Add vulkan files into skia repo.

src/gpu/vk/GrVkSampler.cpp

Index: src/gpu/vk/GrVkSampler.cpp
diff --git a/src/gpu/vk/GrVkSampler.cpp b/src/gpu/vk/GrVkSampler.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..d50c7f37447a5a9da0b3c9010aa3e6024ed6bb6c
--- /dev/null
+++ b/src/gpu/vk/GrVkSampler.cpp
@@ -0,0 +1,74 @@
+/*
+* 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"
+#include "GrVkGpu.h"
+
+static inline VkSamplerAddressMode tile_to_vk_sampler_address(SkShader::TileMode tm) {
+    static const VkSamplerAddressMode gWrapModes[] = {
+        VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE,
+        VK_SAMPLER_ADDRESS_MODE_REPEAT,
+        VK_SAMPLER_ADDRESS_MODE_MIRRORED_REPEAT
+    };
+    GR_STATIC_ASSERT(SkShader::kTileModeCount == SK_ARRAY_COUNT(gWrapModes));
+    GR_STATIC_ASSERT(0 == SkShader::kClamp_TileMode);
+    GR_STATIC_ASSERT(1 == SkShader::kRepeat_TileMode);
+    GR_STATIC_ASSERT(2 == SkShader::kMirror_TileMode);
+    return gWrapModes[tm];
+}
+
+GrVkSampler* GrVkSampler::Create(const GrVkGpu* gpu, const GrTextureAccess& textureAccess) {
+
+    static VkFilter vkMinFilterModes[] = {
+        VK_FILTER_NEAREST,
+        VK_FILTER_LINEAR,
+        VK_FILTER_LINEAR
+    };
+    static VkFilter vkMagFilterModes[] = {
+        VK_FILTER_NEAREST,
+        VK_FILTER_LINEAR,
+        VK_FILTER_LINEAR
+    };
+
+    const GrTextureParams& params = textureAccess.getParams();
+
+    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.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;
+    createInfo.minLod = 0.0f;
+    createInfo.maxLod = 0.0f;
+    createInfo.borderColor = VK_BORDER_COLOR_FLOAT_TRANSPARENT_BLACK;
+    createInfo.unnormalizedCoordinates = VK_FALSE;
+
+    VkSampler sampler;
+    GR_VK_CALL_ERRCHECK(gpu->vkInterface(), CreateSampler(gpu->device(),
+                                                          &createInfo,
+                                                          nullptr,
+                                                          &sampler));
+
+    return new GrVkSampler(sampler);
+}
+
+void GrVkSampler::freeGPUData(const GrVkGpu* gpu) const {
+    SkASSERT(fSampler);
+    GR_VK_CALL(gpu->vkInterface(), DestroySampler(gpu->device(), fSampler, nullptr));
+}