Transparent stuff
October 29, 2000 11:50 AM
I know this is not directly ogl related, but, lets ask anyway ...
I am making a configurator utlity for a gl project, I want it to look HI TECH, and not square.
How do I have a partially transparent window, like, based on a BlacknWhite image ? Les''t say I want a complex shape, with curves and stuff which is not possible to delimitate all points (that''s why I want it based on an image) ?
(you can find me on IRC : #opengl on undernet)
116
October 29, 2000 12:02 PM
alpha blending.
glEnable(GL_BLEND);//or something like that, don''t really remember
glColor4f(r,g,b,a);
JoeMont001@aol.com
www.polarisoft.n3.net
glEnable(GL_BLEND);//or something like that, don''t really remember
glColor4f(r,g,b,a);
JoeMont001@aol.com
www.polarisoft.n3.net
My HomepageSome shoot to kill, others shoot to mame. I say clear the chamber and let the lord decide. - Reno 911
October 29, 2000 02:43 PM
That''s not the question
I of course know how to blend gl stuff,
Blending in gl is only about the window content, not the window itself
Let''s reask the question
Of course, as my configurator is up to setup the renderer, it does not uses gl itself, but pure win32 api
I of course know how to blend gl stuff,
Blending in gl is only about the window content, not the window itself
Let''s reask the question
Of course, as my configurator is up to setup the renderer, it does not uses gl itself, but pure win32 api
(you can find me on IRC : #opengl on undernet)
122
October 29, 2000 04:36 PM
Although I''m really no expert at Window$ programming, I think you should use some kind of build in Window$ functions, although I don''t know if you would still be able to render in that window with OpenGL (if that''s what you want to do anyway).
Prosser: But the plans were on display.Arthur Dent: On display? I eventually had to go down to the cellar.Prosser: That's the display department.Arthur Dent: With a torch.Prosser: The lights had probably gone.Arthur Dent: So had the stairs.Prosser: But you did see the notice, didn't you?Arthur Dent: Oh, yes. It was on display in the bottom of a locked filing cabinet stuck in a disused lavatory with a sign outside the door saying "Beware of the Leopard." Ever thought of going into advertising?
October 29, 2000 04:55 PM
MMmh, but which function ???(and no, I don''t want gl render in it)
(you can find me on IRC : #opengl on undernet)
145
October 29, 2000 08:13 PM
Hey SK,
Check out the functions TransparentBlt(...) and AlphaBlend(...) ...I haven''t used them myself (I just looked them up on MSDN), but I can tell you that the first is for colour-keying, and the second is for images with an alpha channel.
Hope that helps
------------------------------------------------------
"You need a weapon. Look around you... can you construct some sort of rudimentary lathe?"
- Guy Fleegman, Security Officer, NSEA Protector
Check out the functions TransparentBlt(...) and AlphaBlend(...) ...I haven''t used them myself (I just looked them up on MSDN), but I can tell you that the first is for colour-keying, and the second is for images with an alpha channel.
Hope that helps
------------------------------------------------------
"You need a weapon. Look around you... can you construct some sort of rudimentary lathe?"
- Guy Fleegman, Security Officer, NSEA Protector
529
October 30, 2000 02:33 AM
like u say this has got nothing to do with gl, your best bet would be looking in msdn or one of the windows sdk''s, information about creating a transparent window
http://members.xoom.com/myBollux
http://members.xoom.com/myBollux
122
October 30, 2000 10:16 AM
SK, there has been an article about this in
(german) PCMAGAZIN 2/00. If you''re interested,
i''d could mail you the sources for 2 programs
(vc6, projects&exe, full compilable), size
is 120k...
arno@hangelar.de
(german) PCMAGAZIN 2/00. If you''re interested,
i''d could mail you the sources for 2 programs
(vc6, projects&exe, full compilable), size
is 120k...
arno@hangelar.de
October 30, 2000 10:42 AM
you want to use regions. I think the API calls are something like
CreateRectRgn
CombineRgn
SelectObject
and there are other Create*Rgn for createing round regions, polygonal regions, etc. CombineRgn allows you to take 2 regions and combine them using logical operations (and, or, xor, etc.). SelectObject allows you to apply a constructed region to a window.
CreateRectRgn
CombineRgn
SelectObject
and there are other Create*Rgn for createing round regions, polygonal regions, etc. CombineRgn allows you to take 2 regions and combine them using logical operations (and, or, xor, etc.). SelectObject allows you to apply a constructed region to a window.
October 30, 2000 11:19 AM
There''s a way you can specify a shape that isn''t made from rectangles - look at the mp3 player sonique...
don''t ask me how it''s done tho, i only do opengl!
been doing more win32 stuff lately though - not that bad really when you start getting into it.
- peter
peter@digital-animations.com
don''t ask me how it''s done tho, i only do opengl!
been doing more win32 stuff lately though - not that bad really when you start getting into it.
- peter
peter@digital-animations.com
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