Merge commit 'd94eccab99da355a1ad43494aec3c479b13b35dc' as 'external/parallel-rdp/parallel-rdp-standalone'

external/parallel-rdp/parallel-rdp-standalone/vulkan/buffer_pool.hpp

@@ -0,0 +1,96 @@
+/* Copyright (c) 2017-2023 Hans-Kristian Arntzen
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#pragma once
+
+#include "vulkan_headers.hpp"
+#include "intrusive.hpp"
+#include <vector>
+#include <algorithm>
+
+namespace Vulkan
+{
+class Device;
+class Buffer;
+
+struct BufferBlockAllocation
+{
+	uint8_t *host;
+	Util::IntrusivePtr<Buffer> buffer;
+	VkDeviceSize offset;
+	VkDeviceSize padded_size;
+};
+
+class BufferBlock
+{
+public:
+	~BufferBlock();
+
+	BufferBlockAllocation allocate(VkDeviceSize allocate_size);
+	inline bool is_mapped() const { return mapped != nullptr; }
+	const Buffer &get_buffer() const { return *buffer; }
+	void unmap(Device &device);
+
+	inline VkDeviceSize get_offset() const { return offset; }
+	inline VkDeviceSize get_size() const { return size; }
+
+private:
+	friend class BufferPool;
+	Util::IntrusivePtr<Buffer> buffer;
+	VkDeviceSize offset = 0;
+	VkDeviceSize alignment = 0;
+	VkDeviceSize size = 0;
+	VkDeviceSize spill_size = 0;
+	uint8_t *mapped = nullptr;
+};
+
+class BufferPool
+{
+public:
+	~BufferPool();
+	void init(Device *device, VkDeviceSize block_size, VkDeviceSize alignment, VkBufferUsageFlags usage);
+	void reset();
+
+	// Used for allocating UBOs, where we want to specify a fixed size for range,
+	// and we need to make sure we don't allocate beyond the block.
+	void set_spill_region_size(VkDeviceSize spill_size);
+	void set_max_retained_blocks(size_t max_blocks);
+
+	VkDeviceSize get_block_size() const
+	{
+		return block_size;
+	}
+
+	BufferBlock request_block(VkDeviceSize minimum_size);
+	void recycle_block(BufferBlock &block);
+
+private:
+	Device *device = nullptr;
+	VkDeviceSize block_size = 0;
+	VkDeviceSize alignment = 0;
+	VkDeviceSize spill_size = 0;
+	VkBufferUsageFlags usage = 0;
+	size_t max_retained_blocks = 0;
+	std::vector<BufferBlock> blocks;
+	BufferBlock allocate_block(VkDeviceSize size);
+};
+}