Add automatic generation of mipmaps to Vulkan

src/gpu/vk/GrVkCaps.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrVkCaps.h"
 
 #include "GrVkUtil.h"
 #include "glsl/GrGLSLCaps.h"
 #include "vk/GrVkInterface.h"
 #include "vk/GrVkBackendContext.h"
 
 GrVkCaps::GrVkCaps(const GrContextOptions& contextOptions, const GrVkInterface* vkInterface,
                    VkPhysicalDevice physDev, uint32_t featureFlags, uint32_t extensionFlags)
     : INHERITED(contextOptions) {
     fCanUseGLSLForShaderModule = false;
 
     /**************************************************************************
     * GrDrawTargetCaps fields
     **************************************************************************/
-    fMipMapSupport = false; //TODO: figure this out
+    fMipMapSupport = true;   // always available in Vulkan
     fNPOTTextureTileSupport = false; //TODO: figure this out
     fTwoSidedStencilSupport = false; //TODO: figure this out
     fStencilWrapOpsSupport = false; //TODO: figure this out
     fDiscardRenderTargetSupport = false; //TODO: figure this out
     fReuseScratchTextures = true; //TODO: figure this out
     fGpuTracingSupport = false; //TODO: figure this out
     fCompressedTexSubImageSupport = false; //TODO: figure this out
     fOversizedStencilSupport = false; //TODO: figure this out
 
     fUseDrawInsteadOfClear = false; //TODO: figure this out
@@ skipping 203 matching lines @@
 
 void GrVkCaps::ConfigInfo::init(const GrVkInterface* interface,
                                 VkPhysicalDevice physDev,
                                 VkFormat format) {
     VkFormatProperties props;
     memset(&props, 0, sizeof(VkFormatProperties));
     GR_VK_CALL(interface, GetPhysicalDeviceFormatProperties(physDev, format, &props));
     InitConfigFlags(props.linearTilingFeatures, &fLinearFlags);
     InitConfigFlags(props.optimalTilingFeatures, &fOptimalFlags);
 }