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+--- Thread: Full-Screen SDL alpha blending (/thread-7200.html)
Full-Screen SDL alpha blending - SSC - 05-08-2005
I can do alpha preblending with small areas just fine, but when I try to do something fullscreen it slows down to less than .5 FPS, even when I use SDL_DisplayFormatAlpha(image) I can still only get 1.5 FPS, it seems to me that I should be able to get more power out of SDL, any ideas?
Full-Screen SDL alpha blending - Z!re - 05-08-2005
Dont do realtime blending, it'll always be slow.
If you really really want to do blending, use openGL, it's faster and better at stuff like that.
Full-Screen SDL alpha blending - SSC - 05-08-2005
Like I said, I am preblending, but trying to do the whole screen and its slow...
Full-Screen SDL alpha blending - Z!re - 05-08-2005
Well, pre-blening means you blend all surfaces that'll ever need to be blended into a new surface, thats not blended, then just blit the new surface whenever you need a "blended" one.
It takes tons of memory, but SDL is just too slow for realtime blending.
And 0.5fps sounds ok, it depends on the size of the surface, so, larger surface = slower.
Full-Screen SDL alpha blending - SSC - 05-08-2005
OGL can be used with SDL right? is there anyway to make SDL faster by using some of the OGL commands without going fully to OGL?
Full-Screen SDL alpha blending - Z!re - 05-08-2005
No, not really sadly.
Full-Screen SDL alpha blending - ShadowWolf - 05-09-2005
SDL doesn't really work with openGL all's it does is gives you a easy way to setup openGL window.
Full-Screen SDL alpha blending - Dr_Davenstein - 05-10-2005
That just depends on how you define *work*.
I mean you can use the SDL keyboard/mouse/joystick/image loading, etc.. while you're in an OpenGL window. There's also a really easy way to do 2D gfx wth it. I'll make a little demo, unless someone else knows of one that already exsists for FB.
Full-Screen SDL alpha blending - Sterling Christensen - 05-10-2005
glSDL is an SDL/OpenGL wrapper that will automatically create and use OpenGL textures for your sprite surfaces. It should be a lot faster for alpha transparency.