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The primary command is vertex A vertex command always speci es a 3D position, two generalized triangle strip replacement bits (rep), and a mesh buffer
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Version 11 Alpha 01, February 27, 1998
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B10
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Geometry Compression Commands
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push (mbp) bit, and may optionally specify a normal and/or a color (or texture map coordinate) The presence of normal or color data within a vertex command is controlled by two state bits known as the bundling bits: bnv and bcv, respectively
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normal, color
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There are also two stand-alone commands for specifying normals and colors: normal and color These commands may be freely interspersed with vertex commands, and semantically have (nearly) the same effect as normals or colors bundled directly with a normal Once a color or normal value is speci ed, either directly or bundled with a vertex command, that color or normal will remain in effect as the current color or normal until a new value is speci ed In this fashion, for example, a constant material color may be speci ed to apply to a forthcoming sequence of non-colorbundled vertices
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setState
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The setState command updates the value of the three state bits Two of these bits are the normal and color bundling bits; the other one will be described later
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meshBufferReference
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The meshBufferReference command allows any of the 16 vertices most recently pushed into the mesh buffer to be reused in place of a vertex command at this point Two vertex replacement bits are also present
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setTable
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The setTable command allows a range of entries in one of the three Huffman decompression tables all to be set to the same new value
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The passthrough command allows other data to be embedded in the compression stream
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The variable length no-operation NOP command allows the compression bit stream to be padded by a speci ed number of bits This allows portions of the compression data to be 32-bit aligned when desired
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setState B122
B11 Bit Layout of Geometry Decompression Commands
Figure B-4 shows the bit-level layout of the eight geometry decompression commands Each command has a unique opcode, and then some (possible variable) number of arguments The actual bit length of many of the components may vary, and if so, a unique (dynamic) Huffman tag at the very start of any variablelength argument delimits the size of the argument
B12 Geometry Decompression Command Bit Details
The following subsections describe the bit details of several of the geometry decompression commands, and much of their associated semantics
B121
0 0 0
0 0 0 0 1
Bit count 0-31 0 s
The variable length no-operation (NOP) command has an 8-bit opcode, a 5-bit count eld, and a 0- to 31-bit eld of zeros The total length of the variablelength no-operation command is between 13 and 44 bits The variable-length NOP command s primary use is to align geometry decompression commands to word boundaries, when desired This is useful if one wishes to patch a decompression instruction in the middle of a stream without having to bit-align the patch
B122
setState
b n v b c v c a p
0 0 0
The setState command has a 7-bit opcode, 3 bits of state to be set, and a spare, for a total length of 11 bits The rst and second state bits indicate if normals and/or colors will be bundled with vertex commands, respectively The third state bit indicates if colors will contain an alpha value, in addition to the standard RGB The nal state bit is unused, and reserved for future use
Version 11 Alpha 01, February 27, 1998
B122 setState
vertex
Position bits 0 5 rep m b p Position bits 6 n
3D GEOMETRY COMPRESSION
Normal bits
Color bits
normal
Normal bits 0 5 Normal bits 6 n
color
Color bits 0 5 Color bits 6 n
meshBufferReference
0 0 1
Index r e p r e p
setState
0 0 0 1 1 0 0
b n v b c v c a p
setTable
0 0 0 1 0
Table Range Entry
Reserved (unused)
0 0 0 0 1
0 0 0 0 0 0 0 1
Bit Count 0s
Position:
Normal:
^ ^ t t (or absolute index)
Color:
Figure B-4
Bit Layout of Geometry Compression Commands
Java 3D API Specification
3D GEOMETRY COMPRESSION
setTable B123
B123
0 0 0
setTable
Table Address/Range Data Length A/R Up-shift
The setTable command has a 5-bit op code, a 2-bit table eld, a 7-bit address/ range eld, a 4-bit data length eld, an absolute/relative bit, and a 4-bit up-shift eld The total instruction length is xed at 23 bits The table and address/range elds specify which decompression table entries to update; the remaining elds comprise the values to which to update the table entries The two-bit table speci es for which of the three decompression tables this update is targeted: