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#!/bin/sh
# Generates a simple GL/EGL extension function loader.
#
# The input is a .txt file, with each function to load on its own line.
# If a line starts with a -, it is optional, and will not cause the loader
# to fail if it can't load the function. You'll need to check if that function
# is NULL before using it.
if [ $# -ne 2 ]; then
exit 1
fi
SPEC=$1
OUT=$2
BASE=$(basename "$SPEC" .txt)
INCLUDE_GUARD=$(printf %s "$SPEC" | tr -c [:alnum:] _ | tr [:lower:] [:upper:])
DECL=""
DEFN=""
LOADER=""
DECL_FMT='extern %s %s;'
DEFN_FMT='%s %s;'
LOADER_FMT='%s = (%s)eglGetProcAddress("%s");'
CHECK_FMT='if (!%s) {
wlr_log(L_ERROR, "Unable to load %s");
return false;
}'
while read -r COMMAND; do
OPTIONAL=0
FUNC_PTR_FMT='PFN%sPROC'
case $COMMAND in
-*)
OPTIONAL=1
;;
esac
case $COMMAND in
*WL)
FUNC_PTR_FMT='PFN%s'
;;
esac
COMMAND=${COMMAND#-}
FUNC_PTR=$(printf "$FUNC_PTR_FMT" "$COMMAND" | tr [:lower:] [:upper:])
DECL="$DECL$(printf "\n$DECL_FMT" "$FUNC_PTR" "$COMMAND")"
DEFN="$DEFN$(printf "\n$DEFN_FMT" "$FUNC_PTR" "$COMMAND")"
LOADER="$LOADER$(printf "\n$LOADER_FMT" "$COMMAND" "$FUNC_PTR" "$COMMAND")"
if [ $OPTIONAL -eq 0 ]; then
LOADER="$LOADER$(printf "\n$CHECK_FMT" "$COMMAND" "$COMMAND")"
fi
done < $SPEC
case $OUT in
*.h)
cat > $OUT << EOF
#ifndef $INCLUDE_GUARD
#define $INCLUDE_GUARD
#include <stdbool.h>
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <EGL/eglmesaext.h>
#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
bool load_$BASE(void);
$DECL
#endif
EOF
;;
*.c)
cat > $OUT << EOF
#include <wlr/util/log.h>
#include "$BASE.h"
$DEFN
bool load_$BASE(void) {
static bool done = false;
if (done) {
return true;
}
$LOADER
done = true;
return true;
}
EOF
;;
*)
exit 1
;;
esac
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