Hello Tank2k

When your graphics card doesn't support source colorkeys than DirectDraw will emulate it in software. To do this in hardware you have to buy a graphics card which supports that.

VirtualNext

Hi,
it DOES support both destination and source color keying, have a look at your documentation and change the flags. I guess nearly every card built after 1997 should support this, so this doesn't seem to be a problem to me.

It's not possible to do in hardware when your hardware doesn't support it, that's life, but I guess it normally should support it.

CU

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Skullpture Entertainment
#40842461

Thanks, that gives me some hope. I'll look at it again.

BTW, does everything default to software emulation if your hardware
doesn't support it? I remember trying to to use Blt and DDBLTFX to do
some surface stretching, but the function failed on me, so I had to write
it myself to get around it. Should this also be emulated in software?

It was setup like this as I remember it:

ZeroMemory( &ddbltfx, sizeof(DDBLTFX) );
ddbltfx.dwSize = sizeof(DDBLTFX);
ddbltfx.dwDDFX = DDBLTFX_ARITHSTRETCHY;

// Stretch the test_surface to the entire back surface
back_surface->Blt(NULL, test_surface, NULL, DDBLT_DDFX | DDBLT_WAIT, &ddbltfx);

-Tank2k

quote:

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does everything default to software emulation if your hardware doesn't support it?

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No. There are some things that are just too slow in software to make it worth doing. Overlays are one example. For others, you'll have to check the DX documentation.

I got it to work finally. Thanks! (couldn't get DirectX
stretching to work however, oh well).

-Tank2k

I am working on a 2D tile-based game and I would like to create
different player colors for my units like Warcraft II. I thought
I could use 2 different transparency colors, one for the player
color on the unit, and one for the background color around the unit.
I could then blt the player color on the unit surface (using a source
colorkey), and the blt the complete unit to the background (using a
dest colorkey).

However DirectX tells me it does not support source colorkey blts,
only dest colorkey blts!

Well, I really don't want to do this in software, as it would be
simply too slow. Does anyone have advice how I would do this? Is it
still possible in hardware (DirectX)?

-Tank2k

DirectDraw streatching sucks anyways. It doesn't do any filtering, so it looks all blocky.