d3dcompiler_qt: Remove directory creation inside the proxy library

Use of mkpath/mkdir is removed in order to make the proxy less
invasive when there is no compiler service running. Creation of the
directory structure is fully the service's responsibility.
Service availability is now only checked once, at the first invocation of
D3DCompile, as it is expected to be started before the application.

Change-Id: Ib8c4f062c418497c2253daf524654e1db30dae47
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

1 files changed, 45 insertions, 49 deletions

diff --git a/src/angle/src/d3dcompiler/main.cpp b/src/angle/src/d3dcompiler/main.cpp
index 70a8f30fb0..3f00df63eb 100644
--- a/src/angle/src/d3dcompiler/main.cpp
+++ b/src/angle/src/d3dcompiler/main.cpp
@@ -161,31 +161,11 @@ static bool loadCompiler()
     return bool(compile);
 }
 
-static bool serviceAvailable(const QString &path)
-{
-    if (path.isEmpty())
-        return false;
-
-    // Look for a file, "control", and check if it has been touched in the last 60 seconds
-    QFileInfo control(path + QStringLiteral("control"));
-    return control.exists() && control.lastModified().secsTo(QDateTime::currentDateTime()) < 60;
-}
-
 static QString cacheKeyFor(const void *data)
 {
     return QString::fromUtf8(QCryptographicHash::hash(reinterpret_cast<const char *>(data), QCryptographicHash::Sha1).toHex());
 }
 
-static QString makePath(const QDir &parent, const QString &child)
-{
-    const QString path = parent.absoluteFilePath(child);
-    if (!parent.mkpath(child)) {
-        qCWarning(QT_D3DCOMPILER) << "Path is inaccessible: " << path;
-        return QString();
-    }
-    return path;
-}
-
 } // namespace D3DCompiler
 
 #ifdef __MINGW32__
@@ -200,37 +180,56 @@ HRESULT WINAPI D3DCompile(
         const D3D_SHADER_MACRO *defines, ID3DInclude *include, const char *entrypoint,
         const char *target, UINT sflags, UINT eflags, ID3DBlob **shader, ID3DBlob **errorMsgs)
 {
-    static QString basePath;
+    static bool initialized = false;
+    static bool serviceAvailable = false;
     static QString binaryPath;
     static QString sourcePath;
-    if (basePath.isEmpty()) {
-        QDir base;
-        if (qEnvironmentVariableIsSet("QT_D3DCOMPILER_DIR"))
-            base.setPath(QString::fromUtf8(qgetenv("QT_D3DCOMPILER_DIR")));
-        else
-            base.setPath(QStandardPaths::writableLocation(QStandardPaths::DataLocation));
-
-        if (!base.exists() && !base.mkdir(QStringLiteral("."))) {
-            qCWarning(QT_D3DCOMPILER) << "D3D compiler base directory does not exist: " << QDir::toNativeSeparators(base.path());
+    if (!initialized) {
+        QString base;
+        if (qEnvironmentVariableIsSet("QT_D3DCOMPILER_DIR")) {
+            base = QString::fromLocal8Bit(qgetenv("QT_D3DCOMPILER_DIR"));
         } else {
-            const QString path = base.absoluteFilePath(QStringLiteral("d3dcompiler/"));
-            if (!QFile::exists(path) && !base.mkdir(QStringLiteral("d3dcompiler")))
-                qCWarning(QT_D3DCOMPILER) << "D3D compiler path could not be created: " << QDir::toNativeSeparators(path);
-            else
-                basePath = path;
+            const QString location = QStandardPaths::writableLocation(QStandardPaths::DataLocation);
+            if (!location.isEmpty())
+                base = location + QStringLiteral("/d3dcompiler");
         }
-    }
 
-    if (!basePath.isEmpty()) {
-        binaryPath = D3DCompiler::makePath(basePath, QStringLiteral("binary/"));
-        sourcePath = D3DCompiler::makePath(basePath, QStringLiteral("source/"));
+        QDir baseDir(base);
+        if (!base.isEmpty() && baseDir.exists()) {
+            // Check if we have can read/write blobs
+            if (baseDir.exists(QStringLiteral("binary"))) {
+                binaryPath = baseDir.absoluteFilePath(QStringLiteral("binary/"));
+            } else {
+                qCWarning(QT_D3DCOMPILER) << "D3D compiler base directory exists, but the binary directory does not.\n"
+                                             "Check the compiler service.";
+            }
+
+            // Check if we can write shader source
+            if (baseDir.exists(QStringLiteral("source"))) {
+                sourcePath = baseDir.absoluteFilePath(QStringLiteral("source/"));
+            } else {
+                qCWarning(QT_D3DCOMPILER) << "D3D compiler base directory exists, but the source directory does not.\n"
+                                             "Check the compiler service.";
+            }
+
+            // Look for a file, "control", and check if it has been touched in the last 60 seconds
+            QFileInfo control(baseDir.absoluteFilePath(QStringLiteral("control")));
+            serviceAvailable = control.exists() && control.lastModified().secsTo(QDateTime::currentDateTime()) < 60;
+        } else {
+            qCWarning(QT_D3DCOMPILER) << "D3D compiler base directory does not exist:"
+                                      << QDir::toNativeSeparators(base)
+                                      << "\nThe compiler service won't be used.";
+        }
+
+        initialized = true;
     }
 
-    // Check if pre-compiled shader blob is available
     const QByteArray sourceData = QByteArray::fromRawData(reinterpret_cast<const char *>(data), data_size);
     const QString cacheKey = D3DCompiler::cacheKeyFor(sourceData);
-    QFile blob(binaryPath + cacheKey);
-    if (!binaryPath.isEmpty() && blob.exists()) {
+
+    // Check if pre-compiled shader blob is available
+    if (!binaryPath.isEmpty()) {
+        QFile blob(binaryPath + cacheKey);
         if (blob.open(QFile::ReadOnly)) {
             qCDebug(QT_D3DCOMPILER) << "Opening precompiled shader blob at" << blob.fileName();
             *shader = new D3DCompiler::Blob(blob.readAll());
@@ -240,13 +239,7 @@ HRESULT WINAPI D3DCompile(
     }
 
     // Shader blob is not available, compile with compilation service if possible
-    if (D3DCompiler::serviceAvailable(basePath)) {
-
-        if (sourcePath.isEmpty()) {
-            qCWarning(QT_D3DCOMPILER) << "Compiler service is available, but source directory is not writable.";
-            return E_ACCESSDENIED;
-        }
-
+    if (!sourcePath.isEmpty() && serviceAvailable) {
         // Dump source to source path; wait for blob to appear
         QFile source(sourcePath + cacheKey);
         if (!source.open(QFile::WriteOnly)) {
@@ -264,6 +257,7 @@ HRESULT WINAPI D3DCompile(
 
         QElapsedTimer timer;
         timer.start();
+        QFile blob(binaryPath + cacheKey);
         while (!(blob.exists() && blob.open(QFile::ReadOnly)) && timer.elapsed() < timeout)
             QThread::msleep(100);
 
@@ -285,6 +279,8 @@ HRESULT WINAPI D3DCompile(
         if (SUCCEEDED(hr) && !binaryPath.isEmpty()) {
             const QByteArray blobContents = QByteArray::fromRawData(
                         reinterpret_cast<const char *>((*shader)->GetBufferPointer()), (*shader)->GetBufferSize());
+
+            QFile blob(binaryPath + cacheKey);
             if (blob.open(QFile::WriteOnly) && blob.write(blobContents))
                 qCDebug(QT_D3DCOMPILER) << "Cached shader blob at" << blob.fileName();
             else