1 /* Copyright (c) 2017-2018 Hans-Kristian Arntzen
2  *
3  * Permission is hereby granted, free of charge, to any person obtaining
4  * a copy of this software and associated documentation files (the
5  * "Software"), to deal in the Software without restriction, including
6  * without limitation the rights to use, copy, modify, merge, publish,
7  * distribute, sublicense, and/or sell copies of the Software, and to
8  * permit persons to whom the Software is furnished to do so, subject to
9  * the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be
12  * included in all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
15  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
16  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
17  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
18  * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
19  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
20  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
21  */
22 
23 #pragma once
24 
25 #include "vulkan.hpp"
26 #include "intrusive.hpp"
27 #include <vector>
28 
29 namespace Vulkan
30 {
31 class Device;
32 class Buffer;
33 
34 struct BufferBlockAllocation
35 {
36 	uint8_t *host;
37 	VkDeviceSize offset;
38 };
39 
40 struct BufferBlock
41 {
42 	~BufferBlock();
43 	Util::IntrusivePtr<Buffer> gpu;
44 	Util::IntrusivePtr<Buffer> cpu;
45 	VkDeviceSize offset = 0;
46 	VkDeviceSize alignment = 0;
47 	VkDeviceSize size = 0;
48 	uint8_t *mapped = nullptr;
49 
allocateVulkan::BufferBlock50 	BufferBlockAllocation allocate(VkDeviceSize allocate_size)
51 	{
52 		auto aligned_offset = (offset + alignment - 1) & ~(alignment - 1);
53 		if (aligned_offset + allocate_size <= size)
54 		{
55 			auto *ret = mapped + aligned_offset;
56 			offset = aligned_offset + allocate_size;
57 			return { ret, aligned_offset };
58 		}
59 		else
60 			return { nullptr, 0 };
61 	}
62 };
63 
64 class BufferPool
65 {
66 public:
67 	~BufferPool();
68 	void init(Device *device, VkDeviceSize block_size, VkDeviceSize alignment, VkBufferUsageFlags usage, bool need_device_local);
69 	void reset();
70 
get_block_size() const71 	VkDeviceSize get_block_size() const
72 	{
73 		return block_size;
74 	}
75 
76 	BufferBlock request_block(VkDeviceSize minimum_size);
77 	void recycle_block(BufferBlock &&block);
78 
79 private:
80 	Device *device = nullptr;
81 	VkDeviceSize block_size = 0;
82 	VkDeviceSize alignment = 0;
83 	VkBufferUsageFlags usage = 0;
84 	std::vector<BufferBlock> blocks;
85 	BufferBlock allocate_block(VkDeviceSize size);
86 	bool need_device_local = false;
87 };
88 }