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#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,
};
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