From b202ce51f7b68c460fcd1b6d9c3ffa8aaf2baaf6 Mon Sep 17 00:00:00 2001
From: Marek Vasut <marex@denx.de>
Date: Tue, 12 Mar 2024 19:05:38 +0100
Subject: [PATCH 6/6] Add SDL2 example support

Extend the main.c to support both legacy fbdev, DRM/KMS, SDL2 initialization.
The SDL2 window resolution can be configured using environment variables
LV_VIDEO_WIDTH and LV_VIDEO_HEIGHT and defaults to 800 x 480 .

To use legacy fbdev support, adjust lv_conf.h as follows:
LV_USE_LINUX_FBDEV=1
LV_USE_LINUX_DRM=0
LV_USE_SDL=0

To use DRM/KMS support, adjust lv_conf.h as follows:
LV_USE_LINUX_FBDEV=0
LV_USE_LINUX_DRM=1
LV_USE_SDL=0

To use SDL2 support, adjust lv_conf.h as follows:
LV_USE_LINUX_FBDEV=0
LV_USE_LINUX_DRM=0
LV_USE_SDL=1

Upstream-Status: Submitted [https://github.com/lvgl/lv_port_linux_frame_buffer/pull/47]
Signed-off-by: Marek Vasut <marex@denx.de>
---
 CMakeLists.txt | 6 +++++-
 main.c         | 8 ++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index c1cfb7f..658193f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,6 +15,10 @@ add_executable(main main.c mouse_cursor_icon.c)
 include(${CMAKE_CURRENT_LIST_DIR}/lvgl/tests/FindLibDRM.cmake)
 include_directories(${Libdrm_INCLUDE_DIRS})
 
-target_link_libraries(main lvgl lvgl::examples lvgl::demos lvgl::thorvg ${SDL2_LIBRARIES} ${Libdrm_LIBRARIES} m pthread)
+find_package(SDL2)
+find_package(SDL2_image)
+include_directories(${SDL2_INCLUDE_DIRS} ${SDL2_IMAGE_INCLUDE_DIRS})
+
+target_link_libraries(main lvgl lvgl::examples lvgl::demos lvgl::thorvg ${SDL2_LIBRARIES} ${SDL2_IMAGE_LIBRARIES} ${Libdrm_LIBRARIES} m pthread)
 add_custom_target (run COMMAND ${EXECUTABLE_OUTPUT_PATH}/main DEPENDS main)
 
diff --git a/main.c b/main.c
index ab4e936..4b66ebc 100644
--- a/main.c
+++ b/main.c
@@ -25,6 +25,14 @@ static void lv_linux_disp_init(void)
 
     lv_linux_drm_set_file(disp, videocard, -1);
 }
+#elif LV_USE_SDL
+static void lv_linux_disp_init(void)
+{
+    const int width = atoi(getenv("LV_VIDEO_WIDTH") ? : "800");
+    const int height = atoi(getenv("LV_VIDEO_HEIGHT") ? : "480");
+
+    lv_sdl_window_create(width, height);
+}
 #else
 #error Unsupported configuration
 #endif
-- 
2.43.0