DirectDraw Voxel Engine

[Athlor]

Yet another conversion, I upgraded it to use DirectDraw7 as well. It starts off in a demo mode where it flys across the landscape.

[Athlor]

Here is an alternative Heightmap and Colormap for the DD Voxel Engine.

[drakoh]

hey thx for your work ! I guess a little screenie could bring more people to be interested about it !

[JohnF]

It doesn't work properly on two machines I have. See image, any ideas why?

John

[Athlor]

Do you have directdraw refresh rate changed from the standard 60hz?
You might try recompiling it with a different resolution, like 320x240.
Another thing you might try is forcing a 60 hz refresh rate by changing a parameter in line 245-246 from:

Code: [Select]


  if ((ddrval=IDirectDraw7_SetDisplayMode(DD,SCREEN_WIDTH,SCREEN_HEIGHT,
                                                       SCREEN_BPP,0,0))!=DD_OK)
to:

Code: [Select]


  if ((ddrval=IDirectDraw7_SetDisplayMode(DD,SCREEN_WIDTH,SCREEN_HEIGHT,
                                                       SCREEN_BPP,60,0))!=DD_OK)
As it is it assumes the driver default. It works fine with with my machines. I'm quite puzzled.

[Pelle]

I got the same problem as John, on my newer development machine, but it works on my older test machine.

I tried your suggestions, but no difference here at least...

Pelle

[JohnF]

Forcing the refresh rate did not help just like Pelle reported. It's strange because no other DrirectDraw app has ever caused a problem.

John

[Ngan Lo]

yes, JohnF is right, i having the same problem too.

i havent touch DirectDraw for couple years, since i moved to D3D, i think it's about the memory addressing, the memory pitch (after Locking) seens not correct, b'cuz it may not work on other video cards.  

just a guess, hope this help.  :oops:

[Athlor]

Initially it looked like a refresh problem to me. But now, I think Ngan Lo is right. I'm going to try to address the, ah, memory address problem. I'm sorry to disappoint you but I did only have older machines to test it on.

[JohnF]

Initially it looked like a refresh problem to me. But now, I think Ngan Lo is right. I'm going to try to address the, ah, memory address problem. I'm sorry to disappoint you but I did only have older machines to test it on.

No worries, just make sure you fix it, or else! javascript:emoticon(':wink:')
Wink

John

[Pelle]

Yeah, no problems. I just don't know enough about DirectX to fix it myself...

Pelle

[Ngan Lo]

Hi, Athlor, i just remember the Locking surface rules, u have to use the pitch size (ddsd.lPitch, an offset size of screen memory), b'cuz DDraw is not giving u the exact screen-width when u initial primary/back buffer (i mean different video cards).  :shock:

but i really forgot where to use the pitch size after Locking, sorry...  :oops: