Initial vulkan context and immediate drawer.

Extremely rough, just checking in so DrChat can snoop.

src/xenia/ui/vulkan/vulkan_immediate_drawer.h

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+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2016 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_UI_VULKAN_VULKAN_IMMEDIATE_DRAWER_H_
+#define XENIA_UI_VULKAN_VULKAN_IMMEDIATE_DRAWER_H_
+
+#include <memory>
+
+#include "xenia/ui/immediate_drawer.h"
+#include "xenia/ui/vulkan/vulkan.h"
+
+namespace xe {
+namespace ui {
+namespace vulkan {
+
+class LightweightCircularBuffer;
+class VulkanContext;
+
+class VulkanImmediateDrawer : public ImmediateDrawer {
+ public:
+  VulkanImmediateDrawer(VulkanContext* graphics_context);
+  ~VulkanImmediateDrawer() override;
+
+  std::unique_ptr<ImmediateTexture> CreateTexture(uint32_t width,
+                                                  uint32_t height,
+                                                  ImmediateTextureFilter filter,
+                                                  bool repeat,
+                                                  const uint8_t* data) override;
+  void UpdateTexture(ImmediateTexture* texture, const uint8_t* data) override;
+
+  void Begin(int render_target_width, int render_target_height) override;
+  void BeginDrawBatch(const ImmediateDrawBatch& batch) override;
+  void Draw(const ImmediateDraw& draw) override;
+  void EndDrawBatch() override;
+  void End() override;
+
+ private:
+  VulkanContext* context_ = nullptr;
+
+  struct {
+    VkSampler nearest_clamp = nullptr;
+    VkSampler nearest_repeat = nullptr;
+    VkSampler linear_clamp = nullptr;
+    VkSampler linear_repeat = nullptr;
+  } samplers_;
+
+  VkDescriptorSetLayout texture_set_layout_ = nullptr;
+  VkDescriptorPool descriptor_pool_ = nullptr;
+  VkPipelineLayout pipeline_layout_ = nullptr;
+  VkPipeline triangle_pipeline_ = nullptr;
+  VkPipeline line_pipeline_ = nullptr;
+
+  std::unique_ptr<LightweightCircularBuffer> circular_buffer_;
+
+  bool batch_has_index_buffer_ = false;
+  VkCommandBuffer current_cmd_buffer_ = nullptr;
+};
+
+}  // namespace vulkan
+}  // namespace ui
+}  // namespace xe
+
+#endif  // XENIA_UI_VULKAN_VULKAN_IMMEDIATE_DRAWER_H_