modules/signals: WIP experimental signals modulesignals

Playing with libs/sig in 2D

6 files changed, 196 insertions, 2 deletions

diff --git a/configure.ac b/configure.ac
index b75643a..b4bc9af 100644
--- a/configure.ac
+++ b/configure.ac
@@ -54,6 +54,7 @@ AC_CONFIG_FILES([
  src/modules/ray/Makefile
  src/modules/roto/Makefile
  src/modules/rtv/Makefile
+ src/modules/signals/Makefile
  src/modules/snow/Makefile
  src/modules/sparkler/Makefile
  src/modules/spiro/Makefile
diff --git a/src/Makefile.am b/src/Makefile.am
index 40d3254..94dcee5 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -4,4 +4,4 @@ rototiller_SOURCES = fb.c fb.h fps.c fps.h knobs.h rototiller.c rototiller.h sdl
 if ENABLE_DRM
 rototiller_SOURCES += drm_fb.c
 endif
-rototiller_LDADD = modules/compose/libcompose.a modules/drizzle/libdrizzle.a modules/flui2d/libflui2d.a modules/julia/libjulia.a modules/meta2d/libmeta2d.a modules/montage/libmontage.a modules/pixbounce/libpixbounce.a modules/plasma/libplasma.a modules/ray/libray.a modules/roto/libroto.a modules/rtv/librtv.a modules/snow/libsnow.a modules/sparkler/libsparkler.a modules/spiro/libspiro.a modules/stars/libstars.a modules/submit/libsubmit.a modules/swab/libswab.a libs/grid/libgrid.a libs/puddle/libpuddle.a libs/ray/libray.a libs/sig/libsig.a libs/txt/libtxt.a libs/ascii/libascii.a libs/din/libdin.a -lm
+rototiller_LDADD = modules/compose/libcompose.a modules/drizzle/libdrizzle.a modules/flui2d/libflui2d.a modules/julia/libjulia.a modules/meta2d/libmeta2d.a modules/montage/libmontage.a modules/pixbounce/libpixbounce.a modules/plasma/libplasma.a modules/ray/libray.a modules/roto/libroto.a modules/rtv/librtv.a modules/signals/libsignals.a modules/snow/libsnow.a modules/sparkler/libsparkler.a modules/spiro/libspiro.a modules/stars/libstars.a modules/submit/libsubmit.a modules/swab/libswab.a libs/grid/libgrid.a libs/puddle/libpuddle.a libs/ray/libray.a libs/sig/libsig.a libs/txt/libtxt.a libs/ascii/libascii.a libs/din/libdin.a -lm
diff --git a/src/modules/Makefile.am b/src/modules/Makefile.am
index 0f60d29..192e7a3 100644
--- a/src/modules/Makefile.am
+++ b/src/modules/Makefile.am
@@ -1 +1 @@
-SUBDIRS = compose drizzle flui2d julia meta2d montage pixbounce plasma ray roto rtv snow sparkler spiro stars submit swab
+SUBDIRS = compose drizzle flui2d julia meta2d montage pixbounce plasma ray roto rtv signals snow sparkler spiro stars submit swab
diff --git a/src/modules/signals/Makefile.am b/src/modules/signals/Makefile.am
new file mode 100644
index 0000000..75b6fd8
--- /dev/null
+++ b/src/modules/signals/Makefile.am
@@ -0,0 +1,3 @@
+noinst_LIBRARIES = libsignals.a
+libsignals_a_SOURCES = signals.c
+libsignals_a_CPPFLAGS = -I@top_srcdir@/src -I@top_srcdir@/src/libs
diff --git a/src/modules/signals/signals.c b/src/modules/signals/signals.c
new file mode 100644
index 0000000..2e929c3
--- /dev/null
+++ b/src/modules/signals/signals.c
@@ -0,0 +1,188 @@
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "fb.h"
+#include "rototiller.h"
+#include "sig/sig.h"
+
+/* Copyright (C) 2020 - Vito Caputo <vcaputo@pengaru.com> */
+
+/* 2D waveform drawings to exercise libs/sig and explore its ergonomics */
+
+#define N_SIGNALS	11
+
+typedef struct signals_context_t {
+	sig_t	*signals[N_SIGNALS];
+} signals_context_t;
+
+
+static void * signals_create_context(unsigned ticks, unsigned n_cpus)
+{
+	signals_context_t	*ctxt;
+
+	ctxt = calloc(1, sizeof(signals_context_t));
+	if (!ctxt)
+		return NULL;
+
+	ctxt->signals[0] = sig_new_sin(sig_new_const(.5f));			/* oscillate @ .5hz */
+	if (!ctxt->signals[0])
+		goto err;
+
+	ctxt->signals[1] =	sig_new_sin(					/* oscillate */
+					sig_new_scale(				/* at a scaled frequency */
+						sig_new_sin(sig_new_const(.1f)),/* from another oscillator @ .1hz */
+						sig_new_const(.2f),		/* from .2 */
+						sig_new_const(7.f)		/* to 7 */
+					)
+				);
+	if (!ctxt->signals[1])
+		goto err;
+
+	ctxt->signals[2] =	sig_new_lerp(					/* interpolate */
+					sig_new_sin(sig_new_const(.33f)),	/* a .33hz oscillator */
+					sig_new_sin(sig_new_const(.15f)),	/* and a .15hz oscillator */
+					sig_new_sin(sig_new_const(2.f))		/* weighted by a 2hz oscillator */
+				);
+	if (!ctxt->signals[2])
+		goto err;
+
+	ctxt->signals[3] =	sig_new_pow(	       				/* raise */
+					sig_new_sin(sig_new_const(4.f)),	/* a 4hz oscillator */
+					sig_new_sin(sig_new_const(.33f))	/* to the power of a .33f hz oscillator */
+				);
+	if (!ctxt->signals[3])
+		goto err;
+
+	ctxt->signals[4] =	sig_new_mult(	       		       		/* multiply */
+					sig_new_sin(sig_new_const(4.f)),	/* a 4hz oscillator */
+					sig_new_sin(sig_new_const(1.f))		/* by a 1hz oscillator */
+				);
+	if (!ctxt->signals[4])
+		goto err;
+
+	ctxt->signals[5] =	sig_new_lerp(					/* interpolate */
+					sig_ref(ctxt->signals[3]),		/* signals[3] */
+					sig_ref(ctxt->signals[4]),		/* signals[4] */
+					sig_ref(ctxt->signals[2])		/* weighted by signals[2] */
+				);
+	if (!ctxt->signals[5])
+		goto err;
+
+	ctxt->signals[6] =	sig_new_lerp(					/* interpolate */
+					sig_new_inv(sig_ref(ctxt->signals[5])),	/* invert of signals[5] */
+					sig_new_pow(sig_ref(ctxt->signals[5]),	/* with raised signals[5] */
+						sig_ref(ctxt->signals[3])),	/* to power of signals[3] */
+					sig_ref(ctxt->signals[2])		/* weighted by signals[2] */
+				);
+	if (!ctxt->signals[6])
+		goto err;
+
+	ctxt->signals[7] =	sig_new_mult(					/* multiply */
+					sig_ref(ctxt->signals[6]),		/* signals[6] */
+					sig_ref(ctxt->signals[5])		/* signals[5] */
+				);
+	if (!ctxt->signals[7])
+		goto err;
+
+	ctxt->signals[8] =	sig_new_mult(					/* multiply */
+					sig_ref(ctxt->signals[1]),		/* signals[1] */
+					sig_ref(ctxt->signals[7])		/* signals[7] */
+				);
+	if (!ctxt->signals[8])
+		goto err;
+
+	ctxt->signals[9] =	sig_new_pow(					/* raise */
+					sig_ref(ctxt->signals[3]),		/* signals[3] */
+					sig_new_scale(				/* to power of scaled */
+						sig_ref(ctxt->signals[7]),	/* signals[7] */
+						sig_new_const(.1f),		/* into range .1f .. */
+						sig_new_const(20.f)		/* to 20.f */
+					)
+				);
+	if (!ctxt->signals[9])
+		goto err;
+
+	ctxt->signals[10] =	sig_new_lerp(					/* interpolate */
+					sig_ref(ctxt->signals[9]),		/* signals[9] */
+					sig_new_rand(),				/* random noise */
+					sig_new_lerp(				/* weighted by interpolating */
+						sig_new_inv(			/* inverted ... */
+							sig_ref(ctxt->signals[5])),/* signals[5] */
+						sig_ref(ctxt->signals[3]),	/* and signals[3] */
+						sig_ref(ctxt->signals[1])	/* weighted by signals[1] */
+					)
+				);
+	if (!ctxt->signals[10])
+		goto err;
+
+	return ctxt;
+
+err:
+	for (unsigned i = 0; i < N_SIGNALS; i++)
+		sig_free(ctxt->signals[i]);
+
+	free(ctxt);
+
+	return NULL;
+}
+
+
+static void signals_destroy_context(void *context)
+{
+	signals_context_t	*ctxt = context;
+
+	for (unsigned i = 0; i < N_SIGNALS; i++)
+		sig_free(ctxt->signals[i]);
+
+	free(ctxt);
+}
+
+
+static int signals_fragmenter(void *context, const fb_fragment_t *fragment, unsigned number, fb_fragment_t *res_fragment)
+{
+	signals_context_t	*ctxt = context;
+
+	return fb_fragment_slice_single(fragment, N_SIGNALS, number, res_fragment);
+}
+
+
+static void signals_prepare_frame(void *context, unsigned ticks, unsigned n_cpus, fb_fragment_t *fragment, rototiller_fragmenter_t *res_fragmenter)
+{
+	*res_fragmenter = signals_fragmenter;
+}
+
+
+static void signals_render_fragment(void *context, unsigned ticks, unsigned cpu, fb_fragment_t *fragment)
+{
+	signals_context_t	*ctxt = context;
+
+	fb_fragment_zero(fragment);
+
+	if (fragment->number >= N_SIGNALS)
+		return;
+
+	ticks >>= 2;	/* move a bit slower */
+
+	for (unsigned x = 0, y; x < fragment->width; x++) {
+		float	size = fragment->height - 1;
+
+		/* This needs to compute an offset into fragment->height,
+		 * from a 0-1 range, hence size is height - 1 to not overflow.
+		 */
+		y = size - sig_output(ctxt->signals[fragment->number], ticks + x) * size;
+
+		fb_fragment_put_pixel_checked(fragment, fragment->x + x, fragment->y + y, 0xffffffff);
+	}
+}
+
+
+rototiller_module_t	signals_module = {
+	.create_context = signals_create_context,
+	.destroy_context = signals_destroy_context,
+	.prepare_frame = signals_prepare_frame,
+	.render_fragment = signals_render_fragment,
+	.name = "signals",
+	.description = "2D Waveforms (threaded)",
+	.author = "Vito Caputo <vcaputo@pengaru.com>",
+	.license = "GPLv2",
+};
diff --git a/src/rototiller.c b/src/rototiller.c
index 48056db..191e087 100644
--- a/src/rototiller.c
+++ b/src/rototiller.c
@@ -44,6 +44,7 @@ extern rototiller_module_t	plasma_module;
 extern rototiller_module_t	ray_module;
 extern rototiller_module_t	roto_module;
 extern rototiller_module_t	rtv_module;
+extern rototiller_module_t	signals_module;
 extern rototiller_module_t	snow_module;
 extern rototiller_module_t	sparkler_module;
 extern rototiller_module_t	spiro_module;
@@ -63,6 +64,7 @@ static const rototiller_module_t	*modules[] = {
 	&ray_module,
 	&roto_module,
 	&rtv_module,
+	&signals_module,
 	&snow_module,
 	&sparkler_module,
 	&spiro_module,