years ago 
It seems screenshot color has degraded after the upgrade of lpng.  It is 
especially obvious when it is white color (see attached images & AeroFighters 
Assault screenshot).

Is it a problem with the new lpng or something can be done for screenshot in 
png format?

Original issue reported on code.google.com by pokefan0...@gmail.com on 20 Jun 2010 at 5:23

Attachments:

GoogleCodeExporter commented 9 years ago 
I have tested with jpeg & bmp format for the screenshot and it shows the same 
color blotches (same result on Mupen64).

I use 1964Video to take same screenshot in bmp format(convert to jpg) and it 
looks good (see image1&3).  The effect is greyish.

Original comment by pokefan0...@gmail.com on 21 Jun 2010 at 4:39

Attachments:

GoogleCodeExporter commented 9 years ago 
Glide64 uses wxWidgets to create image files. As I know, wxWidgets uses its own 
code to work with various image formats, so upgrade of lpng should not affect 
it. I did not update wxWidgets for several month. So, the problem is really odd.

Original comment by gon...@ngs.ru on 21 Jun 2010 at 6:21

GoogleCodeExporter commented 9 years ago 
[deleted comment]
GoogleCodeExporter commented 9 years ago 
[deleted comment]
GoogleCodeExporter commented 9 years ago 
[deleted comment]
GoogleCodeExporter commented 9 years ago 
Just attaching 2 screenshot from TWINE showing color blotching on parts of the 
flag with black bg and parts of the suit with greyish bg or something.

Original comment by pokefan0...@gmail.com on 28 Jun 2010 at 8:16

Attachments:

GoogleCodeExporter commented 9 years ago 
If it is normal or can't be fixed, please proceed to close as invalid.
Thanks

Original comment by pokefan0...@gmail.com on 11 Jul 2010 at 7:43

GoogleCodeExporter commented 9 years ago 
If you look at image01(plugin screenshot), there are the polygons drawn around 
the sun which is clearly visible.

In image02(window screen print) at the same location during gameplay, the 
polygons are clearly suppressed/masked off by the plugin.

It seems to me that screenshot is not the same as window screen print which is 
the exact screen display.  Is it possible to do what window screen print is 
doing?

Original comment by pokefan0...@gmail.com on 11 Jul 2010 at 9:43

Attachments:

GoogleCodeExporter commented 9 years ago 
I guess I know what causes these color blotches. Glide64 uses glide3x API 
functions to read frame buffer content to main memory. It's ok for 3dfx cards, 
the content of the buffer returned as is, without any information loss. The 
problem is that in many cases I use 16bit frame buffer with 3dfx cards. 
Voodoo1-3 do not support 32bit rendering at all. On voodoo5 I also use 16bit fb 
for games which use HWFBE because of small amount of available video memory. 
The wrapper always renders in 32bit mode, but when frame buffer read functions 
are used it converts the read buffer to 16bit to safely pass it to the plugin, 
thus quality of screen shots degraded.

Original comment by gon...@ngs.ru on 12 Jul 2010 at 4:42

GoogleCodeExporter commented 9 years ago 
[deleted comment]
GoogleCodeExporter commented 9 years ago 
Both read from video card's frame buffer. ReadScreen passes the data to the 
emulator, while the code in the newSwapBuffers stores it in the screen shot 
file.

Original comment by gon...@ngs.ru on 18 Jul 2010 at 5:23

GoogleCodeExporter commented 9 years ago

Original comment by gon...@ngs.ru on 11 May 2011 at 11:50