2015-12-20 23:40:35 -05:00
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/*
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Copyright 2007 nVidia, Inc.
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Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
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You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and limitations under the License.
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*/
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// utility class holding common routines
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#ifndef _ZOH_UTILS_H
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#define _ZOH_UTILS_H
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2015-12-21 00:42:44 -05:00
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#include "nvmath/vector.h"
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2015-12-20 23:40:35 -05:00
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namespace ZOH {
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inline int SIGN_EXTEND(int x, int nb) { return ((((signed(x))&(1<<((nb)-1)))?((~0)<<(nb)):0)|(signed(x))); }
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enum Field {
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FIELD_M = 1, // mode
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FIELD_D = 2, // distribution/shape
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FIELD_RW = 10+0, FIELD_RX = 10+1, FIELD_RY = 10+2, FIELD_RZ = 10+3, // red channel endpoints or deltas
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FIELD_GW = 20+0, FIELD_GX = 20+1, FIELD_GY = 20+2, FIELD_GZ = 20+3, // green channel endpoints or deltas
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FIELD_BW = 30+0, FIELD_BX = 30+1, FIELD_BY = 30+2, FIELD_BZ = 30+3, // blue channel endpoints or deltas
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};
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// some constants
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static const int F16S_MASK = 0x8000; // f16 sign mask
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static const int F16EM_MASK = 0x7fff; // f16 exp & mantissa mask
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static const int U16MAX = 0xffff;
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static const int S16MIN = -0x8000;
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static const int S16MAX = 0x7fff;
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static const int INT16_MASK = 0xffff;
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static const int F16MAX = 0x7bff; // MAXFLT bit pattern for halfs
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enum Format { UNSIGNED_F16, SIGNED_F16 };
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class Utils
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{
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public:
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static Format FORMAT; // this is a global -- we're either handling unsigned or unsigned half values
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// error metrics
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static float norm(const nv::Vector3 &a, const nv::Vector3 &b);
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static float mpsnr_norm(const nv::Vector3 &a, int exposure, const nv::Vector3 &b);
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// conversion & clamp
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static int ushort_to_format(unsigned short input);
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static unsigned short format_to_ushort(int input);
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// clamp to format
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static void clamp(nv::Vector3 &v);
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// quantization and unquantization
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static int finish_unquantize(int q, int prec);
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static int unquantize(int q, int prec);
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static int quantize(float value, int prec);
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static void parse(const char *encoding, int &ptr, Field & field, int &endbit, int &len);
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// lerping
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static int lerp(int a, int b, int i, int denom);
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static nv::Vector3 lerp(const nv::Vector3 & a, const nv::Vector3 & b, int i, int denom);
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};
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}
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#endif // _ZOH_UTILS_H
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