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weston/flower.c

202 lines
4.5 KiB

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <i915_drm.h>
#include <sys/ioctl.h>
#include <sys/poll.h>
#include <fcntl.h>
#include <unistd.h>
#include <math.h>
#include <time.h>
#include <cairo.h>
#include "wayland-client.h"
static const char gem_device[] = "/dev/dri/card0";
static const char socket_name[] = "\0wayland";
static uint32_t name_cairo_surface(int fd, cairo_surface_t *surface)
{
struct drm_i915_gem_create create;
struct drm_gem_flink flink;
struct drm_i915_gem_pwrite pwrite;
int32_t width, height, stride;
width = cairo_image_surface_get_width(surface);
height = cairo_image_surface_get_height(surface);
stride = cairo_image_surface_get_stride(surface);
memset(&create, 0, sizeof(create));
create.size = height * stride;
if (ioctl(fd, DRM_IOCTL_I915_GEM_CREATE, &create) != 0) {
fprintf(stderr, "gem create failed: %m\n");
return 0;
}
pwrite.handle = create.handle;
pwrite.offset = 0;
pwrite.size = height * stride;
pwrite.data_ptr = (uint64_t) (uintptr_t)
cairo_image_surface_get_data(surface);
if (ioctl(fd, DRM_IOCTL_I915_GEM_PWRITE, &pwrite) < 0) {
fprintf(stderr, "gem pwrite failed: %m\n");
return 0;
}
flink.handle = create.handle;
if (ioctl(fd, DRM_IOCTL_GEM_FLINK, &flink) != 0) {
fprintf(stderr, "gem flink failed: %m\n");
return 0;
}
#if 0
/* We need to hold on to the handle until the server has received
* the attach request... we probably need a confirmation event.
* I guess the breadcrumb idea will suffice. */
struct drm_gem_close close;
close.handle = create.handle;
if (ioctl(fd, DRM_IOCTL_GEM_CLOSE, &close) < 0) {
fprintf(stderr, "gem close failed: %m\n");
return 0;
}
#endif
return flink.name;
}
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(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_surface_t *surface;
cairo_t *cr;
int i;
double t, dt = 2 * M_PI / (petal_count * 2);
double x1, y1, x2, y2, x3, y3;
surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24,
width, height);
cr = cairo_create(surface);
cairo_translate(cr, width / 2, height / 2);
cairo_move_to(cr, cos(t) * r1, sin(t) * 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);
return surface;
}
static int
connection_update(struct wl_connection *connection,
uint32_t mask, void *data)
{
struct pollfd *p = data;
p->events = 0;
if (mask & WL_CONNECTION_READABLE)
p->events |= POLLIN;
if (mask & WL_CONNECTION_WRITABLE)
p->events |= POLLOUT;
return 0;
}
int main(int argc, char *argv[])
{
struct wl_display *display;
struct wl_surface *surface;
const int x = 200, y = 200, width = 200, height = 200;
int fd, i, ret;
uint32_t name, mask;
cairo_surface_t *s;
struct pollfd p[1];
srandom(time(NULL));
fd = open(gem_device, O_RDWR);
if (fd < 0) {
fprintf(stderr, "drm open failed: %m\n");
return -1;
}
display = wl_display_create(socket_name,
connection_update, &p[0]);
if (display == NULL) {
fprintf(stderr, "failed to create display: %m\n");
return -1;
}
p[0].fd = wl_display_get_fd(display);
surface = wl_display_create_surface(display);
s = draw_stuff(width, height);
name = name_cairo_surface(fd, s);
wl_surface_attach(surface, name, width, height,
cairo_image_surface_get_stride(s));
i = 0;
while (ret = poll(p, 1, 20), ret >= 0) {
if (ret == 0) {
wl_surface_map(surface,
x + cos(i / 30.0) * 200,
y + sin(i / 31.0) * 200,
width, height);
i++;
continue;
}
mask = 0;
if (p[0].revents & POLLIN)
mask |= WL_CONNECTION_READABLE;
if (p[0].revents & POLLOUT)
mask |= WL_CONNECTION_WRITABLE;
if (mask)
wl_display_iterate(display, mask);
}
return 0;
}