SWITCH: first commit, missing audio, input... (#1)

* SWITCH: first commit, missing audio, input...

src/timer/switch/SDL_systimer.c

@@ -0,0 +1,78 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#ifdef SDL_TIMER_SWITCH
+
+#include "SDL_thread.h"
+#include "SDL_timer.h"
+#include "../SDL_timer_c.h"
+#include <switch.h>
+
+static bool started = false;
+
+static Uint64 start = 0;
+
+void
+SDL_TicksInit(void)
+{
+    if (started) {
+        return;
+    }
+
+    start = SDL_GetPerformanceCounter();
+    started = true;
+}
+
+void
+SDL_TicksQuit(void)
+{
+    started = false;
+}
+
+Uint32 SDL_GetTicks(void)
+{
+    if (!started) {
+        SDL_TicksInit();
+    }
+
+    return (Uint32) ((SDL_GetPerformanceCounter() - start) * 1000 / SDL_GetPerformanceFrequency());
+}
+
+Uint64
+SDL_GetPerformanceCounter(void)
+{
+    return svcGetSystemTick();
+}
+
+Uint64
+SDL_GetPerformanceFrequency(void)
+{
+    return 19200000;
+}
+
+void
+SDL_Delay(Uint32 ms)
+{
+    svcSleepThread((Uint64) ms * 1000000);
+}
+
+#endif /* SDL_TIMER_SWITCH */