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annotate semiconginev2/gltf.nim @ 1243:7e55fde39ca8

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did: prepare for gltf importer and cleanup old engine code
author sam <sam@basx.dev>
date Mon, 22 Jul 2024 17:49:48 +0700
parents
children d594b1d07d49
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1243
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
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diff changeset
1 type
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
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2 glTFHeader = object
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3 magic: uint32
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4 version: uint32
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5 length: uint32
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6 glTFData = object
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7 structuredContent: JsonNode
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8 binaryBufferData: seq[uint8]
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9
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10 const
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11 JSON_CHUNK = 0x4E4F534A
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12 BINARY_CHUNK = 0x004E4942
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13 ACCESSOR_TYPE_MAP = {
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14 5120: Int8,
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15 5121: UInt8,
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16 5122: Int16,
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17 5123: UInt16,
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18 5125: UInt32,
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19 5126: Float32,
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20 }.toTable
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21 SAMPLER_FILTER_MODE_MAP = {
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22 9728: VK_FILTER_NEAREST,
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23 9729: VK_FILTER_LINEAR,
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24 9984: VK_FILTER_NEAREST,
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25 9985: VK_FILTER_LINEAR,
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26 9986: VK_FILTER_NEAREST,
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27 9987: VK_FILTER_LINEAR,
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
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28 }.toTable
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29 SAMPLER_WRAP_MODE_MAP = {
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30 33071: VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE,
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31 33648: VK_SAMPLER_ADDRESS_MODE_MIRRORED_REPEAT,
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32 10497: VK_SAMPLER_ADDRESS_MODE_REPEAT
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
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33 }.toTable
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34 GLTF_MATERIAL_MAPPING = {
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35 "color": "baseColorFactor",
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36 "emissiveColor": "emissiveFactor",
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37 "metallic": "metallicFactor",
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38 "roughness", "roughnessFactor",
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39 "baseTexture": "baseColorTexture",
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40 "metallicRoughnessTexture": "metallicRoughnessTexture",
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41 "normalTexture": "normalTexture",
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42 "occlusionTexture": "occlusionTexture",
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43 "emissiveTexture": "emissiveTexture",
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44 }.toTable
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45
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46 proc getGPUType(accessor: JsonNode, attribute: string): DataType =
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47 # TODO: no full support for all datatypes that glTF may provide
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48 # semicongine/core/gpu_data should maybe generated with macros to allow for all combinations
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49 let componentType = ACCESSOR_TYPE_MAP[accessor["componentType"].getInt()]
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50 let theType = accessor["type"].getStr()
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51 case theType
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52 of "SCALAR":
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53 return componentType
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54 of "VEC2":
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55 case componentType
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56 of UInt32: return Vec2U32
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57 of Float32: return Vec2F32
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58 else: raise newException(Exception, &"Unsupported data type for attribute '{attribute}': {componentType} {theType}")
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59 of "VEC3":
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60 case componentType
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61 of UInt32: return Vec3U32
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62 of Float32: return Vec3F32
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63 else: raise newException(Exception, &"Unsupported data type for attribute '{attribute}': {componentType} {theType}")
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64 of "VEC4":
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65 case componentType
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66 of UInt32: return Vec4U32
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67 of Float32: return Vec4F32
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68 else: raise newException(Exception, &"Unsupported data type for attribute '{attribute}': {componentType} {theType}")
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69 of "MAT2":
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70 case componentType
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71 of Float32: return Vec4F32
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72 else: raise newException(Exception, &"Unsupported data type for attribute '{attribute}': {componentType} {theType}")
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73 of "MAT3":
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74 case componentType
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75 of Float32: return Vec4F32
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76 else: raise newException(Exception, &"Unsupported data type for attribute '{attribute}': {componentType} {theType}")
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77 of "MAT4":
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78 case componentType
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79 of Float32: return Vec4F32
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80 else: raise newException(Exception, &"Unsupported data type for attribute '{attribute}': {componentType} {theType}")
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81
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82 proc getBufferViewData(bufferView: JsonNode, mainBuffer: seq[uint8], baseBufferOffset = 0): seq[uint8] =
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83 assert bufferView["buffer"].getInt() == 0, "Currently no external buffers supported"
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84
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85 result = newSeq[uint8](bufferView["byteLength"].getInt())
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86 let bufferOffset = bufferView["byteOffset"].getInt() + baseBufferOffset
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87 var dstPointer = addr result[0]
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88
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89 if bufferView.hasKey("byteStride"):
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90 raise newException(Exception, "Unsupported feature: byteStride in buffer view")
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91 copyMem(dstPointer, addr mainBuffer[bufferOffset], result.len)
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92
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93 proc getAccessorData(root: JsonNode, accessor: JsonNode, mainBuffer: seq[uint8]): DataList =
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94 result = InitDataList(thetype = accessor.getGPUType("??"))
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95 result.SetLen(accessor["count"].getInt())
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96
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97 let bufferView = root["bufferViews"][accessor["bufferView"].getInt()]
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98 assert bufferView["buffer"].getInt() == 0, "Currently no external buffers supported"
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99
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100 if accessor.hasKey("sparse"):
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101 raise newException(Exception, "Sparce accessors are currently not implemented")
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102
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103 let accessorOffset = if accessor.hasKey("byteOffset"): accessor["byteOffset"].getInt() else: 0
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104 let length = bufferView["byteLength"].getInt()
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105 let bufferOffset = bufferView["byteOffset"].getInt() + accessorOffset
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106 var dstPointer = result.GetPointer()
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107
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108 if bufferView.hasKey("byteStride"):
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109 warn "Congratulations, you try to test a feature (loading buffer data with stride attributes) that we have no idea where it is used and how it can be tested (need a coresponding *.glb file)."
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110 # we don't support stride, have to convert stuff here... does this even work?
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111 for i in 0 ..< int(result.len):
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112 copyMem(dstPointer, addr mainBuffer[bufferOffset + i * bufferView["byteStride"].getInt()], int(result.thetype.Size))
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113 dstPointer = cast[pointer](cast[uint](dstPointer) + result.thetype.Size)
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114 else:
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115 copyMem(dstPointer, addr mainBuffer[bufferOffset], length)
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116
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117 proc loadImage(root: JsonNode, imageIndex: int, mainBuffer: seq[uint8]): Image[RGBAPixel] =
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118 if root["images"][imageIndex].hasKey("uri"):
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119 raise newException(Exception, "Unsupported feature: Load images from external files")
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120
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121 let bufferView = root["bufferViews"][root["images"][imageIndex]["bufferView"].getInt()]
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122 let imgData = newStringStream(cast[string](getBufferViewData(bufferView, mainBuffer)))
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123
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124 let imageType = root["images"][imageIndex]["mimeType"].getStr()
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125 case imageType
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126 of "image/bmp":
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127 result = ReadBMP(imgData)
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128 of "image/png":
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129 result = ReadPNG(imgData)
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130 else:
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131 raise newException(Exception, "Unsupported feature: Load image of type " & imageType)
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132
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133 proc loadTexture(root: JsonNode, textureIndex: int, mainBuffer: seq[uint8]): Texture =
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134 let textureNode = root["textures"][textureIndex]
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135 result = Texture(isGrayscale: false)
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136 result.colorImage = loadImage(root, textureNode["source"].getInt(), mainBuffer)
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137 result.name = root["images"][textureNode["source"].getInt()]["name"].getStr()
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138 if result.name == "":
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139 result.name = &"Texture{textureIndex}"
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140
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
141 if textureNode.hasKey("sampler"):
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
142 let sampler = root["samplers"][textureNode["sampler"].getInt()]
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
143 if sampler.hasKey("magFilter"):
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
144 result.sampler.magnification = SAMPLER_FILTER_MODE_MAP[sampler["magFilter"].getInt()]
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
145 if sampler.hasKey("minFilter"):
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
146 result.sampler.minification = SAMPLER_FILTER_MODE_MAP[sampler["minFilter"].getInt()]
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
147 if sampler.hasKey("wrapS"):
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
148 result.sampler.wrapModeS = SAMPLER_WRAP_MODE_MAP[sampler["wrapS"].getInt()]
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
149 if sampler.hasKey("wrapT"):
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
150 result.sampler.wrapModeT = SAMPLER_WRAP_MODE_MAP[sampler["wrapS"].getInt()]
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
151
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
152
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
153 proc loadMaterial(root: JsonNode, materialNode: JsonNode, defaultMaterial: MaterialType, mainBuffer: seq[uint8]): MaterialData =
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
154 let pbr = materialNode["pbrMetallicRoughness"]
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
155 var attributes: Table[string, DataList]
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
156
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
157 # color
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
158 if defaultMaterial.attributes.contains("color"):
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
159 attributes["color"] = InitDataList(thetype = Vec4F32)
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
160 if pbr.hasKey(GLTF_MATERIAL_MAPPING["color"]):
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
161 attributes["color"] = @[NewVec4f(
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
162 pbr[GLTF_MATERIAL_MAPPING["color"]][0].getFloat(),
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
163 pbr[GLTF_MATERIAL_MAPPING["color"]][1].getFloat(),
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
164 pbr[GLTF_MATERIAL_MAPPING["color"]][2].getFloat(),
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
165 pbr[GLTF_MATERIAL_MAPPING["color"]][3].getFloat(),
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
166 )]
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
167 else:
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
168 attributes["color"] = @[NewVec4f(1, 1, 1, 1)]
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
169
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
170 # pbr material values
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
171 for factor in ["metallic", "roughness"]:
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
172 if defaultMaterial.attributes.contains(factor):
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
173 attributes[factor] = InitDataList(thetype = Float32)
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
174 if pbr.hasKey(GLTF_MATERIAL_MAPPING[factor]):
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
175 attributes[factor] = @[float32(pbr[GLTF_MATERIAL_MAPPING[factor]].getFloat())]
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
176 else:
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
177 attributes[factor] = @[0.5'f32]
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sam <sam@basx.dev>
parents:
diff changeset
178
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
179 # pbr material textures
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
180 for texture in ["baseTexture", "metallicRoughnessTexture"]:
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
181 if defaultMaterial.attributes.contains(texture):
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
182 attributes[texture] = InitDataList(thetype = TextureType)
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
183 # attributes[texture & "Index"] = InitDataList(thetype=UInt8)
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
184 if pbr.hasKey(GLTF_MATERIAL_MAPPING[texture]):
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
185 attributes[texture] = @[loadTexture(root, pbr[GLTF_MATERIAL_MAPPING[texture]]["index"].getInt(), mainBuffer)]
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
186 else:
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
187 attributes[texture] = @[EMPTY_TEXTURE]
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
188
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
189 # generic material textures
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
190 for texture in ["normalTexture", "occlusionTexture", "emissiveTexture"]:
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
191 if defaultMaterial.attributes.contains(texture):
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
192 attributes[texture] = InitDataList(thetype = TextureType)
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
193 # attributes[texture & "Index"] = InitDataList(thetype=UInt8)
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
194 if materialNode.hasKey(GLTF_MATERIAL_MAPPING[texture]):
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
195 attributes[texture] = @[loadTexture(root, materialNode[texture]["index"].getInt(), mainBuffer)]
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
196 else:
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
197 attributes[texture] = @[EMPTY_TEXTURE]
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
198
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
199 # emissiv color
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
200 if defaultMaterial.attributes.contains("emissiveColor"):
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
201 attributes["emissiveColor"] = InitDataList(thetype = Vec3F32)
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
202 if materialNode.hasKey(GLTF_MATERIAL_MAPPING["emissiveColor"]):
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
203 attributes["emissiveColor"] = @[NewVec3f(
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
204 materialNode[GLTF_MATERIAL_MAPPING["emissiveColor"]][0].getFloat(),
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
205 materialNode[GLTF_MATERIAL_MAPPING["emissiveColor"]][1].getFloat(),
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
206 materialNode[GLTF_MATERIAL_MAPPING["emissiveColor"]][2].getFloat(),
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
207 )]
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
208 else:
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
209 attributes["emissiveColor"] = @[NewVec3f(1'f32, 1'f32, 1'f32)]
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
210
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
211 result = InitMaterialData(theType = defaultMaterial, name = materialNode["name"].getStr(), attributes = attributes)
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
212
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
213 proc loadMesh(meshname: string, root: JsonNode, primitiveNode: JsonNode, materials: seq[MaterialData], mainBuffer: seq[uint8]): Mesh =
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
214 if primitiveNode.hasKey("mode") and primitiveNode["mode"].getInt() != 4:
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
215 raise newException(Exception, "Currently only TRIANGLE mode is supported for geometry mode")
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
216
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
217 var indexType = None
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
218 let indexed = primitiveNode.hasKey("indices")
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
219 if indexed:
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
220 # TODO: Tiny indices
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
221 var indexCount = root["accessors"][primitiveNode["indices"].getInt()]["count"].getInt()
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
222 if indexCount < int(high(uint16)):
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
223 indexType = Small
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
224 else:
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
225 indexType = Big
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
226
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
227 result = Mesh(
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
228 instanceTransforms: @[Unit4F32],
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
229 indexType: indexType,
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
230 name: meshname,
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
231 vertexCount: 0,
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
232 )
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
233
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
234 for attribute, accessor in primitiveNode["attributes"].pairs:
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
235 let data = root.getAccessorData(root["accessors"][accessor.getInt()], mainBuffer)
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
236 if result.vertexCount == 0:
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
237 result.vertexCount = data.len
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
238 assert data.len == result.vertexCount
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
239 result[].InitVertexAttribute(attribute.toLowerAscii, data)
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
240
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
241 if primitiveNode.hasKey("material"):
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
242 let materialId = primitiveNode["material"].getInt()
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
243 result[].material = materials[materialId]
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
244 else:
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
245 result[].material = EMPTY_MATERIAL.InitMaterialData()
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
246
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
247 if primitiveNode.hasKey("indices"):
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
248 assert result[].indexType != None
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
249 let data = root.getAccessorData(root["accessors"][primitiveNode["indices"].getInt()], mainBuffer)
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
250 var tri: seq[int]
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
251 case data.thetype
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
252 of UInt16:
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
253 for entry in data[uint16][]:
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
254 tri.add int(entry)
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
255 if tri.len == 3:
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
256 # FYI gltf uses counter-clockwise indexing
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
257 result[].AppendIndicesData(tri[0], tri[1], tri[2])
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
258 tri.setLen(0)
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
259 of UInt32:
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
260 for entry in data[uint32][]:
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
261 tri.add int(entry)
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
262 if tri.len == 3:
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
263 # FYI gltf uses counter-clockwise indexing
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
264 result[].AppendIndicesData(tri[0], tri[1], tri[2])
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
265 tri.setLen(0)
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
266 else:
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
267 raise newException(Exception, &"Unsupported index data type: {data.thetype}")
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
268 # TODO: getting from gltf to vulkan system is still messed up somehow, see other TODO
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
269 Transform[Vec3f](result[], "position", Scale(1, -1, 1))
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
270
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
271 proc loadNode(root: JsonNode, node: JsonNode, materials: seq[MaterialData], mainBuffer: var seq[uint8]): MeshTree =
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
272 result = MeshTree()
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
273 # mesh
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
274 if node.hasKey("mesh"):
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
275 let mesh = root["meshes"][node["mesh"].getInt()]
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
276 for primitive in mesh["primitives"]:
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
277 result.children.add MeshTree(mesh: loadMesh(mesh["name"].getStr(), root, primitive, materials, mainBuffer))
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
278
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
279 # transformation
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
diff changeset
280 if node.hasKey("matrix"):
7e55fde39ca8 did: prepare for gltf importer and cleanup old engine code
sam <sam@basx.dev>
parents:
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281 var mat: Mat4
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282 for i in 0 ..< node["matrix"].len:
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283 mat[i] = node["matrix"][i].getFloat()
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284 result.transform = mat
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285 else:
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286 var (t, r, s) = (Unit4F32, Unit4F32, Unit4F32)
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287 if node.hasKey("translation"):
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288 t = Translate(
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289 float32(node["translation"][0].getFloat()),
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290 float32(node["translation"][1].getFloat()),
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291 float32(node["translation"][2].getFloat())
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292 )
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293 if node.hasKey("rotation"):
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294 t = Rotate(
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295 float32(node["rotation"][3].getFloat()),
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296 NewVec3f(
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297 float32(node["rotation"][0].getFloat()),
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298 float32(node["rotation"][1].getFloat()),
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299 float32(node["rotation"][2].getFloat())
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300 )
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301 )
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302 if node.hasKey("scale"):
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303 t = Scale(
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304 float32(node["scale"][0].getFloat()),
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305 float32(node["scale"][1].getFloat()),
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306 float32(node["scale"][2].getFloat())
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307 )
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308 result.transform = t * r * s
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309 result.transform = Scale(1, -1, 1) * result.transform
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310
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311 # children
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312 if node.hasKey("children"):
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313 for childNode in node["children"]:
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314 result.children.add loadNode(root, root["nodes"][childNode.getInt()], materials, mainBuffer)
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315
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316 proc loadMeshTree(root: JsonNode, scenenode: JsonNode, materials: seq[MaterialData], mainBuffer: var seq[uint8]): MeshTree =
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317 result = MeshTree()
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318 for nodeId in scenenode["nodes"]:
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319 result.children.add loadNode(root, root["nodes"][nodeId.getInt()], materials, mainBuffer)
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320 # TODO: getting from gltf to vulkan system is still messed up somehow (i.e. not consistent for different files), see other TODO
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321 # result.transform = Scale(1, -1, 1)
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322 result.updateTransforms()
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323
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324
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325 proc ReadglTF*(stream: Stream, defaultMaterial: MaterialType): seq[MeshTree] =
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326 var
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327 header: glTFHeader
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328 data: glTFData
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329
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330 for name, value in fieldPairs(header):
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331 stream.read(value)
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332
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333 assert header.magic == 0x46546C67
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334 assert header.version == 2
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335
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336 var chunkLength = stream.readUint32()
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337 assert stream.readUint32() == JSON_CHUNK
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338 data.structuredContent = parseJson(stream.readStr(int(chunkLength)))
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339
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340 chunkLength = stream.readUint32()
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341 assert stream.readUint32() == BINARY_CHUNK
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342 data.binaryBufferData.setLen(chunkLength)
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343 assert stream.readData(addr data.binaryBufferData[0], int(chunkLength)) == int(chunkLength)
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344
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345 # check that the refered buffer is the same as the binary chunk
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346 # external binary buffers are not supported
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347 assert data.structuredContent["buffers"].len == 1
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348 assert not data.structuredContent["buffers"][0].hasKey("uri")
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349 let bufferLenDiff = int(chunkLength) - data.structuredContent["buffers"][0]["byteLength"].getInt()
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350 assert 0 <= bufferLenDiff and bufferLenDiff <= 3 # binary buffer may be aligned to 4 bytes
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351
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352 debug "Loading mesh: ", data.structuredContent.pretty
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353
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354 var materials: seq[MaterialData]
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355 for materialnode in data.structuredContent["materials"]:
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356 materials.add data.structuredContent.loadMaterial(materialnode, defaultMaterial, data.binaryBufferData)
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357
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358 for scenedata in data.structuredContent["scenes"]:
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359 result.add data.structuredContent.loadMeshTree(scenedata, materials, data.binaryBufferData)