public void OnPreprocessBuild(BuildReport report)
{
if (report.summary.platform != BuildTarget.Android)
{
return;
}
if (!ARCorePreprocessBuild.isARCoreLoaderEnabled)
{
return;
}
var assets = AssetDatabase.FindAssets($"t:{nameof(XRReferenceImageLibrary)}");
var libraries = assets
.Select(AssetDatabase.GUIDToAssetPath)
.Select(AssetDatabase.LoadAssetAtPath <XRReferenceImageLibrary>);
var index = 0;
foreach (var library in libraries)
{
index++;
EditorUtility.DisplayProgressBar(
$"Compiling {nameof(XRReferenceImageLibrary)} ({index} of {assets.Length})",
$"{AssetDatabase.GetAssetPath(library)} ({library.count} image{(library.count == 1 ? "" : "s")})",
(float)index / assets.Length);
try
{
library.SetDataForKey(ARCoreImageDatabase.dataStoreKey, ArCoreImg.BuildDb(library));
}
catch (ArCoreImg.MissingTextureException e)
{
Rethrow(library, $"{nameof(XRReferenceImage)} named '{e.referenceImage.name}' is missing a texture.", e);
}
catch (ArCoreImg.EncodeToPNGFailedException e)
{
Rethrow(library, $"{nameof(XRReferenceImage)} named '{e.referenceImage.name}' could not be encoded to a PNG. Please check other errors in the console window.", e);
}
catch (ArCoreImg.BuildDatabaseFailedException e)
{
Rethrow(library, $"The arcoreimg command line tool exited with code ({e.exitCode}) and stderr:\n{e.stdErr}", e);
}
catch (ArCoreImg.EmptyDatabaseException e)
{
Rethrow(library, $"The arcoreimg command line tool ran successfully but did not produce an image database. This is likely a bug. Please provide these details to Unity:\n=== begin arcoreimg output ===\nstdout:\n{e.stdOut}\nstderr:\n{e.stdErr}\n=== end arcoreimg output===\n", e);
}
}
}
void BuildImageTrackingAssets()
{
if (Directory.Exists(Application.streamingAssetsPath))
{
s_ShouldDeleteStreamingAssetsFolder = false;
}
else
{
// Delete the streaming assets folder at the end of the build pipeline
// since it did not exist before we created it here.
s_ShouldDeleteStreamingAssetsFolder = true;
Directory.CreateDirectory(Application.streamingAssetsPath);
}
if (!Directory.Exists(ARCoreImageTrackingProvider.k_StreamingAssetsPath))
{
Directory.CreateDirectory(ARCoreImageTrackingProvider.k_StreamingAssetsPath);
}
try
{
string[] libGuids = AssetDatabase.FindAssets("t:xrReferenceImageLibrary");
if (libGuids == null || libGuids.Length == 0)
{
return;
}
// This is how much each library will contribute to the overall progress
var progressPerLibrary = 1f / libGuids.Length;
const string progressBarText = "Building ARCore Image Library";
for (int libraryIndex = 0; libraryIndex < libGuids.Length; ++libraryIndex)
{
var libGuid = libGuids[libraryIndex];
var overallProgress = progressPerLibrary * libraryIndex;
var numSteps = libGuids.Length + 1; // 1 per image plus arcoreimg
var libraryPath = AssetDatabase.GUIDToAssetPath(libGuid);
var imageLib = AssetDatabase.LoadAssetAtPath <XRReferenceImageLibrary>(libraryPath);
EditorUtility.DisplayProgressBar(progressBarText, imageLib.name, overallProgress);
var tempDirectory = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString("N"));
var inputImageListPath = Path.Combine(tempDirectory, Guid.NewGuid().ToString("N") + ".txt");
// prepare text file for arcoreimg to read from
try
{
Directory.CreateDirectory(tempDirectory);
using (var writer = new StreamWriter(inputImageListPath, false))
{
for (int i = 0; i < imageLib.count; i++)
{
var referenceImage = imageLib[i];
var textureGuid = referenceImage.textureGuid.ToString("N");
var assetPath = AssetDatabase.GUIDToAssetPath(textureGuid);
var referenceImageName = referenceImage.guid.ToString("N");
EditorUtility.DisplayProgressBar(
progressBarText,
imageLib.name + ": " + assetPath,
overallProgress + progressPerLibrary * i / numSteps);
var texture = AssetDatabase.LoadAssetAtPath <Texture2D>(assetPath);
if (texture == null)
{
throw new BuildFailedException(string.Format(
"ARCore Image Library Generation: Reference library at '{0}' is missing a texture at index {1}.",
libraryPath, i));
}
var extension = Path.GetExtension(assetPath);
var entry = new StringBuilder();
if (string.Equals(extension, ".jpg", StringComparison.OrdinalIgnoreCase) ||
string.Equals(extension, ".png", StringComparison.OrdinalIgnoreCase))
{
entry.Append(referenceImageName).Append('|').Append(Path.GetFullPath(assetPath));
}
else
{
var pngFilename = Path.Combine(tempDirectory, textureGuid + ".png");
var bytes = ImageConversion.EncodeToPNG(texture);
if (bytes == null)
{
throw new BuildFailedException(string.Format(
"ARCore Image Library Generation: Texture format for image '{0}' not supported. Inspect other error messages emitted during this build for more details.",
texture.name));
}
File.WriteAllBytes(pngFilename, bytes);
entry.Append(referenceImageName).Append('|').Append(pngFilename);
}
if (referenceImage.specifySize)
{
entry.Append('|').Append(referenceImage.width.ToString("G", CultureInfo.InvariantCulture));
}
writer.WriteLine(entry.ToString());
}
}
}
catch
{
Directory.Delete(tempDirectory, true);
throw;
}
// launch arcoreimg and wait for it to return so we can process the asset
try
{
EditorUtility.DisplayProgressBar(
progressBarText,
imageLib.name + ": Invoking arcoreimg",
overallProgress + progressPerLibrary * (numSteps - 1) / numSteps);
// This file must have the .imgdb extension (the tool adds it otherwise)
var outputDbPath = ARCoreImageTrackingProvider.GetPathForLibrary(imageLib);
if (File.Exists(outputDbPath))
{
File.Delete(outputDbPath);
}
var(stdOut, stdErr, _) = ArCoreImg.BuildDb(inputImageListPath, outputDbPath);
if (!File.Exists(outputDbPath))
{
throw new BuildFailedException(
$"Failed to generate image database. Output from arcoreimg:\n\nstdout:\n{stdOut}\n====\n\nstderr:\n{stdErr}\n====");
}
}
catch
{
Debug.LogError($"Failed to generated ARCore reference image library '{imageLib.name}'");
throw;
}
finally
{
Directory.Delete(tempDirectory, true);
}
}
}
catch
{
RemoveGeneratedStreamingAssets();
throw;
}
}