3 # usage: ./bump2norm.sh foo_bump.tga foo_norm.tga
4 # NOTE: unfortunately requires X-server (otherwise file-tga-save won't work... no joke)
5 # also, alpha channel value 0 is avoided as gimp doesn't save it properly
10 # env variables you can set:
12 # Filter type (0 = 4 sample, 1 = sobel 3x3, 2 = sobel 5x5, 3 = prewitt 3x3, 4 = prewitt 5x5, 5-8 = 3x3,5x5,7x7,9x9)
18 # Height source (0 = average RGB, 1 = alpha channel)
20 # Conversion (0 = none, 1 = Biased RGB, 2 = Red, 3 = Green, 4 = Blue, 5 = Max RGB, 6 = Min RGB, 7 = Colorspace)
30 (img (car (gimp-file-load RUN-NONINTERACTIVE "$in" "$in")))
31 (drawable (car (gimp-image-active-drawable img)))
32 (layer (car (gimp-image-get-active-layer img)))
33 (mycurve (cons-array 256 'byte))
36 (gimp-layer-add-alpha layer)
38 (while (< i 256) (aset mycurve i i) (set! i (+ i 1)))
39 (gimp-curves-explicit drawable HISTOGRAM-RED 256 mycurve)
40 (gimp-curves-explicit drawable HISTOGRAM-GREEN 256 mycurve)
41 (gimp-curves-explicit drawable HISTOGRAM-BLUE 256 mycurve)
42 (gimp-curves-explicit drawable HISTOGRAM-ALPHA 256 mycurve)
43 (plug-in-normalmap RUN-NONINTERACTIVE img drawable $filter $minz $scale 1 $heightsource 1 $conv 0 0 1 0 1 layer)
44 (file-tga-save RUN-NONINTERACTIVE img drawable "$out" "$out" 1 1)