summaryrefslogtreecommitdiff
path: root/src/libs
diff options
context:
space:
mode:
authorVito Caputo <vcaputo@pengaru.com>2020-02-03 16:52:25 -0800
committerVito Caputo <vcaputo@pengaru.com>2020-02-03 16:52:25 -0800
commit4e6e9a0b2a3d38900764ddabb1ad20830aa4b655 (patch)
tree0bb2128e19abc69cc78feba91d5593a5227a33f7 /src/libs
parent6cff7d0993de7d059c52ce737dca398d380dec88 (diff)
libs/sig: add sig_ops_inv
map 0-1 inputs to their inverse 1-0
Diffstat (limited to 'src/libs')
-rw-r--r--src/libs/sig/Makefile.am2
-rw-r--r--src/libs/sig/ops_inv.c55
-rw-r--r--src/libs/sig/sig.h1
3 files changed, 57 insertions, 1 deletions
diff --git a/src/libs/sig/Makefile.am b/src/libs/sig/Makefile.am
index 8ce9366..7e2537c 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_div.c ops_expand.c ops_floor.c ops_lerp.c ops_max.c ops_min.c ops_mult.c ops_neg.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_neg.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_inv.c b/src/libs/sig/ops_inv.c
new file mode 100644
index 0000000..99ef134
--- /dev/null
+++ b/src/libs/sig/ops_inv.c
@@ -0,0 +1,55 @@
+#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);
+}
+
+
+/* inverts 0-1 inputs to 1-0,
+ * assumes inputs will stay within 0-1 range
+ */
+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 1.f - 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 deb0ce3..635bfcc 100644
--- a/src/libs/sig/sig.h
+++ b/src/libs/sig/sig.h
@@ -34,6 +34,7 @@ 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;
extern sig_ops_t sig_ops_lerp;
extern sig_ops_t sig_ops_max;
extern sig_ops_t sig_ops_min;
© All Rights Reserved