Implement experimental Vulkan backend

Source/Core/VideoBackends/Vulkan/PaletteTextureConverter.h

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+// Copyright 2016 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+
+#include "VideoBackends/Vulkan/StreamBuffer.h"
+
+#include "VideoCommon/TextureDecoder.h"
+
+namespace Vulkan
+{
+class StateTracker;
+class Texture2D;
+
+// Since this converter uses a uniform texel buffer, we can't use the general pipeline generators.
+
+class PaletteTextureConverter
+{
+public:
+  PaletteTextureConverter();
+  ~PaletteTextureConverter();
+
+  bool Initialize();
+
+  void ConvertTexture(StateTracker* state_tracker, VkRenderPass render_pass,
+                      VkFramebuffer dst_framebuffer, Texture2D* src_texture, u32 width, u32 height,
+                      void* palette, TlutFormat format);
+
+private:
+  static const size_t NUM_PALETTE_CONVERSION_SHADERS = 3;
+
+  bool CreateBuffers();
+  bool CompileShaders();
+  bool CreateDescriptorLayout();
+
+  VkDescriptorSetLayout m_palette_set_layout = VK_NULL_HANDLE;
+  VkPipelineLayout m_pipeline_layout = VK_NULL_HANDLE;
+
+  std::array<VkShaderModule, NUM_PALETTE_CONVERSION_SHADERS> m_shaders = {};
+
+  std::unique_ptr<StreamBuffer> m_palette_stream_buffer;
+  VkBufferView m_palette_buffer_view = VK_NULL_HANDLE;
+
+  std::unique_ptr<StreamBuffer> m_uniform_buffer;
+};
+
+}  // namespace Vulkan