Spritemasks

I want to mask a sprite, but I don't want to mask it in pure black(255,255,255). I know there's ways to change the masked color with 2d images, but I couldn't figure out how to do it with sprites. Any ideas? (thanks)

Look at MaskImage in the docs

Let's say your prefered Mask Color is green, $00FF00, you would need to do the following:

sprite=createsprite()
tex=loadtexture("tex.bmp",4)
entitytexture sprite,tex
setbuffer texturebuffer(tex)
lockbuffer()
for j=0 to textureheight(tex)-1
 for i=0 to texturewidth(tex)-1
  rgb=readpixelfast(i,j) and $FFFFFF
  if rgb=$00FF00 then
   al=$0
  else
   al=$FF000000
  endif
  writepixelfast i,j,(rgb or al)
 next
next
unlockbuffer()
setbuffer backbuffer()

(Note: in 16 Bit Color Resolution this might not work properly, you maybe need to convert $00FF00 to its 16-Bit Equivalent and compare this result. I think you can easily convert it by writing $00FF00 to a texture in 16 Bit mode, and then read that texel - someone correct me if I'm wrong.)

thanks