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palette.c
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palette.c
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/*
Copyright (C) 2018 Jacek Danecki <[email protected]>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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 "fractal_ocl.h"
#include "gui.h"
#include "parameters.h"
#include <math.h>
#include <stdlib.h>
unsigned int* colors;
#define MAX(a, b) (a > b) ? a : b
#define MIN(a, b) (a < b) ? a : b
void rgb2hsv(int r, int g, int b, int* h, int* s, int* v)
{
float r1, g1, b1, h1, s1, v1;
float cmax, cmin;
float t, delta;
r1 = r / 255.0;
g1 = g / 255.0;
b1 = b / 255.0;
t = MAX(r1, g1);
if (t > b1)
cmax = t;
else
cmax = b1;
t = MIN(r1, g1);
if (t < b1)
cmin = t;
else
cmin = b1;
v1 = cmax;
delta = cmax - cmin;
if (delta != 0)
{
s1 = delta / cmax;
}
else
s1 = 0.0;
if (s1 == 0)
{
h1 = 0.0;
}
else
{
if (r1 == cmax)
{
h1 = (g1 - b1) / delta;
}
else
{
if (g1 == cmax)
{
h1 = 2.0 + (b1 - r1) / delta;
}
else
{
if (b1 == cmax)
{
h1 = 4.0 + (r1 - g1) / delta;
}
}
}
}
*h = (int)roundf(60.0 * h1);
*s = (int)roundf(100 * s1);
*v = (int)roundf(100 * v1);
}
void hsv2rgb(int h, int s, int v, int* r, int* g, int* b)
{
// h [0..360]
// s [0..100]
// v [1..100]
float r1, g1, b1, i, f, p, q, t, h1, s1, v1;
s1 = s / 100.0;
v1 = v / 100.0;
if (!s && !h)
{
*r = 255 * v1;
*g = 255 * v1;
*b = 255 * v1;
return;
}
if (h == 360) h1 = 0.0;
h1 = h / 60.0;
i = floor(h1);
f = h1 - i;
p = v1 * (1.0 - s1);
q = v1 * (1.0 - s1 * f);
t = v1 * (1.0 - (s1 * (1.0 - f)));
switch ((int)i)
{
case 0:
r1 = v1;
g1 = t;
b1 = p;
break;
case 1:
r1 = q;
g1 = v1;
b1 = p;
break;
case 2:
r1 = p;
g1 = v1;
b1 = t;
break;
case 3:
r1 = p;
g1 = q;
b1 = v1;
break;
case 4:
r1 = t;
g1 = p;
b1 = v1;
break;
case 5:
r1 = v1;
g1 = p;
b1 = q;
break;
}
*r = roundf(255 * r1);
*g = roundf(255 * g1);
*b = roundf(255 * b1);
}
int initialize_colors()
{
int err, iter;
#ifdef OPENCL_SUPPORT
int d;
#endif
// h [0..359]
// s [1]
// v [0, 1]
err = posix_memalign((void**)&colors, 4096, 4096);
if (err) return 1;
for (iter = 0; iter < 360; iter++)
{
float h1 = iter / 60.0;
float v1 = 1.0;
int r, g, b;
float r1, g1, b1, i, f, p, q, t;
i = floor(h1);
f = h1 - i;
p = 0;
q = v1 * (1.0 - f);
t = v1 * (1.0 - (1.0 - f));
switch ((int)i)
{
case 0:
r1 = v1;
g1 = t;
b1 = p;
break;
case 1:
r1 = q;
g1 = v1;
b1 = p;
break;
case 2:
r1 = p;
g1 = v1;
b1 = t;
break;
case 3:
r1 = p;
g1 = q;
b1 = v1;
break;
case 4:
r1 = t;
g1 = p;
b1 = v1;
break;
case 5:
r1 = v1;
g1 = p;
b1 = q;
break;
}
// printf("v=%d i=%d r=%f g=%f b=%f\n", v, iter, r1, g1, b1);
r = roundf(255.0 * r1);
r &= 0xff;
g = roundf(255.0 * g1);
g &= 0xff;
b = roundf(255.0 * b1);
b &= 0xff;
unsigned int c = 0xff000000 | r << 16 | g << 8 | b;
colors[iter] = c;
colors[359 * 2 - iter] = c;
}
colors[0] = 0;
colors[360] = (colors[359] + colors[361]) / 2;
#ifdef OPENCL_SUPPORT
for (d = 0; d < nr_devices; d++)
{
if (prepare_colors(&ocl_devices[d])) return 1;
if (prepare_pixels(&ocl_devices[d])) return 1;
if (prepare_thread(&ocl_devices[d])) return 1;
}
#endif
return 0;
}
unsigned int get_color(int c) { return colors[c % 360]; }
void show_hsv_palette()
{
int x;
SDL_Rect dst;
dst.w = WIDTH;
dst.x = 0;
dst.y = 0;
dst.h = HEIGHT;
SDL_SetRenderDrawColor(main_window, 0, 0, 0, 255);
SDL_RenderFillRect(main_window, &dst);
for (x = 0; x < WIDTH; x++)
{
unsigned int c = get_color(x);
int r = (c & 0xff0000) >> 16;
int g = (c & 0x00ff00) >> 8;
int b = c & 0xff;
SDL_SetRenderDrawColor(main_window, r, g, b, 255);
SDL_RenderDrawLine(main_window, x, 0, x, HEIGHT / 2);
c |= rgb;
r = (c & 0xff0000) >> 16;
g = (c & 0x00ff00) >> 8;
b = c & 0xff;
SDL_SetRenderDrawColor(main_window, r, g, b, 255);
SDL_RenderDrawLine(main_window, x, HEIGHT / 2, x, HEIGHT - 40);
}
}
void show_rgb_palette1()
{
unsigned char* pixels;
int pitch, x, y;
int nx, ny;
SDL_Rect window_rec;
SDL_LockTexture(texture, NULL, (void**)&pixels, &pitch);
window_rec.w = WIDTH;
window_rec.h = HEIGHT;
window_rec.x = 0;
window_rec.y = 0;
memset(pixels, 0, pitch * HEIGHT);
for (y = -255; y < 256; y++)
{
for (x = -255; x < 256; x++)
{
int r = sqrt(x * x + y * y);
if (r < 256)
{
r = (255 - r) * mm;
nx = (256 + x) << 2;
ny = pitch * (256 + y);
pixels[ny + nx + 2] |= (r | (rgb & 255));
pixels[ny + nx + 3] = 255;
nx = (384 + x) << 2;
ny = pitch * (256 + y);
pixels[ny + nx + 1] |= (r | ((rgb & 0x00ff00) >> 8));
pixels[ny + nx + 3] = 255;
nx = (320 + x) << 2;
ny = pitch * (384 + y);
pixels[ny + nx] |= (r | ((rgb & 0xff0000) >> 16));
pixels[ny + nx + 3] = 255;
}
}
}
SDL_UnlockTexture(texture);
SDL_RenderCopy(main_window, texture, NULL, &window_rec);
}
void show_rgb_palette2()
{
unsigned char* pixels;
int pitch, x, y;
int nx, ny;
SDL_Rect window_rec;
SDL_LockTexture(texture, NULL, (void**)&pixels, &pitch);
window_rec.w = WIDTH;
window_rec.h = HEIGHT;
window_rec.x = 0;
window_rec.y = 0;
memset(pixels, 0, pitch * HEIGHT);
for (y = -255; y < 256; y++)
{
for (x = -255; x < 256; x++)
{
unsigned int r = sqrt(x * x + y * y);
if (r < 256)
{
float cf;
r = 255 - r;
cf = 1.0 * r / 255.0;
r = 255 * (c1[2] + c2[2] * cos(6.2830 * (c3[2] * cf + c4[2])));
nx = (256 + x) << 2;
ny = pitch * (256 + y);
pixels[ny + nx + 2] |= r;
pixels[ny + nx + 3] = 255;
r = 255 * (c1[1] + c2[1] * cos(6.2830 * (c3[1] * cf + c4[1])));
nx = (384 + x) << 2;
ny = pitch * (256 + y);
pixels[ny + nx + 1] |= r;
pixels[ny + nx + 3] = 255;
r = 255 * (c1[0] + c2[0] * cos(6.2830 * (c3[0] * cf + c4[0])));
nx = (320 + x) << 2;
ny = pitch * (384 + y);
pixels[ny + nx] |= r;
pixels[ny + nx + 3] = 255;
}
}
}
SDL_UnlockTexture(texture);
SDL_RenderCopy(main_window, texture, NULL, &window_rec);
}
void show_palette()
{
switch (pal)
{
case 0: // HSV
show_hsv_palette();
break;
case 1: // RGB
show_rgb_palette1();
break;
case 2: // RGB
show_rgb_palette2();
break;
}
SDL_RenderPresent(main_window);
}
void make_postprocess(void* px1)
{
int i;
unsigned int* src = px1;
unsigned int* dst = texture_pixels;
int s = IMAGE_SIZE / 4;
for (i = 0; i < s; i++)
{
unsigned char r = 255.0 * src[i] / max_iter;
unsigned char g = 128 + 127 * sin(src[i]);
unsigned char b = 128 + 127 * cos(src[i]);
dst[i] = 0xff000000 | r << 16 | g << 8 | b;
}
}