DitherFloat update

3 files changed, 15 insertions, 19 deletions

diff --git a/plugins/LinuxVST/src/DitherFloat/DitherFloat.cpp b/plugins/LinuxVST/src/DitherFloat/DitherFloat.cpp
index ffd9e94..05213a6 100755
--- a/plugins/LinuxVST/src/DitherFloat/DitherFloat.cpp
+++ b/plugins/LinuxVST/src/DitherFloat/DitherFloat.cpp
@@ -14,8 +14,7 @@ DitherFloat::DitherFloat(audioMasterCallback audioMaster) :
 {
 	A = 0.0;
 	B = 1.0;
-	fpNShapeL = 0.0;
-	fpNShapeR = 0.0;
+	fpd = 17;
 	//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/LinuxVST/src/DitherFloat/DitherFloat.h b/plugins/LinuxVST/src/DitherFloat/DitherFloat.h
index b8ddf51..08cce74 100755
--- a/plugins/LinuxVST/src/DitherFloat/DitherFloat.h
+++ b/plugins/LinuxVST/src/DitherFloat/DitherFloat.h
@@ -53,8 +53,7 @@ private:
     char _programName[kVstMaxProgNameLen + 1];
     std::set< std::string > _canDo;
     
-	long double fpNShapeL;
-	long double fpNShapeR;
+	uint32_t fpd;
 	//default stuff
 
     float A;
diff --git a/plugins/LinuxVST/src/DitherFloat/DitherFloatProc.cpp b/plugins/LinuxVST/src/DitherFloat/DitherFloatProc.cpp
index 3c76a1a..a7121e8 100755
--- a/plugins/LinuxVST/src/DitherFloat/DitherFloatProc.cpp
+++ b/plugins/LinuxVST/src/DitherFloat/DitherFloatProc.cpp
@@ -67,16 +67,15 @@ void DitherFloat::processReplacing(float **inputs, float **outputs, VstInt32 sam
 		long double inputSampleR = *in2 + (gain-1);
 		
 		
-		
-		//stereo 32 bit dither, made small and tidy.
+
+		//begin stereo 32 bit floating point dither
 		int expon; frexpf((float)inputSampleL, &expon);
-		long double dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62) * blend;	//remove 'blend' for real use, it's for the demo;
-		inputSampleL += (dither-fpNShapeL); fpNShapeL = dither;
+		fpd ^= fpd<<13; fpd ^= fpd>>17; fpd ^= fpd<<5;
+		inputSampleL += (fpd*3.4e-36l*pow(2,expon+62)* blend);	//remove 'blend' for real use, it's for the demo;	
 		frexpf((float)inputSampleR, &expon);
-		dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62) * blend;	//remove 'blend' for real use, it's for the demo;
-		inputSampleR += (dither-fpNShapeR); fpNShapeR = dither;
-		//end 32 bit dither
-		
+		fpd ^= fpd<<13; fpd ^= fpd>>17; fpd ^= fpd<<5;
+		inputSampleR += (fpd*3.4e-36l*pow(2,expon+62)* blend);	//remove 'blend' for real use, it's for the demo;
+		//end stereo 32 bit floating point dither
 		
 		
 		inputSampleL = (float)inputSampleL; //equivalent of 'floor' for 32 bit floating point
@@ -154,15 +153,14 @@ void DitherFloat::processDoubleReplacing(double **inputs, double **outputs, VstI
 		
 		
 		
-		//stereo 32 bit dither, made small and tidy.
+		//begin stereo 32 bit floating point dither
 		int expon; frexpf((float)inputSampleL, &expon);
-		long double dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62) * blend;	//remove 'blend' for real use, it's for the demo;
-		inputSampleL += (dither-fpNShapeL); fpNShapeL = dither;
+		fpd ^= fpd<<13; fpd ^= fpd>>17; fpd ^= fpd<<5;
+		inputSampleL += (fpd*3.4e-36l*pow(2,expon+62)* blend);	//remove 'blend' for real use, it's for the demo;	
 		frexpf((float)inputSampleR, &expon);
-		dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62) * blend;	//remove 'blend' for real use, it's for the demo;
-		inputSampleR += (dither-fpNShapeR); fpNShapeR = dither;
-		//end 32 bit dither
-		
+		fpd ^= fpd<<13; fpd ^= fpd>>17; fpd ^= fpd<<5;
+		inputSampleR += (fpd*3.4e-36l*pow(2,expon+62)* blend);	//remove 'blend' for real use, it's for the demo;
+		//end stereo 32 bit floating point dither
 		
 		
 		inputSampleL = (float)inputSampleL; //equivalent of 'floor' for 32 bit floating point