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lvgl: lvgl-demo-fb: Switch to CMake and add DRM and SDL support

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Switch the build of this recipe to CMake from the horrible Makefile
which is still part of the source tree and which blatantly encodes
various CFLAGS and co.

Add support for use of DRM and SDL backends and make this configurable.
The FBDEV is deprecated for close to two decades, so provide modern
alternatives -- DRM and SDL.

The DRM uses modern DRM API, but there is no GPU acceleration.
The SDL provides GPU support abstracted via the libSDL2 API and
can use multiple backends, DRM and WL included.

Default to the DRM backend, because FBDEV is just bad for any modern system.

Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
This commit is contained in:
Marek Vasut 2023-05-18 20:59:20 +02:00 committed by Khem Raj
parent 1cc72c41af
commit ffb3c1108a
1 changed files with 48 additions and 8 deletions
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56
meta-oe/recipes-graphics/lvgl/lvgl-demo-fb_8.3.0.bb
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@ -8,14 +8,54 @@ LIC_FILES_CHKSUM = "file://LICENSE;md5=802d3d83ae80ef5f343050bf96cce3a4 \
SRC_URI = "gitsm://github.com/lvgl/lv_port_linux_frame_buffer.git;branch=master;protocol=https"
SRCREV = "adf2c4490e17a1b9ec1902cc412a24b3b8235c8e"
S = "${WORKDIR}/git"
REQUIRED_DISTRO_FEATURES = "fbdev"
inherit features_check
EXTRA_OEMAKE = "DESTDIR=${D}"
do_install() {
oe_runmake install
PACKAGECONFIG ??= "drm"
PACKAGECONFIG[drm] = ",,libdrm"
PACKAGECONFIG[fbdev] = ",,"
PACKAGECONFIG[sdl] = ",,virtual/libsdl2"
LVGL_CONFIG_USE_DRM = "${@bb.utils.contains('PACKAGECONFIG', 'drm', '1', '0', d)}"
LVGL_CONFIG_DRM_CARD ?= "/dev/dri/card0"
LVGL_CONFIG_USE_FBDEV = "${@bb.utils.contains('PACKAGECONFIG', 'fbdev', '1', '0', d)}"
LVGL_CONFIG_USE_SDL = "${@bb.utils.contains('PACKAGECONFIG', 'sdl', '1', '0', d)}"
inherit cmake
S = "${WORKDIR}/git"
EXTRA_OECMAKE += "-Dinstall:BOOL=ON -DLIB_INSTALL_DIR=${baselib}"
TARGET_CFLAGS += "-I${STAGING_INCDIR}/libdrm"
do_configure:prepend() {
sed -i -e "s|\(^# define USE_FBDEV \).*|# define USE_FBDEV ${LVGL_CONFIG_USE_FBDEV}|g" \
-e "s|\(^# define USE_DRM \).*|# define USE_DRM ${LVGL_CONFIG_USE_DRM}|g" \
-e "s|\(^# define DRM_CARD \).*|# define DRM_CARD \"${LVGL_CONFIG_DRM_CARD}\"|g" \
-e "s|\(^# define USE_SDL \).*|# define USE_SDL ${LVGL_CONFIG_USE_SDL}|g" \
-e "s|\(^# define USE_SDL_GPU \).*|# define USE_SDL_GPU 1|g" \
-e "s|\(^# define SDL_DOUBLE_BUFFERED \).*|# define SDL_DOUBLE_BUFFERED 1|g" \
"${S}/lv_drv_conf.h"
if [ "${LVGL_CONFIG_USE_DRM}" -eq 1 ] ; then
# Add libdrm build dependency
sed -i '/^target_link_libraries/ s@lvgl::drivers@& drm@' "${S}/CMakeLists.txt"
# Switch from fbdev to drm usage
sed -i 's@fbdev@drm@g' "${S}/main.c"
# Pull resolution from DRM instead of hardcoding it
sed -i '/disp_drv.hor_res/ d' "${S}/main.c"
sed -i '/disp_drv.ver_res/ s@disp_drv.ver_res.*@drm_get_sizes(\&disp_drv.hor_res, \&disp_drv.ver_res, NULL);@' "${S}/main.c"
fi
if [ "${LVGL_CONFIG_USE_SDL}" -eq 1 ] ; then
# Add libsdl build dependency
sed -i '/^target_link_libraries/ s@lvgl::drivers@& SDL2@' "${S}/CMakeLists.txt"
# Switch from fbdev to sdl usage
sed -i 's@fbdev_flush@sdl_display_flush@g' "${S}/main.c"
sed -i 's@lv_drivers/display/fbdev.h@lv_drivers/sdl/sdl.h@g' "${S}/main.c"
sed -i 's@fbdev@sdl@g' "${S}/main.c"
fi
}
do_install:append() {
install -d ${D}${bindir}
install -m 0755 ${B}/lvgl_fb ${D}${bindir}/
}