mirror of
https://github.com/vsariola/sointu.git
synced 2025-05-28 03:10:24 -04:00
145 lines
7.0 KiB
Plaintext
145 lines
7.0 KiB
Plaintext
;;-------------------------------------------------------------------------------
|
|
;; su_run_vm function: runs the entire virtual machine once, creating 1 sample
|
|
;;-------------------------------------------------------------------------------
|
|
(func $su_run_vm (local $opcodeWithStereo i32) (local $opcode i32) (local $paramNum i32) (local $paramX4 i32) (local $WRKplusparam i32)
|
|
loop $vm_loop
|
|
(local.set $opcodeWithStereo (i32.load8_u (global.get $COM)))
|
|
(global.set $COM (i32.add (global.get $COM) (i32.const 1))) ;; move to next instruction
|
|
(global.set $WRK (i32.add (global.get $WRK) (i32.const 64))) ;; move WRK to next unit
|
|
(if (local.tee $opcode (i32.shr_u (local.get $opcodeWithStereo) (i32.const 1)))(then ;; if $opcode = $opcodeStereo >> 1; $opcode != 0 {
|
|
(local.set $paramNum (i32.const 0))
|
|
(local.set $paramX4 (i32.const 0))
|
|
loop $transform_values_loop
|
|
{{- $addr := sub (index .Labels "su_vm_transformcounts") 1}}
|
|
(if (i32.lt_u (local.get $paramNum) (i32.load8_u offset={{$addr}} (local.get $opcode)))(then ;;(i32.ge (local.get $paramNum) (i32.load8_u (local.get $opcode))) /*TODO: offset to transformvalues
|
|
(local.set $WRKplusparam (i32.add (global.get $WRK) (local.get $paramX4)))
|
|
(f32.store offset={{index .Labels "su_transformedvalues"}}
|
|
(local.get $paramX4)
|
|
(f32.add
|
|
(f32.mul
|
|
(f32.convert_i32_u (call $scanValueByte))
|
|
(f32.const 0.0078125) ;; scale from 0-128 to 0.0 - 1.0
|
|
)
|
|
(f32.load offset=32 (local.get $WRKplusparam)) ;; add modulation
|
|
)
|
|
)
|
|
(f32.store offset=32 (local.get $WRKplusparam) (f32.const 0.0)) ;; clear modulations
|
|
(local.set $paramNum (i32.add (local.get $paramNum) (i32.const 1))) ;; $paramNum++
|
|
(local.set $paramX4 (i32.add (local.get $paramX4) (i32.const 4)))
|
|
br $transform_values_loop ;; continue looping
|
|
))
|
|
;; paramNum was >= the number of parameters to transform, exiting loop
|
|
end
|
|
(call_indirect (type $opcode_func_signature) (i32.and (local.get $opcodeWithStereo) (i32.const 1)) (local.get $opcode))
|
|
)(else ;; advance to next voice
|
|
(global.set $voice (i32.add (global.get $voice) (i32.const 4096))) ;; advance to next voice
|
|
(global.set $WRK (global.get $voice)) ;; set WRK point to beginning of voice
|
|
(global.set $voicesRemain (i32.sub (global.get $voicesRemain) (i32.const 1)))
|
|
{{- if .SupportsPolyphony}}
|
|
(if (i32.and (i32.shr_u (i32.const {{.PolyphonyBitmask | printf "%v"}}) (global.get $voicesRemain)) (i32.const 1))(then
|
|
(global.set $VAL (global.get $VAL_instr_start))
|
|
(global.set $COM (global.get $COM_instr_start))
|
|
))
|
|
(global.set $VAL_instr_start (global.get $VAL))
|
|
(global.set $COM_instr_start (global.get $COM))
|
|
{{- end}}
|
|
(br_if 2 (i32.eqz (global.get $voicesRemain))) ;; if no more voices remain, return from function
|
|
))
|
|
br $vm_loop
|
|
end
|
|
)
|
|
|
|
{{- template "arithmetic.wat" .}}
|
|
{{- template "effects.wat" .}}
|
|
{{- template "sources.wat" .}}
|
|
{{- template "sinks.wat" .}}
|
|
|
|
;;-------------------------------------------------------------------------------
|
|
;; $input returns the float value of a transformed to 0.0 - 1.0f range.
|
|
;; The transformed values start at 512 (TODO: change magic constants somehow)
|
|
;;-------------------------------------------------------------------------------
|
|
(func $input (param $inputNumber i32) (result f32)
|
|
(f32.load offset={{index .Labels "su_transformedvalues"}} (i32.mul (local.get $inputNumber) (i32.const 4)))
|
|
)
|
|
|
|
;;-------------------------------------------------------------------------------
|
|
;; $inputSigned returns the float value of a transformed to -1.0 - 1.0f range.
|
|
;;-------------------------------------------------------------------------------
|
|
(func $inputSigned (param $inputNumber i32) (result f32)
|
|
(f32.sub (f32.mul (call $input (local.get $inputNumber)) (f32.const 2)) (f32.const 1))
|
|
)
|
|
|
|
;;-------------------------------------------------------------------------------
|
|
;; $nonLinearMap: x -> 2^(-24*input[x])
|
|
;;-------------------------------------------------------------------------------
|
|
(func $nonLinearMap (param $value i32) (result f32)
|
|
(call $pow2
|
|
(f32.mul
|
|
(f32.const -24)
|
|
(call $input (local.get $value))
|
|
)
|
|
)
|
|
)
|
|
|
|
;;-------------------------------------------------------------------------------
|
|
;; $pow2: x -> 2^x
|
|
;;-------------------------------------------------------------------------------
|
|
(func $pow2 (param $value f32) (result f32)
|
|
(call $pow (f32.const 2) (local.get $value))
|
|
)
|
|
|
|
;;-------------------------------------------------------------------------------
|
|
;; Waveshaper(x,a): "distorts" signal x by amount a
|
|
;; Returns x*a/(1-a+(2*a-1)*abs(x))
|
|
;;-------------------------------------------------------------------------------
|
|
(func $waveshaper (param $signal f32) (param $amount f32) (result f32)
|
|
(local.set $signal (call $clip (local.get $signal)))
|
|
(f32.mul
|
|
(local.get $signal)
|
|
(f32.div
|
|
(local.get $amount)
|
|
(f32.add
|
|
(f32.const 1)
|
|
(f32.sub
|
|
(f32.mul
|
|
(f32.sub
|
|
(f32.add (local.get $amount) (local.get $amount))
|
|
(f32.const 1)
|
|
)
|
|
(f32.abs (local.get $signal))
|
|
)
|
|
(local.get $amount)
|
|
)
|
|
)
|
|
)
|
|
)
|
|
)
|
|
|
|
;;-------------------------------------------------------------------------------
|
|
;; Clip(a : f32) returns min(max(a,-1),1)
|
|
;;-------------------------------------------------------------------------------
|
|
(func $clip (param $value f32) (result f32)
|
|
(f32.min (f32.max (local.get $value) (f32.const -1.0)) (f32.const 1.0))
|
|
)
|
|
|
|
(func $stereoHelper (param $stereo i32) (param $tableIndex i32)
|
|
(if (local.get $stereo)(then
|
|
(call $pop)
|
|
(global.set $WRK (i32.add (global.get $WRK) (i32.const 16)))
|
|
(call_indirect (type $opcode_func_signature) (i32.const 0) (local.get $tableIndex))
|
|
(global.set $WRK (i32.sub (global.get $WRK) (i32.const 16)))
|
|
(call $push)
|
|
))
|
|
)
|
|
|
|
;;-------------------------------------------------------------------------------
|
|
;; The opcode table jump table. This is constructed to only include the opcodes
|
|
;; that are used so that the jump table is as small as possible.
|
|
;;-------------------------------------------------------------------------------
|
|
(table {{.Instructions | len | add 1}} anyfunc)
|
|
(elem (i32.const 1) ;; start the indices at 1, as 0 is reserved for advance
|
|
{{- range .Instructions}}
|
|
$su_op_{{.}}
|
|
{{- end}}
|
|
)
|