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Revert "More minor SasAudio optimizations"

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Will reapply later in pieces.

This reverts commit cd251af345.
This commit is contained in:
Henrik Rydgard 2013-11-17 16:46:26 +01:00
parent 9f5402ce54
commit 5f51432de7
2 changed files with 21 additions and 31 deletions
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47
Core/HW/SasAudio.cpp
View file

@ -396,7 +396,7 @@ void SasInstance::MixVoice(SasVoice &voice) {
// Actually this is not entirely correct - we need to get one extra sample, and store it
// for the next time around. A little complicated...
// But for now, see Smoothness HACKERY below :P
u32 numSamples = (voice.sampleFrac + grainSize * voice.pitch) >> PSP_SAS_PITCH_SHIFT;
u32 numSamples = (voice.sampleFrac + grainSize * voice.pitch) / PSP_SAS_PITCH_BASE;
if ((int)numSamples > grainSize * 4) {
ERROR_LOG(SASMIX, "numSamples too large, clamping: %i vs %i", numSamples, grainSize * 4);
numSamples = grainSize * 4;
@ -421,7 +421,7 @@ void SasInstance::MixVoice(SasVoice &voice) {
if (volumeShift < 0) volumeShift = 0;
for (int i = 0; i < grainSize; i++) {
// For now: nearest neighbour, not even using the resample history at all.
int sample = resampleBuffer[(sampleFrac >> PSP_SAS_PITCH_SHIFT) + 2];
int sample = resampleBuffer[sampleFrac / PSP_SAS_PITCH_BASE + 2];
sampleFrac += voice.pitch;
// The maximum envelope height (PSP_SAS_ENVELOPE_HEIGHT_MAX) is (1 << 30) - 1.
@ -446,7 +446,7 @@ void SasInstance::MixVoice(SasVoice &voice) {
voice.sampleFrac = sampleFrac;
// Let's hope grainSize is a power of 2.
//voice.sampleFrac &= grainSize * PSP_SAS_PITCH_BASE - 1;
voice.sampleFrac -= numSamples << PSP_SAS_PITCH_SHIFT;
voice.sampleFrac -= numSamples * PSP_SAS_PITCH_BASE;
if (voice.envelope.HasEnded())
{
@ -685,16 +685,16 @@ static int durationFromRate(int rate) {
const short expCurveReference = 0x7000;
const float expCurveToEnvelopeHeight = (float)PSP_SAS_ENVELOPE_HEIGHT_MAX / (float)expCurveReference;
// This needs a rewrite / rethink. Doing all this per sample is insane.
static float computeExpCurveAt(int index, float invDuration) {
const int curveLength = ARRAY_SIZE(expCurve);
static int getExpCurveAt(int index, int duration) {
const short curveLength = sizeof(expCurve) / sizeof(short);
if (invDuration == 0.0f)
return 0.0f;
if (duration == 0) {
// Avoid division by zero, and thus undefined behaviour in conversion to int.
return 0;
}
float curveIndex = (index * curveLength) * invDuration;
float curveIndex = (index * curveLength) / (float) duration;
int curveIndex1 = (int) curveIndex;
int curveIndex2 = curveIndex1 + 1;
float curveIndexFraction = curveIndex - curveIndex1;
@ -705,7 +705,8 @@ static float computeExpCurveAt(int index, float invDuration) {
return expCurve[curveLength - 1];
}
return expCurve[curveIndex1] * (1.f - curveIndexFraction) + expCurve[curveIndex2] * curveIndexFraction;
float sample = expCurve[curveIndex1] * (1.f - curveIndexFraction) + expCurve[curveIndex2] * curveIndexFraction;
return (short)(sample);
}
ADSREnvelope::ADSREnvelope()
@ -720,14 +721,11 @@ ADSREnvelope::ADSREnvelope()
releaseType(PSP_SAS_ADSR_CURVE_MODE_LINEAR_DECREASE),
state_(STATE_OFF),
steps_(0),
height_(0),
type_(0),
rate_(0),
invDuration_(0) {
height_(0) {
}
void ADSREnvelope::WalkCurve(int type) {
float expFactor;
short expFactor;
switch (type) {
case PSP_SAS_ADSR_CURVE_MODE_LINEAR_INCREASE:
height_ += rate_;
@ -746,14 +744,14 @@ void ADSREnvelope::WalkCurve(int type) {
break;
case PSP_SAS_ADSR_CURVE_MODE_EXPONENT_DECREASE:
expFactor = computeExpCurveAt(steps_, invDuration_);
height_ = (s64)(expFactor * expCurveToEnvelopeHeight);
expFactor = getExpCurveAt(steps_, duration_);
height_ = (s64)expFactor * PSP_SAS_ENVELOPE_HEIGHT_MAX / expCurveReference;
height_ = PSP_SAS_ENVELOPE_HEIGHT_MAX - height_;
break;
case PSP_SAS_ADSR_CURVE_MODE_EXPONENT_INCREASE:
expFactor = computeExpCurveAt(steps_, invDuration_);
height_ = (s64)(expFactor * expCurveToEnvelopeHeight);
expFactor = getExpCurveAt(steps_, duration_);
height_ = (s64)expFactor * PSP_SAS_ENVELOPE_HEIGHT_MAX / expCurveReference;
break;
case PSP_SAS_ADSR_CURVE_MODE_DIRECT:
@ -789,14 +787,7 @@ void ADSREnvelope::SetState(ADSRState state) {
switch (type_) {
case PSP_SAS_ADSR_CURVE_MODE_EXPONENT_DECREASE:
case PSP_SAS_ADSR_CURVE_MODE_EXPONENT_INCREASE:
{
int duration = durationFromRate(rate_);
if (duration == 0) {
invDuration_ = 0.0f;
} else {
invDuration_ = 1.0f / (float)duration;
}
}
duration_ = durationFromRate(rate_);
break;
default:
break;

3
Core/HW/SasAudio.h
View file

@ -33,7 +33,6 @@ enum {
PSP_SAS_PITCH_MIN = 1,
PSP_SAS_PITCH_BASE = 0x1000,
PSP_SAS_PITCH_MAX = 0x4000,
PSP_SAS_PITCH_SHIFT = 12,
PSP_SAS_VOL_MAX = 0x1000,
@ -173,7 +172,7 @@ private:
// No need to save in state
int rate_;
int type_;
float invDuration_;
int duration_;
enum ADSRState {
STATE_ATTACK,