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/*
* Copyright (C) 2019 - Vito Caputo - <vcaputo@pengaru.com>
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include "til.h"
#include "til_fb.h"
#include "til_util.h"
#include "din/din.h"
typedef struct swab_context_t {
din_t *din;
float r;
unsigned n_cpus;
} swab_context_t;
typedef struct color_t {
float r,g,b;
} color_t;
typedef struct v3f_t {
float x, y, z;
} v3f_t;
/* convert a color into a packed, 32-bit rgb pixel value (taken from libs/ray/ray_color.h) */
static inline uint32_t color_to_uint32(color_t color) {
uint32_t pixel;
if (color.r > 1.0f) color.r = 1.0f;
if (color.g > 1.0f) color.g = 1.0f;
if (color.b > 1.0f) color.b = 1.0f;
if (color.r < .0f) color.r = .0f;
if (color.g < .0f) color.g = .0f;
if (color.b < .0f) color.b = .0f;
pixel = (uint32_t)(color.r * 255.0f);
pixel <<= 8;
pixel |= (uint32_t)(color.g * 255.0f);
pixel <<= 8;
pixel |= (uint32_t)(color.b * 255.0f);
return pixel;
}
static void * swab_create_context(unsigned ticks, unsigned num_cpus)
{
swab_context_t *ctxt;
ctxt = calloc(1, sizeof(swab_context_t));
if (!ctxt)
return NULL;
ctxt->din = din_new(12, 12, 100);
if (!ctxt->din) {
free(ctxt);
return NULL;
}
return ctxt;
}
static void swab_destroy_context(void *context)
{
swab_context_t *ctxt = context;
din_free(ctxt->din);
free(ctxt);
}
static int swab_fragmenter(void *context, const til_fb_fragment_t *fragment, unsigned number, til_fb_fragment_t *res_fragment)
{
swab_context_t *ctxt = context;
return til_fb_fragment_slice_single(fragment, ctxt->n_cpus, number, res_fragment);
}
static void swab_prepare_frame(void *context, unsigned ticks, unsigned n_cpus, til_fb_fragment_t *fragment, til_fragmenter_t *res_fragmenter)
{
swab_context_t *ctxt = context;
*res_fragmenter = swab_fragmenter;
ctxt->r += .0001f;
ctxt->n_cpus = n_cpus;
}
static void swab_render_fragment(void *context, unsigned ticks, unsigned cpu, til_fb_fragment_t *fragment)
{
swab_context_t *ctxt = context;
float cos_r = cos(ctxt->r);
float sin_r = sin(ctxt->r);
float z1 = cos_r;
float z2 = sin_r;
float xscale = 1.f / (float)fragment->frame_width;
float yscale = 1.f / (float)fragment->frame_height;
for (int y = fragment->y; y < fragment->y + fragment->height; y++) {
for (int x = fragment->x; x < fragment->x + fragment->width; x++) {
color_t color;
uint32_t pixel;
float t;
t = din(ctxt->din, &(v3f_t){ .x = (float)x * xscale * .5f, .y = (float)y * yscale * .5f, .z = -z2 }) * 33.f;
color.r = din(ctxt->din, &(v3f_t){ .x = (float)x * xscale * .7f, .y = (float)y * yscale * .7f, .z = z1 }) * t;
color.g = din(ctxt->din, &(v3f_t){ .x = (float)x * xscale * .93f, .y = (float)y * yscale * .93f, .z = -z1 }) * t;
color.b = din(ctxt->din, &(v3f_t){ .x = (float)x * xscale * .81f, .y = (float)y * yscale * .81f, .z = z2 }) * t;
pixel = color_to_uint32(color);
til_fb_fragment_put_pixel_unchecked(fragment, x, y, pixel);
}
}
}
til_module_t swab_module = {
.create_context = swab_create_context,
.destroy_context = swab_destroy_context,
.prepare_frame = swab_prepare_frame,
.render_fragment = swab_render_fragment,
.name = "swab",
.description = "Colorful perlin-noise visualization (threaded)",
.author = "Vito Caputo <vcaputo@pengaru.com>",
};
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