1 files changed, 50 insertions, 0 deletions
diff --git a/src/gpu/vk/GrVkExtensions.h b/src/gpu/vk/GrVkExtensions.h
new file mode 100644
index 0000000000..8de28f4d49
--- /dev/null
+++ b/src/gpu/vk/GrVkExtensions.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrVkExtensions_DEFINED
+#define GrVkExtensions_DEFINED
+
+#include "../private/SkTArray.h"
+#include "SkString.h"
+#include "vk/GrVkDefines.h"
+#include "vk/GrVkInterface.h"
+
+/**
+ * This helper queries the Vulkan driver for available extensions and layers, remembers them,
+ * and can be queried. It supports queries for both instance and device extensions and layers.
+ */
+class SK_API GrVkExtensions {
+public:
+    GrVkExtensions(GrVkInterface::GetProc getProc)
+                     : fGetProc(getProc)
+                     , fInstanceExtensionStrings(new SkTArray<SkString>)
+                     , fDeviceExtensionStrings(new SkTArray<SkString>)
+                     , fInstanceLayerStrings(new SkTArray<SkString>)
+                     , fDeviceLayerStrings(new SkTArray<SkString>) {}
+
+    bool initInstance(uint32_t specVersion);
+    bool initDevice(uint32_t specVersion, VkInstance, VkPhysicalDevice);
+
+    /**
+     * Queries whether an extension or layer is present. Will fail if not initialized.
+     */
+    bool hasInstanceExtension(const char[]) const;
+    bool hasDeviceExtension(const char[]) const;
+    bool hasInstanceLayer(const char[]) const;
+    bool hasDeviceLayer(const char[]) const;
+
+    void print(const char* sep = "\n") const;
+
+private:
+    GrVkInterface::GetProc fGetProc;
+    std::unique_ptr<SkTArray<SkString>>  fInstanceExtensionStrings;
+    std::unique_ptr<SkTArray<SkString>>  fDeviceExtensionStrings;
+    std::unique_ptr<SkTArray<SkString>>  fInstanceLayerStrings;
+    std::unique_ptr<SkTArray<SkString>>  fDeviceLayerStrings;
+};
+
+#endif