Added Vulkan Descriptor Sets and Samplers.

gpu/vulkan/vulkan_sampler.h

+// Copyright (c) 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef GPU_VULKAN_VULKAN_SAMPLER_H_
+#define GPU_VULKAN_VULKAN_SAMPLER_H_
+
+#include <float.h>
+#include <vulkan/vulkan.h>
+
+#include "base/macros.h"
+#include "gpu/vulkan/vulkan_export.h"
+
+namespace gpu {
+
+class VulkanDeviceQueue;
+
+class VULKAN_EXPORT VulkanSampler {
+ public:
+  struct SamplerOptions {
+    SamplerOptions();
+    ~SamplerOptions();
+
+    VkFilter mag_filter = VK_FILTER_NEAREST;
+    VkFilter min_filter = VK_FILTER_NEAREST;
+    VkSamplerMipmapMode mipmap_mode = VK_SAMPLER_MIPMAP_MODE_NEAREST;
+    VkSamplerAddressMode address_mode_u = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
+    VkSamplerAddressMode address_mode_v = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
+    VkSamplerAddressMode address_mode_w = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
+    float mip_lod_bias = 0.0f;
+    bool anisotropy_enable = false;
+    float max_anisotropy = 0.0f;

[piman, 2016/05/18 19:02:18]

nit: 1.0f (values < 1.0f don't really make sense)

[David Yen, 2016/05/18 21:08:35]

Done.

+    bool compare_enable = false;
+    VkCompareOp compare_op = VK_COMPARE_OP_NEVER;
+    float min_lod = 0.0f;
+    float max_lod = FLT_MAX;
+    VkBorderColor border_color = VK_BORDER_COLOR_FLOAT_TRANSPARENT_BLACK;
+    bool unnormalized_coordinates = false;
+  };
+
+  explicit VulkanSampler(VulkanDeviceQueue* device_queue);
+  ~VulkanSampler();
+
+  bool Initialize(const SamplerOptions& options);
+  void Destroy();
+
+  VkSampler handle() const { return handle_; }
+
+ private:
+  VulkanDeviceQueue* device_queue_ = nullptr;
+  VkSampler handle_ = VK_NULL_HANDLE;
+
+  DISALLOW_COPY_AND_ASSIGN(VulkanSampler);
+};
+
+}  // namespace gpu
+
+#endif  // GPU_VULKAN_VULKAN_SAMPLER_H_