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#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;
void *data;
width = cairo_image_surface_get_width(surface);
height = cairo_image_surface_get_height(surface);
stride = cairo_image_surface_get_stride(surface);
data = cairo_image_surface_get_data(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) data;
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 *
draw_pointer(int width, int height)
{
const int d = 2, end = 4, tx = 2, ty = 6, dx = 4, dy = 4;
cairo_surface_t *surface;
cairo_t *cr;
surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24,
width, height);
cr = cairo_create(surface);
cairo_set_line_width (cr, d);
cairo_move_to(cr, d, d);
cairo_line_to(cr, d + tx, d + ty);
cairo_line_to(cr, d + dx, d + dy);
cairo_line_to(cr, width - end, height - d);
cairo_line_to(cr, width - d, height - end);
cairo_line_to(cr, d + dy, d + dx);
cairo_line_to(cr, d + ty, d + tx);
cairo_close_path(cr);
cairo_set_source_rgb(cr, 1, 1, 1);
cairo_stroke_preserve(cr);
cairo_set_source_rgb(cr, 1, 0, 0);
cairo_fill(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;
}
struct pointer {
int width, height;
struct wl_surface *surface;
};
void event_handler(struct wl_display *display,
uint32_t opcode,
uint32_t arg1, uint32_t arg2, void *data)
{
struct pointer *pointer = data;
if (opcode == 0)
wl_surface_map(pointer->surface, arg1, arg2, pointer->width, pointer->height);
}
int main(int argc, char *argv[])
{
struct wl_display *display;
struct pointer pointer;
int fd;
uint32_t name, mask;
cairo_surface_t *s;
struct pollfd p[1];
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);
pointer.width = 16;
pointer.height = 16;
pointer.surface = wl_display_create_surface(display);
s = draw_pointer(pointer.width, pointer.height);
name = name_cairo_surface(fd, s);
wl_surface_attach(pointer.surface, name,
pointer.width, pointer.height,
cairo_image_surface_get_stride(s));
wl_surface_map(pointer.surface, 512, 384, pointer.width, pointer.height);
wl_display_set_event_handler(display, event_handler, &pointer);
while (1) {
poll(p, 1, -1);
mask = 0;
if (p[0].revents & POLLIN)
mask |= WL_CONNECTION_READABLE;
if (p[0].revents & POLLOUT)
mask |= WL_CONNECTION_WRITABLE;
wl_display_iterate(display, mask);
}
return 0;
}
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