Enable tri-linear and NPOT-tiling support in Vulkan

src/gpu/vk/GrVkSampler.cpp

 /*
 * Copyright 2016 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
 #include "GrVkSampler.h"
 
 #include "GrTextureAccess.h"
@@ skipping 26 matching lines @@
         VK_FILTER_LINEAR
     };
 
     VkSamplerCreateInfo createInfo;
     memset(&createInfo, 0, sizeof(VkSamplerCreateInfo));
     createInfo.sType = VK_STRUCTURE_TYPE_SAMPLER_CREATE_INFO;
     createInfo.pNext = 0;
     createInfo.flags = 0;
     createInfo.magFilter = vkMagFilterModes[params.filterMode()];
     createInfo.minFilter = vkMinFilterModes[params.filterMode()];
-    createInfo.mipmapMode = VK_SAMPLER_MIPMAP_MODE_NEAREST;
+    createInfo.mipmapMode = VK_SAMPLER_MIPMAP_MODE_LINEAR;
     createInfo.addressModeU = tile_to_vk_sampler_address(params.getTileModeX());
     createInfo.addressModeV = tile_to_vk_sampler_address(params.getTileModeY());
     createInfo.addressModeW = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE; // Shouldn't matter
     createInfo.mipLodBias = 0.0f;
     createInfo.anisotropyEnable = VK_FALSE;
     createInfo.maxAnisotropy = 1.0f;
     createInfo.compareEnable = VK_FALSE;
     createInfo.compareOp = VK_COMPARE_OP_NEVER;
     // Vulkan doesn't have a direct mapping of GL's nearest or linear filters for minFilter since
     // there is always a mipmapMode. To get the same effect as GL we can set minLod = maxLod = 0.0.
@@ skipping 30 matching lines @@
     key |= (params.getTileModeX() << kTileModeXShift);
 
     GR_STATIC_ASSERT(SkShader::kTileModeCount <= 4);
     key |= (params.getTileModeY() << kTileModeYShift);
 
     SkASSERT(mipLevels < 1024);
     key |= (mipLevels << kMipLevelShift);
 
     return key;
 }