From 9fc2bb60b405ae3c2153c6842972e183f939acc0 Mon Sep 17 00:00:00 2001 From: Vito Caputo Date: Mon, 3 Feb 2020 16:09:00 -0800 Subject: 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. --- src/libs/sig/Makefile.am | 2 +- src/libs/sig/ops_expand.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++ src/libs/sig/sig.h | 1 + 3 files changed, 58 insertions(+), 1 deletion(-) create mode 100644 src/libs/sig/ops_expand.c (limited to 'src/libs/sig') 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 + +#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; -- cgit v1.2.3