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base: piwalker:89a1b4cec60c70f9091a847cbedcb6be966863ab
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piwalker:master
piwalker:AudioReimplementation
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compare: piwalker:020feb2a6f4c5c7d49d4a440eb73b39de9562f88
Branches Tags
piwalker:master
piwalker:AudioReimplementation

No commits in common. "89a1b4cec60c70f9091a847cbedcb6be966863ab" and "020feb2a6f4c5c7d49d4a440eb73b39de9562f88" have entirely different histories.
89a1b4cec6 ... 020feb2a6f

6 changed files with 319 additions and 294 deletions
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20
include/audio.h
View File

@ -115,31 +115,13 @@ typedef struct {
u32 left_index;
float right_history[384];
u32 right_index;
u64 buffer_write_index;
float *left_audio_buffer;
float *right_audio_buffer;
u32 lfsr_timer;
float left_cap;
float right_cap;
int history_timer;
double cycles_needed;
u32 period_tick;
u32 ticks;
u32 right_index;
} audio_context;
void audio_init();
void audio_tick();
void audio_period_tick();
void lfsr_tick();
void audio_sample_tick();
u8 audio_read(u16 address);
void audio_write(u16 address, u8 value);

1
include/common.h
View File

@ -10,7 +10,6 @@ typedef uint16_t u16;
typedef uint32_t u32;
typedef uint64_t u64;
#define FAST_FORWARD_SPEED 2
#define BIT(a, n) ((a & (1 << n)) ? 1 : 0)
#define BIT_SET(a, n, on) {if(on) a |= (1 << n); else a &= ~(1 << n);}
#define BETWEEN(a, b, c) ((a >= b) && (a <= c))

1
include/emu.h
View File

@ -8,7 +8,6 @@ typedef struct {
bool die;
u64 ticks;
const char *app_path;
bool fast_forward;
} emu_context;
int emu_run(int, char**);

577
lib/audio.c
View File

@ -5,13 +5,32 @@
#include <portaudio.h>
#include <pa_ringbuffer.h>
#include <math.h>
#include <string.h>
#define SAMPLE_RATE 192000.0
#define SAMPLE_RATE 44100
#define FRAMES_PER_BUFFER 64
#define SAMPLES_PER_AUDIO_TICK SAMPLE_RATE / 4194304.0
#define HISTORY_INTERVAL 5
#define TIME_PER_SAMPLE 1.0f / (SAMPLE_RATE/1000.0f/1000.0f)
#define TIME_PER_AUDIO_TICK 1.0f / (1048576.0f/1000.0f/1000.0f)
#define TIME_PER_WAVE_TICK 1.0f / (2097152.0f/1000.0f/1000.0f)
#define LFSR_BASE_CLOCK 262144.0f
static audio_context ctx;
audio_context *audio_get_context() {
return &ctx;
}
static float audio_time = 0;
static float wave_time = 0;
static float lfsr_timer = 0;
static float lfsr_clock = LFSR_BASE_CLOCK;
static float lfsr_clock_buffer = LFSR_BASE_CLOCK;
static float left_cap = 0.0f;
static float right_cap = 0.0f;
static int history_timer = 0;
const int history_interval = 5;
static int lfsr_clocks = 0;
const u8 square_sample_00[8] = {
0x0,
@ -64,23 +83,248 @@ const u8 *square_sample[4] = {
square_sample_11
};
static audio_context ctx;
static int audio_callback(const void* input_uffer, void *output_buffer,
unsigned long framesPerBuffer,
const PaStreamCallbackTimeInfo *time_info,
PaStreamCallbackFlags status_flags,
void *userData ) {
float *out = (float *)output_buffer;
for(int i = 0; i < framesPerBuffer; i++) {
if(ppu_get_context()->paused) {
*out++ = 0;
*out++ = 0;
continue;
}
float left = 0;
float right = 0;
audio_time += TIME_PER_SAMPLE;
wave_time += TIME_PER_SAMPLE;
for(;audio_time >= TIME_PER_AUDIO_TICK;audio_time -= TIME_PER_AUDIO_TICK) {
ctx.sq1_period_timer++;
ctx.sq2_period_timer++;
if(ctx.sq1_period_timer >= 0x800) {
ctx.sq1_period_timer = ctx.sq1_period_reset;
ctx.sq1_sample = (ctx.sq1_sample + 1) % 8;
}
if(ctx.sq2_period_timer >= 0x800) {
ctx.sq2_period_timer = ctx.sq2_period_reset;
ctx.sq2_sample = (ctx.sq2_sample + 1) % 8;
}
}
for(;wave_time >= TIME_PER_WAVE_TICK;wave_time -= TIME_PER_WAVE_TICK) {
ctx.ch3_period_timer++;
if(ctx.ch3_period_timer >= 0x800) {
ctx.ch3_period_timer = ctx.ch3_period_reset;
ctx.ch3_sample = (ctx.ch3_sample + 1) % 32;
if((ctx.ch3_sample & 0b1) == 0b1) {
ctx.ch3_last_sample = ctx.wave_ram[ctx.ch3_sample >> 1] & 0xF;
} else {
ctx.ch3_last_sample = ctx.wave_ram[ctx.ch3_sample >> 1] >> 4;
}
}
}
lfsr_timer += TIME_PER_SAMPLE;
for(;lfsr_timer >= lfsr_clock;lfsr_timer -= lfsr_clock) {
//if(ctx.ch4_enable) {
lfsr_clocks++;
lfsr_clock = lfsr_clock_buffer;
//lfsr_timer = 0;
//u16 new = ~((ctx.ch4_lfsr & 0b1) ^ ((ctx.ch4_lfsr & 0b10) >> 1)) & 0b1;
//ctx.ch4_lfsr &= ~(1 << 15);
//ctx.ch4_lfsr |= ((new << 15) & 0x8000);
//printf("new bit: %02X\n", (new << 15));
//if(ctx.ch4_lfsr_width) {
// ctx.ch4_lfsr &= ~(1 << 7);
// ctx.ch4_lfsr |= (new << 7);
//}
//ctx.ch4_lfsr = ctx.ch4_lfsr >> 1;
//printf("lfsr: %02X, bit: %d\n", ctx.ch4_lfsr, new);
unsigned bit_mask = ctx.ch4_lfsr_width ? 0x4040 : 0x4000;
bool new_bit = (ctx.ch4_lfsr ^ (ctx.ch4_lfsr >> 1) ^ 1) & 1;
ctx.ch4_lfsr >>= 1;
if(new_bit) {
ctx.ch4_lfsr |= bit_mask;
} else {
ctx.ch4_lfsr &= ~bit_mask;
}
//}
}
float sq1_val = 0;
float sq2_val = 0;
float ch3_val = 0;
float ch4_val = 0;
if(ctx.audio_enabled){
if(ctx.ch1_dac){
sq1_val = -1;
if(ctx.sq1_enable) {
sq1_val = ((float)ctx.sq1_volume/15.0f) * (((float)(square_sample[ctx.sq1_duty][ctx.sq1_sample]) - 7.5f)/7.5f);
if(ctx.ch1_left) {
left += sq1_val;
}else {
left -= 1;
}
if(ctx.ch1_right) {
right += sq1_val;
}else {
right -= 1;
}
} else {
left -= 1;
right -= 1;
}
}
if(ctx.ch2_dac){
sq2_val = -1;
if(ctx.sq2_enable) {
sq2_val = ((float)ctx.sq2_volume/15.0f) * (((float)(square_sample[ctx.sq2_duty][ctx.sq2_sample]) - 7.5f)/7.5f);
if(ctx.ch2_left) {
left += sq2_val;
}else {
left -= 1;
}
if(ctx.ch2_right) {
right += sq2_val;
}else {
right -= 1;
}
} else {
left -= 1;
right -= 1;
}
}
if(ctx.ch3_dac){
ch3_val = -1;
if(ctx.ch3_enable) {
u8 shift = 0;
if(ctx.ch3_volume == 0b10) {
shift = 1;
}
if(ctx.ch3_volume == 0b00) {
shift = 4;
}
if(ctx.ch3_volume == 0b11) {
shift = 2;
}
ch3_val = (((float)(ctx.ch3_last_sample >> shift) - 7.5f)/7.5f);
if(ctx.ch3_left) {
left += ch3_val;
//printf("left: %d\n", ctx.ch3_volume);
}else {
left -= 1;
}
if(ctx.ch3_right) {
right += ch3_val;
}else {
right -= 1;
}
} else {
left -= 1;
right -= 1;
}
}
if(ctx.ch4_dac){
ch4_val = -1;
if(ctx.ch4_enable) {
ch4_val = ((ctx.ch4_lfsr & 0b1) == 0b1) ? (((float)ctx.ch4_volume - 7.5f)/7.5f) : -1.0f;
if(ctx.ch4_left) {
left += ch4_val;
//printf("left: %d\n", ctx.ch3_volume);
}else {
left -= 1;
}
if(ctx.ch4_right) {
right += ch4_val;
} else {
right -= 1;
}
} else {
left -= 1;
right -= 1;
}
}
}
u8 left_vol = ctx.volume_left == 0 ? 1 : ctx.volume_left;
u8 right_vol = ctx.volume_right == 0 ? 1 : ctx.volume_right;
left *= (float)left_vol/7.0f;
right *= (float)right_vol/7.0f;
//left /= 4;
//right /= 4;
bool dacs = ctx.ch1_dac || ctx.ch2_dac || ctx.ch3_dac || ctx.ch4_dac;
float left_out = 0;
float right_out = 0;
if(dacs) {
left_out = left - left_cap;
right_out = right - right_cap;
left_cap = left - left_out * 0.996f;
right_cap = right - right_out * 0.996f;
}
left_out /= 4;
right_out /= 4;
if(left_out < -1.0f) {
left_out = -1;
}
if(left_out > 1.0f) {
left_out = 1;
}
if(right_out < -1.0f) {
right_out = -1;
}
if(right_out > 1.0f) {
right_out = 1;
}
history_timer++;
if(history_timer >= history_interval){
history_timer = 0;
ctx.sq1_history[ctx.sq1_index++] = sq1_val;
if (ctx.sq1_index == 384) {
ctx.sq1_index = 0;
}
ctx.sq2_history[ctx.sq2_index++] = sq2_val;
if (ctx.sq2_index == 384) {
ctx.sq2_index = 0;
}
ctx.ch3_history[ctx.ch3_index++] = ch3_val;
if (ctx.ch3_index == 384) {
ctx.ch3_index = 0;
}
ctx.ch4_history[ctx.ch4_index++] = ch4_val;
if (ctx.ch4_index == 384) {
ctx.ch4_index = 0;
}
ctx.left_history[ctx.left_index++] = left_out;
if (ctx.left_index == 384) {
ctx.left_index = 0;
}
ctx.right_history[ctx.right_index++] = right_out;
if (ctx.right_index == 384) {
ctx.right_index = 0;
}
}
*out++ = left_out;
*out++ = right_out;
}
return paContinue;
}
static PaStream *stream;
audio_context *audio_get_context() {
return &ctx;
}
void audio_sample();
void audio_init(){
PaStreamParameters output_parameters;
PaError err;
ctx.left_audio_buffer = malloc(sizeof(float) * FRAMES_PER_BUFFER);
ctx.right_audio_buffer = malloc(sizeof(float) * FRAMES_PER_BUFFER);
memset(ctx.left_audio_buffer, 0, sizeof(float) * FRAMES_PER_BUFFER);
memset(ctx.right_audio_buffer, 0, sizeof(float) * FRAMES_PER_BUFFER);
ctx.audio_enabled = false;
ctx.ch1_left = false;
ctx.ch1_right = false;
@ -133,7 +377,7 @@ void audio_init(){
goto error;
}
output_parameters.channelCount = 2;
output_parameters.sampleFormat = paFloat32 | paNonInterleaved;
output_parameters.sampleFormat = paFloat32;
output_parameters.suggestedLatency = Pa_GetDeviceInfo(output_parameters.device)->defaultLowOutputLatency;
output_parameters.hostApiSpecificStreamInfo = NULL;
@ -141,9 +385,9 @@ void audio_init(){
NULL,
&output_parameters,
SAMPLE_RATE,
FRAMES_PER_BUFFER,
paFramesPerBufferUnspecified,
paNoFlag,
NULL,
audio_callback,
&ctx);
if(err != paNoError) goto error;
err = Pa_StartStream(stream);
@ -163,241 +407,16 @@ void sq1_sweep() {
if(ctx.sq1_calc_period > 0x7FF) {
ctx.sq1_enable = false;
}
}
}
void lfsr_tick() {
ctx.lfsr_timer--;
if(ctx.lfsr_timer == 0) {
ctx.lfsr_timer = (ctx.ch4_clock_divider > 0 ? (ctx.ch4_clock_divider << 4) : 8) << ctx.ch4_clock_shift;
unsigned bit_mask = ctx.ch4_lfsr_width ? 0x4040 : 0x4000;
bool new_bit = (ctx.ch4_lfsr ^ (ctx.ch4_lfsr >> 1) ^ 1) & 1;
ctx.ch4_lfsr >>= 1;
if(new_bit) {
ctx.ch4_lfsr |= bit_mask;
} else {
ctx.ch4_lfsr &= ~bit_mask;
}
}
}
static int change = 1;
static u32 ticks = 0;
static u32 start, end = 0;
void audio_sample_tick() {
lfsr_tick();
float left = 0;
float right = 0;
float sq1_val = 0;
float sq2_val = 0;
float ch3_val = 0;
float ch4_val = 0;
if(ctx.audio_enabled){
if(ctx.ch1_dac){
sq1_val = -1;
if(ctx.sq1_enable && (ctx.ch1_left || ctx.ch1_right)) {
sq1_val = ((float)ctx.sq1_volume/15.0f) * (((float)(square_sample[ctx.sq1_duty][ctx.sq1_sample]) - 7.5f)/7.5f);
if(ctx.ch1_left) {
left += sq1_val;
}else {
left -= 1;
}
if(ctx.ch1_right) {
right += sq1_val;
}else {
right -= 1;
}
} else {
left -= 1;
right -= 1;
}
}
if(ctx.ch2_dac){
sq2_val = -1;
if(ctx.sq2_enable && (ctx.ch2_left || ctx.ch2_right)) {
sq2_val = ((float)ctx.sq2_volume/15.0f) * (((float)(square_sample[ctx.sq2_duty][ctx.sq2_sample]) - 7.5f)/7.5f);
if(ctx.ch2_left) {
left += sq2_val;
}else {
left -= 1;
}
if(ctx.ch2_right) {
right += sq2_val;
}else {
right -= 1;
}
} else {
left -= 1;
right -= 1;
}
}
if(ctx.ch3_dac){
u8 shift = 0;
if(ctx.ch3_volume == 0b10) {
shift = 1;
}
if(ctx.ch3_volume == 0b00) {
shift = 4;
}
if(ctx.ch3_volume == 0b11) {
shift = 2;
}
ch3_val = -1;
if(ctx.ch3_enable && (ctx.ch3_left || ctx.ch3_right)) {
ch3_val = (((float)(ctx.ch3_last_sample >> shift) - 7.5f)/7.5f);
if(ctx.ch3_left) {
left += ch3_val;
}else {
left -= 1;
}
if(ctx.ch3_right) {
right += ch3_val;
}else {
right -= 1;
}
} else {
left -= 1;
right -= 1;
}
}
if(ctx.ch4_dac){
ch4_val = -1;
if(ctx.ch4_enable && (ctx.ch4_left || ctx.ch4_right)) {
ch4_val = ((ctx.ch4_lfsr & 0b1) == 0b1) ? (((float)ctx.ch4_volume - 7.5f)/7.5f) : -1.0f;
if(ctx.ch4_left) {
left += ch4_val;
}else {
left -= 1;
}
if(ctx.ch4_right) {
right += ch4_val;
} else {
right -= 1;
}
} else {
left -= 1;
right -= 1;
}
}
}
u8 left_vol = ctx.volume_left == 0 ? 1 : ctx.volume_left;
u8 right_vol = ctx.volume_right == 0 ? 1 : ctx.volume_right;
left *= (float)left_vol/7.0f;
right *= (float)right_vol/7.0f;
ctx.cycles_needed += emu_get_context()->fast_forward ? SAMPLES_PER_AUDIO_TICK/FAST_FORWARD_SPEED : SAMPLES_PER_AUDIO_TICK;
if(ctx.cycles_needed > 1){
ctx.cycles_needed -= 1;
bool dacs = ctx.ch1_dac || ctx.ch2_dac || ctx.ch3_dac || ctx.ch4_dac;
float left_out = 0;
float right_out = 0;
if(dacs) {
left_out = left - ctx.left_cap;
right_out = right - ctx.right_cap;
ctx.left_cap = left - left_out * 0.999958;
ctx.right_cap = right - right_out * 0.999958;
}
left_out /= 4;
right_out /= 4;
if(left_out < -1.0f) {
left_out = -1;
}
if(left_out > 1.0f) {
left_out = 1;
}
if(right_out < -1.0f) {
right_out = -1;
}
if(right_out > 1.0f) {
right_out = 1;
}
if(ctx.buffer_write_index < FRAMES_PER_BUFFER){
ctx.left_audio_buffer[(ctx.buffer_write_index)] = left_out;
ctx.right_audio_buffer[(ctx.buffer_write_index)] = right_out;
ctx.buffer_write_index++;
}
ctx.history_timer++;
if(ctx.history_timer >= HISTORY_INTERVAL){
ctx.history_timer = 0;
ctx.sq1_history[ctx.sq1_index++] = sq1_val;
if (ctx.sq1_index == 384) {
ctx.sq1_index = 0;
}
ctx.sq2_history[ctx.sq2_index++] = sq2_val;
if (ctx.sq2_index == 384) {
ctx.sq2_index = 0;
}
ctx.ch3_history[ctx.ch3_index++] = ch3_val;
if (ctx.ch3_index == 384) {
ctx.ch3_index = 0;
}
ctx.ch4_history[ctx.ch4_index++] = ch4_val;
if (ctx.ch4_index == 384) {
ctx.ch4_index = 0;
}
ctx.left_history[ctx.left_index++] = left_out;
if (ctx.left_index == 384) {
ctx.left_index = 0;
}
ctx.right_history[ctx.right_index++] = right_out;
if (ctx.right_index == 384) {
ctx.right_index = 0;
}
}
if(ctx.buffer_write_index == FRAMES_PER_BUFFER) {
ctx.buffer_write_index = 0;
float *data[2];
data[0] = ctx.left_audio_buffer;
data[1] = ctx.right_audio_buffer;
int err = Pa_WriteStream(stream, data, FRAMES_PER_BUFFER);
if(err != paNoError && err != paOutputUnderflowed) {
fprintf(stderr, "portaudio stream error\n\tError Number: %d\n\tError Message: %s\n", err, Pa_GetErrorText(err));
}
}
}
}
bool skipped = false;
void audio_period_tick() {
ctx.period_tick++;
if(ctx.period_tick % 2 == 0){
ctx.sq1_period_timer++;
ctx.sq2_period_timer++;
if(ctx.sq1_period_timer >= 0x800) {
ctx.sq1_period_timer = ctx.sq1_period_reset;
ctx.sq1_sample = (ctx.sq1_sample + 1) % 8;
}
if(ctx.sq2_period_timer >= 0x800) {
ctx.sq2_period_timer = ctx.sq2_period_reset;
ctx.sq2_sample = (ctx.sq2_sample + 1) % 8;
}
}
ctx.ch3_period_timer++;
if(ctx.ch3_period_timer >= 0x800) {
ctx.ch3_period_timer = ctx.ch3_period_reset;
ctx.ch3_sample = (ctx.ch3_sample + 1) % 32;
if((ctx.ch3_sample & 0b1) == 0b1) {
ctx.ch3_last_sample = ctx.wave_ram[ctx.ch3_sample >> 1] & 0xF;
} else {
ctx.ch3_last_sample = ctx.wave_ram[ctx.ch3_sample >> 1] >> 4;
}
}
}
void audio_tick(){
u32 prev_ticks = ctx.ticks;
ctx.ticks++;
if((ctx.ticks % 2) == 0) {
void audio_tick(){
u32 prev_ticks = ticks;
ticks++;
if((ticks % 2) == 0) {
if(ctx.sq1_len_enable) {
ctx.sq1_len++;
if(ctx.sq1_len >= 64) {
@ -426,6 +445,7 @@ void audio_tick(){
if(ctx.ch4_len_enable && ctx.ch4_enable) {
ctx.ch4_len++;
//printf("Ch4 len: %02X\n", ctx.ch4_len);
if(ctx.ch4_len >= 64) {
ctx.ch4_len = 0;
ctx.ch4_enable = false;
@ -434,7 +454,7 @@ void audio_tick(){
}
}
if((prev_ticks & (1 << 2)) && !(ctx.ticks & (1 << 2))) {
if((prev_ticks & (1 << 2)) && !(ticks & (1 << 2))) {
if(ctx.sq1_env_pace != 0){
ctx.sq1_env_timer++;
if(ctx.sq1_env_timer >= ctx.sq1_env_pace) {
@ -460,26 +480,30 @@ void audio_tick(){
if(ctx.sq2_volume > 15)
ctx.sq2_volume = 15;
}
//printf("sq2 vol: %01X\n", ctx.sq2_volume);
}
}
//if(ctx.ch4_env_pace != 0){
ctx.ch4_env_timer--;
if(ctx.ch4_env_timer <= 0) {
ctx.ch4_env_timer = ctx.ch4_env_pace_buffer != 0 ? ctx.ch4_env_pace_buffer : 8;
if(ctx.ch4_env_pace != 0 && ((ctx.ch4_env_direction && ctx.ch4_volume != 15) || (!ctx.ch4_env_direction && ctx.ch4_volume != 0))){
ctx.ch4_volume += ctx.ch4_env_direction ? 1 : -1;
//printf("Noise Vol: %02X\n", ctx.ch4_volume);
if(ctx.ch4_volume < 0)
ctx.ch4_volume = 0;
if(ctx.ch4_volume > 15)
ctx.ch4_volume = 15;
}
}
//}
}
if((prev_ticks & (1 << 1)) && !(ctx.ticks & (1 << 1)) && ctx.sq1_sweep_enabled) {
if((prev_ticks & (1 << 1)) && !(ticks & (1 << 1)) && ctx.sq1_sweep_enabled) {
ctx.sq1_sweep_timer--;
if(ctx.sq1_sweep_timer <= 0){
if(ctx.sq1_sweep_timer <= 0){//(ctx.sq1_sweep_timer >= ctx.sq1_sweep_pace && ctx.sq1_sweep_pace > 0) || (ctx.sq1_sweep_timer >= 8 && ctx.sq1_sweep_pace == 0)) {
ctx.sq1_sweep_timer = ctx.sq1_sweep_pace != 0 ? ctx.sq1_sweep_pace : 8;
if(ctx.sq1_enable && ctx.sq1_sweep_pace > 0 && ctx.sq1_sweep_enabled){
sq1_sweep();
@ -527,20 +551,23 @@ void enable_wave() {
}
ctx.ch3_enable = true;
ctx.ch3_sample = 0;
//ctx.ch3_volume = ctx.ch3_initial_volume;
ctx.ch3_period_timer = ctx.ch3_period_reset;
}
void enable_noise() {
if(!ctx.ch4_dac){
return;
}
start = get_ticks();
ctx.ch4_enable = true;
ctx.ch4_env_timer = ctx.ch4_env_pace_buffer != 0 ? ctx.ch4_env_pace_buffer : 8;
ctx.ch4_env_direction = ctx.ch4_env_direction_buffer;
ctx.ch4_env_pace = ctx.ch4_env_pace_buffer;
ctx.ch4_volume = ctx.ch4_initial_volume;
ctx.ch4_lfsr = 0;
ctx.lfsr_timer = (ctx.ch4_clock_divider > 0 ? (ctx.ch4_clock_divider << 4) : 8) << ctx.ch4_clock_shift;
if(!ctx.ch4_dac){
ctx.ch4_enable = false;
}
lfsr_clock = lfsr_clock_buffer;
lfsr_timer = 0;
}
u8 audio_read(u16 address) {
@ -750,6 +777,7 @@ void audio_write(u16 address, u8 value){
if(address == 0xFF26) {
ctx.audio_enabled = (value & 0x80) == 0x80;
if(!ctx.audio_enabled) {
//printf("audio disabled\n");
reset_buffers();
}
}
@ -768,11 +796,14 @@ void audio_write(u16 address, u8 value){
ctx.ch3_right = value & 0b00000100;
ctx.ch2_right = value & 0b00000010;
ctx.ch1_right = value & 0b00000001;
//printf("write at %02X; Value: %02X\n", address, value);
}
if(address == 0xFF24) {
ctx.volume_left = (value >> 4) & 0b111;
//if(ctx.volume_left == 0) ctx.volume_left = 1;
ctx.volume_right = value & 0b111;
//if(ctx.volume_right == 0) ctx.volume_right = 1;
ctx.vin_left = value & 0x80;
ctx.vin_right = value & 0x8;
}
@ -788,6 +819,7 @@ void audio_write(u16 address, u8 value){
ctx.sq1_initial_len = value & 0x3F;
ctx.sq1_len = ctx.sq1_initial_len;
ctx.ch1_len_fz = false;
//printf("initial len: %02X\n", ctx.sq1_initial_len);
}
if(address == 0xFF12) {
ctx.sq1_initial_volume = (value >> 4) & 0x0F;
@ -809,7 +841,7 @@ void audio_write(u16 address, u8 value){
}
ctx.sq1_period_reset = (ctx.sq1_period_reset & 0x0FF) | ((value & 0b111) << 8);
bool len_en = (value & 0x40) == 0x40;
if((ctx.ticks % 2) == 0 && !ctx.ch1_len_fz && !ctx.sq1_len_enable && len_en){
if((ticks % 2) == 0 && !ctx.ch1_len_fz && !ctx.sq1_len_enable && len_en){
ctx.sq1_len++;
if(ctx.sq1_len >= 64) {
ctx.sq1_len = 0;
@ -817,7 +849,7 @@ void audio_write(u16 address, u8 value){
ctx.ch1_len_fz = true;
}
}
if((ctx.ticks % 2) == 0 && ctx.ch1_len_fz && (value & 0x80) == 0x80){
if((ticks % 2) == 0 && ctx.ch1_len_fz && (value & 0x80) == 0x80){
ctx.ch1_len_fz = false;
if(len_en){
ctx.sq1_len++;
@ -850,6 +882,7 @@ void audio_write(u16 address, u8 value){
if(address == 0xFF18) {
u16 prev_period = ctx.sq2_period_reset;
ctx.sq2_period_reset = (ctx.sq2_period_reset & 0xF00) | value;
//printf("period: %03X, old_period: %03X\n", ctx.sq2_period_reset, prev_period);
}
if(address == 0xFF19) {
if(ctx.sq2_len == 64) {
@ -857,7 +890,7 @@ void audio_write(u16 address, u8 value){
}
ctx.sq2_period_reset = (ctx.sq2_period_reset & 0x0FF) | ((value & 0b111) << 8);
bool len_en = (value & 0x40) == 0x40;
if((ctx.ticks % 2) == 0 && !ctx.ch2_len_fz && !ctx.sq2_len_enable && len_en){
if((ticks % 2) == 0 && !ctx.ch2_len_fz && !ctx.sq2_len_enable && len_en){
ctx.sq2_len++;
if(ctx.sq2_len >= 64) {
ctx.sq2_len = 0;
@ -865,7 +898,7 @@ void audio_write(u16 address, u8 value){
ctx.ch2_len_fz = true;
}
}
if((ctx.ticks % 2) == 0 && ctx.ch2_len_fz && (value & 0x80) == 0x80){
if((ticks % 2) == 0 && ctx.ch2_len_fz && (value & 0x80) == 0x80){
ctx.ch2_len_fz = false;
if(len_en){
ctx.sq2_len++;
@ -881,6 +914,7 @@ void audio_write(u16 address, u8 value){
ctx.ch3_dac = value >> 7;
if(!ctx.ch3_dac){
ctx.ch3_enable = false;
//printf("ch3 off\n");
}
}
@ -892,6 +926,7 @@ void audio_write(u16 address, u8 value){
if(address == 0xFF1C) {
ctx.ch3_volume = (value >> 5) & 0b11;
//printf("Ch3 vol: %d\n", ctx.ch3_volume);
}
if(address == 0xFF1D) {
@ -901,7 +936,7 @@ void audio_write(u16 address, u8 value){
if(address == 0xFF1E) {
ctx.ch3_period_reset = (ctx.ch3_period_reset & 0x0FF) | ((value & 0b111) << 8);
bool len_en = (value & 0x40) == 0x40;
if((ctx.ticks % 2) == 0 && !ctx.ch3_len_fz && !ctx.ch3_len_enable && len_en){
if((ticks % 2) == 0 && !ctx.ch3_len_fz && !ctx.ch3_len_enable && len_en){
if(ctx.ch3_len >= 255) {
ctx.ch3_len = 0;
ctx.ch3_enable = false;
@ -910,7 +945,7 @@ void audio_write(u16 address, u8 value){
ctx.ch3_len++;
}
}
if((ctx.ticks % 2) == 0 && ctx.ch3_len_fz && (value & 0x80) == 0x80){
if((ticks % 2) == 0 && ctx.ch3_len_fz && (value & 0x80) == 0x80){
ctx.ch3_len_fz = false;
if(len_en){
ctx.ch3_len++;
@ -926,6 +961,8 @@ void audio_write(u16 address, u8 value){
ctx.ch4_initial_len = value & 0b111111;
ctx.ch4_len = ctx.ch4_initial_len;
ctx.ch4_len_fz = false;
//printf("ch4 len: %02X\n", ctx.ch4_len);
printf("Write Ch4 Len: %02X\n", value);
}
if(address == 0xFF21) {
@ -938,12 +975,18 @@ void audio_write(u16 address, u8 value){
} else {
ctx.ch4_dac = true;
}
printf("Write Ch4 env: %02X\n", value);
}
if(address == 0xFF22) {
ctx.ch4_clock_shift = (value >> 4) & 0xF;
ctx.ch4_lfsr_width = (value & 0x08);
ctx.ch4_clock_divider = value & 0b111;
float div = (ctx.ch4_clock_divider == 0 ? 0.5f : (float)ctx.ch4_clock_divider);
float lfsr_rate = (LFSR_BASE_CLOCK) / (div * (float)(1 << ctx.ch4_clock_shift));
lfsr_clock_buffer = 1.0f / (lfsr_rate/1000.0f/1000.0f);
//printf("Ch4 clock: Shift: %01X, Width: %d, Div: %f (%01X), Rate: %f, Clock %f\n", ctx.ch4_clock_shift, ctx.ch4_lfsr_width, div, ctx.ch4_clock_divider, lfsr_rate, lfsr_clock);
printf("Write Ch4 Clock: %02X\n", value);
}
if(address == 0xFF23) {
@ -951,7 +994,7 @@ void audio_write(u16 address, u8 value){
ctx.ch4_len = 0;
}
bool len_en = (value & 0x40) == 0x40;
if((ctx.ticks % 2) == 0 && !ctx.ch4_len_fz && !ctx.ch4_len_enable && len_en){
if((ticks % 2) == 0 && !ctx.ch4_len_fz && !ctx.ch4_len_enable && len_en){
ctx.ch4_len++;
if(ctx.ch4_len >= 64) {
ctx.ch4_len = 0;
@ -959,15 +1002,17 @@ void audio_write(u16 address, u8 value){
ctx.ch4_len_fz = true;
}
}
if((ctx.ticks % 2) == 0 && ctx.ch4_len_fz && (value & 0x80) == 0x80){
if((ticks % 2) == 0 && ctx.ch4_len_fz && (value & 0x80) == 0x80){
ctx.ch4_len_fz = false;
if(len_en){
ctx.ch4_len++;
}
}
ctx.ch4_len_enable = len_en;
//printf("ch4 trigger: LenEn %d\n", len_en);
if(value & 0x80) {
enable_noise();
}
printf("Write Ch4 Trigger: %02X\n", value);
}
}

6
lib/timer.c
View File

@ -39,14 +39,12 @@ void timer_tick() {
}
}
audio_sample_tick();
if((prev_div & (1 << 12)) && (!(ctx.div & (1 << 12)))){
audio_tick();
}
if((prev_div & (1 << 0)) && (!(ctx.div & (1 << 0)))){
audio_period_tick();
if((prev_div & (1 << 1)) && (!(ctx.div & (1 << 1)))){
//audio_period_tick();
}
}

8
lib/ui.c
View File

@ -282,11 +282,13 @@ void ui_update() {
update_debug_window();
}
static bool ff = false;
void ui_on_key(bool down, u32 key_code) {
if(key_code == SDLK_SPACE && down == true) {
emu_get_context()->fast_forward = !emu_get_context()->fast_forward;
if(emu_get_context()->fast_forward){
ppu_get_context()->target_frame_time = 1000/(60 * FAST_FORWARD_SPEED);
ff = !ff;
if(ff){
ppu_get_context()->target_frame_time = 1000/300;
} else {
ppu_get_context()->target_frame_time = 1000/60;
}