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From: Gabriel Valcazar <gabriel.valcazar@digi.com>
Date: Mon, 6 Nov 2023 13:45:27 +0100
Subject: [PATCH] Make demo compatible with any backend
Apply changes so the demo builds and runs with any of the 4 major backends
(wayland, sdl, drm and fbdev)
Signed-off-by: Gabriel Valcazar <gabriel.valcazar@digi.com>
---
main.c | 142 +++++++++++++++++++++++++++++++++++++++++++++++++++------
1 file changed, 128 insertions(+), 14 deletions(-)
diff --git a/main.c b/main.c
index 33cd734..bb0248a 100644
--- a/main.c
+++ b/main.c
@@ -1,12 +1,23 @@
#include "lvgl/lvgl.h"
#include "lvgl/demos/lv_demos.h"
#include "lv_drivers/display/fbdev.h"
+#include "lv_drivers/display/drm.h"
#include "lv_drivers/indev/evdev.h"
+#include "lv_drivers/sdl/sdl.h"
+#include "lv_drivers/wayland/wayland.h"
+
+#if USE_SDL
+#define SDL_MAIN_HANDLED /*To fix SDL's "undefined reference to WinMain" issue*/
+#include <SDL2/SDL.h>
+#endif
+
#include <unistd.h>
#include <pthread.h>
#include <time.h>
#include <sys/time.h>
+static void backend_init(void);
+
#define DISP_BUF_SIZE (128 * 1024)
int main(void)
@@ -14,8 +25,78 @@ int main(void)
/*LittlevGL init*/
lv_init();
- /*Linux frame buffer device init*/
- fbdev_init();
+ backend_init();
+
+ /*Create a Demo*/
+ lv_demo_widgets();
+
+ /*Handle LitlevGL tasks (tickless mode)*/
+ while(1) {
+ lv_timer_handler();
+ usleep(5000);
+ }
+
+ return 0;
+}
+
+static void backend_init(void)
+{
+#if USE_WAYLAND
+ lv_wayland_init();
+
+ /* Create a display */
+ lv_disp_t * disp = lv_wayland_create_window(800, 480, "lvgl wayland demo", NULL /*close_cb*/);
+#elif USE_SDL
+ sdl_init();
+
+ /*A small buffer for LittlevGL to draw the screen's content*/
+ static lv_color_t buf[SDL_HOR_RES * 100];
+
+ /*Initialize a descriptor for the buffer*/
+ static lv_disp_draw_buf_t disp_buf;
+ lv_disp_draw_buf_init(&disp_buf, buf, NULL, SDL_HOR_RES * 100);
+
+ /*Initialize and register a display driver*/
+ static lv_disp_drv_t disp_drv;
+ lv_disp_drv_init(&disp_drv);
+ disp_drv.draw_buf = &disp_buf;
+ disp_drv.flush_cb = sdl_display_flush;
+ disp_drv.hor_res = SDL_HOR_RES;
+ disp_drv.ver_res = SDL_VER_RES;
+ lv_disp_drv_register(&disp_drv);
+
+ lv_group_t * g = lv_group_create();
+ lv_group_set_default(g);
+
+ static lv_indev_drv_t indev_drv_1;
+ lv_indev_drv_init(&indev_drv_1); /*Basic initialization*/
+ indev_drv_1.type = LV_INDEV_TYPE_POINTER;
+
+ /*This function will be called periodically (by the library) to get the mouse position and state*/
+ indev_drv_1.read_cb = sdl_mouse_read;
+ lv_indev_t *mouse_indev = lv_indev_drv_register(&indev_drv_1);
+
+ /*Set a cursor for the mouse*/
+ LV_IMG_DECLARE(mouse_cursor_icon)
+ lv_obj_t * cursor_obj = lv_img_create(lv_scr_act()); /*Create an image object for the cursor */
+ lv_img_set_src(cursor_obj, &mouse_cursor_icon); /*Set the image source*/
+ lv_indev_set_cursor(mouse_indev, cursor_obj); /*Connect the image object to the driver*/
+
+ static lv_indev_drv_t indev_drv_2;
+ lv_indev_drv_init(&indev_drv_2); /*Basic initialization*/
+ indev_drv_2.type = LV_INDEV_TYPE_KEYPAD;
+ indev_drv_2.read_cb = sdl_keyboard_read;
+ lv_indev_t *kb_indev = lv_indev_drv_register(&indev_drv_2);
+ lv_indev_set_group(kb_indev, g);
+
+ static lv_indev_drv_t indev_drv_3;
+ lv_indev_drv_init(&indev_drv_3); /*Basic initialization*/
+ indev_drv_3.type = LV_INDEV_TYPE_ENCODER;
+ indev_drv_3.read_cb = sdl_mousewheel_read;
+ lv_indev_t * enc_indev = lv_indev_drv_register(&indev_drv_3);
+ lv_indev_set_group(enc_indev, g);
+#elif USE_DRM
+ drm_init();
/*A small buffer for LittlevGL to draw the screen's content*/
static lv_color_t buf[DISP_BUF_SIZE];
@@ -28,12 +109,20 @@ int main(void)
static lv_disp_drv_t disp_drv;
lv_disp_drv_init(&disp_drv);
disp_drv.draw_buf = &disp_buf;
- disp_drv.flush_cb = fbdev_flush;
- disp_drv.hor_res = 800;
- disp_drv.ver_res = 480;
+ disp_drv.flush_cb = drm_flush;
+ lv_coord_t drm_width, drm_height;
+ /* get size from DRM/KMS backend */
+ uint32_t drm_dpi;
+ drm_get_sizes(&drm_width, &drm_height, &drm_dpi);
+ disp_drv.hor_res = drm_width;
+ disp_drv.ver_res = drm_height;
lv_disp_drv_register(&disp_drv);
evdev_init();
+
+ lv_group_t * g = lv_group_create();
+ lv_group_set_default(g);
+
static lv_indev_drv_t indev_drv_1;
lv_indev_drv_init(&indev_drv_1); /*Basic initialization*/
indev_drv_1.type = LV_INDEV_TYPE_POINTER;
@@ -42,24 +131,49 @@ int main(void)
indev_drv_1.read_cb = evdev_read;
lv_indev_t *mouse_indev = lv_indev_drv_register(&indev_drv_1);
-
/*Set a cursor for the mouse*/
LV_IMG_DECLARE(mouse_cursor_icon)
lv_obj_t * cursor_obj = lv_img_create(lv_scr_act()); /*Create an image object for the cursor */
lv_img_set_src(cursor_obj, &mouse_cursor_icon); /*Set the image source*/
lv_indev_set_cursor(mouse_indev, cursor_obj); /*Connect the image object to the driver*/
+#elif USE_FBDEV
+ fbdev_init();
+ /*A small buffer for LittlevGL to draw the screen's content*/
+ static lv_color_t buf[DISP_BUF_SIZE];
- /*Create a Demo*/
- lv_demo_widgets();
+ /*Initialize a descriptor for the buffer*/
+ static lv_disp_draw_buf_t disp_buf;
+ lv_disp_draw_buf_init(&disp_buf, buf, NULL, DISP_BUF_SIZE);
- /*Handle LitlevGL tasks (tickless mode)*/
- while(1) {
- lv_timer_handler();
- usleep(5000);
- }
+ /*Initialize and register a display driver*/
+ static lv_disp_drv_t disp_drv;
+ lv_disp_drv_init(&disp_drv);
+ disp_drv.draw_buf = &disp_buf;
+ disp_drv.flush_cb = fbdev_flush;
+ disp_drv.hor_res = 800;
+ disp_drv.ver_res = 480;
+ lv_disp_drv_register(&disp_drv);
- return 0;
+ evdev_init();
+
+ lv_group_t * g = lv_group_create();
+ lv_group_set_default(g);
+
+ static lv_indev_drv_t indev_drv_1;
+ lv_indev_drv_init(&indev_drv_1); /*Basic initialization*/
+ indev_drv_1.type = LV_INDEV_TYPE_POINTER;
+
+ /*This function will be called periodically (by the library) to get the mouse position and state*/
+ indev_drv_1.read_cb = evdev_read;
+ lv_indev_t *mouse_indev = lv_indev_drv_register(&indev_drv_1);
+
+ /*Set a cursor for the mouse*/
+ LV_IMG_DECLARE(mouse_cursor_icon)
+ lv_obj_t * cursor_obj = lv_img_create(lv_scr_act()); /*Create an image object for the cursor */
+ lv_img_set_src(cursor_obj, &mouse_cursor_icon); /*Set the image source*/
+ lv_indev_set_cursor(mouse_indev, cursor_obj); /*Connect the image object to the driver*/
+#endif
}
/*Set in lv_conf.h as `LV_TICK_CUSTOM_SYS_TIME_EXPR`*/
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