feat(wayland) Simplify CMakeLists file

Use external scripts to obtain the selected backend in lv_conf.h
Generate wayland protocol via a shell script instead of CMake

Author: etag4048

CMakeLists.txt

@@ -1,29 +1,25 @@
 cmake_minimum_required(VERSION 3.10)
 project(lvgl)
 
-# Please set the wanted option to 'ON'. By default, FBDEV is used
-# be sure to also enable the selected driver in lv_conf.h
+foreach(BACKEND_NAME "SDL" "LINUX_DRM" "LINUX_FBDEV" "X11" "WAYLAND")
 
-option(LV_USE_WAYLAND "Use the wayland client backend" OFF)
-option(LV_USE_SDL "Use the SDL backend" OFF)
-option(LV_USE_DRM "Use the libdrm backend" OFF)
-option(DEBUG_MODE "Disable optimizations and enable debugging" OFF)
+	execute_process(COMMAND "scripts/backend_conf.sh" ${BACKEND_NAME} OUTPUT_VARIABLE IS_BACKEND_ENABLED)
+	set("LV_USE_${BACKEND_NAME}" ${IS_BACKEND_ENABLED})
+
+endforeach()
+
+# Uncomment if the program needs debugging
+#set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O0 -ggdb")
 
 set(CMAKE_C_STANDARD 99) # LVGL officially supports C99 and above
 set(CMAKE_CXX_STANDARD 17) #C17
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
-
-if (DEBUG_MODE)
-
-    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O0 -ggdb")
-
-endif(DEBUG_MODE)
-
 set(EXECUTABLE_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/bin)
 
 add_subdirectory(lvgl)
 target_include_directories(lvgl PUBLIC ${PROJECT_SOURCE_DIR})
 
+
 if (LV_USE_DRM)
 
     include(${CMAKE_CURRENT_LIST_DIR}/lvgl/tests/FindLibDRM.cmake)
@@ -47,43 +43,12 @@ elseif (LV_USE_WAYLAND)
     pkg_check_modules(xkbcommon REQUIRED xkbcommon)
 
     # Wayland protocols
-    set(WAYLAND_PROTOCOLS_DIR "${CMAKE_CURRENT_SOURCE_DIR}/protocols")
-    find_program(WAYLAND_SCANNER_EXECUTABLE NAMES wayland-scanner)
     pkg_check_modules(WAYLAND_PROTOCOLS REQUIRED wayland-protocols>=1.25)
     pkg_get_variable(WAYLAND_PROTOCOLS_BASE wayland-protocols pkgdatadir)
 
-    macro(wayland_generate protocol_xml_file output_dir target)
-        get_filename_component(output_file_base ${protocol_xml_file} NAME_WE)
-        set(output_file_noext "${output_dir}/wayland-${output_file_base}-client-protocol")
-        add_custom_command(OUTPUT "${output_file_noext}.h"
-            COMMAND "${WAYLAND_SCANNER_EXECUTABLE}" client-header "${protocol_xml_file}" "${output_file_noext}.h"
-            DEPENDS "${protocol_xml_file}"
-            VERBATIM)
-
-        add_custom_command(OUTPUT "${output_file_noext}.c"
-            COMMAND "${WAYLAND_SCANNER_EXECUTABLE}" private-code "${protocol_xml_file}" "${output_file_noext}.c"
-            DEPENDS "${protocol_xml_file}"
-            VERBATIM)
-
-        if(NOT EXISTS ${protocol_xml_file})
-            message("Protocol XML file not found: " ${protocol_xml_file})
-        else()
-            set_property(TARGET ${target} APPEND PROPERTY SOURCES  "${output_file_noext}.h" "${output_file_noext}.c")
-        endif()
-
-    endmacro()
-
-    file(MAKE_DIRECTORY ${WAYLAND_PROTOCOLS_DIR})
-
-    add_custom_target(generate_protocols ALL)
-
-    wayland_generate("${WAYLAND_PROTOCOLS_BASE}/stable/xdg-shell/xdg-shell.xml" ${WAYLAND_PROTOCOLS_DIR} generate_protocols)
-
-    target_include_directories(lvgl PUBLIC ${PROJECT_SOURCE_DIR} ${WAYLAND_PROTOCOLS_DIR})
-
-    # TODO Add option to still be able to build wl_shell
-    add_executable(lvglsim main.c ${WAYLAND_PROTOCOLS_DIR}/wayland-xdg-shell-client-protocol.c mouse_cursor_icon.c)
-
+    execute_process(COMMAND "scripts/gen_wl_protocols.sh" OUTPUT_VARIABLE WAYLAND_PROTOCOLS_SRC)
+    target_include_directories(lvgl PUBLIC ${PROJECT_SOURCE_DIR} "wl_protocols")
+    add_executable(lvglsim main.c ${WAYLAND_PROTOCOLS_SRC} mouse_cursor_icon.c)
     target_compile_definitions(lvglsim PRIVATE LV_CONF_INCLUDE_SIMPLE)
     target_link_libraries(lvglsim lvgl lvgl::examples lvgl::demos lvgl::thorvg m wayland-client xkbcommon wayland-cursor)
 

main.c

@@ -54,8 +54,6 @@ static void lv_linux_disp_init(void)
     lv_display_t *disp;
     lv_group_t *g;
 
-    lv_wayland_init();
-
     disp = lv_wayland_window_create(window_width, window_height, "LVGL Simulator", NULL);
 
     if (fullscreen) {

scripts/backend_conf.sh

@@ -0,0 +1,2 @@
+#!/bin/sh
+grep "^#define LV_USE_$1" lv_conf.h | sed 's/#define //g' | awk '{ if ($2=="1") { printf "ON" } else { printf "OFF" }}'

scripts/gen_wl_protocols.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+# Generate wayland xdg shell protocol
+
+if ! test -d /usr/share/wayland-protocols
+then
+	exit 1
+fi
+
+if ! test -d wl_protocols
+then
+	mkdir wl_protocols
+	wayland-scanner client-header "/usr/share/wayland-protocols/stable/xdg-shell/xdg-shell.xml" "wl_protocols/wayland_xdg_shell.h"
+	wayland-scanner private-code "/usr/share/wayland-protocols/stable/xdg-shell/xdg-shell.xml" "wl_protocols/wayland_xdg_shell.c"
+fi
+
+printf "wl_protocols/wayland_xdg_shell.c"

scripts/testing.sh

@@ -0,0 +1 @@
+printf "ON"