diff options
Diffstat (limited to 'tunnel/src/main.cc')
| -rw-r--r-- | tunnel/src/main.cc | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/tunnel/src/main.cc b/tunnel/src/main.cc new file mode 100644 index 0000000..c050c8c --- /dev/null +++ b/tunnel/src/main.cc @@ -0,0 +1,182 @@ +/* +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 <stdio.h> +#include <stdlib.h> +#include <math.h> +#include "winnie.h" +#include "tunneltex.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; +} |