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/registry.c
-    #wayland/wl_seat.c
-    #wayland/wl_output.c
-
+    wayland/backend.c
+    wayland/registry.c
+    wayland/wl_seat.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";
@@ -68,24 +68,31 @@ 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;
 	}
 
 	EGLConfig configs[count];
 
 	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;
 }
 
@@ -109,7 +117,7 @@ bool wlr_egl_init(struct wlr_egl *egl, EGLenum platform, void *display) {
 	if (!egl_exts()) {
 		return false;
 	}
-	
+
 	if (eglBindAPI(EGL_OPENGL_ES_API) == EGL_FALSE) {
 		wlr_log(L_ERROR, "Failed to bind to the OpenGL ES API: %s", egl_error());
 		goto error;
@@ -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;
 	}
@@ -163,7 +171,7 @@ void wlr_egl_free(struct wlr_egl *egl) {
 	eglDestroyContext(egl->display, egl->context);
 	eglTerminate(egl->display);
 	eglReleaseThread();
-	eglMakeCurrent(EGL_NO_DISPLAY, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);	
+	eglMakeCurrent(EGL_NO_DISPLAY, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
 }
 
 EGLSurface wlr_egl_create_surface(struct wlr_egl *egl, void *window) {

backend/wayland/backend.c

@@ -2,58 +2,145 @@
 #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) {
-	if (!backend) {
-		return;
+static int dispatch_events(int fd, uint32_t mask, void *data) {
+	struct wlr_backend_state *state = data;
+	int count = 0;
+	if (mask & WL_EVENT_READABLE) {
+		count = wl_display_dispatch(state->remote_display);
 	}
-	// TODO: Free surfaces
-	for (size_t i = 0; backend->outputs && i < backend->outputs->length; ++i) {
-		struct wlr_wl_output *output = backend->outputs->items[i];
-		wlr_wl_output_free(output);
-	}
-	list_free(backend->outputs);
-	if (backend->seat) wlr_wl_seat_free(backend->seat);
-	if (backend->shm) wl_shm_destroy(backend->shm);
-	if (backend->shell) wl_shell_destroy(backend->shell);
-	if (backend->compositor) wl_compositor_destroy(backend->compositor);
-	if (backend->registry) wl_registry_destroy(backend->registry);
-	if (backend->remote_display) wl_display_disconnect(backend->remote_display);
-	free(backend);
+	if (mask & WL_EVENT_WRITABLE) {
+		count = wl_display_flush(state->remote_display);
+	}
+	if (mask == 0) {
+		count = wl_display_dispatch_pending(state->remote_display);
+		wl_display_flush(state->remote_display);
+	}
+	return count;
 }
 
 /*
  * Initializes the wayland backend. Opens a connection to a remote wayland
  * compositor and creates surfaces for each output, then registers globals on
  * the specified display.
  */
-struct wlr_wl_backend *wlr_wl_backend_init(
-		struct wl_display *display, size_t outputs) {
-	assert(display);
-	struct wlr_wl_backend *backend;
-	if (!(backend = calloc(sizeof(struct wlr_wl_backend), 1))) {
-		wlr_log(L_ERROR, "Could not allocate backend");
-		goto error;
+static bool wlr_wl_backend_init(struct wlr_backend_state* state) {
+	wlr_log(L_INFO, "Initializating wayland backend");
+
+	state->remote_display = wl_display_connect(getenv("_WAYLAND_DISPLAY"));
+	if (!state->remote_display) {
+		wlr_log_errno(L_ERROR, "Could not connect to remote display");
+		return false;
 	}
-	if (!(backend->outputs = list_create())) {
-		wlr_log(L_ERROR, "Could not allocate output list");
-		goto error;
+
+	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]);
 	}
-	backend->local_display = display;
-	backend->remote_display = wl_display_connect(getenv("_WAYLAND_DISPLAY"));
-	if (!backend->remote_display) {
-		wlr_log(L_ERROR, "Could not connect to remote display");
+
+	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->registry = wl_display_get_registry(backend->remote_display))) {
-		wlr_log(L_ERROR, "Could not obtain reference to remote registry");
+
+	if (!(state->outputs = calloc(sizeof(void*), num_outputs))) {
+		wlr_log(L_ERROR, "Could not allocate outputs list");
 		goto error;
 	}
-	wlr_wlb_registry_poll(backend);
+
+	state->local_display = display;
+	state->backend = backend;
+	state->num_outputs = num_outputs;
+
 	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;
 }