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authorVito Caputo <vcaputo@pengaru.com>2020-02-03 16:09:00 -0800
committerVito Caputo <vcaputo@pengaru.com>2020-02-03 16:09:00 -0800
commit9fc2bb60b405ae3c2153c6842972e183f939acc0 (patch)
tree9441afb690b0cd6b3b3a77a99273f0e1e41c1053 /src/libs/sig
parent59b276edf6cd3d53fab1d45819a34ef1627e3389 (diff)
libs/sig: add sig_ops_expand convenience
This is a specialized version of sig_ops_scale which assumes a min..max range of -1..+1 nvidia register combiners docs describe this operation as "expand normal", and they have several variants, but I don't want to go too crazy here right now. Plain expand it is.
Diffstat (limited to 'src/libs/sig')
-rw-r--r--src/libs/sig/Makefile.am2
-rw-r--r--src/libs/sig/ops_expand.c56
-rw-r--r--src/libs/sig/sig.h1
3 files changed, 58 insertions, 1 deletions
diff --git a/src/libs/sig/Makefile.am b/src/libs/sig/Makefile.am
index e53a4bd..8ee3dbe 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_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 sig.c sig.h
+libsig_a_SOURCES = ops_abs.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 sig.c sig.h
libsig_a_CPPFLAGS = -I@top_srcdir@/src
diff --git a/src/libs/sig/ops_expand.c b/src/libs/sig/ops_expand.c
new file mode 100644
index 0000000..76791e4
--- /dev/null
+++ b/src/libs/sig/ops_expand.c
@@ -0,0 +1,56 @@
+#include <assert.h>
+
+#include "sig.h"
+
+
+typedef struct ops_expand_ctxt_t {
+ sig_t *value;
+} ops_expand_ctxt_t;
+
+
+static size_t ops_expand_size(va_list ap)
+{
+ return sizeof(ops_expand_ctxt_t);
+}
+
+
+/* expects a single sig_t: value
+ * input range is assumed to be 0..1, outputs expanded
+ * range of -1..+1
+ */
+static void ops_expand_init(void *context, va_list ap)
+{
+ ops_expand_ctxt_t *ctxt = context;
+
+ assert(ctxt);
+
+ ctxt->value = va_arg(ap, sig_t *);
+}
+
+
+static void ops_expand_destroy(void *context)
+{
+ ops_expand_ctxt_t *ctxt = context;
+
+ assert(ctxt);
+
+ sig_free(ctxt->value);
+}
+
+
+static float ops_expand_output(void *context, unsigned ticks_ms)
+{
+ ops_expand_ctxt_t *ctxt = context;
+
+ assert(ctxt);
+
+ return sig_output(ctxt->value, ticks_ms) * 2.f + 1.f;
+}
+
+
+sig_ops_t sig_ops_expand = {
+ .size = ops_expand_size,
+ .init = ops_expand_init,
+ .destroy = ops_expand_destroy,
+ .output = ops_expand_output,
+};
diff --git a/src/libs/sig/sig.h b/src/libs/sig/sig.h
index b54bfb7..f6cb189 100644
--- a/src/libs/sig/sig.h
+++ b/src/libs/sig/sig.h
@@ -30,6 +30,7 @@ extern sig_ops_t sig_ops_sqr;
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_expand;
extern sig_ops_t sig_ops_floor;
extern sig_ops_t sig_ops_inv;
extern sig_ops_t sig_ops_lerp;
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