Change bridge.go so that there is just SetPatch(...) function, instead of having to SetCommands, SetValues etc.

Now the patch definition in bridge_test.go and test_envelope.asm appear quite similar, so it's clear how they are related.

bridge/bridge.go

@@ -1,19 +1,33 @@
 package bridge
 
-import "fmt"
-import "unsafe"
-import "math"
+import (
+	"errors"
+	"math"
+)
 
 // #cgo CFLAGS: -I"${SRCDIR}/../include"
 // #cgo LDFLAGS: "${SRCDIR}/../build/src/libsointu.a"
 // #include <sointu.h>
 import "C"
-import "errors"
 
-type SynthState = C.SynthState
+// SynthState contains the entire state of sointu sound engine
+type SynthState C.SynthState // hide C.Synthstate, explicit cast is still possible if needed
 
+// Opcode is a single byte, representing the virtual machine commands used in Sointu
 type Opcode byte
 
+// Unit includes command (filter, oscillator, envelope etc.) and its parameters
+type Unit struct {
+	Command Opcode
+	Params  []byte
+}
+
+// Instrument includes a list of units consisting of the instrument, and the number of polyphonic voices for this instrument
+type Instrument struct {
+	NumVoices int
+	Units     []Unit
+}
+
 var ( // cannot be const as the rhs are not known at compile-time
 	Add      = Opcode(C.su_add_id)
 	Addp     = Opcode(C.su_addp_id)
@@ -47,10 +61,12 @@ var ( // cannot be const as the rhs are not known at compile-time
 	In       = Opcode(C.su_in_id)
 )
 
+// Stereo returns the stereo version of any (mono or stereo) opcode
 func (o Opcode) Stereo() Opcode {
 	return Opcode(byte(o) | 1) // set lowest bit
 }
 
+// Mono returns the mono version of any (mono or stereo) opcode
 func (o Opcode) Mono() Opcode {
 	return Opcode(byte(o) & 0xFE) // clear lowest bit
 }
@@ -73,38 +89,64 @@ func (s *SynthState) Render(buffer []float32,maxRows int,callback func()) (int,
 	maxSamples := len(buffer) / 2
 	remaining := maxSamples
 	for i := 0; i < maxRows; i++ {
-    remaining = int(C.su_render_samples(s,C.int(remaining),(*C.float)(&buffer[2*(maxSamples-remaining)])))
-    if (remaining >= 0) { // values >= 0 mean that row end was reached
+		remaining = int(C.su_render_samples((*C.SynthState)(s), C.int(remaining), (*C.float)(&buffer[2*(maxSamples-remaining)])))
+		if remaining >= 0 { // values >= 0 mean that row end was reached
 			callback()
 		}
-    if (remaining <= 0) { // values <= 0 mean that buffer is full, ready to return
-      break;
+		if remaining <= 0 { // values <= 0 mean that buffer is full, ready to return
+			break
 		}
 	}
 	return maxSamples - remaining, nil
 }
 
-func (s *SynthState) SetCommands(c [2048]Opcode) {
-  pk := *((*[2048]C.uchar)(unsafe.Pointer(&c)))
-  s.Commands = pk
+func (s *SynthState) SetPatch(patch []Instrument) error {
+	totalVoices := 0
+	commands := make([]Opcode, 0)
+	values := make([]byte, 0)
+	for _, instr := range patch {
+		if len(instr.Units) > 63 {
+			return errors.New("An instrument can have a maximum of 63 units")
 		}
-
-func (s *SynthState) SetValues(c [16384]byte) {
-  pk := *((*[16384]C.uchar)(unsafe.Pointer(&c)))
-  s.Values = pk
+		if instr.NumVoices < 1 {
+			return errors.New("Each instrument must have at least 1 voice")
+		}
+		for _, unit := range instr.Units {
+			commands = append(commands, unit.Command)
+			values = append(values, unit.Params...)
+		}
+		commands = append(commands, Advance)
+		totalVoices += instr.NumVoices
+	}
+	if totalVoices > 32 {
+		return errors.New("Sointu does not support more than 32 concurrent voices")
+	}
+	if len(commands) > 2048 { // TODO: 2048 could probably be pulled automatically from cgo
+		return errors.New("The patch would result in more than 2048 commands")
+	}
+	if len(values) > 16384 { // TODO: 16384 could probably be pulled automatically from cgo
+		return errors.New("The patch would result in more than 16384 values")
+	}
+	cs := (*C.SynthState)(s)
+	for i := range commands {
+		cs.Commands[i] = (C.uchar)(commands[i])
+	}
+	for i := range values {
+		cs.Values[i] = (C.uchar)(values[i])
+	}
+	cs.NumVoices = C.uint(totalVoices)
+	return nil
 }
 
 func (s *SynthState) Trigger(voice int, note int) {
-  fmt.Printf("Calling Trigger...\n")
-  s.Synth.Voices[voice] = C.Voice{}
-  s.Synth.Voices[voice].Note = C.int(note)
-  fmt.Printf("Returning from Trigger...\n")
+	cs := (*C.SynthState)(s)
+	cs.Synth.Voices[voice] = C.Voice{}
+	cs.Synth.Voices[voice].Note = C.int(note)
 }
 
 func (s *SynthState) Release(voice int) {
-  fmt.Printf("Calling Release...\n")
-  s.Synth.Voices[voice].Release = 1
-  fmt.Printf("Returning from Release...\n")
+	cs := (*C.SynthState)(s)
+	cs.Synth.Voices[voice].Release = 1
 }
 
 func NewSynthState() *SynthState {

bridge/bridge_test.go

@@ -3,11 +3,12 @@ package bridge_test
 import (
 	"bytes"
 	"encoding/binary"
-	"github.com/vsariola/sointu/bridge"
 	"io/ioutil"
 	"path"
 	"runtime"
 	"testing"
+
+	"github.com/vsariola/sointu/bridge"
 )
 
 const BPM = 100
@@ -20,20 +21,19 @@ const su_max_samples = SAMPLES_PER_ROW * TOTAL_ROWS
 // const bufsize = su_max_samples * 2
 
 func TestBridge(t *testing.T) {
-	commands := [2048]bridge.Opcode{
-		bridge.Envelope, bridge.Envelope, bridge.Out.Stereo(), bridge.Advance}
-	values := [16384]byte{64, 64, 64, 80, 128, // envelope 1
-		95, 64, 64, 80, 128, // envelope 2
-		128}
 	s := bridge.NewSynthState()
-	s.SetCommands(commands)
-	s.SetValues(values)
-	s.NumVoices = 1
-	s.Synth.Voices[0].Note = 64
-	s.SamplesPerRow = SAMPLES_PER_ROW * 8 // this song is two blocks of 8 rows, release during second
+	s.SetPatch([]bridge.Instrument{
+		bridge.Instrument{1, []bridge.Unit{
+			bridge.Unit{bridge.Envelope, []byte{64, 64, 64, 80, 128}},
+			bridge.Unit{bridge.Envelope, []byte{95, 64, 64, 80, 128}},
+			bridge.Unit{bridge.Out.Stereo(), []byte{128}},
+		}},
+	})
+	s.Trigger(0, 64)
+	s.SamplesPerRow = SAMPLES_PER_ROW * 8 // this song is two blocks of 8 rows, release before second block start
 	buffer := make([]float32, 2*su_max_samples)
 	n, err := s.Render(buffer, 2, func() {
-	   s.Synth.Voices[0].Release = 1
+		s.Release(0)
 	})
 	if n < su_max_samples {
 		t.Fatalf("could not fill the whole buffer, %v samples rendered, %v expected", n, su_max_samples)