Linux Arm Support (#5)

* Linux Arm Support

Lets try linux arm support

* Update Build.csproj

* Update BuildLinuxTask.cs

* Create ffprobe.linux-arm64.config

Author: dellis1972

.github/workflows/main.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [windows-latest, ubuntu-latest, macos-latest]
+        os: [windows-latest, ubuntu-latest, macos-latest, ubuntu-22.04-arm]
       fail-fast: false
     steps:
       - name: Expose GitHub Runtime

build/Build.csproj

@@ -22,6 +22,7 @@
     <Using Include="Cake.Core.Diagnostics" />
     <Using Include="Cake.Core.IO" />
     <Using Include="Cake.FileHelpers" />
+    <Using Include="System.Runtime.InteropServices" />
   </ItemGroup>
 
   <ItemGroup>
@@ -34,4 +35,4 @@
     <ProjectReference Include="..\buildscripts\MonoGame.Tool.BuildScripts.csproj" />
   </ItemGroup>
 
-</Project>
+</Project>

build/BuildLinuxTask.cs

@@ -10,10 +10,11 @@ public sealed class BuildLinuxTask : FrostingTask<BuildContext>
     public override void Run(BuildContext context)
     {
         // Absolute path to the artifact directory is needed for flags since they don't allow relative path
+        var arch = RuntimeInformation.OSArchitecture;
         var artifactDir = context.MakeAbsolute(new DirectoryPath(context.ArtifactsDir));
-        var dependencyDir = context.MakeAbsolute(new DirectoryPath($"{context.ArtifactsDir}/../dependencies-linux-x64"));
+        var dependencyDir = context.MakeAbsolute(new DirectoryPath($"{context.ArtifactsDir}/../dependencies-linux-{(arch == Architecture.Arm64 ? "arm64" : "x64")}"));
         var prefixFlag = $"--prefix=\"{dependencyDir}\"";
-        var hostFlag = "--host=\"x86_64-linux-gnu\"";
+        var hostFlag = arch == Architecture.Arm64 ? "--host=\"aarch64-linux-gnu\"" : "--host=\"x86_64-linux-gnu\"";
         var binDirFlag = $"--bindir=\"{artifactDir}\"";
 
         var envVariables = new Dictionary<string, string>
@@ -85,7 +86,8 @@ private static string GetFFMpegConfigureFlags(BuildContext context)
     {
         var ignoreCommentsAndNewLines = (string line) => !string.IsNullOrWhiteSpace(line) && !line.StartsWith('#');
         var configureFlags = context.FileReadLines("ffprobe.config").Where(ignoreCommentsAndNewLines);
-        var osConfigureFlags = context.FileReadLines($"ffprobe.linux-x64.config").Where(ignoreCommentsAndNewLines);
+        var osConfigFile = RuntimeInformation.OSArchitecture == Architecture.Arm64 ? "ffprobe.linux-arm64.config" : "ffprobe.linux-x64.config";
+        var osConfigureFlags = context.FileReadLines(osConfigFile).Where(ignoreCommentsAndNewLines);
         return string.Join(' ', configureFlags) + " " + string.Join(' ', osConfigureFlags);
     }
 }

ffprobe.linux-arm64.config

@@ -0,0 +1,10 @@
+########################################################################################################################
+### Toolchain Options
+########################################################################################################################  
+--arch=aarch64
+--target-os=linux
+
+########################################################################################################################
+### Optimization Options
+########################################################################################################################
+--enable-neon