PBRT
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00001 00002 // 00003 // Copyright (c) 2002, Industrial Light & Magic, a division of Lucas 00004 // Digital Ltd. LLC 00005 // 00006 // All rights reserved. 00007 // 00008 // Redistribution and use in source and binary forms, with or without 00009 // modification, are permitted provided that the following conditions are 00010 // met: 00011 // * Redistributions of source code must retain the above copyright 00012 // notice, this list of conditions and the following disclaimer. 00013 // * Redistributions in binary form must reproduce the above 00014 // copyright notice, this list of conditions and the following disclaimer 00015 // in the documentation and/or other materials provided with the 00016 // distribution. 00017 // * Neither the name of Industrial Light & Magic nor the names of 00018 // its contributors may be used to endorse or promote products derived 00019 // from this software without specific prior written permission. 00020 // 00021 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 00022 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 00023 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 00024 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 00025 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00026 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 00027 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 00028 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 00029 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00030 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 00031 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00032 // 00034 00035 00036 #ifndef INCLUDED_IMF_CONVERT_H 00037 #define INCLUDED_IMF_CONVERT_H 00038 00039 //----------------------------------------------------------------------------- 00040 // 00041 // Routines for converting between pixel data types, 00042 // with well-defined behavior for exceptional cases, 00043 // without depending on how hardware and operating 00044 // system handle integer overflows and floating-point 00045 // exceptions. 00046 // 00047 //----------------------------------------------------------------------------- 00048 00049 #include "half.h" 00050 00051 00052 namespace Imf { 00053 00054 //--------------------------------------------------------- 00055 // Conversion from half or float to unsigned int: 00056 // 00057 // input result 00058 // --------------------------------------------------- 00059 // 00060 // finite, >= 0 input, cast to unsigned int 00061 // (rounds towards zero) 00062 // 00063 // finite, < 0 0 00064 // 00065 // NaN 0 00066 // 00067 // +infinity UINT_MAX 00068 // 00069 // -infinity 0 00070 // 00071 //--------------------------------------------------------- 00072 00073 unsigned int halfToUint (half h); 00074 unsigned int floatToUint (float f); 00075 00076 00077 //--------------------------------------------------------- 00078 // Conversion from unsigned int or float to half: 00079 // 00080 // input result 00081 // --------------------------------------------------- 00082 // 00083 // finite, closest possible half 00084 // magnitude <= HALF_MAX 00085 // 00086 // finite, > HALF_MAX +infinity 00087 // 00088 // finite, < -HALF_MAX -infinity 00089 // 00090 // NaN NaN 00091 // 00092 // +infinity +infinity 00093 // 00094 // -infinity -infinity 00095 // 00096 //--------------------------------------------------------- 00097 00098 half uintToHalf (unsigned int ui); 00099 half floatToHalf (float f); 00100 00101 00102 } // namespace Imf 00103 00104 #endif