add a shell script to run the gimp-normalmap filter

diff --git a/misc/tools/normalmap.sh b/misc/tools/normalmap.sh
new file mode 100755 (executable)
index 0000000..08905b7
--- /dev/null
+++ b/misc/tools/normalmap.sh
@@ -0,0 +1,36 @@
+#!/bin/sh
+
+# usage: ./bump2norm.sh foo_bump.tga foo_norm.tga
+# NOTE: unfortunately requires X-server (otherwise file-tga-save won't work... no joke)
+
+in=$1
+out=$2
+
+# env variables you can set:
+# filter:
+#   Filter type (0 = 4 sample, 1 = sobel 3x3, 2 = sobel 5x5, 3 = prewitt 3x3, 4 = prewitt 5x5, 5-8 = 3x3,5x5,7x7,9x9)
+# minz:
+#   Minimun Z (0 to 1)
+# scale:
+#   Scale (>0)
+# conv:
+#   Conversion (0 = none, 1 = Biased RGB, 2 = Red, 3 = Green, 4 = Blue, 5 = Max RGB, 6 = Min RGB, 7 = Colorspace)
+: ${filter:=0}
+: ${minz:=0}
+: ${scale:=1}
+: ${conv:=0}
+
+gimp -i -b - <<EOF
+
+(let*(
+               (img (car (gimp-file-load RUN-NONINTERACTIVE "$in" "$in")))
+               (drawable (car (gimp-image-active-drawable img)))
+               (layer (car (gimp-image-get-active-layer img)))
+       )
+       (gimp-layer-add-alpha layer)
+       (plug-in-normalmap RUN-NONINTERACTIVE img drawable $filter $minz $scale 1 0 1 $conv 0 0 1 0 1 layer)
+       (file-tga-save RUN-NONINTERACTIVE img drawable "$out" "$out" 1 1)
+       (gimp-quit 0)
+)
+
+EOF