Add automatic generation of mipmaps to Vulkan

src/gpu/vk/GrVkResourceProvider.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 GrVkResourceProvider_DEFINED
 #define GrVkResourceProvider_DEFINED
 
@@ skipping 45 matching lines @@
     // Finds or creates a compatible GrVkDescriptorPool for the requested type and count.
     // The refcount is incremented and a pointer returned.
     // TODO: Currently this will just create a descriptor pool without holding onto a ref itself
     //       so we currently do not reuse them. Rquires knowing if another draw is currently using
     //       the GrVkDescriptorPool, the ability to reset pools, and the ability to purge pools out
     //       of our cache of GrVkDescriptorPools.
     GrVkDescriptorPool* findOrCreateCompatibleDescriptorPool(VkDescriptorType type, uint32_t count);
 
     // Finds or creates a compatible GrVkSampler based on the GrTextureParams.
     // The refcount is incremented and a pointer returned.
-    GrVkSampler* findOrCreateCompatibleSampler(const GrTextureParams&);
+    GrVkSampler* findOrCreateCompatibleSampler(const GrTextureParams&, uint32_t mipLevels);
 
     sk_sp<GrVkPipelineState> findOrCreateCompatiblePipelineState(const GrPipeline&,
                                                                  const GrPrimitiveProcessor&,
                                                                  GrPrimitiveType,
                                                                  const GrVkRenderPass& renderPass);
 
     // Destroy any cached resources. To be called before destroying the VkDevice.
     // The assumption is that all queues are idle and all command buffers are finished.
     // For resource tracing to work properly, this should be called after unrefing all other
     // resource usages.
@@ skipping 52 matching lines @@
 
     // Array of RenderPasses that only have a single color attachment, optional stencil attachment,
     // optional resolve attachment, and only one subpass
     SkSTArray<4, GrVkRenderPass*> fSimpleRenderPasses;
 
     // Array of CommandBuffers that are currently in flight
     SkSTArray<4, GrVkCommandBuffer*> fActiveCommandBuffers;
 
     // Stores GrVkSampler objects that we've already created so we can reuse them across multiple
     // GrVkPipelineStates
-    SkTDynamicHash<GrVkSampler, uint8_t> fSamplers;
+    SkTDynamicHash<GrVkSampler, uint16_t> fSamplers;
 
     // Cache of GrVkPipelineStates
     PipelineStateCache* fPipelineStateCache;
 };
 
 #endif