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authorVito Caputo <vcaputo@pengaru.com>2020-02-03 16:31:40 -0800
committerVito Caputo <vcaputo@pengaru.com>2020-02-03 16:40:58 -0800
commit835be1c9e05f098885f628ecb43d9f851d468fdf (patch)
tree0035351a6b369bc36a670712668fa125f6eac876 /src
parent56ccd8fe1c195b7b204aef430b75b67e37481ef7 (diff)
libs/sig: add sig_ops_div
Included a little hack to defend against divide by zero, seems reasonable given the intended use cases.
Diffstat (limited to 'src')
-rw-r--r--src/libs/sig/Makefile.am2
-rw-r--r--src/libs/sig/ops_div.c61
-rw-r--r--src/libs/sig/sig.h1
3 files changed, 63 insertions, 1 deletions
diff --git a/src/libs/sig/Makefile.am b/src/libs/sig/Makefile.am
index 55eccd0..7c13a16 100644
--- a/src/libs/sig/Makefile.am
+++ b/src/libs/sig/Makefile.am
@@ -1,3 +1,3 @@
noinst_LIBRARIES = libsig.a
-libsig_a_SOURCES = ops_abs.c ops_add.c ops_ceil.c ops_clamp.c ops_const.c ops_expand.c ops_floor.c ops_inv.c ops_lerp.c ops_max.c ops_min.c ops_mult.c ops_pow.c ops_rand.c ops_round.c ops_scale.c ops_sin.c ops_sub.c sig.c sig.h
+libsig_a_SOURCES = ops_abs.c ops_add.c ops_ceil.c ops_clamp.c ops_const.c ops_div.c ops_expand.c ops_floor.c ops_inv.c ops_lerp.c ops_max.c ops_min.c ops_mult.c ops_pow.c ops_rand.c ops_round.c ops_scale.c ops_sin.c ops_sub.c sig.c sig.h
libsig_a_CPPFLAGS = -I@top_srcdir@/src
diff --git a/src/libs/sig/ops_div.c b/src/libs/sig/ops_div.c
new file mode 100644
index 0000000..d0fe4e3
--- /dev/null
+++ b/src/libs/sig/ops_div.c
@@ -0,0 +1,61 @@
+#include <assert.h>
+#include <float.h>
+
+#include "sig.h"
+
+
+typedef struct ops_div_ctxt_t {
+ sig_t *a, *b;
+} ops_div_ctxt_t;
+
+
+static size_t ops_div_size(va_list ap)
+{
+ return sizeof(ops_div_ctxt_t);
+}
+
+
+static void ops_div_init(void *context, va_list ap)
+{
+ ops_div_ctxt_t *ctxt = context;
+
+ assert(ctxt);
+
+ ctxt->a = va_arg(ap, sig_t *);
+ ctxt->b = va_arg(ap, sig_t *);
+}
+
+
+static void ops_div_destroy(void *context)
+{
+ ops_div_ctxt_t *ctxt = context;
+
+ assert(ctxt);
+
+ sig_free(ctxt->a);
+ sig_free(ctxt->b);
+}
+
+
+static float ops_div_output(void *context, unsigned ticks_ms)
+{
+ ops_div_ctxt_t *ctxt = context;
+ float divisor;
+
+ assert(ctxt);
+
+ /* XXX: protect against divide by zero by replacing with epsilon */
+ divisor = sig_output(ctxt->b, ticks_ms);
+ if (divisor == 0.f)
+ divisor = FLT_EPSILON;
+
+ return sig_output(ctxt->a, ticks_ms) / divisor;
+}
+
+
+sig_ops_t sig_ops_div = {
+ .size = ops_div_size,
+ .init = ops_div_init,
+ .destroy = ops_div_destroy,
+ .output = ops_div_output,
+};
diff --git a/src/libs/sig/sig.h b/src/libs/sig/sig.h
index 653202c..57b9a90 100644
--- a/src/libs/sig/sig.h
+++ b/src/libs/sig/sig.h
@@ -31,6 +31,7 @@ extern sig_ops_t sig_ops_abs;
extern sig_ops_t sig_ops_add;
extern sig_ops_t sig_ops_ceil;
extern sig_ops_t sig_ops_clamp;
+extern sig_ops_t sig_ops_div;
extern sig_ops_t sig_ops_expand;
extern sig_ops_t sig_ops_floor;
extern sig_ops_t sig_ops_inv;
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