feat(osal): add SDL2 based threading and OS support (#7457)

Co-authored-by: ming <sungod@cheemer.org>

lv_conf_template.h

@@ -105,6 +105,7 @@
  * - LV_OS_RTTHREAD
  * - LV_OS_WINDOWS
  * - LV_OS_MQX
+ * - LV_OS_SDL2
  * - LV_OS_CUSTOM */
 #define LV_USE_OS   LV_OS_NONE
 

scripts/lv_conf_internal_gen.py

@@ -38,6 +38,7 @@ fout.write(
 #define LV_OS_RTTHREAD      4
 #define LV_OS_WINDOWS       5
 #define LV_OS_MQX           6
+#define LV_OS_SDL2          7
 #define LV_OS_CUSTOM        255
 
 #define LV_STDLIB_BUILTIN           0

src/lv_conf_internal.h

@@ -16,6 +16,7 @@
 #define LV_OS_RTTHREAD      4
 #define LV_OS_WINDOWS       5
 #define LV_OS_MQX           6
+#define LV_OS_SDL2          7
 #define LV_OS_CUSTOM        255
 
 #define LV_STDLIB_BUILTIN           0
@@ -263,6 +264,7 @@
  * - LV_OS_RTTHREAD
  * - LV_OS_WINDOWS
  * - LV_OS_MQX
+ * - LV_OS_SDL2
  * - LV_OS_CUSTOM */
 #ifndef LV_USE_OS
     #ifdef CONFIG_LV_USE_OS

src/osal/lv_os.h

@@ -35,6 +35,8 @@ extern "C" {
 #include "lv_windows.h"
 #elif LV_USE_OS == LV_OS_MQX
 #include "lv_mqx.h"
+#elif LV_USE_OS == LV_OS_SDL2
+#include "lv_sdl2.h"
 #elif LV_USE_OS == LV_OS_CUSTOM
 #include LV_OS_CUSTOM_INCLUDE
 #endif

src/osal/lv_sdl2.c

@@ -0,0 +1,183 @@
+/**
+ * @file lv_sdl2.c
+ *
+ */
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "lv_os.h"
+
+#if LV_USE_OS == LV_OS_SDL2
+
+#include <errno.h>
+#include "../misc/lv_log.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+static int generic_callback(void * user_data);
+
+/**********************
+ *  STATIC VARIABLES
+ **********************/
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+
+lv_result_t lv_thread_init(lv_thread_t * thread, lv_thread_prio_t prio, void (*callback)(void *), size_t stack_size,
+                           void * user_data)
+{
+    LV_UNUSED(prio);
+    thread->callback = callback;
+    thread->user_data = user_data;
+    thread->thread = SDL_CreateThreadWithStackSize(generic_callback, "LVGL", stack_size, thread);
+    if(thread->thread == NULL) {
+        LV_LOG_ERROR("Error: %s", SDL_GetError());
+        return LV_RESULT_INVALID;
+    }
+    return LV_RESULT_OK;
+}
+
+lv_result_t lv_thread_delete(lv_thread_t * thread)
+{
+    int ret;
+    SDL_WaitThread(thread->thread, &ret);
+    if(ret != 0) {
+        LV_LOG_ERROR("Error: %d", ret);
+        return LV_RESULT_INVALID;
+    }
+
+    return LV_RESULT_OK;
+}
+
+lv_result_t lv_mutex_init(lv_mutex_t * mutex)
+{
+    *mutex = SDL_CreateMutex();
+
+    if(*mutex == NULL) {
+        LV_LOG_ERROR("Error: %s", SDL_GetError());
+        return LV_RESULT_INVALID;
+    }
+    else {
+        return LV_RESULT_OK;
+    }
+}
+
+lv_result_t lv_mutex_lock(lv_mutex_t * mutex)
+{
+    int ret = SDL_LockMutex(*mutex);
+    if(ret) {
+        LV_LOG_ERROR("Error: %d", ret);
+        return LV_RESULT_INVALID;
+    }
+    else {
+        return LV_RESULT_OK;
+    }
+}
+
+lv_result_t lv_mutex_lock_isr(lv_mutex_t * mutex)
+{
+    int ret = SDL_LockMutex(*mutex);
+    if(ret) {
+        LV_LOG_ERROR("Error: %d", ret);
+        return LV_RESULT_INVALID;
+    }
+    else {
+        return LV_RESULT_OK;
+    }
+}
+
+lv_result_t lv_mutex_unlock(lv_mutex_t * mutex)
+{
+    int ret = SDL_UnlockMutex(*mutex);
+    if(ret) {
+        LV_LOG_ERROR("Error: %d", ret);
+        return LV_RESULT_INVALID;
+    }
+    else {
+        return LV_RESULT_OK;
+    }
+}
+
+lv_result_t lv_mutex_delete(lv_mutex_t * mutex)
+{
+    SDL_DestroyMutex(*mutex);
+    return LV_RESULT_OK;
+}
+
+lv_result_t lv_thread_sync_init(lv_thread_sync_t * sync)
+{
+    sync->mutex = SDL_CreateMutex();
+    if(sync->mutex == NULL) {
+        LV_LOG_ERROR("Error: %s", SDL_GetError());
+        return LV_RESULT_INVALID;
+    }
+    sync->cond = SDL_CreateCond();
+    if(sync->cond == NULL) {
+        LV_LOG_ERROR("Error: %s", SDL_GetError());
+        return LV_RESULT_INVALID;
+    }
+    sync->v = false;
+    return LV_RESULT_OK;
+}
+
+lv_result_t lv_thread_sync_wait(lv_thread_sync_t * sync)
+{
+    SDL_LockMutex(sync->mutex);
+    while(!sync->v) {
+        SDL_CondWait(sync->cond, sync->mutex);
+    }
+    sync->v = false;
+    SDL_UnlockMutex(sync->mutex);
+    return LV_RESULT_OK;
+}
+
+lv_result_t lv_thread_sync_signal(lv_thread_sync_t * sync)
+{
+    SDL_LockMutex(sync->mutex);
+    sync->v = true;
+    SDL_CondSignal(sync->cond);
+    SDL_UnlockMutex(sync->mutex);
+
+    return LV_RESULT_OK;
+}
+
+lv_result_t lv_thread_sync_delete(lv_thread_sync_t * sync)
+{
+    SDL_DestroyMutex(sync->mutex);
+    SDL_DestroyCond(sync->cond);
+    return LV_RESULT_OK;
+}
+
+lv_result_t lv_thread_sync_signal_isr(lv_thread_sync_t * sync)
+{
+    LV_UNUSED(sync);
+    return LV_RESULT_INVALID;
+}
+
+/**********************
+ *   STATIC FUNCTIONS
+ **********************/
+
+static int generic_callback(void * user_data)
+{
+    lv_thread_t * thread = user_data;
+    thread->callback(thread->user_data);
+    return 0;
+}
+
+#endif /*LV_USE_OS == LV_OS_SDL2*/

src/osal/lv_sdl2.h

@@ -0,0 +1,55 @@
+/**
+ * @file lv_sdl2.h
+ *
+ */
+
+#ifndef LV_SDL2_H
+#define LV_SDL2_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+#if LV_USE_OS == LV_OS_SDL2
+#include <SDL2/SDL.h>
+#include <stdbool.h>
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+typedef struct {
+    SDL_Thread * thread;
+    void (*callback)(void *);
+    void * user_data;
+} lv_thread_t;
+
+typedef SDL_mutex * lv_mutex_t;
+
+typedef struct {
+    SDL_mutex * mutex;
+    SDL_cond * cond;
+    bool v;
+} lv_thread_sync_t;
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+
+/**********************
+ *      MACROS
+ **********************/
+
+#endif /*LV_USE_OS == LV_OS_SDL2*/
+
+#ifdef __cplusplus
+} /*extern "C"*/
+#endif
+
+#endif /*LV_SDL2_H*/