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xcb_colormaps.c
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xcb_colormaps.c
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/*
* Copyright (C) 2014 Tomasz Kramkowski <tk@the-tk.com>
*
* This program is free software. It is licensed under version 3 of the
* GNU General Public License.
*
* 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 <stdlib.h>
#include <stdio.h>
#include <xcb/xcb.h>
#include <xcb/xcb_image.h>
#include <xif.h>
#include <time.h>
#define WIDTH 640
#define HEIGHT 480
void perlin(uint8_t * const, uint16_t, uint16_t);
int main(int arg, char **argv)
{
srand(time(NULL));
xcb_connection_t *connection = xcb_connect(NULL, NULL);
xcb_screen_t *screen = xcb_setup_roots_iterator(xcb_get_setup(connection)).data;
xcb_colormap_t colormap = screen->default_colormap;
xcb_drawable_t window = xcb_generate_id(connection);
uint32_t mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
uint32_t values[] = {screen->black_pixel, XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_BUTTON_PRESS};
xcb_create_window(connection,
/*screen->root_depth,*/
24,
window,
screen->root,
0, 0,
WIDTH, HEIGHT,
1,
XCB_WINDOW_CLASS_INPUT_OUTPUT,
screen->root_visual,
mask, values);
xcb_pixmap_t pixmap = xcb_generate_id(connection);
xcb_create_pixmap(connection,
24,
pixmap,
window,
WIDTH, HEIGHT);
uint8_t *img = malloc(WIDTH * HEIGHT * 4);
uint8_t *limg = img;
/*for (int y = 0; y < HEIGHT; y++)*/
/*for (int x = 0; x < WIDTH; x++) {*/
/**(limg++) = 128;*/
/**(limg++) = 128;*/
/**(limg++) = 128;*/
/*limg++;*/
/*}*/
perlin(img, WIDTH, HEIGHT);
xcb_image_t *image = xcb_image_create(WIDTH, HEIGHT,
XCB_IMAGE_FORMAT_Z_PIXMAP,
8, 24, 32,
0,
/*xcb_get_setup(connection)->image_byte_order,*/
XCB_IMAGE_ORDER_MSB_FIRST,
XCB_IMAGE_ORDER_LSB_FIRST,
img,
WIDTH * HEIGHT * 4,
img);
xcb_gcontext_t gc = xcb_generate_id(connection);
xcb_create_gc(connection,
gc,
pixmap,
0, NULL);
xcb_image_put(connection, pixmap, gc, image, 0, 0, 0);
xif_write(image, "test.xif");
xcb_map_window(connection, window);
xcb_flush(connection);
xcb_generic_event_t *event;
xcb_expose_event_t *expose;
while ((event = xcb_wait_for_event(connection))) {
switch (event->response_type & ~0x80) {
case XCB_EXPOSE:
expose = (xcb_expose_event_t *)event;
xcb_copy_area(connection,
pixmap,
window,
gc,
expose->x, expose->y,
expose->x, expose->y,
expose->width, expose->height);
xcb_flush(connection);
break;
case XCB_BUTTON_PRESS:
goto end;
break;
default:
break;
}
free(event);
}
end:
xcb_free_pixmap(connection, pixmap);
xcb_disconnect(connection);
xcb_image_destroy(image);
return 0;
}
int8_t randrange(int8_t from, int8_t to)
{
int base_random = rand();
if (RAND_MAX == base_random) return randrange(from, to);
int range = to - from,
remainder = RAND_MAX % range,
bucket = RAND_MAX / range;
if (base_random < RAND_MAX - remainder) {
return from + base_random/bucket;
} else {
return randrange(from, to);
}
}
#define lerp(t, a, b) (a + t * (b - a))
void perlin(uint8_t * const img, uint16_t width, uint16_t height)
{
uint8_t *limg = img;
for (int y = 0; y < HEIGHT; y++)
for (int x = 0; x < WIDTH; x++) {
*(limg++) = 128;
*(limg++) = 128;
*(limg++) = 128;
limg++;
}
int8_t *mipmap = malloc(sizeof(int8_t) * (2 * 2 + 4 * 4 + 8 * 8 + 16 * 16) * 4);
int8_t *lmipmap = mipmap;
for (int s = 2; s <= 16; s*=2)
for (int x = 0; x < s * s; x++) {
*(lmipmap++) = randrange(-128 / s, 128 / s);
*(lmipmap++) = randrange(-128 / s, 128 / s);
*(lmipmap++) = randrange(-128 / s, 128 / s);
lmipmap++;
printf("S: %d X: %d Y: %d R: %d G: %d B: %d\n", s, x / s, x, *(lmipmap-4), *(lmipmap-3), *(lmipmap-2));
};
limg = img;
lmipmap = mipmap;
for (int y = 0; y < height; y++)
for (int x = 0; x < width; x++)
for (int bit = 0; bit < 2; bit ++) {
for (int s = 2; s <= 16; s*=2) {
size_t offset = 0;
for (int i = s / 2; i >= 2; i/=2)
offset += i * i;
lmipmap = mipmap + offset;
uint16_t xblock = width / (s - 1);
uint16_t yblock = height / (s - 1);
uint8_t xbpos = (float)x / (float)xblock;
uint8_t ybpos = (float)y / (float)yblock;
float xmul = (float)x / (float)width - (float)xbpos;
float ymul = (float)y / (float)height - (float)ybpos;
int8_t valtl, valtr, valbl, valbr;
valtl = lmipmap[bit + 4 * (ybpos * s + xbpos)];
valtr = lmipmap[bit + 4 * (ybpos * s + xbpos + 1)];
valbl = lmipmap[bit + 4 * ((ybpos + 1) * s + xbpos)];
valbr = lmipmap[bit + 4 * ((ybpos + 1) * s + xbpos + 1)];
int8_t wlerpu = lerp(xmul, valtl, valtr);
int8_t wlerpl = lerp(xmul, valbl, valbr);
int8_t endval = lerp(ymul, wlerpl, wlerpu);
limg[bit + 4 * (y * width + x)] = limg[bit + 4 * (y * width + x)] + endval;
}
}
free(mipmap);
}