Floating Point Dither For All

4 files changed, 22 insertions, 54 deletions

diff --git a/plugins/WinVST/PurestEcho/.vs/VSTProject/v14/.suo b/plugins/WinVST/PurestEcho/.vs/VSTProject/v14/.suo
index 1ddbf82..8746b94 100755
--- a/plugins/WinVST/PurestEcho/.vs/VSTProject/v14/.suo
+++ b/plugins/WinVST/PurestEcho/.vs/VSTProject/v14/.suo
diff --git a/plugins/WinVST/PurestEcho/PurestEcho.cpp b/plugins/WinVST/PurestEcho/PurestEcho.cpp
index 6b8c302..6bcaa3f 100755
--- a/plugins/WinVST/PurestEcho/PurestEcho.cpp
+++ b/plugins/WinVST/PurestEcho/PurestEcho.cpp
@@ -19,11 +19,8 @@ PurestEcho::PurestEcho(audioMasterCallback audioMaster) :
 	E = 0.0;
 	for(int count = 0; count < totalsamples-1; count++) {dL[count] = 0;dR[count] = 0;}
 	gcount = 0;
-	fpNShapeLA = 0.0;
-	fpNShapeLB = 0.0;
-	fpNShapeRA = 0.0;
-	fpNShapeRB = 0.0;
-	fpFlip = true;
+	fpNShapeL = 0.0;
+	fpNShapeR = 0.0;
 	//this is reset: values being initialized only once. Startup values, whatever they are.
 	
     _canDo.insert("plugAsChannelInsert"); // plug-in can be used as a channel insert effect.
diff --git a/plugins/WinVST/PurestEcho/PurestEcho.h b/plugins/WinVST/PurestEcho/PurestEcho.h
index a298dd2..870e158 100755
--- a/plugins/WinVST/PurestEcho/PurestEcho.h
+++ b/plugins/WinVST/PurestEcho/PurestEcho.h
@@ -62,11 +62,8 @@ private:
 	int gcount;
 	
 	
-	long double fpNShapeLA;
-	long double fpNShapeLB;
-	long double fpNShapeRA;
-	long double fpNShapeRB;
-	bool fpFlip;
+	long double fpNShapeL;
+	long double fpNShapeR;
 	//default stuff
 
     float A;
diff --git a/plugins/WinVST/PurestEcho/PurestEchoProc.cpp b/plugins/WinVST/PurestEcho/PurestEchoProc.cpp
index 77e4b2f..e8e141c 100755
--- a/plugins/WinVST/PurestEcho/PurestEchoProc.cpp
+++ b/plugins/WinVST/PurestEcho/PurestEchoProc.cpp
@@ -76,9 +76,6 @@ void PurestEcho::processReplacing(float **inputs, float **outputs, VstInt32 samp
 	double delaysBufferL;
 	double delaysBufferR;
 	
-	float fpTemp;
-	long double fpOld = 0.618033988749894848204586; //golden ratio!
-	long double fpNew = 1.0 - fpOld;	
 
 	long double inputSampleL;
 	long double inputSampleR;
@@ -177,25 +174,14 @@ void PurestEcho::processReplacing(float **inputs, float **outputs, VstInt32 samp
 		
 		gcount--;
 		
-		//noise shaping to 32-bit floating point
-		if (fpFlip) {
-			fpTemp = inputSampleL;
-			fpNShapeLA = (fpNShapeLA*fpOld)+((inputSampleL-fpTemp)*fpNew);
-			inputSampleL += fpNShapeLA;
-			fpTemp = inputSampleR;
-			fpNShapeRA = (fpNShapeRA*fpOld)+((inputSampleR-fpTemp)*fpNew);
-			inputSampleR += fpNShapeRA;
-		}
-		else {
-			fpTemp = inputSampleL;
-			fpNShapeLB = (fpNShapeLB*fpOld)+((inputSampleL-fpTemp)*fpNew);
-			inputSampleL += fpNShapeLB;
-			fpTemp = inputSampleR;
-			fpNShapeRB = (fpNShapeRB*fpOld)+((inputSampleR-fpTemp)*fpNew);
-			inputSampleR += fpNShapeRB;
-		}
-		fpFlip = !fpFlip;
-		//end noise shaping on 32 bit output
+		//stereo 32 bit dither, made small and tidy.
+		int expon; frexpf((float)inputSampleL, &expon);
+		long double dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
+		inputSampleL += (dither-fpNShapeL); fpNShapeL = dither;
+		frexpf((float)inputSampleR, &expon);
+		dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
+		inputSampleR += (dither-fpNShapeR); fpNShapeR = dither;
+		//end 32 bit dither
 
 		*out1 = inputSampleL;
 		*out2 = inputSampleR;
@@ -276,9 +262,6 @@ void PurestEcho::processDoubleReplacing(double **inputs, double **outputs, VstIn
 	double delaysBufferL;
 	double delaysBufferR;
 	
-	double fpTemp; //this is different from singlereplacing
-	long double fpOld = 0.618033988749894848204586; //golden ratio!
-	long double fpNew = 1.0 - fpOld;	
 
 	long double inputSampleL;
 	long double inputSampleR;
@@ -377,25 +360,16 @@ void PurestEcho::processDoubleReplacing(double **inputs, double **outputs, VstIn
 		
 		gcount--;
 		
-		//noise shaping to 64-bit floating point
-		if (fpFlip) {
-			fpTemp = inputSampleL;
-			fpNShapeLA = (fpNShapeLA*fpOld)+((inputSampleL-fpTemp)*fpNew);
-			inputSampleL += fpNShapeLA;
-			fpTemp = inputSampleR;
-			fpNShapeRA = (fpNShapeRA*fpOld)+((inputSampleR-fpTemp)*fpNew);
-			inputSampleR += fpNShapeRA;
-		}
-		else {
-			fpTemp = inputSampleL;
-			fpNShapeLB = (fpNShapeLB*fpOld)+((inputSampleL-fpTemp)*fpNew);
-			inputSampleL += fpNShapeLB;
-			fpTemp = inputSampleR;
-			fpNShapeRB = (fpNShapeRB*fpOld)+((inputSampleR-fpTemp)*fpNew);
-			inputSampleR += fpNShapeRB;
-		}
-		fpFlip = !fpFlip;
-		//end noise shaping on 64 bit output
+		//stereo 64 bit dither, made small and tidy.
+		int expon; frexp((double)inputSampleL, &expon);
+		long double dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
+		dither /= 536870912.0; //needs this to scale to 64 bit zone
+		inputSampleL += (dither-fpNShapeL); fpNShapeL = dither;
+		frexp((double)inputSampleR, &expon);
+		dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
+		dither /= 536870912.0; //needs this to scale to 64 bit zone
+		inputSampleR += (dither-fpNShapeR); fpNShapeR = dither;
+		//end 64 bit dither
 
 		*out1 = inputSampleL;
 		*out2 = inputSampleR;