Archived

This topic is now archived and is closed to further replies.

Problems with video cards in DX5

This topic is 6678 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

This is a very common problem.

A video card either represents RGB by 565 bit or 555 bits.( Although there might be other).

So when u start, u need to extract information using GetSurfaceDesc to get the pixel format. Then u create a macro that shifts into bits correctly and use the macro instead of RGB(r,g,b).

There are articles on that problem either here or at www.perplexed.com/GPMega. I know, cause I got my solutions there.

Share this post


Link to post
Share on other sites
Hi everybody!

Thanks to VOID for the immediate answer, it helped me a lot, but another problem arised.
Now i am testing the game in various configuration, and it does not work with Vodoo3 card. Nothing can be seen in the display, and there are no error messages.
Has anybody seen this problem ?
Please answer !

Share this post


Link to post
Share on other sites
The shifting operator shpuld be like:

for 565: ((r >> 3) << 11), ((g >> 3) << 5), (b >> 3)

for 555, the r is only different
((r>>3)<<10)

I believe...damn, colege is cnfusing..

------------------
Dance with me......

Share this post


Link to post
Share on other sites
I see a problem here. 16-bit "565" has 6 bits on the green channel. That means your conversion from 24 to 16-bit "565" should shift the green only twice. This means that I am pretty sure the conversions are like so:

for 565: ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3)
for 555: ((r >> 3) << 10) | ((g >> 3) << 5) | (b >> 3)

Please let me know if I am wrong...

------------------

-Kentamanos

Share this post


Link to post
Share on other sites
Hi !

Please help me. I created a little game, using DirectDraw in DX5. The resolution is 800 x 600 x 16 bpp.
At home I have a TSENG ET 6000 video card and everything is OK, but one of my friend has S3 Trio 2/3D AGP video card. Using this card, the 16 bpp mode does not work, the picture is awfull ( colors are messy), only the 15 bpp mode works.
Please help me what is wrong, how I can determine the type of the video card to use the appropriate code, or tell me anything useful to fix this problem.
ThanX!!

Share this post


Link to post
Share on other sites