Merge pull request #17 from nyorain/wayland-backend

Basic Wayland backend

.gitignore

@@ -3,6 +3,7 @@ CMakeFiles
 Makefile
 cmake_install.cmake
 install_manifest.txt
+.clang_complete
 *.swp
 *.o
 *.a

backend/CMakeLists.txt

@@ -6,11 +6,10 @@ include_directories(
 )
 
 add_library(wlr-backend
-    #wayland/backend.c
+    wayland/backend.c
-    #wayland/registry.c
+    wayland/registry.c
-    #wayland/wl_seat.c
+    wayland/wl_seat.c
-    #wayland/wl_output.c
+    wayland/output.c
-
     drm/backend.c
     drm/drm.c
 

backend/backend.c

@@ -8,6 +8,7 @@
 #include <wlr/backend/interface.h>
 #include <wlr/backend/drm.h>
 #include <wlr/backend/libinput.h>
+#include <wlr/backend/wayland.h>
 #include <wlr/backend/multi.h>
 #include "backend/libinput.h"
 #include "backend/udev.h"
@@ -42,6 +43,9 @@ struct wlr_backend *wlr_backend_autocreate(struct wl_display *display,
 		struct wlr_session *session) {
 	// TODO: Choose the most appropriate backend for the situation
 	// Attempt DRM+libinput
+	if (getenv("WAYLAND_DISPLAY") || getenv("_WAYLAND_DISPLAY")) {
+		return wlr_wl_backend_create(display, 1);
+	}
 	struct wlr_udev *udev;
 	if (!(udev = wlr_udev_create(display))) {
 		wlr_log(L_ERROR, "Failed to start udev");

backend/drm/drm.c

@@ -260,6 +260,7 @@ static bool wlr_drm_output_set_mode(struct wlr_output_state *output,
 	output->width = output->wlr_output->width = mode->width;
 	output->height = output->wlr_output->height = mode->height;
 	output->wlr_output->current_mode = mode;
+	wl_signal_emit(&output->wlr_output->events.resolution, output->wlr_output);
 
 	if (!display_init_renderer(&state->renderer, output)) {
 		wlr_log(L_ERROR, "Failed to initalise renderer for %s", output->wlr_output->name);

backend/egl.c

@@ -6,7 +6,7 @@
 #include "backend/egl.h"
 #include "common/log.h"
 
-static const char *egl_error(void) {
+const char *egl_error(void) {
 	switch (eglGetError()) {
 	case EGL_SUCCESS:
 		return "Success";
@@ -68,11 +68,12 @@ static bool egl_exts() {
 	return true;
 }
 
-static bool egl_get_config(EGLDisplay disp, EGLConfig *out) {
+static bool egl_get_config(EGLDisplay disp, EGLConfig *out, EGLenum platform) {
 	EGLint count = 0, matched = 0, ret;
 
 	ret = eglGetConfigs(disp, NULL, 0, &count);
 	if (ret == EGL_FALSE || count == 0) {
+		wlr_log(L_ERROR, "eglGetConfigs returned no configs");
 		return false;
 	}
 
@@ -80,12 +81,18 @@ static bool egl_get_config(EGLDisplay disp, EGLConfig *out) {
 
 	ret = eglChooseConfig(disp, NULL, configs, count, &matched);
 	if (ret == EGL_FALSE) {
+		wlr_log(L_ERROR, "eglChooseConfig failed");
 		return false;
 	}
 
 	for (int i = 0; i < matched; ++i) {
 		EGLint gbm_format;
 
+		if(platform == EGL_PLATFORM_WAYLAND_EXT) {
+			*out = configs[i];
+			return true;
+		}
+
 		if (!eglGetConfigAttrib(disp,
 					configs[i],
 					EGL_NATIVE_VISUAL_ID,
@@ -101,6 +108,7 @@ static bool egl_get_config(EGLDisplay disp, EGLConfig *out) {
 		}
 	}
 
+	wlr_log(L_ERROR, "no valid egl config found");
 	return false;
 }
 
@@ -127,7 +135,7 @@ bool wlr_egl_init(struct wlr_egl *egl, EGLenum platform, void *display) {
 		goto error;
 	}
 
-	if (!egl_get_config(egl->display, &egl->config)) {
+	if (!egl_get_config(egl->display, &egl->config, platform)) {
 		wlr_log(L_ERROR, "Failed to get EGL config");
 		goto error;
 	}

backend/wayland/backend.c

@@ -2,26 +2,28 @@
 #include <stdint.h>
 #include <wayland-server.h>
 #include <assert.h>
+#include <wlr/backend/interface.h>
+#include <wlr/types.h>
 #include "backend/wayland.h"
 #include "common/log.h"
+#include "types.h"
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
 
-void wlr_wl_backend_free(struct wlr_wl_backend *backend) {
+static int dispatch_events(int fd, uint32_t mask, void *data) {
-	if (!backend) {
+	struct wlr_backend_state *state = data;
-		return;
+	int count = 0;
+	if (mask & WL_EVENT_READABLE) {
+		count = wl_display_dispatch(state->remote_display);
 	}
-	// TODO: Free surfaces
+	if (mask & WL_EVENT_WRITABLE) {
-	for (size_t i = 0; backend->outputs && i < backend->outputs->length; ++i) {
+		count = wl_display_flush(state->remote_display);
-		struct wlr_wl_output *output = backend->outputs->items[i];
-		wlr_wl_output_free(output);
 	}
-	list_free(backend->outputs);
+	if (mask == 0) {
-	if (backend->seat) wlr_wl_seat_free(backend->seat);
+		count = wl_display_dispatch_pending(state->remote_display);
-	if (backend->shm) wl_shm_destroy(backend->shm);
+		wl_display_flush(state->remote_display);
-	if (backend->shell) wl_shell_destroy(backend->shell);
+	}
-	if (backend->compositor) wl_compositor_destroy(backend->compositor);
+	return count;
-	if (backend->registry) wl_registry_destroy(backend->registry);
-	if (backend->remote_display) wl_display_disconnect(backend->remote_display);
-	free(backend);
 }
 
 /*
@@ -29,31 +31,116 @@ void wlr_wl_backend_free(struct wlr_wl_backend *backend) {
  * compositor and creates surfaces for each output, then registers globals on
  * the specified display.
  */
-struct wlr_wl_backend *wlr_wl_backend_init(
+static bool wlr_wl_backend_init(struct wlr_backend_state* state) {
-		struct wl_display *display, size_t outputs) {
+	wlr_log(L_INFO, "Initializating wayland backend");
-	assert(display);
+
-	struct wlr_wl_backend *backend;
+	state->remote_display = wl_display_connect(getenv("_WAYLAND_DISPLAY"));
-	if (!(backend = calloc(sizeof(struct wlr_wl_backend), 1))) {
+	if (!state->remote_display) {
-		wlr_log(L_ERROR, "Could not allocate backend");
+		wlr_log_errno(L_ERROR, "Could not connect to remote display");
+		return false;
+	}
+
+	if (!(state->registry = wl_display_get_registry(state->remote_display))) {
+		wlr_log_errno(L_ERROR, "Could not obtain reference to remote registry");
+		return false;
+	}
+
+	wlr_wl_registry_poll(state);
+	if (!(state->compositor) || (!(state->shell))) {
+		wlr_log_errno(L_ERROR, "Could not obtain retrieve required globals");
+		return false;
+	}
+
+	wlr_egl_init(&state->egl, EGL_PLATFORM_WAYLAND_EXT, state->remote_display);
+	for (size_t i = 0; i < state->num_outputs; ++i) {
+		if(!(state->outputs[i] = wlr_wl_output_create(state, i))) {
+			wlr_log_errno(L_ERROR, "Failed to create %zuth output", i);
+			return false;
+		}
+	}
+
+	struct wl_event_loop *loop = wl_display_get_event_loop(state->local_display);
+	int fd = wl_display_get_fd(state->remote_display);
+	int events = WL_EVENT_READABLE | WL_EVENT_ERROR |
+		WL_EVENT_HANGUP | WL_EVENT_WRITABLE;
+	state->remote_display_src = wl_event_loop_add_fd(loop, fd, events,
+			dispatch_events, state);
+	wl_event_source_check(state->remote_display_src);
+
+	return true;
+}
+
+static void wlr_wl_backend_destroy(struct wlr_backend_state *state) {
+	if (!state) {
+		return;
+	}
+
+	for (size_t i = 0; i < state->num_outputs; ++i) {
+		wlr_output_destroy(state->outputs[i]);
+	}
+
+	for (size_t i = 0; state->devices && i < state->devices->length; ++i) {
+		wlr_input_device_destroy(state->devices->items[i]);
+	}
+
+	list_free(state->devices);
+
+	wlr_egl_free(&state->egl);
+	free(state->outputs);
+	if (state->seat) wl_seat_destroy(state->seat);
+	if (state->shm) wl_shm_destroy(state->shm);
+	if (state->shell) wl_shell_destroy(state->shell);
+	if (state->compositor) wl_compositor_destroy(state->compositor);
+	if (state->registry) wl_registry_destroy(state->registry);
+	if (state->remote_display) wl_display_disconnect(state->remote_display);
+	free(state);
+}
+
+static struct wlr_backend_impl backend_impl = {
+	.init = wlr_wl_backend_init,
+	.destroy = wlr_wl_backend_destroy
+};
+
+
+struct wlr_backend *wlr_wl_backend_create(struct wl_display *display,
+		size_t num_outputs) {
+	wlr_log(L_INFO, "Creating wayland backend");
+
+	struct wlr_backend_state *state = calloc(1, sizeof(struct wlr_backend_state));
+	if (!state) {
+		wlr_log(L_ERROR, "Allocation failed: %s", strerror(errno));
+		return NULL;
+	}
+
+	struct wlr_backend *backend = wlr_backend_create(&backend_impl, state);
+	if (!backend) {
+		wlr_log(L_ERROR, "Allocation failed: %s", strerror(errno));
+		return NULL;
+	}
+
+	if (!(state->devices = list_create())) {
+		wlr_log(L_ERROR, "Could not allocate devices list");
 		goto error;
 	}
-	if (!(backend->outputs = list_create())) {
+
-		wlr_log(L_ERROR, "Could not allocate output list");
+	if (!(state->outputs = calloc(sizeof(void*), num_outputs))) {
+		wlr_log(L_ERROR, "Could not allocate outputs list");
 		goto error;
 	}
-	backend->local_display = display;
+
-	backend->remote_display = wl_display_connect(getenv("_WAYLAND_DISPLAY"));
+	state->local_display = display;
-	if (!backend->remote_display) {
+	state->backend = backend;
-		wlr_log(L_ERROR, "Could not connect to remote display");
+	state->num_outputs = num_outputs;
-		goto error;
+
-	}
-	if (!(backend->registry = wl_display_get_registry(backend->remote_display))) {
-		wlr_log(L_ERROR, "Could not obtain reference to remote registry");
-		goto error;
-	}
-	wlr_wlb_registry_poll(backend);
 	return backend;
+
 error:
-	wlr_wl_backend_free(backend);
+	if (state) {
+		free(state->outputs);
+		free(state->devices);
+		free(state->devices);
+	}
+	free(state);
+	free(backend);
 	return NULL;
 }

backend/wayland/output.c

@@ -0,0 +1,149 @@
+#include <stdio.h>
+#include <assert.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <wayland-client.h>
+#include <wlr/types.h>
+#include <GLES3/gl3.h>
+#include "types.h"
+#include "backend/wayland.h"
+#include "common/log.h"
+
+static struct wl_callback_listener frame_listener;
+
+static void surface_frame_callback(void *data, struct wl_callback *cb, uint32_t time) {
+	struct wlr_output_state *output = data;
+	assert(output);
+
+	if (!eglMakeCurrent(output->backend->egl.display,
+		output->egl_surface, output->egl_surface,
+		output->backend->egl.context)) {
+		wlr_log(L_ERROR, "eglMakeCurrent failed: %s", egl_error());
+		return;
+	}
+
+	wl_signal_emit(&output->output->events.frame, output->output);
+	output->frame_callback = wl_surface_frame(output->surface);
+	wl_callback_add_listener(output->frame_callback, &frame_listener, output);
+	wl_callback_destroy(cb);
+
+	if (!eglSwapBuffers(output->backend->egl.display, output->egl_surface)) {
+		wlr_log(L_ERROR, "eglSwapBuffers failed: %s", egl_error());
+		return;
+	}
+}
+
+static struct wl_callback_listener frame_listener = {
+	.done = surface_frame_callback
+};
+
+static void wlr_wl_output_transform(struct wlr_output_state *output,
+		enum wl_output_transform transform) {
+	// TODO
+}
+
+static void wlr_wl_output_destroy(struct wlr_output_state *output) {
+	if(output->frame_callback) wl_callback_destroy(output->frame_callback);
+	eglDestroySurface(output->backend->egl.display, output->surface);
+	wl_egl_window_destroy(output->egl_window);
+	wl_shell_surface_destroy(output->shell_surface);
+	wl_surface_destroy(output->surface);
+	free(output);
+}
+
+static struct wlr_output_impl output_impl = {
+	.transform = wlr_wl_output_transform,
+	.destroy = wlr_wl_output_destroy,
+};
+
+void handle_ping(void* data, struct wl_shell_surface* ssurface, uint32_t serial) {
+	struct wlr_output_state *output = data;
+	assert(output && output->shell_surface == ssurface);
+	wl_shell_surface_pong(ssurface, serial);
+}
+
+void handle_configure(void *data, struct wl_shell_surface *wl_shell_surface,
+		uint32_t edges, int32_t width, int32_t height){
+	struct wlr_output_state *ostate = data;
+	assert(ostate && ostate->shell_surface == wl_shell_surface);
+	struct wlr_output *output = ostate->output;
+	wl_egl_window_resize(ostate->egl_window, width, height, 0, 0);
+	output->width = width;
+	output->height = height;
+	wlr_output_update_matrix(output);
+	wl_signal_emit(&output->events.resolution, output);
+}
+
+void handle_popup_done(void *data, struct wl_shell_surface *wl_shell_surface) {
+	wlr_log(L_ERROR, "Unexpected wl_shell_surface.popup_done event");
+}
+
+static struct wl_shell_surface_listener shell_surface_listener = {
+	.ping = handle_ping,
+	.configure = handle_configure,
+	.popup_done = handle_popup_done
+};
+
+struct wlr_output *wlr_wl_output_create(struct wlr_backend_state* backend,
+		size_t id) {
+	struct wlr_output_state *ostate;
+	if (!(ostate = calloc(sizeof(struct wlr_output_state), 1))) {
+		wlr_log(L_ERROR, "Failed to allocate wlr_output_state");
+		return NULL;
+	}
+
+	struct wlr_output *wlr_output = wlr_output_create(&output_impl, ostate);
+	if (!wlr_output) {
+		free(ostate);
+		wlr_log_errno(L_ERROR, "Allocation failed");
+		return NULL;
+	}
+
+	wlr_output->width = 640;
+	wlr_output->height = 480;
+	wlr_output->scale = 1;
+	strncpy(wlr_output->make, "wayland", sizeof(wlr_output->make));
+	strncpy(wlr_output->model, "wayland", sizeof(wlr_output->model));
+	snprintf(wlr_output->name, sizeof(wlr_output->name), "WL-%d", 1);
+
+	ostate->id = id;
+	ostate->backend = backend;
+	ostate->output = wlr_output;
+
+	// TODO: error handling
+	ostate->surface = wl_compositor_create_surface(backend->compositor);
+	ostate->shell_surface = wl_shell_get_shell_surface(backend->shell, ostate->surface);
+
+	wl_shell_surface_set_class(ostate->shell_surface, "sway");
+	wl_shell_surface_set_title(ostate->shell_surface, "sway-wl");
+	wl_shell_surface_add_listener(ostate->shell_surface, &shell_surface_listener, ostate);
+	wl_shell_surface_set_toplevel(ostate->shell_surface);
+
+	ostate->egl_window = wl_egl_window_create(ostate->surface,
+			wlr_output->width, wlr_output->height);
+	ostate->egl_surface = wlr_egl_create_surface(&backend->egl, ostate->egl_window);
+
+	// start rendering loop per callbacks by rendering first frame
+	if (!eglMakeCurrent(ostate->backend->egl.display,
+		ostate->egl_surface, ostate->egl_surface,
+		ostate->backend->egl.context)) {
+		wlr_log(L_ERROR, "eglMakeCurrent failed: %s", egl_error());
+		return false;
+	}
+
+	glViewport(0, 0, wlr_output->width, wlr_output->height);
+	glClearColor(1.0, 1.0, 1.0, 1.0);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	ostate->frame_callback = wl_surface_frame(ostate->surface);
+	wl_callback_add_listener(ostate->frame_callback, &frame_listener, ostate);
+
+	if (!eglSwapBuffers(ostate->backend->egl.display, ostate->egl_surface)) {
+		wlr_log(L_ERROR, "eglSwapBuffers failed: %s", egl_error());
+		return false;
+	}
+
+	wl_signal_emit(&backend->backend->events.output_add, wlr_output);
+	return wlr_output;
+}

backend/wayland/registry.c

@@ -2,77 +2,29 @@
 #include <stdlib.h>
 #include <string.h>
 #include <wayland-client.h>
+#include <wlr/types.h>
+#include "types.h"
 #include "backend/wayland.h"
 #include "common/log.h"
 
-static void registry_wl_seat(struct wlr_wl_backend *backend,
-		struct wl_seat *wl_seat, struct wl_registry *registry, uint32_t version) {
-	struct wlr_wl_seat *seat;
-	if (!(seat = calloc(sizeof(struct wlr_wl_seat), 1))) {
-		wlr_log(L_ERROR, "Failed to allocate wlr_wl_seat");
-		goto error;
-	}
-	if (!(seat->keyboards = list_create())) {
-		wlr_log(L_ERROR, "Failed to allocate wlr_wl_seat");
-		goto error;
-	}
-	if (!(seat->pointers = list_create())) {
-		wlr_log(L_ERROR, "Failed to allocate wlr_wl_pointer");
-		goto error;
-	}
-	seat->wl_seat = wl_seat;
-	wl_seat_set_user_data(wl_seat, backend);
-	wl_seat_add_listener(wl_seat, &seat_listener, seat);
-	return;
-error:
-	wlr_wl_seat_free(seat);
-	return;
-}
-
-static void registry_wl_output(struct wlr_wl_backend *backend,
-		struct wl_output *wl_output, struct wl_registry *registry, uint32_t version) {
-	struct wlr_wl_output *output;
-	if (!(output = calloc(sizeof(struct wlr_wl_output), 1))) {
-		wlr_log(L_ERROR, "Failed to allocate wlr_wl_output");
-		goto error;
-	}
-	if (!(output->modes = list_create())) {
-		wlr_log(L_ERROR, "Failed to allocate wlr_wl_output");
-		goto error;
-	}
-	output->wl_output = wl_output;
-	output->scale = 1;
-	list_add(backend->outputs, output);
-	wl_output_set_user_data(wl_output, backend);
-	wl_output_add_listener(wl_output, &output_listener, output);
-	return;
-error:
-	wlr_wl_output_free(output);
-	return;
-}
-
 static void registry_global(void *data, struct wl_registry *registry,
 		uint32_t name, const char *interface, uint32_t version) {
-	struct wlr_wl_backend *backend = data;
+	struct wlr_backend_state *state = data;
 	wlr_log(L_DEBUG, "Remote wayland global: %s v%d", interface, version);
 
 	if (strcmp(interface, wl_compositor_interface.name) == 0) {
-		backend->compositor = wl_registry_bind(registry, name,
+		state->compositor = wl_registry_bind(registry, name,
 				&wl_compositor_interface, version);
 	} else if (strcmp(interface, wl_shell_interface.name) == 0) {
-		backend->shell = wl_registry_bind(registry, name,
+		state->shell = wl_registry_bind(registry, name,
 				&wl_shell_interface, version);
 	} else if (strcmp(interface, wl_shm_interface.name) == 0) {
-		backend->shm = wl_registry_bind(registry, name,
+		state->shm = wl_registry_bind(registry, name,
 				&wl_shm_interface, version);
 	} else if (strcmp(interface, wl_seat_interface.name) == 0) {
-		struct wl_seat *wl_seat = wl_registry_bind(registry, name,
+		state->seat = wl_registry_bind(registry, name,
 				&wl_seat_interface, version);
-		registry_wl_seat(backend, wl_seat, registry, version);
+		wl_seat_add_listener(state->seat, &seat_listener, state);
-	} else if (strcmp(interface, wl_output_interface.name) == 0) {
-		struct wl_output *wl_output = wl_registry_bind(registry, name,
-				&wl_output_interface, version);
-		registry_wl_output(backend, wl_output, registry, version);
 	}
 }
 
@@ -86,8 +38,8 @@ static const struct wl_registry_listener registry_listener = {
 	.global_remove = registry_global_remove
 };
 
-void wlr_wlb_registry_poll(struct wlr_wl_backend *backend) {
+void wlr_wl_registry_poll(struct wlr_backend_state *state) {
-	wl_registry_add_listener(backend->registry, &registry_listener, backend);
+	wl_registry_add_listener(state->registry, &registry_listener, state);
-	wl_display_dispatch(backend->remote_display);
+	wl_display_dispatch(state->remote_display);
-	wl_display_roundtrip(backend->remote_display);
+	wl_display_roundtrip(state->remote_display);
 }

backend/wayland/wl_output.c

@@ -1,64 +0,0 @@
-#define _XOPEN_SOURCE 500
-#include <string.h>
-#include <assert.h>
-#include <stdlib.h>
-#include <stdint.h>
-#include <wayland-client.h>
-#include "backend/wayland.h"
-#include "common/log.h"
-
-static void wl_output_handle_mode(void *data, struct wl_output *wl_output,
-		     uint32_t flags, int32_t width, int32_t height, int32_t refresh) {
-	struct wlr_wl_output *output = data;
-	assert(output->wl_output == wl_output);
-	struct wlr_wl_output_mode *mode;
-	if (!(mode = calloc(sizeof(struct wlr_wl_output_mode), 1))) {
-		wlr_log(L_ERROR, "Failed to allocate wlr_wl_output_mode");
-		return;
-	}
-	mode->flags = flags;
-	mode->width = width;
-	mode->height = height;
-	mode->refresh = refresh;
-	list_add(output->modes, mode);
-	wlr_log(L_DEBUG, "Got mode for output %p: %dx%d @ %.2fHz%s%s",
-			wl_output, width, height, refresh / 1000.0,
-			(flags & WL_OUTPUT_MODE_PREFERRED) ? " (preferred)" : "",
-			(flags & WL_OUTPUT_MODE_CURRENT) ? " (current)" : "");
-}
-
-static void wl_output_handle_geometry(void *data, struct wl_output *wl_output,
-			 int32_t x, int32_t y, int32_t physical_width, int32_t physical_height,
-			 int32_t subpixel, const char *make, const char *model, int32_t transform) {
-	struct wlr_wl_output *output = data;
-	assert(output->wl_output == wl_output);
-	output->x = x;
-	output->y = y;
-	output->phys_width = physical_width;
-	output->phys_height = physical_height;
-	output->subpixel = subpixel;
-	output->make = strdup(make);
-	output->model = strdup(model);
-	output->transform = transform;
-	wlr_log(L_DEBUG, "Got info for output %p %dx%d (%dmm x %dmm) %s %s",
-			wl_output, (int)x, (int)y, (int)physical_width, (int)physical_height,
-			make, model);
-}
-
-static void wl_output_handle_scale(void *data, struct wl_output *wl_output, int32_t factor) {
-	struct wlr_wl_output *output = data;
-	assert(output->wl_output == wl_output);
-	output->scale = factor;
-	wlr_log(L_DEBUG, "Got scale factor for output %p: %d", wl_output, factor);
-}
-
-static void wl_output_handle_done(void *data, struct wl_output *wl_output) {
-	// TODO: notify of changes? Probably not necessary for this backend
-}
-
-const struct wl_output_listener output_listener = {
-	.mode = wl_output_handle_mode,
-	.geometry = wl_output_handle_geometry,
-	.scale = wl_output_handle_scale,
-	.done = wl_output_handle_done
-};

backend/wayland/wl_seat.c

@@ -4,49 +4,89 @@
 #include <stdint.h>
 #include <string.h>
 #include <wayland-client.h>
+#include <wlr/types.h>
+#include "types.h"
 #include "backend/wayland.h"
 #include "common/log.h"
 
+static void wlr_wl_device_destroy(struct wlr_input_device_state *state) {
+	free(state);
+}
+
+static struct wlr_input_device_impl input_device_impl = {
+	.destroy = wlr_wl_device_destroy
+};
+
+static struct wlr_input_device *allocate_device(struct wlr_backend_state *state,
+		enum wlr_input_device_type type) {
+	struct wlr_input_device_state *devstate =
+		calloc(1, sizeof(struct wlr_input_device_state));
+	if(!devstate) {
+		wlr_log(L_ERROR, "Allocation failed: %s", strerror(errno));
+		return NULL;
+	}
+
+	// TODO: any way to retrieve those information?
+	int vendor = 0;
+	int product = 0;
+	const char *name = "unknown;wayland";
+	struct wlr_input_device *wlr_device = wlr_input_device_create(
+		type, &input_device_impl, devstate,
+		name, vendor, product);
+	if(!wlr_device) {
+		free(devstate);
+		return NULL;
+	}
+
+	list_add(state->devices, wlr_device);
+	return wlr_device;
+}
+
 static void seat_handle_capabilities(void *data, struct wl_seat *wl_seat,
 		enum wl_seat_capability caps) {
-	struct wlr_wl_seat *seat = data;
+	struct wlr_backend_state *state = data;
-	assert(seat->wl_seat == wl_seat);
+	assert(state->seat == wl_seat);
-	struct wlr_wl_backend *backend = wl_seat_get_user_data(wl_seat);
-	assert(backend);
 
+	// TODO: add listeners and receive input
 	if ((caps & WL_SEAT_CAPABILITY_POINTER)) {
 		wlr_log(L_DEBUG, "seat %p offered pointer", wl_seat);
 		struct wl_pointer *wl_pointer = wl_seat_get_pointer(wl_seat);
-		struct wlr_wl_pointer *pointer;
+
-		if (!(pointer = calloc(sizeof(struct wlr_wl_pointer), 1))) {
+		struct wlr_input_device *wlr_device = allocate_device(state,
+			WLR_INPUT_DEVICE_POINTER);
+		if(!wlr_device) {
 			wl_pointer_destroy(wl_pointer);
-			wlr_log(L_ERROR, "Unable to allocate wlr_wl_pointer");
+			wlr_log(L_ERROR, "Unable to allocate wl_pointer device");
 			return;
 		}
-		pointer->wl_pointer = wl_pointer;
-		//wl_pointer_add_listener(wl_pointer, &pointer_listener, backend->registry); TODO
-	}
 
+		wlr_device->pointer = wlr_pointer_create(NULL, NULL);
+		list_add(state->devices, wlr_device);
+		wl_signal_emit(&state->backend->events.input_add, wlr_device);
+	}
 	if ((caps & WL_SEAT_CAPABILITY_KEYBOARD)) {
 		wlr_log(L_DEBUG, "seat %p offered keyboard", wl_seat);
 		struct wl_keyboard *wl_keyboard = wl_seat_get_keyboard(wl_seat);
-		struct wlr_wl_keyboard *keyboard;
+		struct wlr_input_device *wlr_device = allocate_device(state,
-		if (!(keyboard = calloc(sizeof(struct wlr_wl_pointer), 1))) {
+			WLR_INPUT_DEVICE_KEYBOARD);
-			wl_keyboard_destroy(wl_keyboard);
+		if(!wlr_device) {
-			wlr_log(L_ERROR, "Unable to allocate wlr_wl_keyboard");
+			wl_keyboard_release(wl_keyboard);
+			wlr_log(L_ERROR, "Unable to allocate wl_pointer device");
 			return;
 		}
-		keyboard->wl_keyboard = wl_keyboard;
+
-		//wl_keyboard_add_listener(wl_keyboard, &keyboard_listener, backend->registry); TODO
+		wlr_device->keyboard = wlr_keyboard_create(NULL, NULL);
+		list_add(state->devices, wlr_device);
+		wl_signal_emit(&state->backend->events.input_add, wlr_device);
 	}
 
 	// TODO: touch
 }
 
 static void seat_handle_name(void *data, struct wl_seat *wl_seat, const char *name) {
-	struct wlr_wl_seat *seat = data;
+	struct wlr_backend_state *state = data;
-	assert(seat->wl_seat == wl_seat);
+	assert(state->seat == wl_seat);
-	seat->name = strdup(name);
+	state->seatName = strdup(name);
 }
 
 const struct wl_seat_listener seat_listener = {

example/pointer.c

@@ -110,22 +110,21 @@ int main(int argc, char *argv[]) {
 		.default_color = { 0.25f, 0.25f, 0.25f, 1 },
 		.clear_color = { 0.25f, 0.25f, 0.25f, 1 }
 	};
-	struct compositor_state compositor;
+	struct compositor_state compositor = { 0 };
-
+	compositor.data = &state;
-	compositor_init(&compositor);
 	compositor.output_add_cb = handle_output_add;
 	compositor.output_frame_cb = handle_output_frame;
 	compositor.keyboard_key_cb = handle_keyboard_key;
 	compositor.pointer_motion_cb = handle_pointer_motion;
 	compositor.pointer_button_cb = handle_pointer_button;
 	compositor.pointer_axis_cb = handle_pointer_axis;
+	compositor_init(&compositor);
 
 	state.renderer = wlr_gles3_renderer_init();
 	state.cat_texture = wlr_render_surface_init(state.renderer);
 	wlr_surface_attach_pixels(state.cat_texture, GL_RGBA,
 		cat_tex.width, cat_tex.height, cat_tex.pixel_data);
 
-	compositor.data = &state;
 	compositor_run(&compositor);
 
 	wlr_surface_destroy(state.cat_texture);

example/rotation.c

@@ -4,6 +4,7 @@
 #include <stdlib.h>
 #include <time.h>
 #include <string.h>
+#include <strings.h>
 #include <unistd.h>
 #include <wayland-server.h>
 #include <wayland-server-protocol.h>
@@ -193,22 +194,22 @@ static void parse_args(int argc, char *argv[], struct wl_list *config) {
 
 int main(int argc, char *argv[]) {
 	struct sample_state state = { 0 };
-	struct compositor_state compositor;
 	wl_list_init(&state.config);
 	parse_args(argc, argv, &state.config);
 
-	compositor_init(&compositor);
+	struct compositor_state compositor = { 0 };
+	compositor.data = &state;
 	compositor.output_add_cb = handle_output_add;
 	compositor.output_remove_cb = handle_output_remove;
 	compositor.output_frame_cb = handle_output_frame;
 	compositor.keyboard_key_cb = handle_keyboard_key;
+	compositor_init(&compositor);
 
 	state.renderer = wlr_gles3_renderer_init();
 	state.cat_texture = wlr_render_surface_init(state.renderer);
 	wlr_surface_attach_pixels(state.cat_texture, GL_RGBA,
 		cat_tex.width, cat_tex.height, cat_tex.pixel_data);
 
-	compositor.data = &state;
 	compositor_run(&compositor);
 
 	wlr_surface_destroy(state.cat_texture);

example/shared.c

@@ -383,7 +383,9 @@ static void output_add_notify(struct wl_listener *listener, void *data) {
 	fprintf(stderr, "Output '%s' added\n", output->name);
 	fprintf(stderr, "%s %s %"PRId32"mm x %"PRId32"mm\n", output->make, output->model,
 		output->phys_width, output->phys_height);
+	if (output->modes->length > 0) {
 		wlr_output_set_mode(output, output->modes->items[0]);
+	}
 	struct output_state *ostate = calloc(1, sizeof(struct output_state));
 	clock_gettime(CLOCK_MONOTONIC, &ostate->last_frame);
 	ostate->output = output;
@@ -418,8 +420,6 @@ static void output_remove_notify(struct wl_listener *listener, void *data) {
 }
 
 void compositor_init(struct compositor_state *state) {
-	memset(state, 0, sizeof(struct compositor_state));
-
 	state->display = wl_display_create();
 	state->event_loop = wl_display_get_event_loop(state->display);
 	state->session = wlr_session_start(state->display);
@@ -457,14 +457,14 @@ void compositor_init(struct compositor_state *state) {
 	state->backend = wlr;
 
 	clock_gettime(CLOCK_MONOTONIC, &state->last_frame);
-}
 
-void compositor_run(struct compositor_state *state) {
 	if (!wlr_backend_init(state->backend)) {
 		fprintf(stderr, "Failed to initialize backend\n");
 		exit(1);
 	}
+}
 
+void compositor_run(struct compositor_state *state) {
 	while (!state->exit) {
 		wl_event_loop_dispatch(state->event_loop, 0);
 	}

example/simple.c

@@ -50,11 +50,11 @@ int main() {
 		.color = { 1.0, 0.0, 0.0 },
 		.dec = 0,
 	};
-	struct compositor_state compositor;
+	struct compositor_state compositor = { 0,
-
+		.data = &state,
+		.output_frame_cb = handle_output_frame,
+		.keyboard_key_cb = handle_keyboard_key,
+	};
 	compositor_init(&compositor);
-	compositor.output_frame_cb = handle_output_frame;
-	compositor.keyboard_key_cb = handle_keyboard_key;
-	compositor.data = &state;
 	compositor_run(&compositor);
 }

example/tablet.c

@@ -145,19 +145,19 @@ int main(int argc, char *argv[]) {
 		.tool_color = { 1, 1, 1, 1 },
 		.pad_color = { 0.75, 0.75, 0.75, 1.0 }
 	};
-	struct compositor_state compositor;
+	struct compositor_state compositor = { 0,
-
+		.data = &state,
+		.output_frame_cb = handle_output_frame,
+		.keyboard_key_cb = handle_keyboard_key,
+		.tool_axis_cb = handle_tool_axis,
+		.tool_proximity_cb = handle_tool_proximity,
+		.tool_button_cb = handle_tool_button,
+		.pad_button_cb = handle_pad_button,
+	};
 	compositor_init(&compositor);
-	compositor.output_frame_cb = handle_output_frame;
-	compositor.keyboard_key_cb = handle_keyboard_key;
-	compositor.tool_axis_cb = handle_tool_axis;
-	compositor.tool_proximity_cb = handle_tool_proximity;
-	compositor.tool_button_cb = handle_tool_button;
-	compositor.pad_button_cb = handle_pad_button;
 
 	state.renderer = wlr_gles3_renderer_init();
 
-	compositor.data = &state;
 	compositor_run(&compositor);
 
 	wlr_renderer_destroy(state.renderer);

example/touch.c

@@ -100,21 +100,21 @@ int main(int argc, char *argv[]) {
 	struct sample_state state = {
 		.touch_points = list_create()
 	};
-	struct compositor_state compositor;
+	struct compositor_state compositor = { 0,
-
+		.data = &state,
+		.output_frame_cb = handle_output_frame,
+		.keyboard_key_cb = handle_keyboard_key,
+		.touch_down_cb = handle_touch_down,
+		.touch_up_cb = handle_touch_up,
+		.touch_motion_cb = handle_touch_motion,
+	};
 	compositor_init(&compositor);
-	compositor.output_frame_cb = handle_output_frame;
-	compositor.keyboard_key_cb = handle_keyboard_key;
-	compositor.touch_down_cb = handle_touch_down;
-	compositor.touch_up_cb = handle_touch_up;
-	compositor.touch_motion_cb = handle_touch_motion;
 
 	state.renderer = wlr_gles3_renderer_init();
 	state.cat_texture = wlr_render_surface_init(state.renderer);
 	wlr_surface_attach_pixels(state.cat_texture, GL_RGBA,
 		cat_tex.width, cat_tex.height, cat_tex.pixel_data);
 
-	compositor.data = &state;
 	compositor_run(&compositor);
 
 	wlr_surface_destroy(state.cat_texture);

include/backend/egl.h

@@ -10,6 +10,7 @@ struct wlr_egl {
 	EGLContext context;
 };
 
+const char *egl_error(void);
 bool wlr_egl_init(struct wlr_egl *egl, EGLenum platform, void *display);
 void wlr_egl_free(struct wlr_egl *egl);
 EGLSurface wlr_egl_create_surface(struct wlr_egl *egl, void *window);

include/backend/wayland.h

@@ -3,10 +3,12 @@
 
 #include <wayland-client.h>
 #include <wayland-server.h>
+#include <wayland-egl.h>
 #include <wlr/common/list.h>
-#include <wlr/wayland.h>
+#include <wlr/backend/wayland.h>
+#include "backend/egl.h"
 
-struct wlr_wl_backend {
+struct wlr_backend_state {
 	/* local state */
 	struct wl_display *local_display;
 	/* remote state */
@@ -15,13 +17,39 @@ struct wlr_wl_backend {
 	struct wl_compositor *compositor;
 	struct wl_shell *shell;
 	struct wl_shm *shm;
-	struct wlr_wl_seat *seat;
+	struct wl_seat *seat;
-	list_t *outputs;
+	const char *seatName;
+
+	struct wlr_backend *backend;
+	list_t *devices;
+
+	struct wl_event_source* remote_display_src;
+
+	size_t num_outputs;
+	struct wlr_output **outputs;
+	struct wlr_egl egl;
 };
 
-void wlr_wlb_registry_poll(struct wlr_wl_backend *backend);
+struct wlr_output_state {
+	size_t id;
+	struct wlr_backend_state *backend;
+	struct wlr_output *output;
+	struct wl_surface *surface;
+	struct wl_shell_surface *shell_surface;
+	struct wl_egl_window* egl_window;
+	struct wl_callback* frame_callback;
+	void* egl_surface;
+};
+
+struct wlr_input_device_state {
+	enum wlr_input_device_type type;
+	void *resource;
+};
+
+void wlr_wl_registry_poll(struct wlr_backend_state *backend);
+struct wlr_output *wlr_wl_output_create(struct wlr_backend_state* backend,
+		size_t id);
 
 extern const struct wl_seat_listener seat_listener;
-extern const struct wl_output_listener output_listener;
 
 #endif

include/types.h

@@ -20,6 +20,7 @@ struct wlr_output_impl {
 struct wlr_output *wlr_output_create(struct wlr_output_impl *impl,
 		struct wlr_output_state *state);
 void wlr_output_free(struct wlr_output *output);
+void wlr_output_update_matrix(struct wlr_output *output);
 
 struct wlr_keyboard_impl {
 	void (*destroy)(struct wlr_keyboard_state *state);

include/wlr/backend/wayland.h

@@ -1,14 +1,11 @@
-#ifndef _WLR_BACKEND_WAYLAND_INTERNAL_H
+#ifndef WLR_BACKEND_WAYLAND_H
-#define _WLR_BACKEND_WAYLAND_INTERNAL_H
+#define WLR_BACKEND_WAYLAND_H
 
 #include <wayland-client.h>
 #include <wayland-server.h>
-#include <wlr/wayland.h>
+#include <wlr/backend.h>
 
-struct wlr_wl_backend;
+struct wlr_backend *wlr_wl_backend_create(struct wl_display *display,
-
-void wlr_wl_backend_free(struct wlr_wl_backend *backend);
-struct wlr_wl_backend *wlr_wl_backend_init(struct wl_display *display,
 		size_t outputs);
 
 #endif

include/wlr/types.h

@@ -33,11 +33,13 @@ struct wlr_output {
 
 	float transform_matrix[16];
 
+	/* Note: some backends may have zero modes */
 	list_t *modes;
 	struct wlr_output_mode *current_mode;
 
 	struct {
 		struct wl_signal frame;
+		struct wl_signal resolution;
 	} events;
 };
 

render/gles3/renderer.c

@@ -71,6 +71,7 @@ static void init_default_shaders() {
 	if (!compile_program(quad_vertex_src, ellipse_fragment_src, &shaders.ellipse)) {
 		goto error;
 	}
+	wlr_log(L_DEBUG, "Compiled default shaders");
 	return;
 error:
 	wlr_log(L_ERROR, "Failed to set up default shaders!");
@@ -141,8 +142,10 @@ static bool wlr_gles3_render_surface(struct wlr_renderer_state *state,
 		GL_CALL(glUseProgram(shaders.rgba));
 		break;
 	default:
+		wlr_log(L_ERROR, "No shader for this surface format");
 		return false;
 	}
+	gles3_flush_errors();
 	GL_CALL(glBindVertexArray(vao));
 	GL_CALL(glBindBuffer(GL_ARRAY_BUFFER, vbo));
 	GL_CALL(glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo));

types/wlr_output.c

@@ -65,6 +65,10 @@ static void set_matrix(float mat[static 16], int32_t width, int32_t height,
 	mat[15] = 1.0f;
 }
 
+void wlr_output_update_matrix(struct wlr_output *output) {
+	set_matrix(output->transform_matrix, output->width, output->height, output->transform);
+}
+
 struct wlr_output *wlr_output_create(struct wlr_output_impl *impl,
 		struct wlr_output_state *state) {
 	struct wlr_output *output = calloc(1, sizeof(struct wlr_output));
@@ -73,6 +77,7 @@ struct wlr_output *wlr_output_create(struct wlr_output_impl *impl,
 	output->modes = list_create();
 	output->transform = WL_OUTPUT_TRANSFORM_NORMAL;
 	wl_signal_init(&output->events.frame);
+	wl_signal_init(&output->events.resolution);
 	return output;
 }
 
@@ -81,22 +86,31 @@ void wlr_output_enable(struct wlr_output *output, bool enable) {
 }
 
 bool wlr_output_set_mode(struct wlr_output *output, struct wlr_output_mode *mode) {
-	set_matrix(output->transform_matrix, mode->width, mode->height, output->transform);
+	if (!output->impl || !output->impl->set_mode) {
+		return false;
+	}
+	wlr_output_update_matrix(output);
 	return output->impl->set_mode(output->state, mode);
 }
 
 void wlr_output_transform(struct wlr_output *output,
 		enum wl_output_transform transform) {
-	set_matrix(output->transform_matrix, output->width, output->height, transform);
+	wlr_output_update_matrix(output);
 	output->impl->transform(output->state, transform);
 }
 
 bool wlr_output_set_cursor(struct wlr_output *output,
 		const uint8_t *buf, int32_t stride, uint32_t width, uint32_t height) {
+	if (!output->impl || !output->impl->set_cursor) {
+		return false;
+	}
 	return output->impl->set_cursor(output->state, buf, stride, width, height);
 }
 
 bool wlr_output_move_cursor(struct wlr_output *output, int x, int y) {
+	if (!output->impl || !output->impl->move_cursor) {
+		return false;
+	}
 	return output->impl->move_cursor(output->state, x, y);
 }