ref: 7de74a9d01cbb87b74def34099ce2f30a0fb6e6e
parent: f2e11903bc2d80a73e21916e2929a18b6042c5f6
author: Paul Batchelor <[email protected]>
date: Fri Oct 30 05:01:45 EDT 2020
added gen_triangle
--- a/h/ftbl.h
+++ b/h/ftbl.h
@@ -14,3 +14,4 @@
int sp_ftbl_loadspa(sp_data *sp, sp_ftbl **ft, const char *filename);
int sp_gen_vals(sp_data *sp, sp_ftbl *ft, const char *string);
int sp_gen_sine(sp_data *sp, sp_ftbl *ft);
+void sp_gen_triangle(sp_data *sp, sp_ftbl *ft);
--- a/modules/ftbl.c
+++ b/modules/ftbl.c
@@ -104,3 +104,26 @@
}
return SP_OK;
}
+
+void sp_gen_triangle(sp_data *sp, sp_ftbl *ft)
+{+ unsigned int i;
+ unsigned int counter;
+ SPFLOAT incr;
+ int step;
+
+ incr = 1.0f / (SPFLOAT)ft->size;
+ incr *= 2;
+
+ step = 1;
+
+ counter = 0;
+
+ for (i = 0; i < ft->size; i++) {+ if (i == ft->size / 2) {+ step = -1;
+ }
+ ft->tbl[i] = (2.f*(counter * incr) - 1.f);
+ counter += step;
+ }
+}