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reduce CPU usage massively

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scratchminer 2024-01-23 01:41:20 -05:00
parent 17f4cab32d
commit 509d20c215
3 changed files with 70 additions and 61 deletions
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123
extern/pwrnoise/pwrnoise.c vendored
View file

@ -40,22 +40,23 @@ void pwrnoise_noise_write(noise_channel_t *chan, uint8_t reg, uint8_t val) {
}
}
void pwrnoise_noise_step(noise_channel_t *chan) {
chan->octave_counter++;
if (chan->enable && !(((chan->octave_counter - 1) >> chan->octave) & 0x0001) && ((chan->octave_counter >> chan->octave) & 0x0001)) {
if ((++chan->period_counter) == 4096) {
void pwrnoise_noise_step(noise_channel_t *chan, uint16_t cycles) {
if (!chan->enable) chan->out_latch = 0;
chan->octave_counter += cycles;
if (chan->enable && (cycles > 2 || !(((chan->octave_counter - 1) >> chan->octave) & 0x0001) && ((chan->octave_counter >> chan->octave) & 0x0001))) {
chan->period_counter += (cycles >> (chan->octave + 1));
if (cycles == 1) ++chan->period_counter;
if (chan->period_counter >= 4096) {
chan->prev = (uint8_t)(chan->lfsr >> 15);
uint16_t in = ((chan->lfsr >> chan->tapa) ^ (chan->tapb_enable ? (chan->lfsr >> chan->tapb) : 0)) & 0x0001;
chan->lfsr = (chan->lfsr << 1) | in;
chan->period_counter = chan->period;
chan->period_counter = chan->period + (chan->period_counter - 4096);
}
}
uint8_t out = chan->prev;
if (!chan->enable) out = 0;
else if (out != 0) out = chan->vol;
chan->out_latch = out;
chan->out_latch = (chan->prev != 0) ? chan->vol : 0;
}
void pwrnoise_slope_write(slope_channel_t *chan, uint8_t reg, uint8_t val) {
@ -96,9 +97,18 @@ void pwrnoise_slope_write(slope_channel_t *chan, uint8_t reg, uint8_t val) {
}
}
void pwrnoise_slope_step(slope_channel_t *chan, bool force_zero) {
if (chan->enable && !((chan->octave_counter++ >> chan->octave) & 0x0001) && ((chan->octave_counter >> chan->octave) & 0x0001)) {
if ((++chan->period_counter) == 4096) {
void pwrnoise_slope_step(slope_channel_t *chan, uint16_t cycles, bool force_zero) {
if (!chan->enable) {
chan->out_latch = 0;
return;
}
chan->octave_counter += cycles;
if (chan->enable && (cycles > 2 || !(((chan->octave_counter - 1) >> chan->octave) & 0x0001) && ((chan->octave_counter >> chan->octave) & 0x0001))) {
chan->period_counter += (cycles >> (chan->octave + 1));
if (cycles == 1) ++chan->period_counter;
if (chan->period_counter >= 4096) {
if (!chan->portion) {
if ((chan->flags & 0x02) != 0) chan->accum -= chan->aoffset;
else chan->accum += chan->aoffset;
@ -126,48 +136,47 @@ void pwrnoise_slope_step(slope_channel_t *chan, bool force_zero) {
}
}
chan->period_counter = chan->period;
chan->period_counter = chan->period + (chan->period_counter - 4096);
uint8_t left = chan->accum >> 3;
uint8_t right = chan->accum >> 3;
switch (chan->vol >> 4) {
case 0:
case 1:
left >>= 1;
case 2:
case 3:
left >>= 1;
case 4:
case 5:
case 6:
case 7:
left >>= 1;
default: break;
}
switch (chan->vol & 0xf) {
case 0:
case 1:
right >>= 1;
case 2:
case 3:
right >>= 1;
case 4:
case 5:
case 6:
case 7:
right >>= 1;
default: break;
}
left &= (chan->vol >> 4);
right &= (chan->vol & 0xf);
chan->prev = (left << 4) | right;
}
}
uint8_t left = chan->accum >> 3;
uint8_t right = chan->accum >> 3;
switch (chan->vol >> 4) {
case 0:
case 1:
left >>= 1;
case 2:
case 3:
left >>= 1;
case 4:
case 5:
case 6:
case 7:
left >>= 1;
default: break;
}
switch (chan->vol & 0xf) {
case 0:
case 1:
right >>= 1;
case 2:
case 3:
right >>= 1;
case 4:
case 5:
case 6:
case 7:
right >>= 1;
default: break;
}
left &= (chan->vol >> 4);
right &= (chan->vol & 0xf);
uint8_t out = (left << 4) | right;
if (!chan->enable || force_zero) out = 0;
chan->out_latch = out;
chan->out_latch = force_zero ? 0 : chan->prev;
}
void pwrnoise_reset(power_noise_t *pn) {
@ -200,14 +209,14 @@ void pwrnoise_write(power_noise_t *pn, uint8_t reg, uint8_t val) {
}
}
void pwrnoise_step(power_noise_t *pn, int16_t *left, int16_t *right) {
void pwrnoise_step(power_noise_t *pn, uint16_t cycles, int16_t *left, int16_t *right) {
int32_t final_left, final_right;
if ((pn->flags & 0x80) != 0) {
pwrnoise_noise_step(&pn->n1);
pwrnoise_noise_step(&pn->n2);
pwrnoise_noise_step(&pn->n3);
pwrnoise_slope_step(&pn->s, (pn->n1.am && !(pn->n1.prev)) || (pn->n2.am && !(pn->n2.prev)) || (pn->n3.am && !(pn->n3.prev)));
pwrnoise_noise_step(&pn->n1, cycles);
pwrnoise_noise_step(&pn->n2, cycles);
pwrnoise_noise_step(&pn->n3, cycles);
pwrnoise_slope_step(&pn->s, cycles, (pn->n1.am && !(pn->n1.prev)) || (pn->n2.am && !(pn->n2.prev)) || (pn->n3.am && !(pn->n3.prev)));
final_left = (pn->n1.out_latch >> 4) + (pn->n2.out_latch >> 4) + (pn->n3.out_latch >> 4) + (pn->s.out_latch >> 4);
final_right = (pn->n1.out_latch & 0xf) + (pn->n2.out_latch & 0xf) + (pn->n3.out_latch & 0xf) + (pn->s.out_latch & 0xf);

3
extern/pwrnoise/pwrnoise.h vendored
View file

@ -52,6 +52,7 @@ typedef struct {
uint8_t vol;
uint8_t out_latch;
uint8_t prev;
} slope_channel_t;
typedef struct {
@ -66,7 +67,7 @@ typedef struct {
} power_noise_t;
void pwrnoise_reset(power_noise_t *pn);
void pwrnoise_step(power_noise_t *pn, int16_t *left, int16_t *right);
void pwrnoise_step(power_noise_t *pn, uint16_t cycles, int16_t *left, int16_t *right);
void pwrnoise_write(power_noise_t *pn, uint8_t reg, uint8_t val);
#ifdef __cplusplus

5
src/engine/platform/powernoise.cpp
View file

@ -19,6 +19,7 @@
#include "powernoise.h"
#include "../engine.h"
#include "../../ta-log.h"
#include "furIcons.h"
#include <math.h>
@ -81,9 +82,7 @@ void DivPlatformPowerNoise::acquire(short** buf, size_t len) {
int16_t left, right;
for (size_t h=0; h<len; h++) {
for(int i = 0; i < 32; i++) {
pwrnoise_step(&pn, &left, &right);
}
pwrnoise_step(&pn, 32, &left, &right);
oscBuf[0]->data[oscBuf[0]->needle++]=mapAmp(((pn.n1.out_latch>>1)&0x7)+(pn.n1.out_latch>>5));
oscBuf[1]->data[oscBuf[1]->needle++]=mapAmp(((pn.n2.out_latch>>1)&0x7)+(pn.n2.out_latch>>5));