actionscript 3 - what's the agal tex syntax? -

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here syntax i've read

tex t b - samples texture in b (which should 1 of fs registers) @ coordinates in a, putting resulting colour in t.

but in opensource project code found wrote tex this:

tex ft0.xyzw vi0.xyzw fs0 <flinear,mlinear,clamp,2d,rgba,b:45>//what's bias:45?

and this

tex ft3, v3, fs0<2d, linear, miplinear,dxt1>//what dxt1, there this?

which confusing me stuff can put in <> seems no order requirement

thanks hints

i can guess meanings of other flags - aren't in of documentation i've seen, , aren't in stock version of agalminiassembler. gut feeling they're used extended version of agalminiassembler created use specific flash package (like starling or away3d). i'd stick well-documented texture flags - see pdf linked @ end of post.

as order, correct - order not matter when passing tags tex function, assuming using basic version of agalminiassembler provided adobe.

the reason relatively simple: every tag used single 'tex' operation represented single 64-bit field when operation converted bytecode. order doesn't matter since different tags occupy different bits within field. still have trouble when 2 tags occupy same portion of field used @ same time - "nearest" , "linear" example, or "mipnearest" , "nomip" (note conflicting behavior between these instructions!).

check out this pdf if want see ops implemented in current, non-beta versions of flash, or if want further how bytecode assembled before being passed shaders.


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