added block-based AntialiasedSquareWaveOscillator::generate()

Author: Martin Klang

LibSource/SquareWaveOscillator.h

@@ -59,6 +59,48 @@ class AntialiasedSquareWaveOscillator : public OscillatorTemplate<AntialiasedSqu
     sample -= polyblep(fmod(phase + 1 - pw, 1), incr);
     return sample;
   }
+  void generate(FloatArray output){
+    float sample = phase < pw ? 1 : -1;
+    if(phase < incr){
+      float t = phase / incr;
+      sample += t+t - t*t - 1;
+    }
+    size_t len = output.getSize();
+    float* dest = output.getData();
+    while(len--){
+      phase += incr;
+      if(phase >= pw){
+	if(phase >= 1){
+	  // wrap phase
+	  phase -= 1;
+	  // correct current sample
+	  float t = (phase - incr) / incr;
+	  sample += t*t + t+t + 1;
+	  *dest++ = sample;
+	  sample = 1;
+	  // correct next sample
+	  t = phase / incr;
+	  sample += t+t - t*t - 1;
+	}else if(sample == 1){
+	  // correct current sample
+	  float t = (fmod(phase + 1 - pw, 1) - incr) / incr;
+	  sample -= t*t + t+t + 1;
+	  *dest++ = sample;
+	  sample = -1;
+	  // correct next sample
+	  t = fmod(phase + 1 - pw, 1) / incr;
+	  sample -= t+t - t*t - 1;
+	}else{
+	  *dest++ = sample;
+	  sample = -1;
+	}
+      }else{
+	*dest++ = sample;
+	sample = 1;
+      }
+    }
+  }
+  using OscillatorTemplate<AntialiasedSquareWaveOscillator>::generate;  
 };
 
 #endif /* __SquareWaveOscillator_h */