Add libretro module lr-retro8 - a libretro port of retro8

retro8 is an open source re-implementation of the PICO-8 fantasy console.
(PICO-8 is a virtual machine and game engine created by Lexaloffle Games - see https://en.wikipedia.org/wiki/PICO-8)

Note - we disable the RetroArch imageviewer in pico8/retroarch.cfg so .p8.png files will be passed onto the core.

Author: FollyMaddy

platforms.cfg

@@ -177,6 +177,9 @@ pcengine_theme="pcengine"
 pcfx_exts=".pce .ccd .cue .iso .chd"
 pcfx_fullname="PC-FX"
 
+pico8_exts=".p8 .png .zip"
+pico8_fullname="PICO-8"
+
 pokemini_exts=".min .zip"
 pokemini_fullname="Pokemon Mini"
 

scriptmodules/libretrocores/lr-retro8.sh

@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+
+# This file is part of The RetroPie Project
+#
+# The RetroPie Project is the legal property of its developers, whose names are
+# too numerous to list here. Please refer to the COPYRIGHT.md file distributed with this source.
+#
+# See the LICENSE.md file at the top-level directory of this distribution and
+# at https://raw.githubusercontent.com/RetroPie/RetroPie-Setup/master/LICENSE.md
+#
+
+rp_module_id="lr-retro8"
+rp_module_desc="PICO-8 compatible engine - port of retro8 for libretro"
+rp_module_help="ROM Extensions: .p8 .p8.png .zip\n\nCopy your roms to $romdir/pico8"
+rp_module_licence="GPL3 https://raw.githubusercontent.com/libretro/retro8/master/LICENSE"
+rp_module_repo="git https://github.com/libretro/retro8.git master"
+rp_module_section="exp"
+
+function sources_lr-retro8() {
+    gitPullOrClone
+}
+
+function build_lr-retro8() {
+    make clean
+    make
+    md_ret_require="$md_build/retro8_libretro.so"
+}
+
+function install_lr-retro8() {
+    md_ret_files=(
+        'retro8_libretro.so'
+        'README.md'
+        'LICENSE'
+    )
+}
+
+function configure_lr-retro8() {
+    mkRomDir "pico8"
+
+    addEmulator 1 "$md_id" "pico8" "$md_inst/retro8_libretro.so"
+    addSystem "pico8"
+
+    [[ "$md_mode" == "remove" ]] && return
+
+    ensureSystemretroconfig "pico8"
+
+    # disable retroarch built-in imageviewer so we can run .p8.png files
+    iniConfig " = " '"' "$md_conf_root/pico8/retroarch.cfg"
+    iniSet "builtin_imageviewer_enable" "false"
+}