change build system to CMake and use SDL3 for everything

libs/SDL3/test/testyuv_cvt.h

@@ -0,0 +1,28 @@
+/*
+  Copyright (C) 1997-2025 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.
+*/
+
+/* These functions are designed for testing correctness, not for speed */
+
+typedef enum
+{
+    YUV_CONVERSION_JPEG,        /**< Full range JPEG */
+    YUV_CONVERSION_BT601,       /**< BT.601 (the default) */
+    YUV_CONVERSION_BT709,       /**< BT.709 */
+    YUV_CONVERSION_BT2020,      /**< BT.2020 */
+    YUV_CONVERSION_AUTOMATIC    /**< BT.601 for SD content, BT.709 for HD content */
+} YUV_CONVERSION_MODE;
+
+extern void SetYUVConversionMode(YUV_CONVERSION_MODE mode);
+extern YUV_CONVERSION_MODE GetYUVConversionModeForResolution(int width, int height);
+extern SDL_Colorspace GetColorspaceForYUVConversionMode(YUV_CONVERSION_MODE mode);
+extern bool ConvertRGBtoYUV(Uint32 format, Uint8 *src, int pitch, Uint8 *out, int w, int h, YUV_CONVERSION_MODE mode, int monochrome, int luminance);
+extern int CalculateYUVPitch(Uint32 format, int width);