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#include <math.h>
#include "til.h"
#include "til_fb.h"
/* Copyright (C) 2023 - Vito Caputo <vcaputo@pengaru.com> */
/* This implements a rudimentary panning module primarily for overlay use,
*
* TODO:
* - the minimal default tile could be more clever
* - runtime setting for panning velocity
* - optimization
* (see comments)
*/
#define PAN_DEFAULT_Y_COMPONENT -.5
#define PAN_DEFAULT_X_COMPONENT .25
#define PAN_DEFAULT_TILE_SIZE 32
typedef struct pan_context_t {
til_module_context_t til_module_context;
til_fb_fragment_t *snapshot;
float xoffset, yoffset;
til_fb_fragment_t tile;
uint32_t tile_buf[PAN_DEFAULT_TILE_SIZE * PAN_DEFAULT_TILE_SIZE];
} pan_context_t;
typedef struct pan_setup_t {
til_setup_t til_setup;
float x, y;
} pan_setup_t;
static til_module_context_t * pan_create_context(const til_module_t *module, til_stream_t *stream, unsigned seed, unsigned ticks, unsigned n_cpus, til_setup_t *setup)
{
pan_context_t *ctxt;
ctxt = til_module_context_new(module, sizeof(pan_context_t), stream, seed, ticks, n_cpus, setup);
if (!ctxt)
return NULL;
ctxt->tile = (til_fb_fragment_t){
.buf = ctxt->tile_buf,
.frame_width = PAN_DEFAULT_TILE_SIZE,
.frame_height = PAN_DEFAULT_TILE_SIZE,
.width = PAN_DEFAULT_TILE_SIZE,
.height = PAN_DEFAULT_TILE_SIZE,
.pitch = PAN_DEFAULT_TILE_SIZE,
};
{
uint32_t color = (((uint32_t)rand_r(&seed) & 0xff) << 16) |
(((uint32_t)rand_r(&seed) & 0xff) << 8) |
((uint32_t)rand_r(&seed) & 0xff);
/* FIXME TODO: make a more interesting default pattern, still influenced by seed tho */
for (int y = 0; y < PAN_DEFAULT_TILE_SIZE; y++) {
for (int x = 0; x < PAN_DEFAULT_TILE_SIZE; x++) {
uint32_t c = (((x*y & 0xff) << 16) | ((x*y & 0xff) << 8) | (x*y & 0xff));
ctxt->tile_buf[y * PAN_DEFAULT_TILE_SIZE + x] = color ^ c;
}
}
}
return &ctxt->til_module_context;
}
static void pan_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)
{
pan_context_t *ctxt = (pan_context_t *)context;
pan_setup_t *s = (pan_setup_t *)context->setup;
til_fb_fragment_t *fragment = *fragment_ptr;
float dt = (ticks - context->last_ticks) * .1f;
til_fb_fragment_t *snapshot = &ctxt->tile;
if (fragment->cleared)
ctxt->snapshot = til_fb_fragment_snapshot(fragment_ptr, 0);
if (ctxt->snapshot)
snapshot = ctxt->snapshot;
ctxt->xoffset += dt * s->x;
ctxt->xoffset = fmodf(ctxt->xoffset, snapshot->frame_width);
ctxt->yoffset += dt * s->y;
ctxt->yoffset = fmodf(ctxt->yoffset, snapshot->frame_height);
*res_frame_plan = (til_frame_plan_t){ .fragmenter = til_fragmenter_slice_per_cpu_x16 };
}
/* like til_fb_fragment_get_pixel_clipped, but wraps around (maybe move to til_fb.h?) */
static inline uint32_t pan_get_pixel_wrapped(til_fb_fragment_t *fragment, int x, int y)
{
int xcoord, ycoord;
/* The need for such casts makes me wonder if til_fragment_t.*{width,height} should just be ints,
* which annoys me because those members should never actually be negative. But without the casts,
* the modulos do the entirely wrong thing for negative coordinates.
*/
xcoord = x % (int)fragment->frame_width;
if (xcoord < 0)
xcoord += fragment->frame_width;
ycoord = y % (int)fragment->frame_height;
if (ycoord < 0)
ycoord += fragment->frame_height;
return til_fb_fragment_get_pixel_unchecked(fragment, xcoord, ycoord);
}
static void pan_render_fragment(til_module_context_t *context, til_stream_t *stream, unsigned ticks, unsigned cpu, til_fb_fragment_t **fragment_ptr)
{
pan_context_t *ctxt = (pan_context_t *)context;
til_fb_fragment_t *fragment = *fragment_ptr;
int xoff, yoff;
til_fb_fragment_t *snapshot = ctxt->snapshot ? : &ctxt->tile;
xoff = ctxt->xoffset;
yoff = ctxt->yoffset;
for (int y = 0; y < fragment->height; y++) {
int ycoord = fragment->y + y + yoff;
for (int x = 0; x < fragment->width; x++) {
int xcoord = fragment->x + x + xoff;
uint32_t pixel;
/* TODO: optimize this to at least do contiguous row copies,
* as-is it's doing modulos per-pixel!
*/
pixel = pan_get_pixel_wrapped(snapshot, xcoord, ycoord);
til_fb_fragment_put_pixel_unchecked(fragment, 0, fragment->x + x, fragment->y + y, pixel);
}
}
*fragment_ptr = fragment;
}
static int pan_finish_frame(til_module_context_t *context, til_stream_t *stream, unsigned int ticks, til_fb_fragment_t **fragment_ptr)
{
pan_context_t *ctxt = (pan_context_t *)context;
if (ctxt->snapshot)
ctxt->snapshot = til_fb_fragment_reclaim(ctxt->snapshot);
return 0;
}
static int pan_setup(const til_settings_t *settings, til_setting_t **res_setting, const til_setting_desc_t **res_desc, til_setup_t **res_setup);
til_module_t pan_module = {
.create_context = pan_create_context,
.prepare_frame = pan_prepare_frame,
.render_fragment = pan_render_fragment,
.finish_frame = pan_finish_frame,
.setup = pan_setup,
.name = "pan",
.description = "Simple panning effect (threaded)",
.author = "Vito Caputo <vcaputo@pengaru.com>",
.flags = TIL_MODULE_OVERLAYABLE,
};
static int pan_setup(const til_settings_t *settings, til_setting_t **res_setting, const til_setting_desc_t **res_desc, til_setup_t **res_setup)
{
til_setting_t *x, *y;
const char *component_values[] = {
"-1",
"-.8",
"-.7",
"-.5",
"-.25",
"-.2",
"-.1",
"-.05",
"0",
".05",
".1",
".2",
".25",
".5",
".7",
".8",
"1",
NULL
};
int r;
r = til_settings_get_and_describe_setting(settings,
&(til_setting_spec_t){
.name = "Pan direction vector X component",
.key = "x",
.preferred = TIL_SETTINGS_STR(PAN_DEFAULT_X_COMPONENT),
.values = component_values,
.annotations = NULL
},
&x,
res_setting,
res_desc);
if (r)
return r;
r = til_settings_get_and_describe_setting(settings,
&(til_setting_spec_t){
.name = "Pan direction vector Y component",
.key = "y",
.preferred = TIL_SETTINGS_STR(PAN_DEFAULT_Y_COMPONENT),
.values = component_values,
.annotations = NULL
},
&y,
res_setting,
res_desc);
if (r)
return r;
if (res_setup) {
pan_setup_t *setup;
float l;
setup = til_setup_new(settings, sizeof(*setup), NULL, &pan_module);
if (!setup)
return -ENOMEM;
if (sscanf(x->value, "%f", &setup->x) != 1)
return til_setup_free_with_failed_setting_ret_err(&setup->til_setup, x, res_setting, -EINVAL);
if (sscanf(y->value, "%f", &setup->y) != 1)
return til_setup_free_with_failed_setting_ret_err(&setup->til_setup, y, res_setting, -EINVAL);
l = sqrtf(setup->x * setup->x + setup->y * setup->y);
if (l) {
setup->x /= l;
setup->y /= l;
}
*res_setup = &setup->til_setup;
}
return 0;
}
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