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Alpha blending problems

Started by MrBeaner Sep 19, 2006 at 2:50 PM 1 reply 750+ views

Original Post

Sep 19, 2006 at 2:50 PM

i am trying to copy some images using stretchrect()from a file that has an alpha channel, but i get white where the alpha should be. i am loading a png file. i am enabling the render states, but i think it might be different because i am copying directly to the back buffer. How do i load and use alpha information for copying directly to the back buffer?

jollyjeffers

245

jollyjeffers

Sep 19, 2006 at 3:09 PM

As far as I'm aware you can't do what you're attempting. The direct-to-backbuffer methods are more for direct memory copying/writing rather than actual rendering.

If you're coming from a DirectDraw background then bare in mind that (ab)using Direct3D in the same way isn't a good idea [smile]

Can't you pack your data as a texture and render it normally?

hth
Jack

MrBeaner

Author

MrBeaner

Sep 19, 2006 at 3:21 PM

Thanks for the reply-

is that what i should do? I am just making a title screen. should the buttons just be billboards or point sprites?

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