137 lines
3.2 KiB
C
137 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 <fcntl.h>
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#include <unistd.h>
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#include <math.h>
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#include <cairo.h>
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#include "wayland-client.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 uint32_t name_cairo_surface(int fd, cairo_surface_t *surface)
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{
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struct drm_i915_gem_create create;
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struct drm_gem_flink flink;
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struct drm_i915_gem_pwrite pwrite;
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int32_t width, height, stride;
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width = cairo_image_surface_get_width(surface);
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height = cairo_image_surface_get_height(surface);
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stride = cairo_image_surface_get_stride(surface);
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memset(&create, 0, sizeof(create));
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create.size = height * stride;
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if (ioctl(fd, DRM_IOCTL_I915_GEM_CREATE, &create) != 0) {
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fprintf(stderr, "gem create failed: %m\n");
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return 0;
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}
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pwrite.handle = create.handle;
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pwrite.offset = 0;
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pwrite.size = height * stride;
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pwrite.data_ptr = (uint64_t) (uintptr_t)
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cairo_image_surface_get_data(surface);
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if (ioctl(fd, DRM_IOCTL_I915_GEM_PWRITE, &pwrite) < 0) {
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fprintf(stderr, "gem pwrite failed: %m\n");
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return 0;
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}
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flink.handle = create.handle;
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if (ioctl(fd, DRM_IOCTL_GEM_FLINK, &flink) != 0) {
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fprintf(stderr, "gem flink failed: %m\n");
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return 0;
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}
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#if 0
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/* We need to hold on to the handle until the server has received
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* the attach request... we probably need a confirmation event.
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* I guess the breadcrumb idea will suffice. */
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struct drm_gem_close close;
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close.handle = create.handle;
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if (ioctl(fd, DRM_IOCTL_GEM_CLOSE, &close) < 0) {
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fprintf(stderr, "gem close failed: %m\n");
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return 0;
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}
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#endif
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return flink.name;
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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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cairo_surface_t *surface;
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cairo_t *cr;
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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_arc(cr, width / 2, height / 2, width / 2 - 10, 0, 2 * M_PI);
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cairo_set_source_rgb(cr, 1, 0, 0);
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cairo_fill_preserve(cr);
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cairo_set_source_rgb(cr, 1, 1, 0);
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cairo_stroke(cr);
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cairo_arc(cr, width / 2, height / 2, width / 4 - 10, 0, 2 * M_PI);
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cairo_set_source_rgb(cr, 0, 0, 1);
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cairo_fill_preserve(cr);
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cairo_set_source_rgb(cr, 1, 1, 0);
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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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int main(int argc, char *argv[])
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{
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struct wl_connection *connection;
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struct wl_display *display;
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struct wl_surface *surface;
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const int x = 400, y = 200, width = 300, height = 300;
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int fd;
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uint32_t name;
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cairo_surface_t *s;
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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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connection = wl_connection_create(socket_name);
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if (connection == NULL) {
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fprintf(stderr, "failed to create connection: %m\n");
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return -1;
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}
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display = wl_connection_get_display(connection);
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surface = wl_display_create_surface(display);
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s = draw_stuff(width, height);
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name = name_cairo_surface(fd, s);
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wl_surface_attach(surface, name, width, height,
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cairo_image_surface_get_stride(s));
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wl_surface_map(surface, x, y, width, height);
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if (wl_connection_flush(connection) < 0) {
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fprintf(stderr, "flush error: %m\n");
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return -1;
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}
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wl_connection_iterate(connection);
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return 0;
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}
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