ref: c1d318eb322ce0ed71975da32ad47e77eb4b63d0
parent: cac8df132a2fdc264a86b066b8e58cb48e99956e
author: Jacob Moody <moody@posixcafe.org>
date: Sun Jan 29 05:42:33 EST 2023
vendor sdl endian swap
--- /dev/null
+++ b/include/npe/SDL2/SDL_endian.h
@@ -1,0 +1,60 @@
+#ifndef _npe_SDL_endian_h_
+#define _npe_SDL_endian_h_
+
+#define SDL_LIL_ENDIAN 1234
+#define SDL_BIG_ENDIAN 4321
+
+#if defined(__amd64__) || defined(__386__) || defined(__arm__) || defined(__arm64__) || defined(__spim__)
+#define SDL_BYTEORDER SDL_LIL_ENDIAN
+#elif defined(__mips__) || defined(__power__)
+#define SDL_BYTEORDER SDL_BIG_ENDIAN
+#endif
+
+static u16int
+SDL_Swap16(u16int x)
+{+ return (x<<8) | (x>>8);
+}
+
+static u32int
+SDL_Swap32(u32int x)
+{+ return ((x << 24) | ((x << 8) & 0x00FF0000) | ((x >> 8) & 0x0000FF00) | (x >> 24));
+}
+
+static u64int
+SDL_Swap64(u64int x)
+{+ u32int hi, lo;
+
+ /* Separate into high and low 32-bit values and swap them */
+ lo = x & 0xFFFFFFFF;
+ x >>= 32;
+ hi = x & 0xFFFFFFFF;
+ x = SDL_Swap32(lo);
+ x <<= 32;
+ x |= SDL_Swap32(hi);
+ return (x);
+}
+
+#if SDL_BYTEORDER == SDL_LIL_ENDIAN
+#define SDL_SwapLE16(X) (X)
+#define SDL_SwapLE32(X) (X)
+#define SDL_SwapLE64(X) (X)
+#define SDL_SwapFloatLE(X) (X)
+#define SDL_SwapBE16(X) SDL_Swap16(X)
+#define SDL_SwapBE32(X) SDL_Swap32(X)
+#define SDL_SwapBE64(X) SDL_Swap64(X)
+#define SDL_SwapFloatBE(X) SDL_SwapFloat(X)
+#else
+#define SDL_SwapLE16(X) SDL_Swap16(X)
+#define SDL_SwapLE32(X) SDL_Swap32(X)
+#define SDL_SwapLE64(X) SDL_Swap64(X)
+#define SDL_SwapFloatLE(X) SDL_SwapFloat(X)
+#define SDL_SwapBE16(X) (X)
+#define SDL_SwapBE32(X) (X)
+#define SDL_SwapBE64(X) (X)
+#define SDL_SwapFloatBE(X) (X)
+#endif
+
+#endif