Ports: Play GLTron audio at 1x speed

Because of sample rate issues, the audio used to be played at 2x speed.

Ports/gltron/patches/0001-Build-Allow-CFLAGS-env-var-to-be-set.patch

@@ -1,7 +1,7 @@
 From 94e90c97566a73cb03c4837d53a4cddf452e42bf Mon Sep 17 00:00:00 2001
 From: Jelle Raaijmakers <jelle@gmta.nl>
 Date: Mon, 9 May 2022 00:29:43 +0200
-Subject: [PATCH 1/6] Build: Allow `CFLAGS` env var to be set
+Subject: [PATCH 1/7] Build: Allow `CFLAGS` env var to be set
 
 ---
  configure | 2 +-

Ports/gltron/patches/0002-Build-Replace-lGL-with-lgl-to-reference-our-LibGL.patch

@@ -1,7 +1,7 @@
 From dd42cfe84e75619676a06b05f8ebe1c1c2e658c9 Mon Sep 17 00:00:00 2001
 From: Jelle Raaijmakers <jelle@gmta.nl>
 Date: Mon, 9 May 2022 00:30:04 +0200
-Subject: [PATCH 2/6] Build: Replace `-lGL` with `-lgl` to reference our LibGL
+Subject: [PATCH 2/7] Build: Replace `-lGL` with `-lgl` to reference our LibGL
 
 ---
  configure | 4 ++--

Ports/gltron/patches/0003-Build-Remove-ansi-build-argument.patch

@@ -1,7 +1,7 @@
 From b01d5c00dd0dbe9512857e32ffd0822bdfb8a9e3 Mon Sep 17 00:00:00 2001
 From: Jelle Raaijmakers <jelle@gmta.nl>
 Date: Mon, 9 May 2022 00:30:54 +0200
-Subject: [PATCH 3/6] Build: Remove `-ansi` build argument
+Subject: [PATCH 3/7] Build: Remove `-ansi` build argument
 
 ---
  lua/src/Makefile.in     | 2 +-

Ports/gltron/patches/0004-Build-Fix-char-vs.-const-char-arguments.patch

@@ -1,7 +1,7 @@
 From 0ec20dfd57ae517d18f06c4c580d346fddd2f926 Mon Sep 17 00:00:00 2001
 From: Jelle Raaijmakers <jelle@gmta.nl>
 Date: Mon, 9 May 2022 00:32:04 +0200
-Subject: [PATCH 4/6] Build: Fix `char*` vs. `const char*` arguments
+Subject: [PATCH 4/7] Build: Fix `char*` vs. `const char*` arguments
 
 These arguments are of the wrong constness, which will trip our
 compiler.

Ports/gltron/patches/0005-Scripting-Fix-default-keybindings.patch

@@ -1,7 +1,7 @@
 From d2a56ba682814f2d2451fc0729ada79290de2939 Mon Sep 17 00:00:00 2001
 From: Jelle Raaijmakers <jelle@gmta.nl>
 Date: Mon, 9 May 2022 00:36:08 +0200
-Subject: [PATCH 5/6] Scripting: Fix default keybindings
+Subject: [PATCH 5/7] Scripting: Fix default keybindings
 
 These constants referred to the wrong keys.
 ---

Ports/gltron/patches/0006-SDL-Convert-SDL1-to-SDL2.patch

@@ -1,7 +1,7 @@
 From bcaa941ae5b682862aacff18e44a8a33294ba716 Mon Sep 17 00:00:00 2001
 From: Jelle Raaijmakers <jelle@gmta.nl>
 Date: Mon, 9 May 2022 00:53:48 +0200
-Subject: [PATCH 6/6] SDL: Convert SDL1 to SDL2
+Subject: [PATCH 6/7] SDL: Convert SDL1 to SDL2
 
 ---
  nebu/input/input_system.c |  7 ++++---

Ports/gltron/patches/0007-SDL-Fix-2x-audio-rate-issue.patch

@@ -0,0 +1,29 @@
+From ad6b92ee167f1241de38da428a01c27f410f3d49 Mon Sep 17 00:00:00 2001
+From: Jelle Raaijmakers <jelle@gmta.nl>
+Date: Mon, 9 May 2022 01:01:47 +0200
+Subject: [PATCH 7/7] SDL: Fix 2x audio rate issue
+
+By not passing in an `obtained` struct into `SDL_OpenAudio`, we ask SDL
+to perform any sample rate and/or format conversion for us. Previously
+GLTron would simply ignore the result in `obtained`, causing the audio
+to be played back at 2x speed.
+---
+ src/audio/sound_glue.cpp | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/audio/sound_glue.cpp b/src/audio/sound_glue.cpp
+index 9753f09..e08b1b3 100644
+--- a/src/audio/sound_glue.cpp
++++ b/src/audio/sound_glue.cpp
+@@ -170,7 +170,7 @@ extern "C" {
+ 
+ 		SDL_AudioSpec obtained;
+ 
+-    if(SDL_OpenAudio( spec, &obtained ) != 0) {
++    if(SDL_OpenAudio( spec, nullptr ) != 0) {
+       fprintf(stderr, "[error] %s\n", SDL_GetError());
+       sound->SetStatus(Sound::eUninitialized);
+     } else {
+-- 
+2.34.1
+

Ports/gltron/patches/ReadMe.md

@@ -33,3 +33,12 @@ These constants referred to the wrong keys.
 SDL: Convert SDL1 to SDL2
 
 
+## `0007-SDL-Fix-2x-audio-rate-issue.patch`
+
+SDL: Fix 2x audio rate issue
+
+By not passing in an `obtained` struct into `SDL_OpenAudio`, we ask SDL
+to perform any sample rate and/or format conversion for us. Previously
+GLTron would simply ignore the result in `obtained`, causing the audio
+to be played back at 2x speed.
+