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annotate src/zamikongine/mesh.nim @ 19:b55d6ecde79d

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did: introduce scene graph, meshs and generic vertex buffers
author Sam <sam@basx.dev>
date Mon, 09 Jan 2023 11:04:19 +0700
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children beb86492b178
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19
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1 import std/typetraits
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2
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3 import ./vulkan
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4 import ./thing
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5 import ./buffer
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6 import ./vertex
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7
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8 type
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9 Mesh*[T] = object of Part
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10 vertexData*: T
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11 IndexedMesh*[T: object, U: uint16|uint32] = object of Part
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12 vertexData*: T
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13 indices*: seq[array[3, U]]
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14
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15 func getVkIndexType[T: object, U: uint16|uint32](m: IndexedMesh[T, U]): VkIndexType =
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16 when U is uint16: VK_INDEX_TYPE_UINT16
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17 elif U is uint32: VK_INDEX_TYPE_UINT32
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18
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19 proc createVertexBuffers*[M: Mesh|IndexedMesh](
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20 mesh: var M,
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21 device: VkDevice,
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22 physicalDevice: VkPhysicalDevice,
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23 commandPool: VkCommandPool,
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24 queue: VkQueue,
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25 useDeviceLocalBuffer: bool = true # decides if data is transfered to the fast device-local memory or not
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26 ): (seq[Buffer], uint32) =
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27 result[1] = mesh.vertexData.VertexCount
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28 for name, value in mesh.vertexData.fieldPairs:
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29 when typeof(value) is VertexAttribute:
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30 assert value.data.len > 0
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31 var flags = if useDeviceLocalBuffer: {TransferSrc} else: {VertexBuffer}
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32 var stagingBuffer = device.InitBuffer(physicalDevice, value.datasize, flags, {VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT, VK_MEMORY_PROPERTY_HOST_COHERENT_BIT})
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33 var d: pointer
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34 stagingBuffer.withMapping(d):
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35 copyMem(d, addr(value.data[0]), value.datasize)
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36
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37 if useDeviceLocalBuffer:
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38 var finalBuffer = device.InitBuffer(physicalDevice, value.datasize, {TransferDst, VertexBuffer}, {VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT})
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39 copyBuffer(commandPool, queue, stagingBuffer, finalBuffer, value.datasize)
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40 stagingBuffer.trash()
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41 result[0].add(finalBuffer)
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42 else:
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43 result[0].add(stagingBuffer)
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44
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45 proc createIndexBuffer*(
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46 mesh: var IndexedMesh,
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47 device: VkDevice,
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48 physicalDevice: VkPhysicalDevice,
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49 commandPool: VkCommandPool,
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50 queue: VkQueue,
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51 useDeviceLocalBuffer: bool = true # decides if data is transfered to the fast device-local memory or not
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52 ): Buffer =
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53 let bufferSize = uint64(mesh.indices.len * sizeof(get(genericParams(typeof(mesh.indices)), 0)))
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54 let flags = if useDeviceLocalBuffer: {TransferSrc} else: {IndexBuffer}
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55
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56 var stagingBuffer = device.InitBuffer(physicalDevice, bufferSize, flags, {VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT, VK_MEMORY_PROPERTY_HOST_COHERENT_BIT})
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57 var d: pointer
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58 stagingBuffer.withMapping(d):
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59 copyMem(d, addr(mesh.indices[0]), bufferSize)
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60
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61 if useDeviceLocalBuffer:
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62 var finalBuffer = device.InitBuffer(physicalDevice, bufferSize, {TransferDst, IndexBuffer}, {VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT})
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63 copyBuffer(commandPool, queue, stagingBuffer, finalBuffer, bufferSize)
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64 stagingBuffer.trash()
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65 return finalBuffer
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66 else:
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67 return stagingBuffer
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68
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69 proc createIndexedVertexBuffers*(
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70 mesh: var IndexedMesh,
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71 device: VkDevice,
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72 physicalDevice: VkPhysicalDevice,
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73 commandPool: VkCommandPool,
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74 queue: VkQueue,
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75 useDeviceLocalBuffer: bool = true # decides if data is transfered to the fast device-local memory or not
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76 ): (seq[Buffer], Buffer, uint32, VkIndexType) =
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77 result[0] = createVertexBuffers(mesh, device, physicalDevice, commandPool, queue, useDeviceLocalBuffer)[0]
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78 result[1] = createIndexBuffer(mesh, device, physicalDevice, commandPool, queue, useDeviceLocalBuffer)
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79 result[2] = uint32(mesh.indices.len * mesh.indices[0].len)
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80
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81 result[3] = getVkIndexType(mesh)