kc3-lang/angle/src/libGLESv2/mathutil.h

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• Author : shannon.woods@transgaming.com
  Date : 2013-02-28 23:16:20
  Hash : bdf2d80f
  Message : Add precompiled header support for the libGLESv2 project. TRAC #22518 Signed-off-by: Geoff Lang Signed-off-by: Shannon Woods Author: Jamie Madill git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@1938 736b8ea6-26fd-11df-bfd4-992fa37f6226

• src/libGLESv2/mathutil.h

• //
  // 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 "common/system.h"
  #include "common/debug.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<typename T, typename MIN, typename MAX>
  inline T clamp(T x, MIN min, MAX max)
  {
      // Since NaNs fail all comparison tests, a NaN value will default to min
      return x > min ? (x > max ? max : x) : min;
  }
  
  inline float clamp01(float x)
  {
      return clamp(x, 0.0f, 1.0f);
  }
  
  template<const int n>
  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);
  
  }
  
  namespace rx
  {
  
  struct Range
  {
      Range() {}
      Range(int lo, int hi) : start(lo), end(hi) { ASSERT(lo <= hi); }
  
      int start;
      int end;
  };
  
  }
  
  #endif   // LIBGLESV2_MATHUTIL_H_