1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/angle/src/libGLESv2/mathutil.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,161 @@
1.4 +//
1.5 +// Copyright (c) 2002-2012 The ANGLE Project Authors. All rights reserved.
1.6 +// Use of this source code is governed by a BSD-style license that can be
1.7 +// found in the LICENSE file.
1.8 +//
1.9 +
1.10 +// mathutil.h: Math and bit manipulation functions.
1.11 +
1.12 +#ifndef LIBGLESV2_MATHUTIL_H_
1.13 +#define LIBGLESV2_MATHUTIL_H_
1.14 +
1.15 +#include <intrin.h>
1.16 +
1.17 +#include "common/system.h"
1.18 +#include "common/debug.h"
1.19 +
1.20 +namespace gl
1.21 +{
1.22 +struct Vector4
1.23 +{
1.24 + Vector4() {}
1.25 + Vector4(float x, float y, float z, float w) : x(x), y(y), z(z), w(w) {}
1.26 +
1.27 + float x;
1.28 + float y;
1.29 + float z;
1.30 + float w;
1.31 +};
1.32 +
1.33 +inline bool isPow2(int x)
1.34 +{
1.35 + return (x & (x - 1)) == 0 && (x != 0);
1.36 +}
1.37 +
1.38 +inline int log2(int x)
1.39 +{
1.40 + int r = 0;
1.41 + while ((x >> r) > 1) r++;
1.42 + return r;
1.43 +}
1.44 +
1.45 +inline unsigned int ceilPow2(unsigned int x)
1.46 +{
1.47 + if (x != 0) x--;
1.48 + x |= x >> 1;
1.49 + x |= x >> 2;
1.50 + x |= x >> 4;
1.51 + x |= x >> 8;
1.52 + x |= x >> 16;
1.53 + x++;
1.54 +
1.55 + return x;
1.56 +}
1.57 +
1.58 +template<typename T, typename MIN, typename MAX>
1.59 +inline T clamp(T x, MIN min, MAX max)
1.60 +{
1.61 + // Since NaNs fail all comparison tests, a NaN value will default to min
1.62 + return x > min ? (x > max ? max : x) : min;
1.63 +}
1.64 +
1.65 +inline float clamp01(float x)
1.66 +{
1.67 + return clamp(x, 0.0f, 1.0f);
1.68 +}
1.69 +
1.70 +template<const int n>
1.71 +inline unsigned int unorm(float x)
1.72 +{
1.73 + const unsigned int max = 0xFFFFFFFF >> (32 - n);
1.74 +
1.75 + if (x > 1)
1.76 + {
1.77 + return max;
1.78 + }
1.79 + else if (x < 0)
1.80 + {
1.81 + return 0;
1.82 + }
1.83 + else
1.84 + {
1.85 + return (unsigned int)(max * x + 0.5f);
1.86 + }
1.87 +}
1.88 +
1.89 +inline bool supportsSSE2()
1.90 +{
1.91 + static bool checked = false;
1.92 + static bool supports = false;
1.93 +
1.94 + if (checked)
1.95 + {
1.96 + return supports;
1.97 + }
1.98 +
1.99 + int info[4];
1.100 + __cpuid(info, 0);
1.101 +
1.102 + if (info[0] >= 1)
1.103 + {
1.104 + __cpuid(info, 1);
1.105 +
1.106 + supports = (info[3] >> 26) & 1;
1.107 + }
1.108 +
1.109 + checked = true;
1.110 +
1.111 + return supports;
1.112 +}
1.113 +
1.114 +inline unsigned short float32ToFloat16(float fp32)
1.115 +{
1.116 + unsigned int fp32i = (unsigned int&)fp32;
1.117 + unsigned int sign = (fp32i & 0x80000000) >> 16;
1.118 + unsigned int abs = fp32i & 0x7FFFFFFF;
1.119 +
1.120 + if(abs > 0x47FFEFFF) // Infinity
1.121 + {
1.122 + return sign | 0x7FFF;
1.123 + }
1.124 + else if(abs < 0x38800000) // Denormal
1.125 + {
1.126 + unsigned int mantissa = (abs & 0x007FFFFF) | 0x00800000;
1.127 + int e = 113 - (abs >> 23);
1.128 +
1.129 + if(e < 24)
1.130 + {
1.131 + abs = mantissa >> e;
1.132 + }
1.133 + else
1.134 + {
1.135 + abs = 0;
1.136 + }
1.137 +
1.138 + return sign | (abs + 0x00000FFF + ((abs >> 13) & 1)) >> 13;
1.139 + }
1.140 + else
1.141 + {
1.142 + return sign | (abs + 0xC8000000 + 0x00000FFF + ((abs >> 13) & 1)) >> 13;
1.143 + }
1.144 +}
1.145 +
1.146 +float float16ToFloat32(unsigned short h);
1.147 +
1.148 +}
1.149 +
1.150 +namespace rx
1.151 +{
1.152 +
1.153 +struct Range
1.154 +{
1.155 + Range() {}
1.156 + Range(int lo, int hi) : start(lo), end(hi) { ASSERT(lo <= hi); }
1.157 +
1.158 + int start;
1.159 + int end;
1.160 +};
1.161 +
1.162 +}
1.163 +
1.164 +#endif // LIBGLESV2_MATHUTIL_H_
