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

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• Hash : 9616e583
  Author :
  Date : 2012-06-22T18:27:01
  

  Merge no-flip-rows r1142 to trunk.
  Review URL: https://codereview.appspot.com/6304052
  
  git-svn-id: https://angleproject.googlecode.com/svn/trunk@1162 736b8ea6-26fd-11df-bfd4-992fa37f6226
  

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• src/libGLESv2/mathutil.h

• //
  // Copyright (c) 2002-2010 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 <intrin.h>
  #include <math.h>
  #include <windows.h>
  
  namespace gl
  {
  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)
  {
      return x < min ? min : (x > max ? max : x);
  }
  
  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;
  }
  }
  
  #endif   // LIBGLESV2_MATHUTIL_H_
  

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