#!/bin/sh
set -e

BASEDIR=$(dirname "$0")
INPUT="$BASEDIR/shaders"
OUTPUT="$BASEDIR/bsnes-shaders"

available_shaders() {
	find "$INPUT" -type f -name '*.shader' |
	while read -r SHADERFILE; do
		# Grab the name of the shader
		SHADERNAME=$(basename "$SHADERFILE" .shader)

		# Grab the version of the shader
		TEMP=$(dirname "$SHADERFILE")
		SHADERVERSION=${TEMP##*/}

		# Grab the target of the shader.
		TEMP=${TEMP%/*}
		SHADERTARGET=${TEMP##*/}

		printf "%s\t%s\t%s\n" "$SHADERTARGET" "$SHADERVERSION" "$SHADERNAME"
	done
}

filter_shaders() {
	(
		IFS=$(printf "\t")
		while read -r TARGET VERSION NAME; do
			# bsnes v082 only understands v1.0 shaders.
			if [ "$VERSION" != "v1.0" ] ; then
				continue
			fi

			printf "%s\t%s\t%s\n" "$TARGET" "$VERSION" "$NAME"
		done
	)
}

mkdir -p "$OUTPUT"

available_shaders | filter_shaders | (
	IFS=$(printf "\t")
	while read -r TARGET VERSION NAME; do
		cp "$INPUT/$TARGET/$VERSION/$NAME.shader" "$OUTPUT/$NAME.$TARGET.shader"
	done
)

echo "bsnes compatible shaders are now in $OUTPUT"