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annotate src/zamikongine/mesh.nim @ 20:beb86492b178

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add: generate ubermeshes
author Sam <sam@basx.dev>
date Tue, 10 Jan 2023 00:23:40 +0700
parents b55d6ecde79d
children 94c38e4b5782
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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 createUberMesh*[T](meshes: openArray[Mesh[T]]): Mesh[T] =
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16 for mesh in meshes:
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17 for srcname, srcvalue in mesh.vertexData.fieldPairs:
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18 when typeof(srcvalue) is VertexAttribute:
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19 for dstname, dstvalue in result.vertexData.fieldPairs:
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20 when srcname == dstname:
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21 dstvalue.data.add srcvalue.data
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22
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23 func createUberMesh*[T: object, U: uint16|uint32](meshes: openArray[IndexedMesh[T, U]]): IndexedMesh[T, U] =
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24 var indexoffset = U(0)
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25 for mesh in meshes:
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26 for srcname, srcvalue in mesh.vertexData.fieldPairs:
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27 when typeof(srcvalue) is VertexAttribute:
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28 for dstname, dstvalue in result.vertexData.fieldPairs:
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29 when srcname == dstname:
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30 dstvalue.data.add srcvalue.data
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31 var indexdata: seq[array[3, U]]
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32 for i in mesh.indices:
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33 indexdata.add [i[0] + indexoffset, i[1] + indexoffset, i[2] + indexoffset]
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34 result.indices.add indexdata
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35 indexoffset += U(mesh.vertexData.VertexCount)
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36
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37 func getVkIndexType[T: object, U: uint16|uint32](m: IndexedMesh[T, U]): VkIndexType =
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38 when U is uint16: VK_INDEX_TYPE_UINT16
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39 elif U is uint32: VK_INDEX_TYPE_UINT32
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40
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41 proc createVertexBuffers*[M: Mesh|IndexedMesh](
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42 mesh: var M,
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43 device: VkDevice,
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44 physicalDevice: VkPhysicalDevice,
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45 commandPool: VkCommandPool,
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46 queue: VkQueue,
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47 useDeviceLocalBuffer: bool = true # decides if data is transfered to the fast device-local memory or not
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48 ): (seq[Buffer], uint32) =
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49 result[1] = mesh.vertexData.VertexCount
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50 for name, value in mesh.vertexData.fieldPairs:
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51 when typeof(value) is VertexAttribute:
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52 assert value.data.len > 0
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53 var flags = if useDeviceLocalBuffer: {TransferSrc} else: {VertexBuffer}
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54 var stagingBuffer = device.InitBuffer(physicalDevice, value.datasize, flags, {VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT, VK_MEMORY_PROPERTY_HOST_COHERENT_BIT})
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55 var d: pointer
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56 stagingBuffer.withMapping(d):
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57 copyMem(d, addr(value.data[0]), value.datasize)
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58
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59 if useDeviceLocalBuffer:
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60 var finalBuffer = device.InitBuffer(physicalDevice, value.datasize, {TransferDst, VertexBuffer}, {VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT})
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61 copyBuffer(commandPool, queue, stagingBuffer, finalBuffer, value.datasize)
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62 stagingBuffer.trash()
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63 result[0].add(finalBuffer)
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64 else:
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65 result[0].add(stagingBuffer)
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66
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67 proc createIndexBuffer*(
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68 mesh: var IndexedMesh,
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69 device: VkDevice,
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70 physicalDevice: VkPhysicalDevice,
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71 commandPool: VkCommandPool,
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72 queue: VkQueue,
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73 useDeviceLocalBuffer: bool = true # decides if data is transfered to the fast device-local memory or not
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74 ): Buffer =
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75 let bufferSize = uint64(mesh.indices.len * sizeof(get(genericParams(typeof(mesh.indices)), 0)))
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76 let flags = if useDeviceLocalBuffer: {TransferSrc} else: {IndexBuffer}
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77
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78 var stagingBuffer = device.InitBuffer(physicalDevice, bufferSize, flags, {VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT, VK_MEMORY_PROPERTY_HOST_COHERENT_BIT})
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79 var d: pointer
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80 stagingBuffer.withMapping(d):
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81 copyMem(d, addr(mesh.indices[0]), bufferSize)
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82
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83 if useDeviceLocalBuffer:
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84 var finalBuffer = device.InitBuffer(physicalDevice, bufferSize, {TransferDst, IndexBuffer}, {VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT})
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85 copyBuffer(commandPool, queue, stagingBuffer, finalBuffer, bufferSize)
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86 stagingBuffer.trash()
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87 return finalBuffer
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88 else:
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89 return stagingBuffer
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90
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91 proc createIndexedVertexBuffers*(
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92 mesh: var IndexedMesh,
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93 device: VkDevice,
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94 physicalDevice: VkPhysicalDevice,
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95 commandPool: VkCommandPool,
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96 queue: VkQueue,
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97 useDeviceLocalBuffer: bool = true # decides if data is transfered to the fast device-local memory or not
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98 ): (seq[Buffer], Buffer, uint32, VkIndexType) =
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99 result[0] = createVertexBuffers(mesh, device, physicalDevice, commandPool, queue, useDeviceLocalBuffer)[0]
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100 result[1] = createIndexBuffer(mesh, device, physicalDevice, commandPool, queue, useDeviceLocalBuffer)
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101 result[2] = uint32(mesh.indices.len * mesh.indices[0].len)
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102
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103 result[3] = getVkIndexType(mesh)