WIP rough sketch of vulkan backend structure.

src/xenia/ui/vulkan/fenced_pools.cc

@@ -0,0 +1,81 @@
+/**
+ ******************************************************************************
+ * 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. *
+ ******************************************************************************
+ */
+
+#include "xenia/ui/vulkan/fenced_pools.h"
+
+#include "xenia/base/assert.h"
+#include "xenia/base/math.h"
+#include "xenia/ui/vulkan/vulkan_util.h"
+
+namespace xe {
+namespace ui {
+namespace vulkan {
+
+using xe::ui::vulkan::CheckResult;
+
+CommandBufferPool::CommandBufferPool(VkDevice device,
+                                     uint32_t queue_family_index,
+                                     VkCommandBufferLevel level)
+    : BaseFencedPool(device), level_(level) {
+  // Create the pool used for allocating buffers.
+  // They are marked as transient (short-lived) and cycled frequently.
+  VkCommandPoolCreateInfo cmd_pool_info;
+  cmd_pool_info.sType = VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO;
+  cmd_pool_info.pNext = nullptr;
+  cmd_pool_info.flags = VK_COMMAND_POOL_CREATE_TRANSIENT_BIT |
+                        VK_COMMAND_POOL_CREATE_RESET_COMMAND_BUFFER_BIT;
+  cmd_pool_info.queueFamilyIndex = queue_family_index;
+  auto err =
+      vkCreateCommandPool(device_, &cmd_pool_info, nullptr, &command_pool_);
+  CheckResult(err, "vkCreateCommandPool");
+
+  // Allocate a bunch of command buffers to start.
+  constexpr uint32_t kDefaultCount = 32;
+  VkCommandBufferAllocateInfo command_buffer_info;
+  command_buffer_info.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
+  command_buffer_info.pNext = nullptr;
+  command_buffer_info.commandPool = command_pool_;
+  command_buffer_info.level = level;
+  command_buffer_info.commandBufferCount = kDefaultCount;
+  VkCommandBuffer command_buffers[kDefaultCount];
+  err =
+      vkAllocateCommandBuffers(device_, &command_buffer_info, command_buffers);
+  CheckResult(err, "vkCreateCommandBuffer");
+  for (size_t i = 0; i < xe::countof(command_buffers); ++i) {
+    PushEntry(command_buffers[i]);
+  }
+}
+
+CommandBufferPool::~CommandBufferPool() {
+  vkDestroyCommandPool(device_, command_pool_, nullptr);
+  command_pool_ = nullptr;
+}
+
+VkCommandBuffer CommandBufferPool::AllocateEntry() {
+  // TODO(benvanik): allocate a bunch at once?
+  VkCommandBufferAllocateInfo command_buffer_info;
+  command_buffer_info.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
+  command_buffer_info.pNext = nullptr;
+  command_buffer_info.commandPool = command_pool_;
+  command_buffer_info.level = level_;
+  command_buffer_info.commandBufferCount = 1;
+  VkCommandBuffer command_buffer;
+  auto err =
+      vkAllocateCommandBuffers(device_, &command_buffer_info, &command_buffer);
+  CheckResult(err, "vkCreateCommandBuffer");
+  return command_buffer;
+}
+
+void CommandBufferPool::FreeEntry(VkCommandBuffer handle) {
+  vkFreeCommandBuffers(device_, command_pool_, 1, &handle);
+}
+
+}  // namespace vulkan
+}  // namespace ui
+}  // namespace xe