154 lines
3.2 KiB
C
154 lines
3.2 KiB
C
#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <i915_drm.h>
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#include <sys/ioctl.h>
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#include <time.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <math.h>
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#include <time.h>
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#include <cairo.h>
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#include <glib.h>
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#include "wayland-client.h"
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#include "wayland-glib.h"
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#include "cairo-util.h"
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static const char gem_device[] = "/dev/dri/card0";
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static const char socket_name[] = "\0wayland";
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static void
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set_random_color(cairo_t *cr)
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{
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cairo_set_source_rgba(cr,
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0.5 + (random() % 50) / 49.0,
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0.5 + (random() % 50) / 49.0,
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0.5 + (random() % 50) / 49.0,
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0.5 + (random() % 100) / 99.0);
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}
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static void *
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draw_stuff(int width, int height)
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{
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const int petal_count = 3 + random() % 5;
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const double r1 = 60 + random() % 35;
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const double r2 = 20 + random() % 40;
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const double u = (10 + random() % 90) / 100.0;
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const double v = (random() % 90) / 100.0;
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cairo_surface_t *surface;
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cairo_t *cr;
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int i;
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double t, dt = 2 * M_PI / (petal_count * 2);
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double x1, y1, x2, y2, x3, y3;
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surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24,
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width, height);
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cr = cairo_create(surface);
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cairo_translate(cr, width / 2, height / 2);
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cairo_move_to(cr, cos(t) * r1, sin(t) * r1);
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for (t = 0, i = 0; i < petal_count; i++, t += dt * 2) {
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x1 = cos(t) * r1;
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y1 = sin(t) * r1;
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x2 = cos(t + dt) * r2;
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y2 = sin(t + dt) * r2;
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x3 = cos(t + 2 * dt) * r1;
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y3 = sin(t + 2 * dt) * r1;
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cairo_curve_to(cr,
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x1 - y1 * u, y1 + x1 * u,
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x2 + y2 * v, y2 - x2 * v,
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x2, y2);
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cairo_curve_to(cr,
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x2 - y2 * v, y2 + x2 * v,
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x3 + y3 * u, y3 - x3 * u,
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x3, y3);
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}
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cairo_close_path(cr);
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set_random_color(cr);
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cairo_fill_preserve(cr);
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set_random_color(cr);
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cairo_stroke(cr);
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cairo_destroy(cr);
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return surface;
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}
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struct flower {
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struct wl_surface *surface;
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int i;
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int x, y, width, height;
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};
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static gboolean
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move_flower(gpointer data)
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{
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struct flower *flower = data;
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wl_surface_map(flower->surface,
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flower->x + cos(flower->i / 31.0) * 400 - flower->width / 2,
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flower->y + sin(flower->i / 27.0) * 300 - flower->height / 2,
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flower->width, flower->height);
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flower->i++;
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return TRUE;
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}
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int main(int argc, char *argv[])
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{
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struct wl_display *display;
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int fd;
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cairo_surface_t *s;
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struct timespec ts;
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GMainLoop *loop;
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GSource *source;
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struct flower flower;
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struct buffer *buffer;
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fd = open(gem_device, O_RDWR);
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if (fd < 0) {
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fprintf(stderr, "drm open failed: %m\n");
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return -1;
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}
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loop = g_main_loop_new(NULL, FALSE);
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display = wl_display_create(socket_name);
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if (display == NULL) {
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fprintf(stderr, "failed to create display: %m\n");
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return -1;
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}
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source = wayland_source_new(display);
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g_source_attach(source, NULL);
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flower.x = 512;
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flower.y = 384;
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flower.width = 200;
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flower.height = 200;
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flower.surface = wl_display_create_surface(display);
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clock_gettime(CLOCK_MONOTONIC, &ts);
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srandom(ts.tv_nsec);
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flower.i = ts.tv_nsec;
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s = draw_stuff(flower.width, flower.height);
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buffer = buffer_create_from_cairo_surface(fd, s);
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wl_surface_attach(flower.surface, buffer->name, flower.width, flower.height,
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buffer->stride);
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g_timeout_add(20, move_flower, &flower);
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g_main_loop_run(loop);
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return 0;
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}
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