First there was GBLUR (very slow)
Then QBLUR (faster, but still slow)
Now I have created IBLUR!
Just run this function once to instantly blur everything on screen. It uses transparent sprites, so you only need to run it once and it will update automatically!
DEF IBLUR R
FOR X=-R TO R
FOR Y=-R TO R
ENDSyntax: IBLUR radius
Caution: using a high radius can cause extreme lag/low FPS
You can use SPCLIP to control the blur area (I might add a better way to do that later)