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/*
winnie - an experimental window system
Copyright (C) 2013 Eleni Maria Stea
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/>.
Author: Eleni Maria Stea <elene.mst@gmail.com>
*/
#include "tunneltex.h"
#include "winnie.h"
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
static void resize(int xsz, int ysz);
static void display(Window *win);
static void timer(Window *win);
static bool calc_tunnel_mapping();
static int xsz = 512;
static int ysz = 384;
static Pixmap *tex;
static float *umap, *vmap;
static unsigned long start_time;
extern "C" bool
init()
{
Window *win = new Window;
win->set_title("tunnel effect");
win->move(380, 280);
win->resize(xsz, ysz);
win->set_display_callback(display);
win->set_timer_callback(timer);
tex = new Pixmap;
tex->set_image(gimp_image.width, gimp_image.height);
for (int i = 0; i < tex->width * tex->height; i++) {
tex->pixels[i * 4] = gimp_image.pixel_data[i * 3];
tex->pixels[i * 4 + 1] = gimp_image.pixel_data[i * 3 + 1];
tex->pixels[i * 4 + 2] = gimp_image.pixel_data[i * 3 + 2];
}
resize(xsz, ysz);
wm->add_window(win);
start_time = winnie_get_time();
set_window_timer(win, 25, TIMER_REPEAT);
return true;
}
extern "C" void
cleanup()
{
delete tex;
}
static void
resize(int width, int height)
{
xsz = width;
ysz = height;
calc_tunnel_mapping();
}
static void
display(Window *win)
{
Pixmap *fb = get_framebuffer_pixmap();
Rect wrect = win->get_absolute_rect();
if (wrect.width != xsz || wrect.height != ysz) {
resize(wrect.width, wrect.height);
}
unsigned long msec = winnie_get_time() - start_time;
float sec = (float) msec / 1000.0f;
float uoffs = sec * 0.75;
float voffs = sec;
unsigned char *fbptr = fb->pixels + (wrect.y * fb->width + wrect.x) * 4;
float *uptr = umap;
float *vptr = vmap;
for (int i = 0; i < ysz; i++) {
for (int j = 0; j < xsz; j++) {
float u = *uptr++ * 8.0f;
float v = *vptr++;
// unsigned long tx = ((((unsigned long)((u << 3) - uoffs)) & 0xff) *
// tex->width) >> 8; unsigned long tx = ((((u << 3) * tex->width) >> 8) +
// uoffs) % tex->width; unsigned long ty = (((unsigned long)(v + voffs *
// 2) & 0xff) * tex->height) >> 8;
int tx = fmod(u - uoffs, 1.0f) * tex->width;
if (tx < 0) {
tx += tex->width;
}
int ty = fmod(v + voffs, 1.0f) * tex->height;
float fog = 1.0f - v / 8.0f;
if (fog < 0.0f)
fog = 0.0f;
if (fog > 1.0f)
fog = 1.0f;
unsigned char red, green, blue;
if (i == ysz / 2 && j == xsz / 2) {
red = green = blue = 0;
} else {
int offs = (ty * tex->width + tx) * 4;
red = tex->pixels[offs];
green = tex->pixels[offs + 1];
blue = tex->pixels[offs + 2];
}
red = red * fog;
green = green * fog;
blue = blue * fog;
fbptr[j * 4] = red;
fbptr[j * 4 + 1] = green;
fbptr[j * 4 + 2] = blue;
}
fbptr += fb->width * 4;
}
}
static void
timer(Window *win)
{
wm->invalidate_region(win->get_absolute_rect());
}
static bool
calc_tunnel_mapping()
{
int i, j;
float *uptr, *vptr;
if (umap || vmap) {
free(umap);
free(vmap);
}
if (!(umap = (float *) malloc(xsz * ysz * sizeof *umap))) {
return false;
}
if (!(vmap = (float *) malloc(xsz * ysz * sizeof *umap))) {
free(umap);
return false;
}
uptr = umap;
vptr = vmap;
for (i = 0; i < ysz; i++) {
for (j = 0; j < xsz; j++) {
float x = ((float) j / xsz * 2.0 - 1.0) * 1.33333;
float y = (float) i / ysz * 2.0 - 1.0;
float angle, z, dist;
if (fabs(x) > 0.00001) {
angle = atan2(y, x) + M_PI;
} else {
angle = y < 0.0 ? M_PI / 2.0 : 3.0 * M_PI / 2.0;
}
dist = sqrt(x * x + y * y);
z = 2.0 / dist;
*uptr++ = angle * 0.5 / M_PI;
*vptr++ = z;
}
}
return true;
}
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