Revise layer, extension and feature setup for Vulkan

src/gpu/vk/GrVkExtensions.h

 /*
  * 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 "vulkan/vulkan.h"
 
 /**
- * This helper queries the current Vulkan context for its extensions and layers, remembers them, 
+ * 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() : fInitialized(false)
-                     , fInstanceExtensionStrings(new SkTArray<SkString>)
+    GrVkExtensions() : fInstanceExtensionStrings(new SkTArray<SkString>)
                      , fDeviceExtensionStrings(new SkTArray<SkString>)
                      , fInstanceLayerStrings(new SkTArray<SkString>)
                      , fDeviceLayerStrings(new SkTArray<SkString>) {}
-
-    GrVkExtensions(const GrVkExtensions&);
-
-    GrVkExtensions& operator=(const GrVkExtensions&);
-
-    void swap(GrVkExtensions* that) {
-        fInstanceExtensionStrings.swap(that->fInstanceExtensionStrings);
-        fDeviceExtensionStrings.swap(that->fDeviceExtensionStrings);
-        fInstanceLayerStrings.swap(that->fInstanceLayerStrings);
-        fDeviceLayerStrings.swap(that->fDeviceLayerStrings);
-
-        SkTSwap(fInitialized, that->fInitialized);
-    }
+     
+    bool initInstance(uint32_t specVersion);
+    bool initDevice(uint32_t specVersion, VkInstance, VkPhysicalDevice);
 
     /**
-     * We sometimes need to use this class without having yet created a GrVkInterface. 
-     */
-    bool init(uint32_t specVersion,
-              VkPhysicalDevice physDev,
-              PFN_vkEnumerateInstanceExtensionProperties enumerateInstanceExtensionProperties,
-              PFN_vkEnumerateDeviceExtensionProperties enumerateDeviceExtensionProperties,
-              PFN_vkEnumerateInstanceLayerProperties enumerateInstanceLayerProperties,
-              PFN_vkEnumerateDeviceLayerProperties enumerateDeviceLayerProperties);
-
-    bool isInitialized() const { return fInitialized; }
-
-    /**
-     * Queries whether an extension or layer is present. Will fail if init() has not been called.
+     * 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;
 
-    /**
-     * Removes an extension or layer if present. Returns true if it was present before the call.
-     */
-    bool removeInstanceExtension(const char[]);
-    bool removeDeviceExtension(const char[]);
-    bool removeInstanceLayer(const char[]);
-    bool removeDeviceLayer(const char[]);
-
-    /**
-     * Adds an extension or layer to list
-     */
-    void addInstanceExtension(const char[]);
-    void addDeviceExtension(const char[]);
-    void addInstanceLayer(const char[]);
-    void addDeviceLayer(const char[]);
-
-    void reset() {
-        fInstanceExtensionStrings->reset();
-        fDeviceExtensionStrings->reset();
-        fInstanceLayerStrings->reset();
-        fDeviceLayerStrings->reset();
-    }
-
     void print(const char* sep = "\n") const;
 
 private:
-    bool                                fInitialized;
     SkAutoTDelete<SkTArray<SkString> >  fInstanceExtensionStrings;
     SkAutoTDelete<SkTArray<SkString> >  fDeviceExtensionStrings;
     SkAutoTDelete<SkTArray<SkString> >  fInstanceLayerStrings;
     SkAutoTDelete<SkTArray<SkString> >  fDeviceLayerStrings;
 };
 
 #endif