1 files changed, 136 insertions, 0 deletions
diff --git a/pansig~.c b/pansig~.c
new file mode 100644
index 0000000..346e94b
--- /dev/null
+++ b/pansig~.c
@@ -0,0 +1,136 @@
+#include "m_pd.h"
+#include <math.h>
+
+static t_class *pansig_class;
+
+/*  #define RADCONST 0.017453293 */
+#define RADCONST 0.785398163
+#define ROOT2DIV2 0.707106781
+
+typedef struct _pansig
+{
+  t_object x_obj;
+  float x_f;
+  float pan;
+  float left;
+  float right;
+} t_pansig;
+
+static void *pansig_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_pansig *x = (t_pansig *)pd_new(pansig_class);
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
+  outlet_new(&x->x_obj, gensym("signal"));
+  outlet_new(&x->x_obj, gensym("signal"));
+  //  inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("pansigf"));
+
+  x->x_f = 0;
+  return (x);
+}
+
+static void pansig_getpan(t_floatarg signal, t_floatarg *left, t_floatarg *right)
+{
+  double tmp, result;
+  double angle;
+  signal = signal < -1 ? -1 : signal;
+  signal = signal > 1 ? 1 : signal;
+  angle = signal * RADCONST;
+  *right  = ROOT2DIV2 * (cos(angle) + sin(angle));
+  *left  = ROOT2DIV2 * (cos(angle) - sin(angle));
+
+/*    if(signal < 0) */
+/*      signal = 0; */
+/*    if(signal > 0.999) */
+/*      signal = 0.999; */
+/*    tmp = (tan(1.5866 * signal - 0.785398) + 1) / 2; */
+/*    result = sqrt(tmp); */
+/*    if (result < 0) */
+/*      *right = 0; */
+/*    else if (result > 1) */
+/*      *right = 1; */
+/*    else */
+/*      *right = result; */
+/*    tmp = tmp * -1 + 1; */
+/*    if(tmp < 0)  */
+/*      tmp = 0; */
+/*    result = sqrt(tmp); */
+/*    if (result < 0) */
+/*      *left = 0; */
+/*    else if (result > 1) */
+/*      *left = 1; */
+/*    else */
+/*      *left = result; */
+}
+
+static t_int *pansig_perform(t_int *w)
+{
+  float *in1 = (t_float *)(w[1]);
+  float *in2 = (t_float *)(w[2]);
+  float *out1 = (t_float *)(w[3]);
+  float *out2 = (t_float *)(w[4]);
+  int n = (int)(w[5]);
+  t_pansig *x = (t_pansig *)(w[6]);
+  float value, value2, left, right;
+  while  (n--) 
+    {
+      value = *in1++;
+      value2 = *in2++;
+      pansig_getpan(value2, &left, &right);
+/*        *out1++ = value * x->left; */
+/*        *out2++ = value * x->right;  */
+      *out1++ = value * left;
+      *out2++ = value * right; 
+/*        *out1++ = value; */
+/*        *out2++ = value;  */
+    }
+  return (w+7);
+}
+
+static void pansig_dsp(t_pansig *x, t_signal **sp)
+{
+  int n = sp[0]->s_n;
+  float *in1 = sp[0]->s_vec;
+  float *in2 = sp[1]->s_vec;
+  float *out1 = sp[2]->s_vec;
+  float *out2 = sp[3]->s_vec;
+
+  dsp_add(pansig_perform, 6,
+	  in1, in2, out1, out2, n, x);
+}
+
+void pansig_f(t_pansig *x, t_floatarg f)
+{
+  double tmp, result;
+  if(f < 0)
+    f = 0;
+  if(f > 0.999)
+    f = 0.999;
+  tmp = (tan(1.5866 * f - 0.785398) + 1) / 2;
+  result = sqrt(tmp);
+  if (result < 0)
+    x->right = 0;
+  else if (result > 1)
+    x->right = 1;
+  else
+    x->right = result;
+  tmp = tmp * -1 + 1;
+  if(tmp < 0) 
+    tmp = 0;
+  result = sqrt(tmp);
+  if (result < 0)
+    x->left = 0;
+  else if (result > 1)
+    x->left = 1;
+  else
+    x->left = result;
+}
+
+void pansig_tilde_setup(void)
+{
+  pansig_class = class_new(gensym("pansig~"), (t_newmethod)pansig_new, 0,
+			sizeof(t_pansig), 0, A_GIMME, 0);
+  class_addmethod(pansig_class, nullfn, gensym("signal"), 0);
+
+  class_addmethod(pansig_class, (t_method)pansig_dsp, gensym("dsp"), 0);
+  //  class_addmethod(pansig_class, (t_method)pansig_f, gensym("pansigf"), A_FLOAT, 0);  
+}