From 6aaff9d976c0cfea5fa17bfe542a41c42f4077bb Mon Sep 17 00:00:00 2001
From: div0 <div0@f962a42d-fe04-0410-a3ab-8c8b0445ebaa>
Date: Wed, 30 Jul 2008 15:23:10 +0000
Subject: [PATCH] script to automatically create shaders for textures with
 alpha channel, and sky

git-svn-id: svn://svn.icculus.org/nexuiz/trunk@3981 f962a42d-fe04-0410-a3ab-8c8b0445ebaa
---
 misc/autoshader.sh | 177 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 177 insertions(+)
 create mode 100644 misc/autoshader.sh

diff --git a/misc/autoshader.sh b/misc/autoshader.sh
new file mode 100644
index 000000000..a63abdb45
--- /dev/null
+++ b/misc/autoshader.sh
@@ -0,0 +1,177 @@
+#!/bin/sh
+
+if ! [ -d "textures" ] && ! [ -d "env" ]; then
+	echo "Sorry, must be run from a directory with a textures subfolder. Giving up."
+	exit 1
+fi
+
+makeshader()
+{
+	s=`texnormalize "$1"`
+	dir=${s#textures/}
+	dir=${dir%%/*}
+	echo scripts/$dir.shader
+	mkdir -p scripts
+	cat <<EOF >>"scripts/$dir.shader"
+$s
+{
+	qer_editorimage $1
+	qer_trans 0.5
+	// maybe: surfaceparm nonsolid
+	surfaceparm trans
+	surfaceparm alphashadow
+	surfaceparm nomarks
+	cull disable
+	{
+		map $s
+		blendfunc blend
+		// or: alphafunc GE128
+	}
+	{
+		map $lightmap
+		blendfunc filter
+		rgbGen identity
+	}
+}
+EOF
+}
+
+makeskyshader()
+{
+	s=`texnormalize "$1"`
+	s=${s%_up}
+	s=${s#env/}
+	dir=${s%%/*}
+	echo >&2 "appending to scripts/$dir.shader"
+	echo scripts/$dir.shader
+	mkdir -p scripts
+	cat <<EOF >>"scripts/$dir.shader"
+textures/$s
+{
+	qer_editorimage $1
+	surfaceparm noimpact
+	surfaceparm nolightmap
+	surfaceparm sky
+	surfaceparm nomarks
+	q3map_sunExt .5 .5 .7 42 90 2 16 // red green blue intensity degrees elevation deviance samples
+	q3map_surfacelight 150 // intensity
+	skyparms env/$s - -
+}
+EOF
+}
+
+texnormalize()
+{
+	echo "$1" | sed 's/\.[Jj][Pp][Gg]$\|\.[Tt][Gg][Aa]$\|\.[Pp][Nn][Gg]$//;'
+}
+
+allshadernames() # prints all shader names or texture names
+{
+	cat scripts/*.shader 2>/dev/null | tr '\r' '\n' | {
+		mode=root
+		while IFS= read -r LINE; do
+			LINE=`echo "$LINE" | sed 's,//.*,,; s/\s\+/ /g; s/^ //; s/ $//; s/"//g;'`
+			[ -n "$LINE" ] || continue
+			set -- $LINE
+			case "$mode:$1" in
+				root:'{')
+					mode=shader
+					;;
+				root:*)
+					texnormalize "$1"
+					;;
+
+				shader:'{')
+					mode=stage
+					;;
+				shader:'}')
+					mode=root
+					;;
+				shader:skyparms)
+					echo "`texnormalize "$1"`_up"
+					;;
+
+				stage:'}')
+					mode=shader
+					;;
+				stage:map)
+					texnormalize "$2"
+					;;
+				stage:clampmap)
+					texnormalize "$2"
+					;;
+				stage:animmap)
+					shift
+					shift
+					for X in "$@"; do
+						texnormalize "$X"
+					done
+					;;
+			esac
+		done
+	}
+}
+
+allshaders=`allshadernames`
+lf="
+"
+
+has_shader()
+{
+	sh=`texnormalize "$1"`
+	case "$lf$allshaders$lf" in
+		*"$lf$sh$lf"*)
+			return 0
+			;;
+	esac
+	return 1
+}
+
+has_alpha()
+{
+	convert "$1" -depth 8 RGBA:- | xxd -c 4 -g 1 | grep -v " ff  " >/dev/null
+}
+
+autoshaders()
+{
+	{
+		[ -d "textures" ] && find textures -type f \( -iname \*.tga -o -iname \*.png \) -print | while IFS= read -r TEX; do
+			case `texnormalize "$TEX"` in
+				*_norm|*_shirt|*_pants|*_glow|*_gloss|*_bump)
+					# ignore these (they are used implicitly)
+					continue
+					;;
+			esac
+			if has_shader "$TEX"; then
+				echo>&2 "    $TEX has an associated shader, ignoring."
+			else
+				if has_alpha "$TEX"; then
+					echo>&2 "*** $TEX has alpha but no shader, creating default alpha shader."
+					makeshader "$TEX"
+				else
+					echo>&2 "    $TEX has no shader and no alpha, fine."
+				fi
+			fi
+		done
+		[ -d "env" ] && find env -type f \( -iname \*_up.tga -o -iname \*_up.png -o -iname \*_up.jpg \) -print | while IFS= read -r TEX; do
+			if has_shader "$TEX"; then
+				echo>&2 "    $TEX has an associated shader, ignoring."
+			else
+				echo>&2 "*** $TEX is sky but has no shader, creating default sky shader."
+				makeskyshader "$TEX"
+			fi
+		done
+	} | sort -u
+}
+
+aashaders=`autoshaders`
+
+if [ -n "$aashaders" ]; then
+	cat <<EOF
+The following shader files have been automatically created or appended to:
+
+$aashaders
+
+Please edit them to your needs, and possibly rename them.
+EOF
+fi
-- 
2.39.2