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Returned SDL calls from apu.c to emulator.c

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This commit is contained in:
Andrew Alderwick 2021-04-08 21:14:40 +01:00
parent 530ff4bef2
commit 59f5fbf4f1
3 changed files with 124 additions and 102 deletions
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117
src/apu.c
View file

@ -1,5 +1,3 @@
#include <SDL2/SDL.h>
/*
Copyright (c) 2021 Devine Lu Linvega
Copyright (c) 2021 Andrew Alderwick
@ -13,11 +11,9 @@ WITH REGARD TO THIS SOFTWARE.
*/
#include "uxn.h"
#include "apu.h"
#define SAMPLE_FREQUENCY 48000
extern SDL_AudioDeviceID audio_id;
int error(char *msg, const char *err);
extern Device *devapu;
static Uint32 note_advances[12] = {
0x82d01286 / (SAMPLE_FREQUENCY / 30), /* C7 */
@ -34,55 +30,33 @@ static Uint32 note_advances[12] = {
0xf6f11003 / (SAMPLE_FREQUENCY / 30) /* B7 */
};
typedef struct {
Uint16 *dat;
Uint8 i, n, sz, ends;
} Queue;
typedef struct {
Uint32 count, advance, period;
Uint16 vector;
Sint16 start_value, end_value;
Queue queue;
} WaveformGenerator;
typedef struct {
WaveformGenerator wv[2];
Sint8 volume[2], playing;
} Note;
static Note *notes = NULL;
static int n_notes = 0;
static Queue *q;
static Uint16 id_addr;
static void
play_note(Uxn *u, int note_i, Sint16 *samples, int n_samples)
render_note(Apu *apu, Uxn *u, int note_i, Sint16 *samples, int n_samples)
{
int i;
Note *note = &notes[note_i];
Note *note = &apu->notes[note_i];
while(n_samples--) {
Sint32 sample = 1;
for(i = 0; i < 2; ++i) {
WaveformGenerator *wv = &note->wv[i];
q = &wv->queue;
apu->queue = &wv->queue;
wv->count += wv->advance;
while(wv->count > wv->period) {
wv->count -= wv->period;
wv->start_value = wv->end_value;
if(q->i == q->n) {
q->i = q->n = 0;
if(!q->ends) {
u->ram.dat[id_addr] = note_i;
if(apu->queue->i == apu->queue->n) {
apu->queue->i = apu->queue->n = 0;
if(!apu->queue->finishes) {
u->ram.dat[devapu->addr + 0xa] = note_i;
evaluxn(u, wv->vector);
}
}
if(!q->n) {
if(!apu->queue->n) {
note->playing = 0;
return;
}
wv->end_value = (Sint16)q->dat[q->i++];
wv->period = (30 << 4) * q->dat[q->i++];
wv->end_value = (Sint16)apu->queue->dat[apu->queue->i++];
wv->period = (30 << 4) * apu->queue->dat[apu->queue->i++];
}
if(wv->period >> 9)
sample *= wv->start_value + (Sint32)(wv->end_value - wv->start_value) * (Sint32)(wv->count >> 10) / (Sint32)(wv->period >> 10);
@ -94,70 +68,31 @@ play_note(Uxn *u, int note_i, Sint16 *samples, int n_samples)
}
}
static void
play_all_notes(void *u, Uint8 *stream, int len)
void
apu_render(Apu *apu, Uxn *u, Sint16 *samples, int n_samples)
{
int i;
SDL_memset(stream, 0, len);
for(i = 0; i < n_notes; ++i)
if(notes[i].playing) play_note(u, i, (Sint16 *)stream, len >> 2);
q = NULL;
for(i = 0; i < n_samples * 2; ++i)
samples[i] = 0;
for(i = 0; i < apu->n_notes; ++i)
if(apu->notes[i].playing) render_note(apu, u, i, samples, n_samples);
apu->queue = NULL;
}
static Note *
get_note(Uint8 i)
void
apu_play_note(Note *note, Uint16 wave_vector, Uint16 envelope_vector, Uint8 volume, Uint8 pitch)
{
if(i >= n_notes) notes = SDL_realloc(notes, (i + 1) * sizeof(Note));
while(i >= n_notes) SDL_zero(notes[n_notes++]);
return &notes[i];
}
static Uint8
audio_poke(Uxn *u, Uint16 ptr, Uint8 b0, Uint8 b1)
{
Uint8 *m = u->ram.dat + ptr;
int i;
if(b0 == 0xa) {
Note *note = get_note(b1);
note->playing = 1;
for(i = 0; i < 2; ++i) {
note->volume[i] = 0xf & (m[0x8] >> 4 * (1 - i));
note->wv[i].vector = (m[0x0 + i * 2] << 8) + m[0x1 + i * 2];
note->volume[i] = 0xf & (volume >> 4 * (1 - i));
note->wv[i].count = note->wv[i].period = 0;
note->wv[i].end_value = 0;
note->wv[i].queue.n = note->wv[i].queue.i = 0;
note->wv[i].queue.ends = 0;
note->wv[i].queue.finishes = 0;
}
note->wv[0].advance = note_advances[m[0x9] % 12] >> (8 - m[0x9] / 12);
note->wv[0].vector = wave_vector;
note->wv[0].advance = note_advances[pitch % 12] >> (8 - pitch / 12);
note->wv[1].vector = envelope_vector;
note->wv[1].advance = (30 << 20) / SAMPLE_FREQUENCY;
} else if(b0 == 0xe && q != NULL) {
if(q->n == q->sz) {
q->sz = q->sz < 4 ? 4 : q->sz * 2;
q->dat = SDL_realloc(q->dat, q->sz * sizeof(*q->dat));
}
q->dat[q->n++] = (m[0xb] << 8) + m[0xc];
q->dat[q->n++] = (m[0xd] << 8) + b1;
} else if(b0 == 0xf && q != NULL) {
q->ends = 1;
}
return b1;
}
int
initapu(Uxn *u, Uint8 id)
{
SDL_AudioSpec as;
SDL_zero(as);
as.freq = SAMPLE_FREQUENCY;
as.format = AUDIO_S16;
as.channels = 2;
as.callback = play_all_notes;
as.samples = 2048;
as.userdata = u;
audio_id = SDL_OpenAudioDevice(NULL, 0, &as, NULL, 0);
if(!audio_id)
return error("Audio", SDL_GetError());
id_addr = portuxn(u, id, "audio", audio_poke)->addr + 0xa;
SDL_PauseAudioDevice(audio_id, 0);
return 1;
}

46
src/apu.h Normal file
View file

@ -0,0 +1,46 @@
/*
Copyright (c) 2021 Devine Lu Linvega
Copyright (c) 2021 Andrew Alderwick
Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE.
*/
typedef unsigned char Uint8;
typedef signed char Sint8;
typedef unsigned short Uint16;
typedef signed short Sint16;
typedef unsigned int Uint32;
typedef signed int Sint32;
#define SAMPLE_FREQUENCY 48000
typedef struct {
Uint16 *dat;
Uint8 i, n, sz, finishes;
} Queue;
typedef struct {
Uint32 count, advance, period;
Uint16 vector;
Sint16 start_value, end_value;
Queue queue;
} WaveformGenerator;
typedef struct {
WaveformGenerator wv[2];
Sint8 volume[2], playing;
} Note;
typedef struct {
Queue *queue;
Note *notes;
int n_notes;
} 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);

51
src/emulator.c
View file

@ -15,15 +15,18 @@ WITH REGARD TO THIS SOFTWARE.
#include "uxn.h"
#include "ppu.h"
#include "apu.h"
int initapu(Uxn *u, Uint8 id);
SDL_AudioDeviceID audio_id;
static SDL_AudioDeviceID audio_id;
static SDL_Window *gWindow;
static SDL_Renderer *gRenderer;
static SDL_Texture *gTexture;
static Ppu ppu;
static Apu apu;
static Device *devsystem, *devscreen, *devmouse, *devkey, *devctrl;
Device *devapu;
#pragma mark - Helpers
@ -41,6 +44,12 @@ error(char *msg, const char *err)
return 0;
}
static void
audio_callback(void *u, Uint8 *stream, int len)
{
apu_render(&apu, (Uxn *)u, (Sint16 *)stream, len >> 2);
}
void
redraw(Uint32 *dst, Uxn *u)
{
@ -86,8 +95,9 @@ quit(void)
}
int
init(void)
init(Uxn *u)
{
SDL_AudioSpec as;
if(!initppu(&ppu, 48, 32, 16))
return error("PPU", "Init failure");
if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) < 0)
@ -103,6 +113,17 @@ init(void)
return error("Texture", SDL_GetError());
SDL_StartTextInput();
SDL_ShowCursor(SDL_DISABLE);
SDL_zero(as);
as.freq = SAMPLE_FREQUENCY;
as.format = AUDIO_S16;
as.channels = 2;
as.callback = audio_callback;
as.samples = 2048;
as.userdata = u;
audio_id = SDL_OpenAudioDevice(NULL, 0, &as, NULL, 0);
if(!audio_id)
return error("Audio", SDL_GetError());
SDL_PauseAudioDevice(audio_id, 0);
return 1;
}
@ -258,6 +279,27 @@ file_poke(Uxn *u, Uint16 ptr, Uint8 b0, Uint8 b1)
return b1;
}
static Uint8
audio_poke(Uxn *u, Uint16 ptr, Uint8 b0, Uint8 b1)
{
Uint8 *m = u->ram.dat + ptr;
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]);
} 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;
apu.queue->dat = SDL_realloc(apu.queue->dat, apu.queue->sz * sizeof(*apu.queue->dat));
}
apu.queue->dat[apu.queue->n++] = (m[0xb] << 8) + m[0xc];
apu.queue->dat[apu.queue->n++] = (m[0xd] << 8) + b1;
} else if(b0 == 0xf && apu.queue != NULL) {
apu.queue->finishes = 1;
}
return b1;
}
Uint8
midi_poke(Uxn *u, Uint16 ptr, Uint8 b0, Uint8 b1)
{
@ -367,7 +409,7 @@ main(int argc, char **argv)
return error("Boot", "Failed");
if(!loaduxn(&u, argv[1]))
return error("Load", "Failed");
if(!init())
if(!init(&u))
return error("Init", "Failed");
devsystem = portuxn(&u, 0x00, "system", system_poke);
@ -378,8 +420,7 @@ main(int argc, char **argv)
devkey = portuxn(&u, 0x05, "key", ppnil);
devmouse = portuxn(&u, 0x06, "mouse", ppnil);
portuxn(&u, 0x07, "file", file_poke);
if(!initapu(&u, 0x08))
return 1;
devapu = portuxn(&u, 0x08, "audio", audio_poke);
portuxn(&u, 0x09, "midi", ppnil);
portuxn(&u, 0x0a, "datetime", datetime_poke);
portuxn(&u, 0x0b, "---", ppnil);