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https://git.mirrors.martin98.com/https://github.com/google/draco
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292 lines
8.3 KiB
Markdown
292 lines
8.3 KiB
Markdown
## Descriptions
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### Constants
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* Mesh encoding methods
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* 0: MESH_SEQUENTIAL_ENCODING
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* 1: MESH_EDGEBREAKER_ENCODING
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* Metadata constants
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* 32768: METADATA_FLAG_MASK
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* Sequential attribute encoding methods
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* 0: SEQUENTIAL_ATTRIBUTE_ENCODER_GENERIC
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* 1: SEQUENTIAL_ATTRIBUTE_ENCODER_INTEGER
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* 2: SEQUENTIAL_ATTRIBUTE_ENCODER_QUANTIZATION
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* 3: SEQUENTIAL_ATTRIBUTE_ENCODER_NORMALS
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* Sequential indices encoding methods
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* 0: SEQUENTIAL_COMPRESSED_INDICES
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* 1: SEQUENTIAL_UNCOMPRESSED_INDICES
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* Prediction encoding methods
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* -2: PREDICTION_NONE
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* 0: PREDICTION_DIFFERENCE
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* 1: MESH_PREDICTION_PARALLELOGRAM
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* 4: MESH_PREDICTION_CONSTRAINED_MULTI_PARALLELOGRAM
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* 5: MESH_PREDICTION_TEX_COORDS_PORTABLE
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* 6: MESH_PREDICTION_GEOMETRIC_NORMAL
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* Prediction scheme transform methods
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* 1: PREDICTION_TRANSFORM_WRAP
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* 3: PREDICTION_TRANSFORM_NORMAL_OCTAHEDRON_CANONICALIZED
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* Mesh traversal methods
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* 0: MESH_TRAVERSAL_DEPTH_FIRST
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* 1: MESH_TRAVERSAL_PREDICTION_DEGREE
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* Mesh attribute encoding methods
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* 0: MESH_VERTEX_ATTRIBUTE
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* 1: MESH_CORNER_ATTRIBUTE
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* EdgeBreaker encoding methods
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* 0: STANDARD_EDGEBREAKER
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* 2: VALENCE_EDGEBREAKER
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* EdgeBreaker constants
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* -1: kInvalidCornerIndex
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* 0: LEFT_FACE_EDGE
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* 1: RIGHT_FACE_EDGE
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* 2: kTexCoordsNumComponents
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* 4: kMaxNumParallelograms
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* 3: kMaxPriority
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* EdgeBreaker bit pattern constants
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* 0: TOPOLOGY_C
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* 1: TOPOLOGY_S
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* 3: TOPOLOGY_L
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* 5: TOPOLOGY_R
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* 7: TOPOLOGY_E
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* Valence EdgeBreaker constants
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* 2: MIN_VALENCE
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* 7: MAX_VALENCE
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* 6: NUM_UNIQUE_VALENCES
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* ANS constants
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* 256: rabs_ans_p8_precision
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* 1024: rabs_ans_p10_precision
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* 4096: rabs_l_base
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* 256: IO_BASE
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* 4096: L_RANS_BASE
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* 16384: TAGGED_RANS_BASE
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* Symbol encoding methods
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* 0: TAGGED_SYMBOLS
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* 1: RAW_SYMBOLS
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### Variables
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#### Header
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* draco_string
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* Must equal "DRACO"
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* major_version
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* bitstream major version number
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* minor_version
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* bitstream minor version number
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* encoder_type
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* 0: POINT_CLOUD
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* 1: TRIANGULAR_MESH
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* encoder_method
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* 0: MESH_SEQUENTIAL_ENCODING
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* 1: MESH_EDGEBREAKER_ENCODING
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* flags
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#### Metadata
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* num_att_metadata
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* Attribute metadata count
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* att_metadata_id
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* Array of attribute metadata ids
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* att_metadata
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* Array of attribute metadata
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* file_metadata
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* Global metadata
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#### Sequential Encoding
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* num_points
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* Number of encoded points
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* connectivity_method
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#### EdgeBreaker Encoding
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* edgebreaker_traversal_type
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* 0: MeshEdgeBreakerTraversalDecoder
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* 1: MeshEdgeBreakerTraversalPredictiveDecoder
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* 2: MeshEdgeBreakerTraversalValenceDecoder
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* num_new_vertices
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* Number of new vertices
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* num_encoded_vertices
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* Number of encoded vertices
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* num_faces
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* Number of encoded faces
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* num_attribute_data
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* Number of encoded attributes
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* num_encoded_symbols
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* Number of encoded EdgeBreaker symbols
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* num_encoded_split_symbols
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* Number of encoded EdgeBreaker split symbols
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* encoded_connectivity_size
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* Size of encoded connectivity data in bytes
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* num_topology_splits
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* source_id_delta
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* Array of delta encoded source symbol ids
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* split_id_delta
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* Array of delta encoded split symbol ids
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* source_edge_bit
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* Array of source edge types
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* 0: LEFT_FACE_EDGE
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* 1: RIGHT_FACE_EDGE
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* source_symbol_id
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* Array of source symbol ids
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* split_symbol_id
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* Array of split symbol ids
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* last_symbol_
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* Last EdgeBreaker symbol decoded
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* last_vert_added
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* Id of the last vertex decoded
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* active_corner_stack
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* Array of current working corners used during EdgeBreaker decoding
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* edge_breaker_symbol_to_topology_id
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* Array of EdgeBreaker symbols
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* 0: TOPOLOGY_C
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* 1: TOPOLOGY_S
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* 2: TOPOLOGY_L
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* 3: TOPOLOGY_R
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* 4: TOPOLOGY_E
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* topology_split_id
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* List of decoder split ids encountered during a topology split.
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* split_active_corners
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* List of corners encountered during a topology split.
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#### EdgeBreaker Traversal
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* eb_symbol_buffer_size
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* eb_symbol_buffer
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* Standard EdgeBreaker encoded symbol data
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* eb_start_face_buffer_prob_zero
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* Face configuration encoded probability
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* eb_start_face_buffer_size
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* eb_start_face_buffer
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* EdgeBreaker encoded face configuration data
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* attribute_connectivity_decoders_prob_zero
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* Array of encoded attribute probabilities
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* attribute_connectivity_decoders_size
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* Array of attribute connectivity size
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* attribute_connectivity_decoders_buffer
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* Array of attribute connectivity data
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#### EdgeBreaker Valence Traversal
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* ebv_context_counters
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* Array of number of context symbols
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* ebv_context_symbols
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* Array of encoded context symbol data
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* active_context_
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* Index to the current valence
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* vertex_valences_
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* Array of current vertices valences
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#### Attribute Encoding
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* num_attributes_decoders
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* att_dec_data_id
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* Array of attribute decoder ids
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* att_dec_decoder_type
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* Array of attribute decoder types
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* 0: MESH_VERTEX_ATTRIBUTE
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* 1: MESH_CORNER_ATTRIBUTE
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* att_dec_traversal_method
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* Array of attribute traversal methods
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* 0: MESH_TRAVERSAL_DEPTH_FIRST
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* 1: MESH_TRAVERSAL_PREDICTION_DEGREE
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* att_dec_num_values_to_decode
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* Number of values to decode per attribute
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* att_dec_num_attributes
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* Array of number of attributes encoded per attribute type
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* att_dec_att_type
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* att_dec_data_type
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* Attribute's data type
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* att_dec_num_components
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* Attribute's component count
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* att_dec_normalized
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* att_dec_unique_id
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* Attribute's unique encoded id
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* seq_att_dec_decoder_type
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* Array of attribute encoding type
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* 0: SEQUENTIAL_ATTRIBUTE_ENCODER_GENERIC
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* 1: SEQUENTIAL_ATTRIBUTE_ENCODER_INTEGER
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* 2: SEQUENTIAL_ATTRIBUTE_ENCODER_QUANTIZATION
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* 3: SEQUENTIAL_ATTRIBUTE_ENCODER_NORMALS
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* seq_att_dec_prediction_scheme
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* Array of attribute prediction scheme method
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* -2: PREDICTION_NONE
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* 0: PREDICTION_DIFFERENCE
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* 1: MESH_PREDICTION_PARALLELOGRAM
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* 4: MESH_PREDICTION_CONSTRAINED_MULTI_PARALLELOGRAM
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* 5: MESH_PREDICTION_TEX_COORDS_PORTABLE
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* 6: MESH_PREDICTION_GEOMETRIC_NORMAL
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* seq_att_dec_prediction_transform_type
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* Array of attribute prediction transform method
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* 1: PREDICTION_TRANSFORM_WRAP
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* 3: PREDICTION_TRANSFORM_NORMAL_OCTAHEDRON_CANONICALIZED
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* seq_int_att_dec_compressed
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* pred_cons_multi_is_cease_edge
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* Array for multi parallelogram prediction signifying if the edge is the last edge
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* pred_tex_coords_orientaitons
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* Array signifying orientation for the texture coordinate prediction
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* pred_trasnform_wrap_min
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* Array of minimum clamp values used by the wrap transform
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* pred_trasnform_wrap_max
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* Array of maximum clamp values used by the wrap transform
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* pred_trasnform_normal_max_q_val
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* Maximum quantization array used by the normal transform
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* pred_transform_normal_flip_normal_bits
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* Array of flags used by the normal transform
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* seq_int_att_dec_decoded_values
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* Array of attribute decoded symbols
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* seq_int_att_dec_symbols_to_signed_ints
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* Array of decoded symbols converted to signed ints
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* seq_int_att_dec_original_values
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* Array containing the attribute's original quantized values
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* seq_int_att_dec_dequantized_values
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* Array containing the attribute's original values
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* quantized_data_min_values
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* Array of minimum quantization values
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* quantized_data_max_value_df
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* Array of quantization range
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* quantized_data_quantization_bits
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* Array of number of quantization bits
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#### Attribute Traversal
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* curr_att_dec
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* Current attribute decoder type
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* curr_att
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* Current attribute within a decoder type
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* vertex_visited_point_ids
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* Array of the last vertex visited per attribute
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* att_connectivity_seam_opp
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* att_connectivity_seam_src
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* att_connectivity_seam_dest
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* corner_to_point_map
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* is_edge_on_seam_
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* Array of bools signifying if the corner's opposite edge is on a seam
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* encoded_attribute_value_index_to_corner_map
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* Array for storing the corner ids in the order their associated attribute entries were encoded
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* vertex_to_encoded_attribute_value_index_map
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* Array for storing encoding order of attribute entries for each vertex
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* indices_map_
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* prediction_rans_prob_zero
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* Current rans zero probability
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* prediction_rans_data_size
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* Current size of rans encoded data
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* tex_coords_num_orientations
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* Current number of orientations for encoded Texture data
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* traversal_stacks_
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* Array of available corners
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* best_priority_
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* Current best available priority
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* prediction_degree_
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* Array of current degree prediction for each vertex
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* constrained_multi_num_flags
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