Implement LVGL with SDL for simulator (#16)

* Implemented LVGL with SDL for simulator

* cleanup

* added SDL to build

* build fix

* mutex fixes

* sim app cleanup and improvements

* docs updated

* fix for sdl?

* fix for SDL cmake setup

libs/lv_drivers/wayland/wayland.h

@@ -0,0 +1,77 @@
+/**
+ * @file wayland
+ *
+ */
+
+#ifndef WAYLAND_H
+#define WAYLAND_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+#ifndef LV_DRV_NO_CONF
+#ifdef LV_CONF_INCLUDE_SIMPLE
+#include "lv_drv_conf.h"
+#else
+#include "../../lv_drv_conf.h"
+#endif
+#endif
+
+#if USE_WAYLAND
+
+#ifdef LV_LVGL_H_INCLUDE_SIMPLE
+#include "lvgl.h"
+#else
+#include "lvgl/lvgl.h"
+#endif
+
+#if LV_USE_USER_DATA == 0
+#error "Support for user data is required by wayland driver. Set LV_USE_USER_DATA to 1 in lv_conf.h"
+#endif
+
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+typedef bool (*lv_wayland_display_close_f_t)(lv_disp_t * disp);
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+void lv_wayland_init(void);
+void lv_wayland_deinit(void);
+int lv_wayland_get_fd(void);
+lv_disp_t * lv_wayland_create_window(lv_coord_t hor_res, lv_coord_t ver_res, char *title,
+                                     lv_wayland_display_close_f_t close_cb);
+void lv_wayland_close_window(lv_disp_t * disp);
+bool lv_wayland_window_is_open(lv_disp_t * disp);
+bool lv_wayland_window_is_flush_pending(lv_disp_t * disp);
+void lv_wayland_window_set_fullscreen(lv_disp_t * disp, bool fullscreen);
+lv_indev_t * lv_wayland_get_pointer(lv_disp_t * disp);
+lv_indev_t * lv_wayland_get_pointeraxis(lv_disp_t * disp);
+lv_indev_t * lv_wayland_get_keyboard(lv_disp_t * disp);
+lv_indev_t * lv_wayland_get_touchscreen(lv_disp_t * disp);
+#ifdef LV_WAYLAND_TIMER_HANDLER
+uint32_t lv_wayland_timer_handler(void);
+#endif
+
+/**********************
+ *      MACROS
+ **********************/
+
+#endif /* USE_WAYLAND */
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /* WAYLAND_H */