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cs440-acg/ext/openexr/IlmBase/Half/eLut.cpp

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+///////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
+// Digital Ltd. LLC
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+// *       Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// *       Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// *       Neither the name of Industrial Light & Magic nor the names of
+// its contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission. 
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+///////////////////////////////////////////////////////////////////////////
+
+
+
+#include <iostream>
+#include <iomanip>
+
+using namespace std;
+
+//-----------------------------------------------------
+// Compute a lookup table for float-to-half conversion.
+//
+// When indexed with the combined sign and exponent of
+// a float, the table either returns the combined sign
+// and exponent of the corresponding half, or zero if
+// the corresponding half may not be normalized (zero,
+// denormalized, overflow).
+//-----------------------------------------------------
+
+void
+initELut (unsigned short eLut[])
+{
+    for (int i = 0; i < 0x100; i++)
+    {
+	int e = (i & 0x0ff) - (127 - 15);
+
+	if (e <= 0 || e >= 30)
+	{
+	    //
+	    // Special case
+	    //
+
+	    eLut[i]         = 0;
+	    eLut[i | 0x100] = 0;
+	}
+	else
+	{
+	    //
+	    // Common case - normalized half, no exponent overflow possible
+	    //
+
+	    eLut[i]         =  (e << 10);
+	    eLut[i | 0x100] = ((e << 10) | 0x8000);
+	}
+    }
+}
+
+
+//------------------------------------------------------------
+// Main - prints the sign-and-exponent conversion lookup table
+//------------------------------------------------------------
+
+int
+main ()
+{
+    const int tableSize = 1 << 9;
+    unsigned short eLut[tableSize];
+    initELut (eLut);
+
+    cout << "//\n"
+	    "// This is an automatically generated file.\n"
+	    "// Do not edit.\n"
+	    "//\n\n";
+
+    cout << "{\n    ";
+
+    for (int i = 0; i < tableSize; i++)
+    {
+	cout << setw (5) << eLut[i] << ", ";
+
+	if (i % 8 == 7)
+	{
+	    cout << "\n";
+
+	    if (i < tableSize - 1)
+		cout << "    ";
+	}
+    }
+
+    cout << "};\n";
+    return 0;
+}