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authorVito Caputo <vcaputo@pengaru.com>2020-02-03 15:30:53 -0800
committerVito Caputo <vcaputo@pengaru.com>2020-02-03 15:30:53 -0800
commit1c1ae5ee7243e731c7b44a11400e19bb8dab047b (patch)
tree7ac329dd1cea01e91530e9f7be0542dc678e60c1 /src/libs
parent6c357aefb327faeb6eca8809a6a60d0349dfc076 (diff)
libs/sig: add sig_ops_inv for additive inverse
aka negation
Diffstat (limited to 'src/libs')
-rw-r--r--src/libs/sig/Makefile.am2
-rw-r--r--src/libs/sig/ops_inv.c52
-rw-r--r--src/libs/sig/sig.h1
3 files changed, 54 insertions, 1 deletions
diff --git a/src/libs/sig/Makefile.am b/src/libs/sig/Makefile.am
index efec325..64715fe 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_ceil.c ops_clamp.c ops_const.c ops_floor.c ops_lerp.c ops_max.c ops_min.c ops_mult.c ops_pow.c ops_rand.c ops_round.c ops_sin.c sig.c sig.h
+libsig_a_SOURCES = ops_abs.c ops_ceil.c ops_clamp.c ops_const.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_sin.c sig.c sig.h
libsig_a_CPPFLAGS = -I@top_srcdir@/src
diff --git a/src/libs/sig/ops_inv.c b/src/libs/sig/ops_inv.c
new file mode 100644
index 0000000..abb1102
--- /dev/null
+++ b/src/libs/sig/ops_inv.c
@@ -0,0 +1,52 @@
+#include <assert.h>
+
+#include "sig.h"
+
+
+typedef struct ops_inv_ctxt_t {
+ sig_t *x;
+} ops_inv_ctxt_t;
+
+
+static size_t ops_inv_size(va_list ap)
+{
+ return sizeof(ops_inv_ctxt_t);
+}
+
+
+static void ops_inv_init(void *context, va_list ap)
+{
+ ops_inv_ctxt_t *ctxt = context;
+
+ assert(ctxt);
+
+ ctxt->x = va_arg(ap, sig_t *);
+}
+
+
+static void ops_inv_destroy(void *context)
+{
+ ops_inv_ctxt_t *ctxt = context;
+
+ assert(ctxt);
+
+ sig_free(ctxt->x);
+}
+
+
+static float ops_inv_output(void *context, unsigned ticks_ms)
+{
+ ops_inv_ctxt_t *ctxt = context;
+
+ assert(ctxt);
+
+ return -sig_output(ctxt->x, ticks_ms);
+}
+
+
+sig_ops_t sig_ops_inv = {
+ .size = ops_inv_size,
+ .init = ops_inv_init,
+ .destroy = ops_inv_destroy,
+ .output = ops_inv_output,
+};
diff --git a/src/libs/sig/sig.h b/src/libs/sig/sig.h
index bc2b28b..3456af9 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_ceil;
extern sig_ops_t sig_ops_clamp;
extern sig_ops_t sig_ops_floor;
+extern sig_ops_t sig_ops_inv;
extern sig_ops_t sig_ops_lerp;
extern sig_ops_t sig_ops_max;
extern sig_ops_t sig_ops_min;
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