diff options
Diffstat (limited to 'src/modules/signals')
| -rw-r--r-- | src/modules/signals/Makefile.am | 3 | ||||
| -rw-r--r-- | src/modules/signals/signals.c | 199 |
2 files changed, 202 insertions, 0 deletions
diff --git a/src/modules/signals/Makefile.am b/src/modules/signals/Makefile.am new file mode 100644 index 0000000..0bfe4df --- /dev/null +++ b/src/modules/signals/Makefile.am @@ -0,0 +1,3 @@ +noinst_LTLIBRARIES = libsignals.la +libsignals_la_SOURCES = signals.c +libsignals_la_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..c56c6f8 --- /dev/null +++ b/src/modules/signals/signals.c @@ -0,0 +1,199 @@ +#include <stdint.h> +#include <stdlib.h> + +#include "til.h" +#include "til_fb.h" +#include "til_module_context.h" + +#include "sig/sig.h" + +/* Copyright (C) 2020-2022 - Vito Caputo <vcaputo@pengaru.com> */ + +/* 2D waveform drawings to exercise libs/sig and explore its ergonomics */ + +/* TODO: a tileable mode would be neat, where the start and end + * heights always match up for the lines... + * + * TODO: a connected-lines version would be neat as well + * + * TODO: exposing taps for influencing the signals could be fun + * too, as well as making N_SIGNALS a runtime setting. + */ + +#define N_SIGNALS 11 + +typedef struct signals_context_t { + til_module_context_t til_module_context; + sig_sig_t *signals[N_SIGNALS]; +} signals_context_t; + + +static til_module_context_t * signals_create_context(const til_module_t *module, til_stream_t *stream, unsigned seed, unsigned ticks, unsigned n_cpus, til_setup_t *setup) +{ + signals_context_t *ctxt; + + ctxt = til_module_context_new(module, sizeof(signals_context_t), stream, seed, ticks, n_cpus, setup); + 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->til_module_context; + +err: + for (unsigned i = 0; i < N_SIGNALS; i++) + sig_free(ctxt->signals[i]); + + free(ctxt); + + return NULL; +} + + +static void signals_destroy_context(til_module_context_t *context) +{ + signals_context_t *ctxt = (signals_context_t *)context; + + for (unsigned i = 0; i < N_SIGNALS; i++) + sig_free(ctxt->signals[i]); + + free(ctxt); +} + + +static int signals_fragmenter(til_module_context_t *context, const til_fb_fragment_t *fragment, unsigned number, til_fb_fragment_t *res_fragment) +{ + return til_fb_fragment_slice_single(fragment, N_SIGNALS, number, res_fragment); +} + + +static void signals_prepare_frame(til_module_context_t *context, til_stream_t *stream, unsigned ticks, til_fb_fragment_t **fragment_ptr, til_frame_plan_t *res_frame_plan) +{ + *res_frame_plan = (til_frame_plan_t){ .fragmenter = signals_fragmenter }; +} + + +static void signals_render_fragment(til_module_context_t *context, til_stream_t *stream, unsigned ticks, unsigned cpu, til_fb_fragment_t **fragment_ptr) +{ + signals_context_t *ctxt = (signals_context_t *)context; + til_fb_fragment_t *fragment = *fragment_ptr; + + til_fb_fragment_clear(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; + + til_fb_fragment_put_pixel_checked(fragment, TIL_FB_DRAW_FLAG_TEXTURABLE, fragment->x + x, fragment->y + y, 0xffffffff); + } +} + + +til_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>", + .flags = TIL_MODULE_OVERLAYABLE | TIL_MODULE_EXPERIMENTAL, +}; |