ACTIONSCRIPT 3 Developer’s Guide en

Chapter 67: Adobe Graphics Assembly
Language (AGAL)
The Adobe Graphics Assembly Language (AGAL) is a shader language for defining vertex and fragment rendering
programs. The AGAL programs must be uploaded to the rendering context in the binary bytecode format described
in this document.
AGAL bytecode format
AGAL bytecode must use Endian.LITTLE_ENDIAN format.
Bytecode Header
AGAL bytecode must begin with a 7-byte header:
A0000001A100 -- for a vertex program
A0000001A101 -- for a fragment program
Offset (bytes) Size (bytes) Name Description
0 1 magic must be 0xa0
1 4 version must be 1
5 1 shader type ID must be 0xa1
6 1 shader type 0 for a vertex program; 1 for a fragment program
Tokens
The header is immediately followed by any number of tokens. Every token is 192 bits (24 bytes) in size and always has
the format:
[opcode][destination][source1][source2 or sampler]
Not every opcode uses all of these fields. Unused fields must be set to 0.
Operation codes
The [opcode] field is 32 bits in size and can take one of these values:
Name Opcode Operation Description
mov 0x00 move move data from source1 to destination, component-wise
add 0x01 add destination = source1 + source2, component-wise
sub 0x02 subtract destination = source1 - source2, component-wise
mul 0x03 multiply destination = source1 * source2, component-wise
div 0x04 divide destination = source1 / source2, component-wise
rcp 0x05 reciprocal destination = 1/source1, component-wise
Last updated 6/6/2012
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