demo

#!/usr/bin/env bash

throw() {
    echo "Error:" "$@"
    exit 1
}

 if [ ! -t 0 ] ; then
    echo "Error: demo script must be run in interactive mode. Exiting."
    exit 0
 fi

runtime_dir=$(dirname "$0") || throw "Failed to determine runtime directory"
ronald_path="$runtime_dir/ronald"
scenes_dir=$(realpath "$runtime_dir/../scenes") || throw "Failed to locate scenes directory"

if [ ! -d "$scenes_dir" ]; then
    throw "Could not locate scenes directory"
fi

mapfile -t files < <(ls "$scenes_dir")

PS3="Select demo scene: "

select selection in "${files[@]}"
do
    if [ "$selection" = "" ]; then
        echo "Invalid selection. Try again."
    else
        scene_path="$scenes_dir/$selection"
        echo
        echo "Using scene: $scene_path"
        echo
        read -r -e -p "Width (suggested under 512px x 512px resolution for reasonable runtime): " WIDTH
        read -r -e -p "Height: " HEIGHT
        read -r -e -p "Samples per pixel (suggested under 1500 for reasonable runtime): " SAMPLES
        read -r -e -p "Number of threads (0 for hardware_concurrency): " THREADS
        read -r -e -p "Output file name (.ppm extension): " OUTFILE

        rc=0

        echo
        set -x
        "$ronald_path" \
            --width "$WIDTH" \
            --height "$HEIGHT" \
            --samples "$SAMPLES" \
            --threads "$THREADS" \
            --out "$OUTFILE" \
            "$scene_path"

        { { rc=$?; set +x; }; } 2>/dev/null

        if [ "$rc" != "0" ]; then
            echo "Problem ocurred while rendering."
        else
            full_out_path=$(realpath "$OUTFILE") || throw "Failed to determine output file path"
            echo "Rendering finished! Output file: $full_out_path"
        fi

        break;
    fi
done