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|
===============================
OpenGL ES Display/Inputs driver
===============================
Overview
--------
| The **OpenGL ES** display/input `driver <https://github.com/lvgl/lvgl/src/drivers/opengles>`__ offers support for simulating the LVGL display and keyboard/mouse inputs in an desktop window created via GLFW.
| It is an alternative to **Wayland**, **XCB**, **SDL** or **Qt**.
The main purpose for this driver is for testing/debugging the LVGL application in an **OpenGL** simulation window.
Prerequisites
-------------
The OpenGL driver uses GLEW GLFW to access the OpenGL window manager.
1. Install GLEW and GLFW: ``sudo apt-get install libglew-dev libglfw3-dev``
Configure OpenGL driver
-----------------------
1. Required linked libraries: -lGL -lGLEW -lglfw
2. Enable the OpenGL driver support in lv_conf.h, by cmake compiler define or by KConfig
.. code:: c
#define LV_USE_OPENGLES 1
Usage
-----
.. code:: c
#include "lvgl/lvgl.h"
#include "lvgl/examples/lv_examples.h"
#include "lvgl/demos/lv_demos.h"
int main()
{
lv_init();
lv_display_t * disp = lv_glfw_window_create(480, 272);
lv_indev_t * mouse = lv_glfw_mouse_create();
lv_indev_set_group(mouse, lv_group_get_default());
lv_indev_set_display(mouse, disp);
lv_display_set_default(disp);
LV_IMAGE_DECLARE(mouse_cursor_icon); /*Declare the image file.*/
lv_obj_t * cursor_obj;
cursor_obj = lv_image_create(lv_screen_active()); /*Create an image object for the cursor */
lv_image_set_src(cursor_obj, &mouse_cursor_icon); /*Set the image source*/
lv_indev_set_cursor(mouse, cursor_obj); /*Connect the image object to the driver*/
lv_demo_widgets();
while (1)
{
uint32_t time_till_next = lv_timer_handler();
lv_delay_ms(time_till_next);
}
return 0;
}
|
