PACKAGE/DEFCONFIG: create&add libretro-fake08 (#155)

* PACKAGE: add & create `libretro-fake08` pkg

* PACKAGE: optimize `libretro-fake08` on uClibc (patch)
- disable audio by default here

board/miyoo/main/gmenu2x/sections/cores/zblank.fake08.ra

@@ -0,0 +1,4 @@
+title=fake08
+description=fake08 libretro core
+exec=/mnt/emus/retroarch/fake08.sh
+selectordir=/mnt/roms/PICO8

configs/miyoo_musl_defconfig

@@ -203,6 +203,7 @@ BR2_PACKAGE_LIBRETRO_CAP32=y
 BR2_PACKAGE_LIBRETRO_CHAILOVE=y
 BR2_PACKAGE_LIBRETRO_DINOTHAWR=y
 BR2_PACKAGE_LIBRETRO_ECWOLF=y
+BR2_PACKAGE_LIBRETRO_FAKE08=y
 BR2_PACKAGE_LIBRETRO_FCEUMM=y
 BR2_PACKAGE_LIBRETRO_FMSX=y
 BR2_PACKAGE_LIBRETRO_FREECHAF=y

configs/miyoo_uclibc_defconfig

@@ -181,6 +181,7 @@ BR2_PACKAGE_LIBRETRO_CAP32=y
 BR2_PACKAGE_LIBRETRO_CHAILOVE=y
 BR2_PACKAGE_LIBRETRO_DINOTHAWR=y
 BR2_PACKAGE_LIBRETRO_ECWOLF=y
+BR2_PACKAGE_LIBRETRO_FAKE08=y
 BR2_PACKAGE_LIBRETRO_FCEUMM=y
 BR2_PACKAGE_LIBRETRO_FMSX=y
 BR2_PACKAGE_LIBRETRO_FREECHAF=y

package/miyoo/retroarch/Config.in

@@ -24,6 +24,7 @@ source "package/miyoo/retroarch/libretro-cap32/Config.in"
 source "package/miyoo/retroarch/libretro-chailove/Config.in"
 source "package/miyoo/retroarch/libretro-dinothawr/Config.in"
 source "package/miyoo/retroarch/libretro-ecwolf/Config.in"
+source "package/miyoo/retroarch/libretro-fake08/Config.in"
 source "package/miyoo/retroarch/libretro-fceumm/Config.in"
 source "package/miyoo/retroarch/libretro-fmsx/Config.in"
 source "package/miyoo/retroarch/libretro-freechaf/Config.in"

package/miyoo/retroarch/libretro-fake08/0001-LIBRETRO-add-audio_play-option.patch

@@ -0,0 +1,87 @@
+From fb59413d4d6897ac47862a47e5cf8a9fb30df107 Mon Sep 17 00:00:00 2001
+From: Apaczer <[email protected]>
+Date: Thu, 20 Feb 2025 22:52:10 +0100
+Subject: [PATCH] LIBRETRO: add `audio_play` option
+
+---
+ platform/libretro/libretro.cpp            | 20 ++++++++++++++++++--
+ platform/libretro/libretro_core_options.h | 11 +++++++++++
+ 2 files changed, 29 insertions(+), 2 deletions(-)
+
+diff --git a/platform/libretro/libretro.cpp b/platform/libretro/libretro.cpp
+index 47fa867..daeb526 100644
+--- a/platform/libretro/libretro.cpp
++++ b/platform/libretro/libretro.cpp
+@@ -35,6 +35,7 @@ static retro_log_printf_t log_cb;
+ const size_t audioBufferSize = SAMPLESPERFRAME * NUM_BUFFERS;
+
+ int16_t audioBuffer[audioBufferSize];
++int16_t audioBufferNULL[audioBufferSize];
+
+ const int PicoScreenWidth = 128;
+ const int PicoScreenHeight = 128;
+@@ -45,6 +46,8 @@ static int crop_h_right = 0;
+ static int crop_v_top = 0;
+ static int crop_v_bottom = 0;
+
++static bool option_audio_fill_buffer = true;
++
+ const size_t screenBufferSize = PicoScreenWidth*PicoScreenHeight;
+ uint16_t screenBuffer[screenBufferSize];
+
+@@ -72,6 +75,15 @@ static void check_variables(bool startup)
+     struct retro_variable var = {0};
+     int video_updated = 0;
+
++    var.key = "audio_play";
++    if (enviro_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
++    {
++       if (!strcmp(var.value, "enabled"))
++          option_audio_fill_buffer = true;
++       else if (!strcmp(var.value, "disabled"))
++          option_audio_fill_buffer = false;
++    }
++
+     var.key = "fake08_video_scale";
+     if (enviro_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
+     {
+@@ -404,8 +416,12 @@ EXPORT void retro_run()
+         kDown = currKDown;
+
+         if (frame % 2 == 0) {
+-            _audio->FillAudioBuffer(&audioBuffer, 0, SAMPLESPERFRAME);
+-            audio_batch_cb(audioBuffer, SAMPLESPERFRAME);
++            if (option_audio_fill_buffer) {
++                _audio->FillAudioBuffer(&audioBuffer, 0, SAMPLESPERFRAME);
++                audio_batch_cb(audioBuffer, SAMPLESPERFRAME);
++            } else {
++                audio_batch_cb(audioBufferNULL, SAMPLESPERFRAME);
++            }
+         }
+
+     }
+diff --git a/platform/libretro/libretro_core_options.h b/platform/libretro/libretro_core_options.h
+index 02c3a1a..af05ffc 100644
+--- a/platform/libretro/libretro_core_options.h
++++ b/platform/libretro/libretro_core_options.h
+@@ -49,6 +49,17 @@ extern "C" {
+  *   frontend language definition */
+
+ struct retro_core_option_definition option_defs_us[] = {
++   {
++      "audio_play",
++      "Audio playback",
++      "Enable or disable Audio playback for performance sake",
++      {
++         { "enabled", NULL },
++         { "disabled", NULL },
++         { NULL, NULL },
++      },
++      "enabled"
++   },
+    {
+       "fake08_video_scale",
+       "Video Scale",
+-- 
+2.45.2.windows.1
+

package/miyoo/retroarch/libretro-fake08/0002-LIBRETRO-disable-audio-on-UCLIBC.patch

@@ -0,0 +1,29 @@
+From 9573ce039aa2ea1a9eb730b5b9e215cc7c4a9955 Mon Sep 17 00:00:00 2001
+From: Apaczer <[email protected]>
+Date: Sat, 22 Feb 2025 15:02:35 +0100
+Subject: [PATCH] LIBRETRO: disable audio on UCLIBC
+
+FillAudioBuffer() is botched here
+---
+ platform/libretro/libretro_core_options.h | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/platform/libretro/libretro_core_options.h b/platform/libretro/libretro_core_options.h
+index af05ffc..5399c6d 100644
+--- a/platform/libretro/libretro_core_options.h
++++ b/platform/libretro/libretro_core_options.h
+@@ -58,7 +58,11 @@ struct retro_core_option_definition option_defs_us[] = {
+          { "disabled", NULL },
+          { NULL, NULL },
+       },
++#if !defined(__UCLIBC__)
+       "enabled"
++#else
++      "disabled"
++#endif
+    },
+    {
+       "fake08_video_scale",
+-- 
+2.45.2.windows.1
+

package/miyoo/retroarch/libretro-fake08/Config.in

@@ -0,0 +1,11 @@
+config BR2_PACKAGE_LIBRETRO_FAKE08
+	bool "libretro-fake08"
+	depends on BR2_PACKAGE_RETROARCH
+	depends on BR2_INSTALL_LIBSTDCPP
+	help
+	  A libretro PICO-8 emulator core.
+
+	  https://github.com/jtothebell/fake-08
+
+comment "LIBRETRO_FAKE08 needs a toolchain w/ C++"
+	depends on !BR2_INSTALL_LIBSTDCPP

package/miyoo/retroarch/libretro-fake08/libretro-fake08.hash

@@ -0,0 +1,2 @@
+# Locally calculated
+sha256  659d2d522620317eaf57f7cf257c2f68e8bc7baf72654c7ed3887c77571a0572  libretro-fake08-0d26fd59103941e5f95e0ee665c6e0fb8c6b6f03-br1.tar.gz

package/miyoo/retroarch/libretro-fake08/libretro-fake08.mk

@@ -0,0 +1,28 @@
+################################################################################
+#
+# Fake-08
+#
+################################################################################
+
+#Commit version of Sep 3, 2024
+LIBRETRO_FAKE08_VERSION = 0d26fd59103941e5f95e0ee665c6e0fb8c6b6f03
+LIBRETRO_FAKE08_SITE = https://github.com/jtothebell/fake-08.git
+LIBRETRO_FAKE08_SITE_METHOD = git
+LIBRETRO_FAKE08_GIT_SUBMODULES = YES
+LIBRETRO_FAKE08_LICENSE = MIT
+LIBRETRO_FAKE08_LICENSE_FILES = LICENSE.MD
+
+define LIBRETRO_FAKE08_BUILD_CMDS
+	CFLAGS="$(TARGET_CFLAGS) $(COMPILER_COMMONS_CFLAGS) -D_NEED_FULL_PATH_" \
+		CXXFLAGS="$(TARGET_CXXFLAGS) $(COMPILER_COMMONS_CXXFLAGS)" \
+		LDFLAGS="$(TARGET_LDFLAGS) $(COMPILER_COMMONS_LDFLAGS)" \
+		$(MAKE) CXX="$(TARGET_CXX)" CC="$(TARGET_CC)" -C $(@D)/platform/libretro -f Makefile platform="unix"
+endef
+
+define LIBRETRO_FAKE08_INSTALL_TARGET_CMDS
+    mkdir -p "${BINARIES_DIR}/retroarch/cores"
+	$(INSTALL) -D $(@D)/platform/libretro/fake08_libretro.so \
+		$(TARGET_DIR)/usr/lib/libretro/fake08_libretro.so
+endef
+
+$(eval $(generic-package))