From 6eb185bda8a8ef612cded3c2023547ff35121419 Mon Sep 17 00:00:00 2001
From: Martin Pulec <martin.pulec@cesnet.cz>
Date: Wed, 27 Aug 2025 10:53:57 +0200
Subject: [PATCH] CI Linux: build SDL3

based on 9eb376ee388df0ab3dc97a3c0c6bf8d95cd1a590
---
 .github/scripts/Linux/download_build_sdl.sh | 19 +++++++++++++++++++
 .github/scripts/Linux/install_sdl.sh        |  7 +++++++
 .github/scripts/Linux/prepare.sh            |  8 ++++++--
 .github/workflows/ccpp.yml                  | 12 ++++++++++++
 4 files changed, 44 insertions(+), 2 deletions(-)
 create mode 100755 .github/scripts/Linux/download_build_sdl.sh
 create mode 100755 .github/scripts/Linux/install_sdl.sh

diff --git a/.github/scripts/Linux/download_build_sdl.sh b/.github/scripts/Linux/download_build_sdl.sh
new file mode 100755
index 000000000..577a3e2bd
--- /dev/null
+++ b/.github/scripts/Linux/download_build_sdl.sh
@@ -0,0 +1,19 @@
+#!/bin/sh -eu
+
+mkdir -p /var/tmp/sdl
+cd /var/tmp/sdl
+
+git clone --depth 1 https://github.com/libsdl-org/SDL
+cd SDL
+cmake -S . -B build
+cmake --build build -j "$(nproc)"
+sudo cmake --install build
+cd ..
+
+git clone --depth 1 https://github.com/libsdl-org/SDL_ttf
+cd SDL_ttf
+cmake -S . -B build
+cmake --build build -j "$(nproc)"
+sudo cmake --install build
+cd ..
+
diff --git a/.github/scripts/Linux/install_sdl.sh b/.github/scripts/Linux/install_sdl.sh
new file mode 100755
index 000000000..ec2bc9525
--- /dev/null
+++ b/.github/scripts/Linux/install_sdl.sh
@@ -0,0 +1,7 @@
+#!/bin/sh -eu
+
+cd /var/tmp/sdl/SDL
+sudo cmake --install build
+cd ../SDL_ttf
+sudo cmake --install build
+
diff --git a/.github/scripts/Linux/prepare.sh b/.github/scripts/Linux/prepare.sh
index 56e10b737..7b61c2287 100755
--- a/.github/scripts/Linux/prepare.sh
+++ b/.github/scripts/Linux/prepare.sh
@@ -24,7 +24,6 @@ sudo apt install libfluidsynth-dev
 sudo apt install libglew-dev libglfw3-dev
 sudo apt install libglm-dev
 sudo apt install imagemagick libmagickwand-dev
-sudo apt install libsdl2-dev libsdl2-ttf-dev
 sudo apt install libsoxr-dev libspeexdsp-dev
 sudo apt install libssl-dev
 sudo apt install libasound-dev libcaca-dev libjack-jackd2-dev libnatpmp-dev libv4l-dev portaudio19-dev
@@ -36,7 +35,12 @@ get_build_deps_excl() { # $2 - pattern to exclude; separate packates with '\|' (
         apt-cache showsrc "$1" | sed -n '/^Build-Depends:/{s/Build-Depends://;p;q}' | tr ',' '\n' | cut -f 2 -d\  | grep -v "$2"
 }
 
-ffmpeg_build_dep=$(get_build_deps_excl ffmpeg 'nonexistent-placeholder')
+sudo apt build-dep libsdl2
+sdl2_ttf_build_dep=$(get_build_deps_excl libsdl2-ttf libsdl2-dev)
+# shellcheck disable=SC2086 # intentional
+sudo apt install $sdl2_ttf_build_dep
+
+ffmpeg_build_dep=$(get_build_deps_excl ffmpeg 'libsdl')
 # shellcheck disable=SC2086 # intentional
 sudo apt install $ffmpeg_build_dep libdav1d-dev libde265-dev libopenh264-dev
 sudo apt-get -y remove 'libavcodec*' 'libavutil*' 'libswscale*' libvpx-dev nginx
diff --git a/.github/workflows/ccpp.yml b/.github/workflows/ccpp.yml
index 59a2d75a3..842e85876 100644
--- a/.github/workflows/ccpp.yml
+++ b/.github/workflows/ccpp.yml
@@ -91,6 +91,18 @@ jobs:
     - name: Install Cached FFmpeg
       if: steps.cache-ffmpeg.outputs.cache-hit == 'true'
       run: .github/scripts/Linux/install_ffmpeg.sh
+    - name: Cache SDL
+      id: cache-sdl
+      uses: actions/cache@v3
+      with:
+        path: '/var/tmp/sdl'
+        key: cache-sdl-${{ runner.os }}-${{ hashFiles( '.github/scripts/Linux/prepare.sh', '.github/scripts/Linux/download_build_sdl.sh' ) }}
+    - name: Build SDL
+      if: steps.cache-sdl.outputs.cache-hit != 'true'
+      run: .github/scripts/Linux/download_build_sdl.sh
+    - name: Install Cached SDL
+      if: steps.cache-sdl.outputs.cache-hit == 'true'
+      run: .github/scripts/Linux/install_sdl.sh
     - name: configure
       run: "./autogen.sh $FEATURES || { RC=$?; cat config.log; exit $RC; }"
     - name: make