clients: Add simple-dmabuf-egl

Add a client that uses EGL/GLESv2 to draw to dmabuf buffers, utilizing EGLImages and FBOs. The client uses GBM to create the dmabufs buffers. The simple-dmabuf-egl client is partly based on patch [1] that changes dmabuf clients to use GBM instead of libdrm code, but has been greatly simplified since in this case we don't require direct pixel access or non-RGBA formats. [1] https://patchwork.freedesktop.org/patch/239796/ Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
6 years ago · b100668426
parent a0d9cc64f6
commit b100668426
4 changed files with 894 additions and 0 deletions
--- a/Makefile.am
+++ b/Makefile.am
@ -680,6 +680,20 @@ weston_simple_dmabuf_v4l_CFLAGS = $(AM_CFLAGS) $(SIMPLE_DMABUF_V4L_CLIENT_CFLAGS
 weston_simple_dmabuf_v4l_LDADD = $(SIMPLE_DMABUF_V4L_CLIENT_LIBS) libshared.la
 endif

+if BUILD_SIMPLE_DMABUF_EGL_CLIENT
+demo_clients += weston-simple-dmabuf-egl
+weston_simple_dmabuf_egl_SOURCES = clients/simple-dmabuf-egl.c
+nodist_weston_simple_dmabuf_egl_SOURCES =		\
+	protocol/xdg-shell-unstable-v6-protocol.c		\
+	protocol/xdg-shell-unstable-v6-client-protocol.h	\
+	protocol/fullscreen-shell-unstable-v1-protocol.c	\
+	protocol/fullscreen-shell-unstable-v1-client-protocol.h \
+	protocol/linux-dmabuf-unstable-v1-protocol.c \
+	protocol/linux-dmabuf-unstable-v1-client-protocol.h
+weston_simple_dmabuf_egl_CFLAGS = $(AM_CFLAGS) $(SIMPLE_DMABUF_EGL_CLIENT_CFLAGS)
+weston_simple_dmabuf_egl_LDADD = $(SIMPLE_DMABUF_EGL_CLIENT_LIBS) libshared.la
+endif
+
 noinst_LTLIBRARIES += libtoytoolkit.la

 libtoytoolkit_la_SOURCES =				\
--- a/clients/meson.build
+++ b/clients/meson.build
@ -48,6 +48,25 @@ simple_clients = [
 		],
 		'dep_objs': [ dep_wayland_client, dep_libshared ]
 	},
+	{
+		'name': 'dmabuf-egl',
+		'sources': [
+			'simple-dmabuf-egl.c',
+			linux_dmabuf_unstable_v1_client_protocol_h,
+			linux_dmabuf_unstable_v1_protocol_c,
+			xdg_shell_unstable_v6_client_protocol_h,
+			xdg_shell_unstable_v6_protocol_c,
+			fullscreen_shell_unstable_v1_client_protocol_h,
+			fullscreen_shell_unstable_v1_protocol_c,
+		],
+		'dep_objs': [
+			dep_wayland_client,
+			dep_libdrm_headers,
+			dep_gbm,
+			dep_egl,
+			dep_glesv2
+		]
+	},
 	{
 		'name': 'dmabuf-v4l',
 		'sources': [
--- a/clients/simple-dmabuf-egl.c
+++ b/clients/simple-dmabuf-egl.c
@ -0,0 +1,846 @@
+/*
+ * Copyright © 2011 Benjamin Franzke
+ * Copyright © 2010 Intel Corporation
+ * Copyright © 2014,2018 Collabora Ltd.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "config.h"
+
+#include <assert.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <drm_fourcc.h>
+#include <gbm.h>
+
+#include <wayland-client.h>
+#include "shared/platform.h"
+#include "shared/zalloc.h"
+#include "xdg-shell-unstable-v6-client-protocol.h"
+#include "fullscreen-shell-unstable-v1-client-protocol.h"
+#include "linux-dmabuf-unstable-v1-client-protocol.h"
+
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+#include <GLES2/gl2.h>
+#include <GLES2/gl2ext.h>
+
+#include "shared/weston-egl-ext.h"
+
+#ifndef DRM_FORMAT_MOD_INVALID
+#define DRM_FORMAT_MOD_INVALID ((1ULL << 56) - 1)
+#endif
+
+/* Possible options that affect the displayed image */
+#define OPT_IMMEDIATE  1  /* create wl_buffer immediately */
+
+struct display {
+	struct wl_display *display;
+	struct wl_registry *registry;
+	struct wl_compositor *compositor;
+	struct zxdg_shell_v6 *shell;
+	struct zwp_fullscreen_shell_v1 *fshell;
+	struct zwp_linux_dmabuf_v1 *dmabuf;
+	int xrgb8888_format_found;
+	int req_dmabuf_immediate;
+	struct {
+		EGLDisplay display;
+		EGLContext context;
+		PFNEGLCREATEIMAGEKHRPROC create_image;
+		PFNEGLDESTROYIMAGEKHRPROC destroy_image;
+		PFNGLEGLIMAGETARGETTEXTURE2DOESPROC image_target_texture_2d;
+	} egl;
+	struct {
+		int drm_fd;
+		struct gbm_device *device;
+	} gbm;
+};
+
+struct buffer {
+	struct display *display;
+	struct wl_buffer *buffer;
+	int busy;
+
+	struct gbm_bo *bo;
+
+	int dmabuf_fd;
+
+	int width;
+	int height;
+	uint32_t stride;
+	int format;
+
+	EGLImageKHR egl_image;
+	GLuint gl_texture;
+	GLuint gl_fbo;
+};
+
+#define NUM_BUFFERS 3
+
+struct window {
+	struct display *display;
+	int width, height;
+	struct wl_surface *surface;
+	struct zxdg_surface_v6 *xdg_surface;
+	struct zxdg_toplevel_v6 *xdg_toplevel;
+	struct buffer buffers[NUM_BUFFERS];
+	struct wl_callback *callback;
+	bool initialized;
+	bool wait_for_configure;
+};
+
+static sig_atomic_t running = 1;
+
+static void
+redraw(void *data, struct wl_callback *callback, uint32_t time);
+
+static void
+buffer_release(void *data, struct wl_buffer *buffer)
+{
+	struct buffer *mybuf = data;
+
+	mybuf->busy = 0;
+}
+
+static const struct wl_buffer_listener buffer_listener = {
+	buffer_release
+};
+
+static void
+buffer_free(struct buffer *buf)
+{
+	if (buf->gl_fbo)
+		glDeleteFramebuffers(1, &buf->gl_fbo);
+
+	if (buf->gl_texture)
+		glDeleteTextures(1, &buf->gl_texture);
+
+	if (buf->egl_image) {
+		buf->display->egl.destroy_image(buf->display->egl.display,
+						buf->egl_image);
+	}
+
+	if (buf->buffer)
+		wl_buffer_destroy(buf->buffer);
+
+	if (buf->bo)
+		gbm_bo_destroy(buf->bo);
+
+	if (buf->dmabuf_fd >= 0)
+		close(buf->dmabuf_fd);
+}
+
+static void
+create_succeeded(void *data,
+		 struct zwp_linux_buffer_params_v1 *params,
+		 struct wl_buffer *new_buffer)
+{
+	struct buffer *buffer = data;
+
+	buffer->buffer = new_buffer;
+	wl_buffer_add_listener(buffer->buffer, &buffer_listener, buffer);
+
+	zwp_linux_buffer_params_v1_destroy(params);
+}
+
+static void
+create_failed(void *data, struct zwp_linux_buffer_params_v1 *params)
+{
+	struct buffer *buffer = data;
+
+	buffer->buffer = NULL;
+	running = 0;
+
+	zwp_linux_buffer_params_v1_destroy(params);
+
+	fprintf(stderr, "Error: zwp_linux_buffer_params.create failed.\n");
+}
+
+static const struct zwp_linux_buffer_params_v1_listener params_listener = {
+	create_succeeded,
+	create_failed
+};
+
+static bool
+create_fbo_for_buffer(struct display *display, struct buffer *buffer)
+{
+	EGLint attribs[] = {
+		EGL_WIDTH, buffer->width,
+		EGL_HEIGHT, buffer->height,
+		EGL_LINUX_DRM_FOURCC_EXT, buffer->format,
+		EGL_DMA_BUF_PLANE0_FD_EXT, buffer->dmabuf_fd,
+		EGL_DMA_BUF_PLANE0_OFFSET_EXT, 0,
+		EGL_DMA_BUF_PLANE0_PITCH_EXT, (int) buffer->stride,
+		EGL_NONE
+	};
+
+	buffer->egl_image = display->egl.create_image(display->egl.display,
+						      EGL_NO_CONTEXT,
+						      EGL_LINUX_DMA_BUF_EXT,
+						      NULL, attribs);
+	if (buffer->egl_image == EGL_NO_IMAGE) {
+		fprintf(stderr, "EGLImageKHR creation failed\n");
+		return false;
+	}
+
+	eglMakeCurrent(display->egl.display, EGL_NO_SURFACE, EGL_NO_SURFACE,
+			display->egl.context);
+
+	glGenTextures(1, &buffer->gl_texture);
+	glBindTexture(GL_TEXTURE_2D, buffer->gl_texture);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+
+	display->egl.image_target_texture_2d(GL_TEXTURE_2D, buffer->egl_image);
+
+	glGenFramebuffers(1, &buffer->gl_fbo);
+	glBindFramebuffer(GL_FRAMEBUFFER, buffer->gl_fbo);
+	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+			       GL_TEXTURE_2D, buffer->gl_texture, 0);
+	if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
+		fprintf(stderr, "FBO creation failed\n");
+		return false;
+	}
+
+	return true;
+}
+
+
+static int
+create_dmabuf_buffer(struct display *display, struct buffer *buffer,
+		     int width, int height, int format)
+{
+	static const uint32_t flags = 0;
+	static const uint64_t modifier = DRM_FORMAT_MOD_INVALID;
+	struct zwp_linux_buffer_params_v1 *params;
+
+	buffer->display = display;
+	buffer->width = width;
+	buffer->height = height;
+	buffer->format = format;
+
+	buffer->bo = gbm_bo_create(display->gbm.device,
+				   buffer->width, buffer->height,
+				   format,
+				   GBM_BO_USE_RENDERING);
+	if (!buffer->bo) {
+		fprintf(stderr, "create_bo failed\n");
+		goto error;
+	}
+
+	buffer->stride = gbm_bo_get_stride(buffer->bo);
+	buffer->dmabuf_fd = gbm_bo_get_fd(buffer->bo);
+
+	if (buffer->dmabuf_fd < 0) {
+		fprintf(stderr, "error: dmabuf_fd < 0\n");
+		goto error;
+	}
+
+	params = zwp_linux_dmabuf_v1_create_params(display->dmabuf);
+	zwp_linux_buffer_params_v1_add(params,
+				       buffer->dmabuf_fd,
+				       0, /* plane_idx */
+				       0, /* offset */
+				       buffer->stride,
+				       modifier >> 32,
+				       modifier & 0xffffffff);
+
+	zwp_linux_buffer_params_v1_add_listener(params, &params_listener, buffer);
+	if (display->req_dmabuf_immediate) {
+		buffer->buffer =
+			zwp_linux_buffer_params_v1_create_immed(params,
+								buffer->width,
+								buffer->height,
+								format,
+								flags);
+		wl_buffer_add_listener(buffer->buffer, &buffer_listener, buffer);
+	}
+	else {
+		zwp_linux_buffer_params_v1_create(params,
+						  buffer->width,
+						  buffer->height,
+						  format,
+						  flags);
+	}
+
+	if (!create_fbo_for_buffer(display, buffer))
+		goto error;
+
+	return 0;
+
+error:
+	buffer_free(buffer);
+	return -1;
+}
+
+static void
+xdg_surface_handle_configure(void *data, struct zxdg_surface_v6 *surface,
+			     uint32_t serial)
+{
+	struct window *window = data;
+
+	zxdg_surface_v6_ack_configure(surface, serial);
+
+	if (window->initialized && window->wait_for_configure)
+		redraw(window, NULL, 0);
+	window->wait_for_configure = false;
+}
+
+static const struct zxdg_surface_v6_listener xdg_surface_listener = {
+	xdg_surface_handle_configure,
+};
+
+static void
+xdg_toplevel_handle_configure(void *data, struct zxdg_toplevel_v6 *toplevel,
+			      int32_t width, int32_t height,
+			      struct wl_array *states)
+{
+}
+
+static void
+xdg_toplevel_handle_close(void *data, struct zxdg_toplevel_v6 *xdg_toplevel)
+{
+	running = 0;
+}
+
+static const struct zxdg_toplevel_v6_listener xdg_toplevel_listener = {
+	xdg_toplevel_handle_configure,
+	xdg_toplevel_handle_close,
+};
+
+static struct window *
+create_window(struct display *display, int width, int height)
+{
+	struct window *window;
+	int i;
+	int ret;
+
+	window = zalloc(sizeof *window);
+	if (!window)
+		return NULL;
+
+	window->callback = NULL;
+	window->display = display;
+	window->width = width;
+	window->height = height;
+	window->surface = wl_compositor_create_surface(display->compositor);
+
+	if (display->shell) {
+		window->xdg_surface =
+			zxdg_shell_v6_get_xdg_surface(display->shell,
+						      window->surface);
+
+		assert(window->xdg_surface);
+
+		zxdg_surface_v6_add_listener(window->xdg_surface,
+					     &xdg_surface_listener, window);
+
+		window->xdg_toplevel =
+			zxdg_surface_v6_get_toplevel(window->xdg_surface);
+
+		assert(window->xdg_toplevel);
+
+		zxdg_toplevel_v6_add_listener(window->xdg_toplevel,
+					      &xdg_toplevel_listener, window);
+
+		zxdg_toplevel_v6_set_title(window->xdg_toplevel, "simple-dmabuf-egl");
+
+		window->wait_for_configure = true;
+		wl_surface_commit(window->surface);
+	} else if (display->fshell) {
+		zwp_fullscreen_shell_v1_present_surface(display->fshell,
+							window->surface,
+							ZWP_FULLSCREEN_SHELL_V1_PRESENT_METHOD_DEFAULT,
+							NULL);
+	} else {
+		assert(0);
+	}
+
+	for (i = 0; i < NUM_BUFFERS; ++i) {
+		ret = create_dmabuf_buffer(display, &window->buffers[i],
+		                           width, height, DRM_FORMAT_XRGB8888);
+
+		if (ret < 0)
+			return NULL;
+	}
+
+	return window;
+}
+
+static void
+destroy_window(struct window *window)
+{
+	int i;
+
+	if (window->callback)
+		wl_callback_destroy(window->callback);
+
+	for (i = 0; i < NUM_BUFFERS; i++) {
+		if (window->buffers[i].buffer)
+			buffer_free(&window->buffers[i]);
+	}
+
+	if (window->xdg_toplevel)
+		zxdg_toplevel_v6_destroy(window->xdg_toplevel);
+	if (window->xdg_surface)
+		zxdg_surface_v6_destroy(window->xdg_surface);
+	wl_surface_destroy(window->surface);
+	free(window);
+}
+
+static struct buffer *
+window_next_buffer(struct window *window)
+{
+	int i;
+
+	for (i = 0; i < NUM_BUFFERS; i++)
+		if (!window->buffers[i].busy)
+			return &window->buffers[i];
+
+	return NULL;
+}
+
+static const struct wl_callback_listener frame_listener;
+
+static void
+redraw(void *data, struct wl_callback *callback, uint32_t time)
+{
+	/* With a 60Hz redraw rate this completes a cycle in 3 seconds */
+	static const int MAX_STEP = 180;
+	static int step = 0;
+	static int step_dir = 1;
+	struct window *window = data;
+	struct buffer *buffer;
+
+	buffer = window_next_buffer(window);
+	if (!buffer) {
+		fprintf(stderr,
+			!callback ? "Failed to create the first buffer.\n" :
+			"All buffers busy at redraw(). Server bug?\n");
+		abort();
+	}
+
+	/* Direct all GL draws to the buffer through the FBO */
+	glBindFramebuffer(GL_FRAMEBUFFER, buffer->gl_fbo);
+
+	/* Cycle between 0 and MAX_STEP */
+	step += step_dir;
+	if (step == 0 || step == MAX_STEP)
+		step_dir = -step_dir;
+
+	glClearColor(0.0,
+		     (float) step / MAX_STEP,
+		     1.0 - (float) step / MAX_STEP,
+		     1.0);
+	glClear(GL_COLOR_BUFFER_BIT);
+	glFinish();
+
+	wl_surface_attach(window->surface, buffer->buffer, 0, 0);
+	wl_surface_damage(window->surface, 0, 0, window->width, window->height);
+
+	if (callback)
+		wl_callback_destroy(callback);
+
+	window->callback = wl_surface_frame(window->surface);
+	wl_callback_add_listener(window->callback, &frame_listener, window);
+	wl_surface_commit(window->surface);
+	buffer->busy = 1;
+}
+
+static const struct wl_callback_listener frame_listener = {
+	redraw
+};
+
+static void
+dmabuf_modifiers(void *data, struct zwp_linux_dmabuf_v1 *zwp_linux_dmabuf,
+		 uint32_t format, uint32_t modifier_hi, uint32_t modifier_lo)
+{
+	struct display *d = data;
+
+	switch (format) {
+	case DRM_FORMAT_XRGB8888:
+		d->xrgb8888_format_found = 1;
+		break;
+	default:
+		break;
+	}
+}
+
+static void
+dmabuf_format(void *data, struct zwp_linux_dmabuf_v1 *zwp_linux_dmabuf, uint32_t format)
+{
+	/* XXX: deprecated */
+}
+
+static const struct zwp_linux_dmabuf_v1_listener dmabuf_listener = {
+	dmabuf_format,
+	dmabuf_modifiers
+};
+
+static void
+xdg_shell_ping(void *data, struct zxdg_shell_v6 *shell, uint32_t serial)
+{
+	zxdg_shell_v6_pong(shell, serial);
+}
+
+static const struct zxdg_shell_v6_listener xdg_shell_listener = {
+	xdg_shell_ping,
+};
+
+static void
+registry_handle_global(void *data, struct wl_registry *registry,
+		       uint32_t id, const char *interface, uint32_t version)
+{
+	struct display *d = data;
+
+	if (strcmp(interface, "wl_compositor") == 0) {
+		d->compositor =
+			wl_registry_bind(registry,
+					 id, &wl_compositor_interface, 1);
+	} else if (strcmp(interface, "zxdg_shell_v6") == 0) {
+		d->shell = wl_registry_bind(registry,
+					    id, &zxdg_shell_v6_interface, 1);
+		zxdg_shell_v6_add_listener(d->shell, &xdg_shell_listener, d);
+	} else if (strcmp(interface, "zwp_fullscreen_shell_v1") == 0) {
+		d->fshell = wl_registry_bind(registry,
+					     id, &zwp_fullscreen_shell_v1_interface, 1);
+	} else if (strcmp(interface, "zwp_linux_dmabuf_v1") == 0) {
+		if (version < 3)
+			return;
+		d->dmabuf = wl_registry_bind(registry,
+					     id, &zwp_linux_dmabuf_v1_interface, 3);
+		zwp_linux_dmabuf_v1_add_listener(d->dmabuf, &dmabuf_listener, d);
+	}
+}
+
+static void
+registry_handle_global_remove(void *data, struct wl_registry *registry,
+			      uint32_t name)
+{
+}
+
+static const struct wl_registry_listener registry_listener = {
+	registry_handle_global,
+	registry_handle_global_remove
+};
+
+static void
+destroy_display(struct display *display)
+{
+	if (display->gbm.device)
+		gbm_device_destroy(display->gbm.device);
+
+	if (display->gbm.drm_fd >= 0)
+		close(display->gbm.drm_fd);
+
+	if (display->egl.context != EGL_NO_CONTEXT)
+		eglDestroyContext(display->egl.display, display->egl.context);
+
+	if (display->egl.display != EGL_NO_DISPLAY)
+		eglTerminate(display->egl.display);
+
+	if (display->dmabuf)
+		zwp_linux_dmabuf_v1_destroy(display->dmabuf);
+
+	if (display->shell)
+		zxdg_shell_v6_destroy(display->shell);
+
+	if (display->fshell)
+		zwp_fullscreen_shell_v1_release(display->fshell);
+
+	if (display->compositor)
+		wl_compositor_destroy(display->compositor);
+
+	if (display->registry)
+		wl_registry_destroy(display->registry);
+
+	if (display->display) {
+		wl_display_flush(display->display);
+		wl_display_disconnect(display->display);
+	}
+
+	free(display);
+}
+
+static bool
+display_set_up_egl(struct display *display)
+{
+	static const EGLint context_attribs[] = {
+		EGL_CONTEXT_CLIENT_VERSION, 2,
+		EGL_NONE
+	};
+	EGLint major, minor;
+	const char *egl_extensions = NULL;
+	const char *gl_extensions = NULL;
+
+	display->egl.display =
+		weston_platform_get_egl_display(EGL_PLATFORM_WAYLAND_KHR,
+						display->display, NULL);
+	if (display->egl.display == EGL_NO_DISPLAY) {
+		fprintf(stderr, "Failed to create EGLDisplay\n");
+		goto error;
+	}
+
+	if (eglInitialize(display->egl.display, &major, &minor) == EGL_FALSE) {
+		fprintf(stderr, "Failed to initialize EGLDisplay\n");
+		goto error;
+	}
+
+	if (eglBindAPI(EGL_OPENGL_ES_API) == EGL_FALSE) {
+		fprintf(stderr, "Failed to bind OpenGL ES API\n");
+		goto error;
+	}
+
+	egl_extensions = eglQueryString(display->egl.display, EGL_EXTENSIONS);
+	assert(egl_extensions != NULL);
+
+	if (!weston_check_egl_extension(egl_extensions,
+					"EGL_EXT_image_dma_buf_import")) {
+		fprintf(stderr, "EGL_EXT_image_dma_buf_import not supported\n");
+		goto error;
+	}
+
+	if (!weston_check_egl_extension(egl_extensions,
+					"EGL_KHR_surfaceless_context")) {
+		fprintf(stderr, "EGL_KHR_surfaceless_context not supported\n");
+		goto error;
+	}
+
+	if (!weston_check_egl_extension(egl_extensions,
+					"EGL_KHR_no_config_context")) {
+		fprintf(stderr, "EGL_KHR_no_config_context not supported\n");
+		goto error;
+	}
+
+	display->egl.context = eglCreateContext(display->egl.display,
+						EGL_NO_CONFIG_KHR,
+						EGL_NO_CONTEXT,
+						context_attribs);
+	if (display->egl.context == EGL_NO_CONTEXT) {
+		fprintf(stderr, "Failed to create EGLContext\n");
+		goto error;
+	}
+
+	eglMakeCurrent(display->egl.display, EGL_NO_SURFACE, EGL_NO_SURFACE,
+		       display->egl.context);
+
+	gl_extensions = (const char *) glGetString(GL_EXTENSIONS);
+	assert(gl_extensions != NULL);
+
+	if (!weston_check_egl_extension(gl_extensions,
+					"GL_OES_EGL_image")) {
+		fprintf(stderr, "GL_OES_EGL_image not suported\n");
+		goto error;
+	}
+
+	display->egl.create_image =
+		(void *) eglGetProcAddress("eglCreateImageKHR");
+	assert(display->egl.create_image);
+
+	display->egl.destroy_image =
+		(void *) eglGetProcAddress("eglDestroyImageKHR");
+	assert(display->egl.destroy_image);
+
+	display->egl.image_target_texture_2d =
+		(void *) eglGetProcAddress("glEGLImageTargetTexture2DOES");
+	assert(display->egl.image_target_texture_2d);
+
+	return true;
+
+error:
+	return false;
+}
+
+static bool
+display_set_up_gbm(struct display *display, char const* drm_render_node)
+{
+	display->gbm.drm_fd = open(drm_render_node, O_RDWR);
+	if (display->gbm.drm_fd < 0) {
+		fprintf(stderr, "Failed to open drm render node %s\n",
+			drm_render_node);
+		return false;
+	}
+
+	display->gbm.device = gbm_create_device(display->gbm.drm_fd);
+	if (display->gbm.device == NULL) {
+		fprintf(stderr, "Failed to create gbm device\n");
+		return false;
+	}
+
+	return true;
+}
+
+static struct display *
+create_display(char const *drm_render_node, int opts)
+{
+	struct display *display = NULL;
+
+	display = zalloc(sizeof *display);
+	if (display == NULL) {
+		fprintf(stderr, "out of memory\n");
+		goto error;
+	}
+
+	display->gbm.drm_fd = -1;
+
+	display->display = wl_display_connect(NULL);
+	assert(display->display);
+
+	display->req_dmabuf_immediate = opts & OPT_IMMEDIATE;
+
+	display->registry = wl_display_get_registry(display->display);
+	wl_registry_add_listener(display->registry,
+				 &registry_listener, display);
+	wl_display_roundtrip(display->display);
+	if (display->dmabuf == NULL) {
+		fprintf(stderr, "No zwp_linux_dmabuf global\n");
+		goto error;
+	}
+
+	wl_display_roundtrip(display->display);
+
+	if (!display->xrgb8888_format_found) {
+		fprintf(stderr, "format XRGB8888 is not available\n");
+		goto error;
+	}
+
+	if (!display_set_up_egl(display))
+		goto error;
+
+	if (!display_set_up_gbm(display, drm_render_node))
+		goto error;
+
+	return display;
+
+error:
+	if (display != NULL)
+		destroy_display(display);
+	return NULL;
+}
+
+static void
+signal_int(int signum)
+{
+	running = 0;
+}
+
+static void
+print_usage_and_exit(void)
+{
+	printf("usage flags:\n"
+		"\t'-i,--import-immediate=<>'"
+		"\n\t\t0 to import dmabuf via roundtrip, "
+		"\n\t\t1 to enable import without roundtrip\n"
+		"\t'-d,--drm-render-node=<>'"
+		"\n\t\tthe full path to the drm render node to use\n");
+	exit(0);
+}
+
+static int
+is_true(const char* c)
+{
+	if (!strcmp(c, "1"))
+		return 1;
+	else if (!strcmp(c, "0"))
+		return 0;
+	else
+		print_usage_and_exit();
+
+	return 0;
+}
+
+int
+main(int argc, char **argv)
+{
+	struct sigaction sigint;
+	struct display *display;
+	struct window *window;
+	int opts = 0;
+	char const *drm_render_node = "/dev/dri/renderD128";
+	int c, option_index, ret = 0;
+
+	static struct option long_options[] = {
+		{"import-immediate", required_argument, 0,  'i' },
+		{"drm-render-node",  required_argument, 0,  'd' },
+		{"help",             no_argument      , 0,  'h' },
+		{0, 0, 0, 0}
+	};
+
+	while ((c = getopt_long(argc, argv, "hi:d:",
+				  long_options, &option_index)) != -1) {
+		switch (c) {
+		case 'i':
+			if (is_true(optarg))
+				opts |= OPT_IMMEDIATE;
+			break;
+		case 'd':
+			drm_render_node = optarg;
+			break;
+		default:
+			print_usage_and_exit();
+		}
+	}
+
+	display = create_display(drm_render_node, opts);
+	if (!display)
+		return 1;
+	window = create_window(display, 256, 256);
+	if (!window)
+		return 1;
+
+	sigint.sa_handler = signal_int;
+	sigemptyset(&sigint.sa_mask);
+	sigint.sa_flags = SA_RESETHAND;
+	sigaction(SIGINT, &sigint, NULL);
+
+	/* Here we retrieve the linux-dmabuf objects if executed without immed,
+	 * or error */
+	wl_display_roundtrip(display->display);
+
+	if (!running)
+		return 1;
+
+	window->initialized = true;
+
+	if (!window->wait_for_configure)
+		redraw(window, NULL, 0);
+
+	while (running && ret != -1)
+		ret = wl_display_dispatch(display->display);
+
+	fprintf(stderr, "simple-dmabuf-egl exiting\n");
+	destroy_window(window);
+	destroy_display(display);
+
+	return 0;
+}
--- a/configure.ac
+++ b/configure.ac
@ -451,6 +451,21 @@ if ! test "x$enable_simple_dmabuf_v4l_client" = "xno"; then
 fi
 AM_CONDITIONAL(BUILD_SIMPLE_DMABUF_V4L_CLIENT, test "x$enable_simple_dmabuf_v4l_client" = "xyes")

+AC_ARG_ENABLE(simple-dmabuf-egl-client,
+              AS_HELP_STRING([--disable-simple-dmabuf-egl-client],
+                             [do not build the simple dmabuf egl client]),,
+              enable_simple_dmabuf_egl_client="auto")
+if ! test "x$enable_simple_dmabuf_egl_client" = "xno"; then
+  PKG_CHECK_MODULES(SIMPLE_DMABUF_EGL_CLIENT, [wayland-client libdrm gbm egl glesv2],
+		    [have_simple_dmabuf_egl_client=yes], [have_simple_dmabuf_egl_client=no])
+
+  if test "x$have_simple_dmabuf_egl_client" = "xno" -a "x$enable_simple_dmabuf_egl_client" = "xyes"; then
+    AC_MSG_ERROR([EGL dmabuf client explicitly enabled, but libdrm/egl/glev2 couldn't be found])
+  fi
+  enable_simple_dmabuf_egl_client="$have_simple_dmabuf_egl_client"
+fi
+AM_CONDITIONAL(BUILD_SIMPLE_DMABUF_EGL_CLIENT, test "x$enable_simple_dmabuf_egl_client" = "xyes")
+
 AC_ARG_ENABLE(clients, [  --enable-clients],, enable_clients=yes)
 AM_CONDITIONAL(BUILD_CLIENTS, test x$enable_clients = xyes)
 have_cairo_egl=no