kc3-lang/angle/libGLESv2/mathutil.h

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• Author : daniel@transgaming.com
  Date : 2010-03-08 20:26:45
  Hash : 4f39fd99
  Message : Initial import from TransGaming git-svn-id: https://angleproject.googlecode.com/svn/trunk@2 736b8ea6-26fd-11df-bfd4-992fa37f6226

• 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 <math.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 float clamp01(float x)
  {
      return x < 0 ? 0 : (x > 1 ? 1 : x);
  }
  
  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);
      }
  }
  }
  
  #endif   // LIBGLESV2_MATHUTIL_H_