Ports: Add SDL2 compatibility layer port (sdl12-compat)

Ports/AvailablePorts.md

@@ -199,6 +199,7 @@ This list is also available at [ports.serenityos.net](https://ports.serenityos.n
 | [`sam`](sam/)                                       | Software Automatic Mouth (SAM)                                  | c86ea39                  | https://github.com/vidarh/SAM                                                  |
 | [`scummvm`](scummvm/)                               | ScummVM                                                         | 2.5.1                    | https://www.scummvm.org/                                                       |
 | [`SDL_sound`](SDL_sound/)                           | SDL_sound (Abstract soundfile decoder)                          |                          | https://github.com/icculus/SDL_sound                                           |
+| [`sdl12-compat`](sdl12-compat/)                     | SDL2 compatibility layer for SDL 1.2 games                      | 1.2.52                   | https://github.com/libsdl-org/sdl12-compat/                                    |
 | [`SDL2`](SDL2/)                                     | Simple DirectMedia Layer (SDL2)                                 | 2.0.22                   | https://github.com/libsdl-org/SDL                                              |
 | [`SDL2-GNUBoy`](SDL2-GNUBoy/)                       | SDL2 GNUBoy                                                     | 1.2.1                    | https://github.com/AlexOberhofer/SDL2-GNUBoy                                   |
 | [`SDL2_gfx`](SDL2_gfx/)                             | SDL2\_gfx (Graphics primitives add-on for SDL2)                 | 1.0.4                    | https://sourceforge.net/projects/sdl2gfx/                                      |

Ports/sdl12-compat/package.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env -S bash ../.port_include.sh
+port=sdl12-compat
+version=1.2.52
+workdir=sdl12-compat-release-${version}
+useconfigure=true
+files="https://github.com/libsdl-org/sdl12-compat/archive/refs/tags/release-${version}.tar.gz ${port}-${version}.tar.gz 5bd7942703575554670a8767ae030f7921a0ac3c5e2fd173a537b7c7a8599014"
+auth_type=sha256
+
+configopts=("-DCMAKE_TOOLCHAIN_FILE=${SERENITY_BUILD_DIR}/CMakeToolchain.txt" "-DCMAKE_BUILD_TYPE=Release" "-DCMAKE_INSTALL_PREFIX=${SERENITY_INSTALL_ROOT}/usr/local/" "-B./build")
+depends=("SDL2")
+
+configure() {
+    run cmake "${configopts[@]}"
+}
+
+build() {
+    (
+        cd ${workdir}/build/
+        make "${makeopts[@]}"
+    )
+}
+
+install() {
+    (
+        cd ${workdir}/build/
+        make install
+    )
+}

Ports/sdl12-compat/patches/0001-Disable-forced-fullscreen-on-logical-scaling.patch

@@ -0,0 +1,25 @@
+From a2b0791418672dffcfc8baae4d0b8158693a794c Mon Sep 17 00:00:00 2001
+From: Grigoris Pavlakis <grigpavl@ece.auth.gr>
+Date: Sat, 28 May 2022 17:21:27 +0300
+Subject: [PATCH] Disable forced fullscreen on logical scaling
+
+---
+ src/SDL12_compat.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/SDL12_compat.c b/src/SDL12_compat.c
+index b3a411e..4d8001d 100644
+--- a/src/SDL12_compat.c
++++ b/src/SDL12_compat.c
+@@ -5184,7 +5184,7 @@ SDL_SetVideoMode(int width, int height, int bpp, Uint32 flags12)
+                 fullscreen_flags20 &= ~SDL_WINDOW_FULLSCREEN_DESKTOP;
+                 SDL20_SetWindowFullscreen(VideoWindow20, fullscreen_flags20);
+                 SDL20_SetWindowSize(VideoWindow20, width, height);
+-                fullscreen_flags20 |= SDL_WINDOW_FULLSCREEN;
++                /* fullscreen_flags20 |= SDL_WINDOW_FULLSCREEN; */
+                 SDL20_SetWindowFullscreen(VideoWindow20, fullscreen_flags20);
+             }
+         }
+-- 
+2.36.1
+

Ports/sdl12-compat/patches/ReadMe.md

@@ -0,0 +1,9 @@
+# Patches for sdl12-compat on SerenityOS
+
+## `0001-Disable-forced-fullscreen-on-logical-scaling.patch`
+
+sdl12-compat forces fullscreen on anything that sets video mode
+and uses OpenGL logical scaling, causing rapid flickering and preventing
+execution. Not sure if this is an upstream bug or intended behavior,
+but disabling fullscreen at this point fixes the flickering.
+