int
qDXInterface::DrawPixel (POS position)
{
DDSURFACEDESC2 ddsd;
UCHAR color = rand()%256;
ZeroMemory (&ddsd, sizeof(ddsd));
lpBack->Lock( NULL, &ddsd, DDLOCK_SURFACEMEMORYPTR / DDLOCK_WAIT, NULL );
UCHAR *buffer = (UCHAR *)ddsd.lpSurface;
int lpitch = (int)ddsd.lPitch;
buffer[position.x + position.y * lpitch] = color; // error occurs here
lpBack->Unlock( NULL );
return 1;
}
Stupid STUPID newbie question - DDraw buffer error
Author
The solution to this must be so simple. I feel like an idiot posting this.
Anyways, I have primary and backbuffer surfaces in a flipping chain, now it''s time to mess with the surface by drawing pixels all over the place. Here is the code I have:
1) Don''t lock the surface for each pixel.
Lock surface -> draw all pixels -> unlock surface.
2) Don''t assume your surface lock is successful. Check its return value, and write pixels only when you know the lpSurface value is valid. (DD_OK)
Lock surface -> draw all pixels -> unlock surface.
2) Don''t assume your surface lock is successful. Check its return value, and write pixels only when you know the lpSurface value is valid. (DD_OK)
Author
Sorry forgot to mention that this function is just to see if it works.
The final version of it will be far more optimised.
The_Minister
The final version of it will be far more optimised.
The_Minister
Author
Well I'll be damned.
After ZeroMemory() I added:
And it worked *gasp*.
I also added a primitive error handler. Very primitive.
BTW how do you intergrate them smiley faces into these posts?
The_Minister
Edited by - The_Minister on 4/16/00 6:28:39 AM
After ZeroMemory() I added:
ddsd.dwSize = sizeof(ddsd) And it worked *gasp*.
I also added a primitive error handler. Very primitive.
BTW how do you intergrate them smiley faces into these posts?
The_Minister
Edited by - The_Minister on 4/16/00 6:28:39 AM
All you have to do is type(without spaces and quotes) ": )" for a happy smiley, ": (" for a sad smiley, ": P" for a smiley with his tongue sticking out, "; )" for a smiley that's blinking with one eye. And of course there are other smileys, but these are the ones that come to mind right now.
/. Muzzafarath
Edited by - Muzzafarath on 4/16/00 6:59:09 AM
/. Muzzafarath
Edited by - Muzzafarath on 4/16/00 6:59:09 AM
Thats right Minister, DirectX tends to have size fields as the first 32bits of all it''s structs, so it knows what it is getting. It''s good practice, apparently.
If you don''t specify the size field, then it thinks its getting a zero size structure.
-Mezz
If you don''t specify the size field, then it thinks its getting a zero size structure.
-Mezz
This topic is closed to new replies.
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