(module ;;------------------------------------------------------------------------------ ;; Import the difficult math functions from javascript ;; (seriously now, it's 2020) ;;------------------------------------------------------------------------------ (func $pow (import "m" "pow") (param f32) (param f32) (result f32)) (func $log2 (import "m" "log2") (param f32) (result f32)) (func $sin (import "m" "sin") (param f32) (result f32)) ;;------------------------------------------------------------------------------ ;; Types. Only useful to define the jump table type, which is ;; (int stereo) void ;;------------------------------------------------------------------------------ (type $opcode_func_signature (func (param i32))) ;;------------------------------------------------------------------------------ ;; The one and only memory ;;------------------------------------------------------------------------------ (memory (export "m") 831) ;;------------------------------------------------------------------------------ ;; Globals. Putting all with same initialization value should compress most ;;------------------------------------------------------------------------------ (global $WRK (mut i32) (i32.const 0)) (global $COM (mut i32) (i32.const 0)) (global $VAL (mut i32) (i32.const 0)) (global $globaltick (mut i32) (i32.const 0)) (global $row (mut i32) (i32.const 0)) (global $pattern (mut i32) (i32.const 0)) (global $sample (mut i32) (i32.const 0)) (global $voice (mut i32) (i32.const 0)) (global $voicesRemain (mut i32) (i32.const 0)) (global $randseed (mut i32) (i32.const 1)) (global $sp (mut i32) (i32.const 2688)) (global $outputBufPtr (mut i32) (i32.const 134016)) ;; TODO: only export start and length with certain compiler options; in demo use, they can be hard coded ;; in the intro (global $outputStart (export "s") i32 (i32.const 134016)) (global $outputLength (export "l") i32 (i32.const 54326272)) (global $output16bit (export "t") i32 (i32.const 0)) ;;------------------------------------------------------------------------------ ;; Functions to emulate FPU stack in software ;;------------------------------------------------------------------------------ (func $peek (result f32) (f32.load (global.get $sp)) ) (func $peek2 (result f32) (f32.load offset=4 (global.get $sp)) ) (func $pop (result f32) (call $peek) (global.set $sp (i32.add (global.get $sp) (i32.const 4))) ) (func $push (param $value f32) (global.set $sp (i32.sub (global.get $sp) (i32.const 4))) (f32.store (global.get $sp) (local.get $value)) ) ;;------------------------------------------------------------------------------ ;; Helper functions ;;------------------------------------------------------------------------------ (func $swap (param f32 f32) (result f32 f32) ;; x,y -> y,x local.get 1 local.get 0 ) (func $scanValueByte (result i32) ;; scans positions $VAL for a byte, incrementing $VAL afterwards (i32.load8_u (global.get $VAL)) ;; in other words: returns byte [$VAL++] (global.set $VAL (i32.add (global.get $VAL) (i32.const 1))) ;; $VAL++ ) ;;------------------------------------------------------------------------------ ;; "Entry point" for the player ;;------------------------------------------------------------------------------ (start $render) ;; we run render automagically when the module is instantiated (func $render (param) loop $pattern_loop (global.set $row (i32.const 0)) loop $row_loop (call $su_update_voices) (global.set $sample (i32.const 0)) loop $sample_loop (global.set $COM (i32.const 2210)) (global.set $VAL (i32.const 2243)) (global.set $WRK (i32.const 2880)) (global.set $voice (i32.const 2880)) (global.set $voicesRemain (i32.const 10)) (call $su_run_vm) (i64.store (global.get $outputBufPtr) (i64.load (i32.const 2848))) ;; load the sample from left & right channels as one 64bit int and store it in the address pointed by outputBufPtr (global.set $outputBufPtr (i32.add (global.get $outputBufPtr) (i32.const 8))) ;; advance outputbufptr (i64.store (i32.const 2848) (i64.const 0)) ;; clear the left and right ports (global.set $sample (i32.add (global.get $sample) (i32.const 1))) (global.set $globaltick (i32.add (global.get $globaltick) (i32.const 1))) (br_if $sample_loop (i32.lt_s (global.get $sample) (i32.const 5512))) end (global.set $row (i32.add (global.get $row) (i32.const 1))) (br_if $row_loop (i32.lt_s (global.get $row) (i32.const 16))) end (global.set $pattern (i32.add (global.get $pattern) (i32.const 1))) (br_if $pattern_loop (i32.lt_s (global.get $pattern) (i32.const 77))) end ) ;; the simple implementation of update_voices: each track has exactly one voice (func $su_update_voices (local $si i32) (local $di i32) (local $tracksRemaining i32) (local $note i32) (local.set $tracksRemaining (i32.const 10)) (local.set $si (global.get $pattern)) (local.set $di (i32.const 2880)) loop $track_loop (i32.load8_u offset=1440 (local.get $si)) (i32.mul (i32.const 16)) (i32.add (global.get $row)) (i32.load8_u offset=0) (local.tee $note) (if (i32.ne (i32.const 1))(then (i32.store offset=4 (local.get $di) (i32.const 1)) ;; release the note (if (i32.gt_u (local.get $note) (i32.const 1))(then (memory.fill (local.get $di) (i32.const 0) (i32.const 4096)) (i32.store (local.get $di) (local.get $note)) )) )) (local.set $di (i32.add (local.get $di) (i32.const 4096))) (local.set $si (i32.add (local.get $si) (i32.const 77))) (br_if $track_loop (local.tee $tracksRemaining (i32.sub (local.get $tracksRemaining) (i32.const 1)))) end ) ;;------------------------------------------------------------------------------- ;; 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 (if (i32.lt_u (local.get $paramNum) (i32.load8_u offset=2317 (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=2688 (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))) (br_if 2 (i32.eqz (global.get $voicesRemain))) ;; if no more voices remain, return from function )) br $vm_loop end ) ;;------------------------------------------------------------------------------- ;; ENVELOPE opcode: pushes an ADSR envelope value on stack [0,1] ;;------------------------------------------------------------------------------- ;; Mono: push the envelope value on stack ;; Stereo: push the envelope valeu on stack twice ;;------------------------------------------------------------------------------- (func $su_op_envelope (param $stereo i32) (local $state i32) (local $level f32) (local $delta f32) (if (i32.load offset=4 (global.get $voice)) (then ;; if voice.release > 0 (i32.store (global.get $WRK) (i32.const 3)) ;; set envelope state to release )) (local.set $state (i32.load (global.get $WRK))) (local.set $level (f32.load offset=4 (global.get $WRK))) (local.set $delta (call $nonLinearMap (local.get $state))) (if (local.get $state) (then (if (i32.eq (local.get $state) (i32.const 1))(then ;; state is 1 aka decay (local.set $level (f32.sub (local.get $level) (local.get $delta))) (if (f32.le (local.get $level) (call $input (i32.const 2)))(then (local.set $level (call $input (i32.const 2))) (local.set $state (i32.const 2)) )) )) (if (i32.eq (local.get $state) (i32.const 3))(then ;; state is 3 aka release (local.set $level (f32.sub (local.get $level) (local.get $delta))) (if (f32.le (local.get $level) (f32.const 0)) (then (local.set $level (f32.const 0)) )) )) )(else ;; the state is 0 aka attack (local.set $level (f32.add (local.get $level) (local.get $delta))) (if (f32.ge (local.get $level) (f32.const 1))(then (local.set $level (f32.const 1)) (local.set $state (i32.const 1)) )) )) (i32.store (global.get $WRK) (local.get $state)) (f32.store offset=4 (global.get $WRK) (local.get $level)) (call $push (f32.mul (local.get $level) (call $input (i32.const 4)))) ) ;;------------------------------------------------------------------------------- ;; OUT opcode: outputs and pops the signal ;;------------------------------------------------------------------------------- ;; Mono: add ST0 to main left port, then pop ;;------------------------------------------------------------------------------- (func $su_op_out (param $stereo i32) (local $ptr i32) (local.set $ptr (i32.const 2848)) ;; synth.left (f32.store (local.get $ptr) (f32.add (f32.mul (call $pop) (call $input (i32.const 0)) ) (f32.load (local.get $ptr)) ) ) (local.set $ptr (i32.const 2852)) ;; synth.right, note that ATM does not seem to support mono ocpode at all (f32.store (local.get $ptr) (f32.add (f32.mul (call $pop) (call $input (i32.const 0)) ) (f32.load (local.get $ptr)) ) ) ) ;;------------------------------------------------------------------------------- ;; $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=2688 (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 3 funcref) (elem (i32.const 1) ;; start the indices at 1, as 0 is reserved for advance $su_op_envelope $su_op_out ) ;; All data is collected into a byte buffer and emitted at once (data (i32.const 0) 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;;(data (i32.const 8388610) "\52\49\46\46\b2\eb\0c\20\57\41\56\45\66\6d\74\20\12\20\20\20\03\20\02\20\44\ac\20\20\20\62\05\20\08\20\20\20\20\20\66\61\63\74\04\20\20\20\e0\3a\03\20\64\61\74\61\80\eb\0c\20") ) ;; END MODULE