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# SPDX-License-Identifier: Apache-2.0
# Copyright 2018-2021 The glTF-Blender-IO authors.
from enum import IntEnum
class ComponentType(IntEnum):
Byte = 5120
UnsignedByte = 5121
Short = 5122
UnsignedShort = 5123
UnsignedInt = 5125
Float = 5126
@classmethod
def to_type_code(cls, component_type):
return {
ComponentType.Byte: 'b',
ComponentType.UnsignedByte: 'B',
ComponentType.Short: 'h',
ComponentType.UnsignedShort: 'H',
ComponentType.UnsignedInt: 'I',
ComponentType.Float: 'f'
}[component_type]
@classmethod
def to_numpy_dtype(cls, component_type):
import numpy as np
return {
ComponentType.Byte: np.int8,
ComponentType.UnsignedByte: np.uint8,
ComponentType.Short: np.int16,
ComponentType.UnsignedShort: np.uint16,
ComponentType.UnsignedInt: np.uint32,
ComponentType.Float: np.float32,
}[component_type]
@classmethod
def from_legacy_define(cls, type_define):
return {
GLTF_COMPONENT_TYPE_BYTE: ComponentType.Byte,
GLTF_COMPONENT_TYPE_UNSIGNED_BYTE: ComponentType.UnsignedByte,
GLTF_COMPONENT_TYPE_SHORT: ComponentType.Short,
GLTF_COMPONENT_TYPE_UNSIGNED_SHORT: ComponentType.UnsignedShort,
GLTF_COMPONENT_TYPE_UNSIGNED_INT: ComponentType.UnsignedInt,
GLTF_COMPONENT_TYPE_FLOAT: ComponentType.Float
}[type_define]
@classmethod
def get_size(cls, component_type):
return {
ComponentType.Byte: 1,
ComponentType.UnsignedByte: 1,
ComponentType.Short: 2,
ComponentType.UnsignedShort: 2,
ComponentType.UnsignedInt: 4,
ComponentType.Float: 4
}[component_type]
class DataType:
Scalar = "SCALAR"
Vec2 = "VEC2"
Vec3 = "VEC3"
Vec4 = "VEC4"
Mat2 = "MAT2"
Mat3 = "MAT3"
Mat4 = "MAT4"
def __new__(cls, *args, **kwargs):
raise RuntimeError("{} should not be instantiated".format(cls.__name__))
@classmethod
def num_elements(cls, data_type):
return {
DataType.Scalar: 1,
DataType.Vec2: 2,
DataType.Vec3: 3,
DataType.Vec4: 4,
DataType.Mat2: 4,
DataType.Mat3: 9,
DataType.Mat4: 16
}[data_type]
@classmethod
def vec_type_from_num(cls, num_elems):
if not (0 < num_elems < 5):
raise ValueError("No vector type with {} elements".format(num_elems))
return {
1: DataType.Scalar,
2: DataType.Vec2,
3: DataType.Vec3,
4: DataType.Vec4
}[num_elems]
@classmethod
def mat_type_from_num(cls, num_elems):
if not (4 <= num_elems <= 16):
raise ValueError("No matrix type with {} elements".format(num_elems))
return {
4: DataType.Mat2,
9: DataType.Mat3,
16: DataType.Mat4
}[num_elems]
class TextureFilter(IntEnum):
Nearest = 9728
Linear = 9729
NearestMipmapNearest = 9984
LinearMipmapNearest = 9985
NearestMipmapLinear = 9986
LinearMipmapLinear = 9987
class TextureWrap(IntEnum):
ClampToEdge = 33071
MirroredRepeat = 33648
Repeat = 10497
class BufferViewTarget(IntEnum):
ARRAY_BUFFER = 34962
ELEMENT_ARRAY_BUFFER = 34963
#################
# LEGACY DEFINES
GLTF_VERSION = "2.0"
#
# Component Types
#
GLTF_COMPONENT_TYPE_BYTE = "BYTE"
GLTF_COMPONENT_TYPE_UNSIGNED_BYTE = "UNSIGNED_BYTE"
GLTF_COMPONENT_TYPE_SHORT = "SHORT"
GLTF_COMPONENT_TYPE_UNSIGNED_SHORT = "UNSIGNED_SHORT"
GLTF_COMPONENT_TYPE_UNSIGNED_INT = "UNSIGNED_INT"
GLTF_COMPONENT_TYPE_FLOAT = "FLOAT"
#
# Data types
#
GLTF_DATA_TYPE_SCALAR = "SCALAR"
GLTF_DATA_TYPE_VEC2 = "VEC2"
GLTF_DATA_TYPE_VEC3 = "VEC3"
GLTF_DATA_TYPE_VEC4 = "VEC4"
GLTF_DATA_TYPE_MAT2 = "MAT2"
GLTF_DATA_TYPE_MAT3 = "MAT3"
GLTF_DATA_TYPE_MAT4 = "MAT4"
GLTF_IOR = 1.5
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