Use C99 bool internally in SDL

src/atomic/SDL_atomic.c

@@ -136,12 +136,12 @@ SDL_bool SDL_AtomicCompareAndSwap(SDL_AtomicInt *a, int oldval, int newval)
 #elif defined(SDL_PLATFORM_SOLARIS)
     return ((int)atomic_cas_uint((volatile uint_t *)&a->value, (uint_t)oldval, (uint_t)newval) == oldval);
 #elif defined(EMULATE_CAS)
-    SDL_bool retval = SDL_FALSE;
+    bool retval = false;
 
     enterLock(a);
     if (a->value == oldval) {
         a->value = newval;
-        retval = SDL_TRUE;
+        retval = true;
     }
     leaveLock(a);
 
@@ -166,12 +166,12 @@ SDL_bool SDL_AtomicCompareAndSwapPointer(void **a, void *oldval, void *newval)
 #elif defined(SDL_PLATFORM_SOLARIS)
     return (atomic_cas_ptr(a, oldval, newval) == oldval);
 #elif defined(EMULATE_CAS)
-    SDL_bool retval = SDL_FALSE;
+    bool retval = false;
 
     enterLock(a);
     if (*a == oldval) {
         *a = newval;
-        retval = SDL_TRUE;
+        retval = true;
     }
     leaveLock(a);
 

src/atomic/SDL_spinlock.c

@@ -128,13 +128,13 @@ SDL_bool SDL_TryLockSpinlock(SDL_SpinLock *lock)
     return ((int)atomic_cas_32((volatile uint32_t *)lock, 0, 1) == 0);
 #elif defined(PS2)
     uint32_t oldintr;
-    SDL_bool res = SDL_FALSE;
+    bool res = false;
     // disable interuption
     oldintr = DIntr();
 
     if (*lock == 0) {
         *lock = 1;
-        res = SDL_TRUE;
+        res = true;
     }
     // enable interuption
     if (oldintr) {
@@ -153,10 +153,10 @@ SDL_bool SDL_TryLockSpinlock(SDL_SpinLock *lock)
     if (*lock == 0) {
         *lock = 1;
         SDL_UnlockMutex(_spinlock_mutex);
-        return SDL_TRUE;
+        return true;
     } else {
         SDL_UnlockMutex(_spinlock_mutex);
-        return SDL_FALSE;
+        return false;
     }
 #endif
 }