shithub: leaf

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new lookup table generation for skewed parameters

--- a/leaf/Src/leaf-math.c

+++ b/leaf/Src/leaf-math.c

@@ -556,7 +556,7 @@

 //0.001 base gives a good curve that goes from 1 to near zero

 void LEAF_generate_exp(float* buffer, float base, float start, float end, float offset, int size)

 {

-    float increment = (end - start) / (float)size;

+    float increment = (end - start) / (float)(size-1);

     float x = start;

     for (int i = 0; i < size; i++)

     {

@@ -565,17 +565,17 @@

     }

 }

-//0.001 base gives a good curve that goes from 1 to near zero

+//

 void LEAF_generate_table_skew_non_sym(float* buffer, float start, float end, float center, int size)

 {

-    float skew = logf (0.5f) / logf ((center - start) / (end - start));

-    float increment = (end - start) / (float)size;

-    float x = start;

-    float proportion = 0;

+    double skew = log (0.5) / log ((center - start) / (end - start));

+    double increment = 1.0 / (double)(size-1);

+    double x = 0.0;

+    double proportion = 0.0;

     for (int i = 0; i < size; i++)

     {

-        proportion = expf (logf (x) / skew);

-        buffer[i] = start + (end - start) * proportion;

+        proportion = exp (log(x) / skew);

+        buffer[i] = (float)(start + (end - start) * proportion);

         x += increment;

     }

 }

@@ -583,7 +583,7 @@

 void LEAF_generate_atodb(float* buffer, int size)

 {

-    float increment = 1.0f / (float)size;

+    float increment = 1.0f / (float)(size-1);

     float x = 0.0f;

     for (int i = 0; i < size; i++)

     {

@@ -595,7 +595,7 @@

 void LEAF_generate_atodbPositiveClipped(float* buffer, float lowerThreshold, float range, int size)

 {

-    float increment = 1.0f / (float)size;

+    float increment = 1.0f / (float)(size-1);

     float x = 0.0f;

     float scalar = range / fastabsf(lowerThreshold);

     for (int i = 0; i < size; i++)