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Audio.pitch MSB must be 1 to use current synth

This commit is contained in:
Andrew Alderwick 2021-04-13 21:52:54 +01:00
parent 2ea85815f6
commit 43cde08b68
4 changed files with 11 additions and 8 deletions
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8
projects/examples/dev.audio.usm
View File

@ -120,7 +120,7 @@ BRK
@play ( pitch -- )
=Audio.pitch
#80 ORA =Audio.pitch
,triangle-wave =Audio.wave
~track.active =Audio.play
@ -190,7 +190,7 @@ BRK
DUP #ff NEQ ^$skip1 JNZ
POP ^$listen2 JMP
$skip1
#00 SWP ,notes ADD2 PEK2 =Audio.pitch
#00 SWP ,notes ADD2 PEK2 #80 ORA =Audio.pitch
~volume.ch1 =Audio.volume
,square-wave =Audio.wave
#00 =Audio.play
@ -200,7 +200,7 @@ BRK
DUP #ff NEQ ^$skip2 JNZ
POP ^$listen3 JMP
$skip2
#00 SWP ,notes ADD2 PEK2 =Audio.pitch
#00 SWP ,notes ADD2 PEK2 #80 ORA =Audio.pitch
~volume.ch2 =Audio.volume
,square-wave =Audio.wave
#01 =Audio.play
@ -210,7 +210,7 @@ BRK
DUP #ff NEQ ^$skip3 JNZ
POP ^$end JMP
$skip3
#00 SWP ,notes ADD2 PEK2 =Audio.pitch
#00 SWP ,notes ADD2 PEK2 #80 ORA =Audio.pitch
~volume.ch3 =Audio.volume
,triangle-wave =Audio.wave
#02 =Audio.play

4
src/apu.c
View File

@ -78,10 +78,12 @@ apu_render(Apu *apu, Uxn *u, Sint16 *samples, int n_samples)
}
void
apu_play_note(Note *note, Uint16 wave_vector, Uint16 envelope_vector, Uint8 volume, Uint8 pitch)
apu_play_note(Note *note, Uint16 wave_vector, Uint16 envelope_vector, Uint8 volume, Uint8 pitch, Uint8 impl)
{
int i;
if(pitch >= 108 || impl == 0) return;
note->playing = 1;
note->impl = impl;
for(i = 0; i < 2; ++i) {
note->volume[i] = 0xf & (volume >> 4 * (1 - i));
note->wv[i].count = note->wv[i].period = 0;

5
src/apu.h
View File

@ -29,7 +29,8 @@ typedef struct {
typedef struct {
WaveformGenerator wv[2];
Sint8 volume[2], playing;
Sint8 volume[2];
Uint8 playing, impl;
} Note;
typedef struct {
@ -40,4 +41,4 @@ typedef struct {
} Apu;
void apu_render(Apu *apu, Uxn *u, Sint16 *samples, int n_samples);
void apu_play_note(Note *note, Uint16 wave_vector, Uint16 envelope_vector, Uint8 volume, Uint8 pitch);
void apu_play_note(Note *note, Uint16 wave_vector, Uint16 envelope_vector, Uint8 volume, Uint8 pitch, Uint8 impl);

2
src/emulator.c
View File

@ -247,7 +247,7 @@ audio_poke(Uxn *u, Uint16 ptr, Uint8 b0, Uint8 b1)
if(b0 == 0xa) {
if(b1 >= apu.n_notes) apu.notes = SDL_realloc(apu.notes, (b1 + 1) * sizeof(Note));
while(b1 >= apu.n_notes) SDL_zero(apu.notes[apu.n_notes++]);
apu_play_note(&apu.notes[b1], (m[0x0] << 8) + m[0x1], (m[0x2] << 8) + m[0x3], m[0x8], m[0x9]);
apu_play_note(&apu.notes[b1], (m[0x0] << 8) + m[0x1], (m[0x2] << 8) + m[0x3], m[0x8], m[0x9] & 0x7f, m[0x9] > 0x7f);
} else if(b0 == 0xe && apu.queue != NULL) {
if(apu.queue->n == apu.queue->sz) {
apu.queue->sz = apu.queue->sz < 4 ? 4 : apu.queue->sz * 2;