Different Transparency
Hello everyone,
I've put together a type of transpareny that I think would
be very useful if it can be implimented. But I seem to be
having troubles getting it working, or even figuring out
how to get it working. Some input from you guys would be
appritiated.
Ok, here is what I'm trying to do. For each pixel, there
would be an additional value called height. So instead of
just RGB, each pixel would be RGBH. The transparent routine
would consider a pixel transparent and not place it if the
current pixel's H is greated than its own. I'm sure you see
the benifit, you would have a sort of home-made 256 different
buffers, all in one. It will be especially useful in my isometic
game program (which is coming along nicely) because instead of
repinting all the graphics that may overlap a sprite, there is
already a 'height' and in the isometric view, anything higher
gets priority.
Here's a few ways I've thought about doing this, but failed at.
1) Edit the dibs to have 4 pixels a color instead of 3. Then
have my machine code test the low byte's and only copy when
soure's is higher than destinations. This works out great until
I try to get it onto the screen, and then the delay of switching
it back over to 3 byte per pixel mode give me unacceptable delays.
Or am I just doing it wrong? I think there might be an easier way
then actually switching it back. Wouldn't this be even faster than
existing trasparency routines since you only have to check one byte
equal to or greater than rather than a 3 byte equal to? I don't know.
2) Allocate a second block for each dib containing all of the
H data so as to keep the original dib intact. The problem here is
that my machine / assembler isn't good enough for the task of
keeping track of four addresses and copying into two in any sort
of quick manner, if it is even possible.
Are there any other ways to do this? Am I re-inventing the wheel
and has someone else done this? Is this not practical? Should I
abandon the idea? Am missing something simple that would make
this easier? Any comments would be appritiated.
- Damien Black
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