Merge pull request #47370 from fire/etcpak

Add thirdparty library etcpak for faster imports.

1 files changed, 50 insertions, 0 deletions

diff --git a/thirdparty/etcpak/ProcessCommon.hpp b/thirdparty/etcpak/ProcessCommon.hpp
new file mode 100644
index 0000000000..657d68888f
--- /dev/null
+++ b/thirdparty/etcpak/ProcessCommon.hpp
@@ -0,0 +1,50 @@
+#ifndef __PROCESSCOMMON_HPP__
+#define __PROCESSCOMMON_HPP__
+
+#include <assert.h>
+#include <stddef.h>
+#include <stdint.h>
+
+template<class T>
+static size_t GetLeastError( const T* err, size_t num )
+{
+    size_t idx = 0;
+    for( size_t i=1; i<num; i++ )
+    {
+        if( err[i] < err[idx] )
+        {
+            idx = i;
+        }
+    }
+    return idx;
+}
+
+static uint64_t FixByteOrder( uint64_t d )
+{
+    return ( ( d & 0x00000000FFFFFFFF ) ) |
+           ( ( d & 0xFF00000000000000 ) >> 24 ) |
+           ( ( d & 0x000000FF00000000 ) << 24 ) |
+           ( ( d & 0x00FF000000000000 ) >> 8 ) |
+           ( ( d & 0x0000FF0000000000 ) << 8 );
+}
+
+template<class T, class S>
+static uint64_t EncodeSelectors( uint64_t d, const T terr[2][8], const S tsel[16][8], const uint32_t* id )
+{
+    size_t tidx[2];
+    tidx[0] = GetLeastError( terr[0], 8 );
+    tidx[1] = GetLeastError( terr[1], 8 );
+
+    d |= tidx[0] << 26;
+    d |= tidx[1] << 29;
+    for( int i=0; i<16; i++ )
+    {
+        uint64_t t = tsel[i][tidx[id[i]%2]];
+        d |= ( t & 0x1 ) << ( i + 32 );
+        d |= ( t & 0x2 ) << ( i + 47 );
+    }
+
+    return d;
+}
+
+#endif