Print Page - Accum Buffer + Anti-Aliasing Weirdness

Title: Accum Buffer + Anti-Aliasing Weirdness
Post by: Gaara on May 23, 2006, 17:06:23

Hey all. I was trying out some things with the accumulation buffer to have some cool fullscreen motion blur effects and I wanted to have some anti-aliasing to smooth out the edges of the models. Well, heres what I got when I did the accum buffer with 6x anti-aliasing...

(http://www.rit.edu/~jrs8212/lwjgl/accum_buffer_problem.png)

It still runs, but looking like that. I'm not sure if its LWJGL, OpenGL or my ATI card (9800pro). It does work, however, with 4x and below anti-aliasing.

Code for accum buffer to do motion blur:

Code Select

GL11.glAccum( GL11.GL_MULT, .90f );
GL11.glAccum( GL11.GL_ACCUM, .10f );
GL11.glAccum( GL11.GL_RETURN, 1f );

Code for the PixelFormat of the Display with 6x anti-aliasing:

Code Select

Display.create( new PixelFormat( 0, 4, 1, 1, 6, 0, 1, 1, false ) );

Any thoughts?

Title: Accum Buffer + Anti-Aliasing Weirdness
Post by: Matzon on May 23, 2006, 17:17:06

ati doesn't do more than 4x AA ?

Title: Accum Buffer + Anti-Aliasing Weirdness
Post by: Gaara on May 23, 2006, 19:01:15

Ahh, that would explain it. Thanks.

Title: Accum Buffer + Anti-Aliasing Weirdness
Post by: darkprophet on May 23, 2006, 20:48:15

I wouldn't use the accumulation buffer if I was you. Alot of hardware "supports" it, but via software mode.

Much safer to render to texture either using EXT_fbo, pbuffer or just a straight out copy from frame buffer, then make a few fullscreen quads with varying alpha colours and blit the textures onto those textures...

DP

Title: Accum Buffer + Anti-Aliasing Weirdness
Post by: Gaara on May 23, 2006, 21:42:58

Cool, thanks for the advice. I'll have to give that a try.

LWJGL Forum

Programming => OpenGL => Topic started by: Gaara on May 23, 2006, 17:06:23