Move example -> examples

And the compositor example into its own directory

examples/compositor/main.c

@@ -0,0 +1,42 @@
+#define _POSIX_C_SOURCE 199309L
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <inttypes.h>
+#include <wayland-server.h>
+#include <wlr/backend.h>
+#include <wlr/session.h>
+#include <wlr/render.h>
+#include <wlr/render/gles2.h>
+#include <wlr/types/wlr_output.h>
+#include <xkbcommon/xkbcommon.h>
+#include "shared.h"
+
+struct sample_state {
+	struct wlr_renderer *renderer;
+};
+
+void handle_output_frame(struct output_state *output, struct timespec *ts) {
+	struct compositor_state *state = output->compositor;
+	struct sample_state *sample = state->data;
+	struct wlr_output *wlr_output = output->output;
+
+	wlr_renderer_begin(sample->renderer, wlr_output);
+	// TODO: render surfaces
+	wlr_renderer_end(sample->renderer);
+}
+
+int main() {
+	struct sample_state state = { 0 };
+	struct compositor_state compositor = { 0,
+		.data = &state,
+		.output_frame_cb = handle_output_frame,
+	};
+	compositor_init(&compositor);
+
+	state.renderer = wlr_gles2_renderer_init();
+	wl_display_init_shm(compositor.display);
+
+	compositor_run(&compositor);
+}