Floating Point Dither For All

4 files changed, 25 insertions, 55 deletions

diff --git a/plugins/WinVST/Drive/.vs/VSTProject/v14/.suo b/plugins/WinVST/Drive/.vs/VSTProject/v14/.suo
index da1c31d..7c0342c 100755
--- a/plugins/WinVST/Drive/.vs/VSTProject/v14/.suo
+++ b/plugins/WinVST/Drive/.vs/VSTProject/v14/.suo
diff --git a/plugins/WinVST/Drive/Drive.cpp b/plugins/WinVST/Drive/Drive.cpp
index 35d0594..ac5f228 100755
--- a/plugins/WinVST/Drive/Drive.cpp
+++ b/plugins/WinVST/Drive/Drive.cpp
@@ -20,12 +20,9 @@ Drive::Drive(audioMasterCallback audioMaster) :
 	iirSampleBL = 0.0;
 	iirSampleAR = 0.0;
 	iirSampleBR = 0.0;
-	
-	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/Drive/Drive.h b/plugins/WinVST/Drive/Drive.h
index c7039c5..525a09e 100755
--- a/plugins/WinVST/Drive/Drive.h
+++ b/plugins/WinVST/Drive/Drive.h
@@ -55,17 +55,14 @@ private:
     char _programName[kVstMaxProgNameLen + 1];
     std::set< std::string > _canDo;
     
-	long double fpNShapeLA;
-	long double fpNShapeLB;
-	long double fpNShapeRA;
-	long double fpNShapeRB;
-	bool fpFlip;
+	long double fpNShapeL;
+	long double fpNShapeR;
 	//default stuff
 	double iirSampleAL;
 	double iirSampleBL;
 	double iirSampleAR;
 	double iirSampleBR;
-		
+	bool fpFlip;
     float A;
     float B;
     float C;
diff --git a/plugins/WinVST/Drive/DriveProc.cpp b/plugins/WinVST/Drive/DriveProc.cpp
index 3670e85..074ccfd 100755
--- a/plugins/WinVST/Drive/DriveProc.cpp
+++ b/plugins/WinVST/Drive/DriveProc.cpp
@@ -26,9 +26,6 @@ void Drive::processReplacing(float **inputs, float **outputs, VstInt32 sampleFra
 	double glitch = 0.60;
 	double out;
 	
-	float fpTemp;
-	long double fpOld = 0.618033988749894848204586; //golden ratio!
-	long double fpNew = 1.0 - fpOld;	
 
 	long double inputSampleL;
 	long double inputSampleR;
@@ -95,6 +92,7 @@ void Drive::processReplacing(float **inputs, float **outputs, VstInt32 sampleFra
 			inputSampleR -= iirSampleBR;
 		}
 		//highpass section
+		fpFlip = !fpFlip;
 		
 		
 		if (inputSampleL > 1.0) inputSampleL = 1.0;
@@ -129,25 +127,14 @@ void Drive::processReplacing(float **inputs, float **outputs, VstInt32 sampleFra
 		//nice little output stage template: if we have another scale of floating point
 		//number, we really don't want to meaninglessly multiply that by 1.0.
 		
-		//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;
@@ -178,9 +165,6 @@ void Drive::processDoubleReplacing(double **inputs, double **outputs, VstInt32 s
 	double glitch = 0.60;
 	double out;
 	
-	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;
@@ -247,6 +231,7 @@ void Drive::processDoubleReplacing(double **inputs, double **outputs, VstInt32 s
 			inputSampleR -= iirSampleBR;
 		}
 		//highpass section
+		fpFlip = !fpFlip;
 		
 		
 		if (inputSampleL > 1.0) inputSampleL = 1.0;
@@ -281,25 +266,16 @@ void Drive::processDoubleReplacing(double **inputs, double **outputs, VstInt32 s
 		//nice little output stage template: if we have another scale of floating point
 		//number, we really don't want to meaninglessly multiply that by 1.0.
 		
-		//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;