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/*
* Copyright © 2008 Kristian Høgsberg
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <fcntl.h>
#include <unistd.h>
#include <math.h>
#include <time.h>
#include <cairo.h>
#include <glib.h>
#include <cairo-drm.h>
#include "wayland-client.h"
#include "wayland-glib.h"
static const char gem_device[] = "/dev/dri/card0";
static const char socket_name[] = "\0wayland";
static void
set_random_color(cairo_t *cr)
{
cairo_set_source_rgba(cr,
0.5 + (random() % 50) / 49.0,
0.5 + (random() % 50) / 49.0,
0.5 + (random() % 50) / 49.0,
0.5 + (random() % 100) / 99.0);
}
static void
draw_stuff(cairo_surface_t *surface, int width, int height)
{
const int petal_count = 3 + random() % 5;
const double r1 = 60 + random() % 35;
const double r2 = 20 + random() % 40;
const double u = (10 + random() % 90) / 100.0;
const double v = (random() % 90) / 100.0;
cairo_t *cr;
int i;
double t, dt = 2 * M_PI / (petal_count * 2);
double x1, y1, x2, y2, x3, y3;
cr = cairo_create(surface);
cairo_translate(cr, width / 2, height / 2);
cairo_move_to(cr, cos(0) * r1, sin(0) * r1);
for (t = 0, i = 0; i < petal_count; i++, t += dt * 2) {
x1 = cos(t) * r1;
y1 = sin(t) * r1;
x2 = cos(t + dt) * r2;
y2 = sin(t + dt) * r2;
x3 = cos(t + 2 * dt) * r1;
y3 = sin(t + 2 * dt) * r1;
cairo_curve_to(cr,
x1 - y1 * u, y1 + x1 * u,
x2 + y2 * v, y2 - x2 * v,
x2, y2);
cairo_curve_to(cr,
x2 - y2 * v, y2 + x2 * v,
x3 + y3 * u, y3 - x3 * u,
x3, y3);
}
cairo_close_path(cr);
set_random_color(cr);
cairo_fill_preserve(cr);
set_random_color(cr);
cairo_stroke(cr);
cairo_destroy(cr);
}
struct flower {
struct wl_compositor *compositor;
struct wl_surface *surface;
int x, y, width, height;
int offset;
};
static void
handle_acknowledge(void *data,
struct wl_compositor *compositor,
uint32_t key, uint32_t frame)
{
}
static void
handle_frame(void *data,
struct wl_compositor *compositor,
uint32_t frame, uint32_t timestamp)
{
struct flower *flower = data;
wl_surface_map(flower->surface,
flower->x + cos((flower->offset + timestamp) / 400.0) * 400 - flower->width / 2,
flower->y + sin((flower->offset + timestamp) / 320.0) * 300 - flower->height / 2,
flower->width, flower->height);
wl_compositor_commit(flower->compositor, 0);
}
static const struct wl_compositor_listener compositor_listener = {
handle_acknowledge,
handle_frame,
};
int main(int argc, char *argv[])
{
struct wl_display *display;
struct wl_visual *visual;
int fd;
cairo_device_t *device;
cairo_surface_t *s;
struct timespec ts;
GMainLoop *loop;
GSource *source;
struct flower flower;
fd = open(gem_device, O_RDWR);
if (fd < 0) {
fprintf(stderr, "drm open failed: %m\n");
return -1;
}
loop = g_main_loop_new(NULL, FALSE);
display = wl_display_create(socket_name, sizeof socket_name);
if (display == NULL) {
fprintf(stderr, "failed to create display: %m\n");
return -1;
}
source = wl_glib_source_new(display);
g_source_attach(source, NULL);
/* Process connection events. */
wl_display_iterate(display, WL_DISPLAY_READABLE);
flower.compositor = wl_display_get_compositor(display);
flower.x = 512;
flower.y = 384;
flower.width = 200;
flower.height = 200;
flower.surface = wl_compositor_create_surface(flower.compositor);
clock_gettime(CLOCK_MONOTONIC, &ts);
srandom(ts.tv_nsec);
flower.offset = random();
device = cairo_drm_device_get_for_fd(fd);
s = cairo_drm_surface_create(device,
CAIRO_CONTENT_COLOR_ALPHA,
flower.width, flower.height);
draw_stuff(s, flower.width, flower.height);
visual = wl_display_get_premultiplied_argb_visual(display);
wl_surface_attach(flower.surface,
cairo_drm_surface_get_name(s),
flower.width, flower.height,
cairo_drm_surface_get_stride(s),
visual);
wl_compositor_add_listener(flower.compositor,
&compositor_listener, &flower);
wl_compositor_commit(flower.compositor, 0);
g_main_loop_run(loop);
return 0;
}
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