79 lines
2.5 KiB
C
79 lines
2.5 KiB
C
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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 _UTILS_H
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#define _UTILS_H
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#include "arvo/Vec3.h"
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using namespace ArvoMath;
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#ifndef MIN
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#define MIN(x,y) ((x)<(y)?(x):(y))
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#endif
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#ifndef MAX
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#define MAX(x,y) ((x)>(y)?(x):(y))
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#endif
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#define PALETTE_LERP(a, b, i, denom) Utils::lerp(a, b, i, denom)
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#define SIGN_EXTEND(x,nb) ((((signed(x))&(1<<((nb)-1)))?((~0)<<(nb)):0)|(signed(x)))
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enum Field { 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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#define F16S_MASK 0x8000 // f16 sign mask
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#define F16EM_MASK 0x7fff // f16 exp & mantissa mask
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#define U16MAX 0xffff
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#define S16MIN (-0x8000)
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#define S16MAX 0x7fff
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#define INT16_MASK 0xffff
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#define 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 double norm(const Vec3 &a, const Vec3 &b);
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static double mpsnr_norm(const Vec3 &a, int exposure, const Vec3 &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 Utils::clamp(Vec3 &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(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 Vec3 lerp(const Vec3& a, const Vec3 &b, int i, int denom);
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};
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#endif
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