SPIR-V assembler with lispy syntax.
(ll-assemble
'((spirv-core:capability :shader)
(spirv-core:ext-inst-import :glsl "GLSL.std.450")
(spirv-core:memory-model :logical :glsl-450)
(spirv-core:entry-point :fragment main main input1 input2 output1 ...)
(spirv-core:execution-mode main :origin-lower-left)
(spirv-core:source :glsl 450)
...
(spirv-core:type-void :void)
(spirv-core:type-function |void()| :void)
...
(spirv-core:function main :void :none |void()|)
...
(spirv-core:function-end)
))
;; -> (unsigned-byte 32) vector containing assembled output
Opcodes are in package spirv-core with Op removed and -
separator instead of capital letters, for example OpExtInstImport ->
spirv-core:ext-inst-import.
Result <id> is passed as first argument when applicable, followed by corresponding Result Type <id> if applicable, followed by any remaining arguments.
Currently "GLSL.std.450" is the only extension supported, symbols are in package spirv-glsl and renamed similarly.
Spirv <id>s are symbols, for example :glsl,main,input1, etc. above.
Enumerated constants are keywords, as in :shader,:logical,:glsl-450 above. (Note that :glsl is just a symbol being used to name an <id>, not an enumerant).
Bit mask constants are either a keyword or list of keywords, for example :none above, or something like (:inline :pure). (:none or ()/NIL can be used to represent no bits set).
Extension opcodes look like
(spirv-core:ext-inst <dest> <type> :glsl spirv-glsl450:sqrt <arg...>)which would call the opcode sqrt in the imported extension named by the <id> :glsl
Assembles the example from the spec correctly as far as I can tell. The code to assemble opcodes is generated automatically, so there are probably still some instructions it doesn't get right. (There are probably some more it gets wrong due to problems with the json spec).
Some attempt at validation/error checking is made, but is far from complete.