utils: gen-shader-headers: Add a utility to generate headers from shaders

Two simple script to generate a header that contains GLSL shaders translated
to C arrays.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>

utils/gen-shader-headers.sh

@@ -0,0 +1,44 @@
+#!/bin/sh
+set -x
+
+if [ $# -lt 4 ]; then
+	echo "Invalid arg count must be >= 5"
+	exit 1
+fi
+src_dir="$1"; shift
+build_dir="$1"; shift
+build_path=$build_dir/"$1"; shift
+
+cat <<EOF > "$build_path"
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/* This file is auto-generated, do not edit! */
+/*
+ * Copyright (C) 2025, Linaro Ltd.
+ *
+ */
+
+#pragma once
+
+EOF
+
+cat <<EOF >> "$build_path"
+/*
+ * List the names of the shaders at the top of
+ * header for readability's sake
+ *
+EOF
+
+for file in "$@"; do
+	echo "file is $file"
+	name=$(basename "$build_dir/$file" | tr '.' '_')
+	echo " * unsigned char $name;" >> "$build_path"
+done
+
+echo "*/" >> "$build_path"
+
+echo "/* Hex encoded shader data */" >> "$build_path"
+for file in "$@"; do
+	name=$(basename "$build_dir/$file")
+	"$src_dir/utils/gen-shader-header.py" "$name" "$build_dir/$file" >> "$build_path"
+	echo >> "$build_path"
+done