+ # Specific hacks for normalmaps.
+ case "$f" in
+ ./maps/*/lm_[0-9][0-9][0-9][13579]) # deluxemap
+ export S2TC_COLORDIST_MODE=NORMALMAP
+ export S2TC_RANDOM_COLORS=256
+ export S2TC_REFINE_COLORS=LOOP
+ export S2TC_DITHER_MODE=NONE
+ # Engine ignores alpha channel on these, so we can use the DXT1 black encoding.
+ export CRUNCH_TEXTYPEFLAGS='-gamma 1.0 -renormalize -rtopmip -uniformMetrics -usetransparentindicesforblack'
+ ;;
+ *_norm)
+ export S2TC_COLORDIST_MODE=NORMALMAP
+ export S2TC_RANDOM_COLORS=256
+ export S2TC_REFINE_COLORS=LOOP
+ export S2TC_DITHER_MODE=NONE
+ # Alpha channel here means height.
+ export CRUNCH_TEXTYPEFLAGS='-gamma 1.0 -renormalize -rtopmip -uniformMetrics'
+ ;;
+ *)
+ export S2TC_COLORDIST_MODE=SRGB_MIXED
+ export S2TC_RANDOM_COLORS=64
+ export S2TC_REFINE_COLORS=LOOP
+ export S2TC_DITHER_MODE=FLOYDSTEINBERG
+ # Color channel-like images - consider as sRGB.
+ export CRUNCH_TEXTYPEFLAGS='-gamma 2.2'
+ ;;
+ esac
+