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comparison src/buffer.nim @ 18:90e117952f74

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add: basic vertex buffer functionality
author Sam <sam@basx.dev>
date Thu, 05 Jan 2023 01:16:48 +0700
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17:b40466fa446a 18:90e117952f74
1 import ./vulkan
2 import ./vulkan_helpers
3
4 type
5 BufferType* = enum
6 VertexBuffer = VK_BUFFER_USAGE_VERTEX_BUFFER_BIT
7 Buffer* = object
8 device*: VkDevice
9 vkBuffer*: VkBuffer
10 size*: uint64
11 memoryRequirements*: VkMemoryRequirements
12 memory*: VkDeviceMemory
13
14 proc findMemoryType(buffer: Buffer, physicalDevice: VkPhysicalDevice, properties: VkMemoryPropertyFlags): uint32 =
15 var physicalProperties: VkPhysicalDeviceMemoryProperties
16 vkGetPhysicalDeviceMemoryProperties(physicalDevice, addr(physicalProperties))
17
18 for i in 0'u32 ..< physicalProperties.memoryTypeCount:
19 if bool(buffer.memoryRequirements.memoryTypeBits and (1'u32 shl i)) and (uint32(physicalProperties.memoryTypes[i].propertyFlags) and uint32(properties)) == uint32(properties):
20 return i
21
22 proc InitBuffer*(device: VkDevice, physicalDevice: VkPhysicalDevice, size: uint64, bufferType: BufferType): Buffer =
23 result.device = device
24 result.size = size
25 var bufferInfo = VkBufferCreateInfo(
26 sType: VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
27 size: VkDeviceSize(result.size),
28 usage: VkBufferUsageFlags(bufferType),
29 sharingMode: VK_SHARING_MODE_EXCLUSIVE,
30
31 )
32 checkVkResult vkCreateBuffer(result.device, addr(bufferInfo), nil, addr(result.vkBuffer))
33 vkGetBufferMemoryRequirements(result.device, result.vkBuffer, addr(result.memoryRequirements))
34
35 var allocInfo = VkMemoryAllocateInfo(
36 sType: VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO,
37 allocationSize: result.memoryRequirements.size,
38 memoryTypeIndex: result.findMemoryType(
39 physicalDevice,
40 VkMemoryPropertyFlags(uint32(VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT) or uint32(VK_MEMORY_PROPERTY_HOST_COHERENT_BIT))
41 )
42 )
43 checkVkResult result.device.vkAllocateMemory(addr(allocInfo), nil, addr(result.memory))
44 checkVkResult result.device.vkBindBufferMemory(result.vkBuffer, result.memory, VkDeviceSize(0))
45
46
47 template withMapping*(buffer: Buffer, data: pointer, body: untyped): untyped =
48 checkVkResult buffer.device.vkMapMemory(buffer.memory, offset=VkDeviceSize(0), VkDeviceSize(buffer.size), VkMemoryMapFlags(0), addr(data));
49 body
50 buffer.device.vkUnmapMemory(buffer.memory);
51
52
53 proc `=copy`(a: var Buffer, b: Buffer){.error.}
54
55 proc `=destroy`*(buffer: var Buffer) =
56 vkDestroyBuffer(buffer.device, buffer.vkBuffer, nil)
57 vkFreeMemory(buffer.device, buffer.memory, nil);