From 8252e54e14489eb217af8bd40bc63a37b408abea Mon Sep 17 00:00:00 2001
From: jdgleaver
Date: Fri, 1 Apr 2022 11:56:13 +0100
Subject: Snes9x2005 Non-Plus: Add optional low pass audio filter

---
 libretro_core_options.h | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

(limited to 'libretro_core_options.h')

diff --git a/libretro_core_options.h b/libretro_core_options.h
index 6f46d16..28bb210 100644
--- a/libretro_core_options.h
+++ b/libretro_core_options.h
@@ -122,6 +122,53 @@ struct retro_core_option_v2_definition option_defs_us[] = {
       },
       "33"
    },
+#ifndef USE_BLARGG_APU
+   {
+      "snes9x_2005_low_pass_filter",
+      "Audio Filter",
+      NULL,
+      "Enable a low pass audio filter to soften treble artifacts and mimic the 'bassy' sound of original SNES hardware.",
+      NULL,
+      NULL,
+      {
+         { "disabled", NULL },
+         { "enabled",  NULL },
+         { NULL, NULL },
+      },
+      "disabled"
+   },
+   {
+      "snes9x_2005_low_pass_range",
+      "Audio Filter Level",
+      NULL,
+      "Specify the cut-off frequency of the low pass audio filter. A higher value increases the perceived 'strength' of the filter, since a wider range of the high frequency spectrum is attenuated.",
+      NULL,
+      NULL,
+      {
+         { "5",  "5%" },
+         { "10", "10%" },
+         { "15", "15%" },
+         { "20", "20%" },
+         { "25", "25%" },
+         { "30", "30%" },
+         { "35", "35%" },
+         { "40", "40%" },
+         { "45", "45%" },
+         { "50", "50%" },
+         { "55", "55%" },
+         { "60", "60%" },
+         { "65", "65%" },
+         { "70", "70%" },
+         { "75", "75%" },
+         { "80", "80%" },
+         { "85", "85%" },
+         { "90", "90%" },
+         { "95", "95%" },
+         { NULL, NULL },
+      },
+      "60"
+   },
+#endif
    {
       "snes9x_2005_overclock_cycles",
       "Reduce Slowdown (Hack, Unsafe, Restart)",
-- 
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