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 // // Copyright (c) 2002-2012 The ANGLE Project Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. // // mathutil.h: Math and bit manipulation functions. #ifndef LIBGLESV2_MATHUTIL_H_ #define LIBGLESV2_MATHUTIL_H_ #include #include #include "common/system.h" namespace gl { struct Vector4 { Vector4() {} Vector4(float x, float y, float z, float w) : x(x), y(y), z(z), w(w) {} float x; float y; float z; float w; }; inline bool isPow2(int x) { return (x & (x - 1)) == 0 && (x != 0); } inline int log2(int x) { int r = 0; while ((x >> r) > 1) r++; return r; } inline unsigned int ceilPow2(unsigned int x) { if (x != 0) x--; x |= x >> 1; x |= x >> 2; x |= x >> 4; x |= x >> 8; x |= x >> 16; x++; return x; } template inline T clamp(T x, MIN min, MAX max) { return x < min ? min : (x > max ? max : x); } inline float clamp01(float x) { return clamp(x, 0.0f, 1.0f); } template inline unsigned int unorm(float x) { const unsigned int max = 0xFFFFFFFF >> (32 - n); if (x > 1) { return max; } else if (x < 0) { return 0; } else { return (unsigned int)(max * x + 0.5f); } } inline bool supportsSSE2() { static bool checked = false; static bool supports = false; if (checked) { return supports; } int info[4]; __cpuid(info, 0); if (info[0] >= 1) { __cpuid(info, 1); supports = (info[3] >> 26) & 1; } checked = true; return supports; } inline unsigned short float32ToFloat16(float fp32) { unsigned int fp32i = (unsigned int&)fp32; unsigned int sign = (fp32i & 0x80000000) >> 16; unsigned int abs = fp32i & 0x7FFFFFFF; if(abs > 0x47FFEFFF) // Infinity { return sign | 0x7FFF; } else if(abs < 0x38800000) // Denormal { unsigned int mantissa = (abs & 0x007FFFFF) | 0x00800000; int e = 113 - (abs >> 23); if(e < 24) { abs = mantissa >> e; } else { abs = 0; } return sign | (abs + 0x00000FFF + ((abs >> 13) & 1)) >> 13; } else { return sign | (abs + 0xC8000000 + 0x00000FFF + ((abs >> 13) & 1)) >> 13; } } float float16ToFloat32(unsigned short h); } #endif // LIBGLESV2_MATHUTIL_H_