kc3-lang/angle/util/Vector.cpp

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• Hash : ad60e8ee
  Author :
  Date : 2015-09-22T12:40:31
  

  Move more sample_util sources to util.
  
  These sample utils can also be useful for writing perf tests.
  
  BUG=angleproject:1164
  
  Change-Id: I44b5d63b57bfce7a541442fd02cd729a1bab17f0
  Reviewed-on: https://chromium-review.googlesource.com/301468
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Reviewed-by: Corentin Wallez <cwallez@chromium.org>
  Tryjob-Request: Jamie Madill <jmadill@chromium.org>
  Tested-by: Jamie Madill <jmadill@chromium.org>
  

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• util/Vector.cpp

• //
  // Copyright (c) 2014 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.
  //
  // Vector:
  //   Vector class for linear math.
  //
  
  #include "Vector.h"
  
  #include <math.h>
  
  Vector2::Vector2() : x(0.0), y(0.0)
  {
  }
  
  Vector2::Vector2(float x, float y) : x(x), y(y)
  {
  }
  
  float Vector2::length(const Vector2 &vec)
  {
      float lenSquared = lengthSquared(vec);
      return (lenSquared != 0.0f) ? sqrtf(lenSquared) : 0.0f;
  }
  
  float Vector2::lengthSquared(const Vector2 &vec)
  {
      return vec.x * vec.x + vec.y * vec.y;
  }
  
  Vector2 Vector2::normalize(const Vector2 &vec)
  {
      Vector2 ret(0.0f, 0.0f);
      float len = length(vec);
      if (len != 0.0f)
      {
          float invLen = 1.0f / len;
          ret.x        = vec.x * invLen;
          ret.y        = vec.y * invLen;
      }
      return ret;
  }
  
  Vector3::Vector3() : x(0.0), y(0.0), z(0.0)
  {
  }
  
  Vector3::Vector3(float x, float y, float z) : x(x), y(y), z(z)
  {
  }
  
  float Vector3::length(const Vector3 &vec)
  {
      float lenSquared = lengthSquared(vec);
      return (lenSquared != 0.0f) ? sqrtf(lenSquared) : 0.0f;
  }
  
  float Vector3::lengthSquared(const Vector3 &vec)
  {
      return vec.x * vec.x + vec.y * vec.y + vec.z * vec.z;
  }
  
  Vector3 Vector3::normalize(const Vector3 &vec)
  {
      Vector3 ret(0.0f, 0.0f, 0.0f);
      float len = length(vec);
      if (len != 0.0f)
      {
          float invLen = 1.0f / len;
          ret.x        = vec.x * invLen;
          ret.y        = vec.y * invLen;
          ret.z        = vec.z * invLen;
      }
      return ret;
  }
  
  float Vector3::dot(const Vector3 &a, const Vector3 &b)
  {
      return a.x * b.x + a.y * b.y + a.z * b.z;
  }
  
  Vector3 Vector3::cross(const Vector3 &a, const Vector3 &b)
  {
      return Vector3(a.y * b.z - a.z * b.y, a.z * b.x - a.x * b.z, a.x * b.y - a.y * b.x);
  }
  
  Vector3 operator*(const Vector3 &a, const Vector3 &b)
  {
      return Vector3(a.x * b.x, a.y * b.y, a.z * b.z);
  }
  
  Vector3 operator*(const Vector3 &a, const float &b)
  {
      return Vector3(a.x * b, a.y * b, a.z * b);
  }
  
  Vector3 operator/(const Vector3 &a, const Vector3 &b)
  {
      return Vector3(a.x / b.x, a.y / b.y, a.z / b.z);
  }
  
  Vector3 operator/(const Vector3 &a, const float &b)
  {
      return Vector3(a.x / b, a.y / b, a.z / b);
  }
  
  Vector3 operator+(const Vector3 &a, const Vector3 &b)
  {
      return Vector3(a.x + b.x, a.y + b.y, a.z + b.z);
  }
  
  Vector3 operator-(const Vector3 &a, const Vector3 &b)
  {
      return Vector3(a.x - b.x, a.y - b.y, a.z - b.z);
  }
  
  Vector4::Vector4() : x(0.0f), y(0.0f), z(0.0f), w(0.0f)
  {
  }
  
  Vector4::Vector4(float x, float y, float z, float w) : x(x), y(y), z(z), w(w)
  {
  }
  
  float Vector4::length(const Vector4 &vec)
  {
      float lenSquared = lengthSquared(vec);
      return (lenSquared != 0.0f) ? sqrtf(lenSquared) : 0.0f;
  }
  
  float Vector4::lengthSquared(const Vector4 &vec)
  {
      return vec.x * vec.x + vec.y * vec.y + vec.z * vec.z + vec.w * vec.w;
  }
  
  Vector4 Vector4::normalize(const Vector4 &vec)
  {
      Vector4 ret(0.0f, 0.0f, 0.0f, 1.0f);
      if (vec.w != 0.0f)
      {
          float invLen = 1.0f / vec.w;
          ret.x        = vec.x * invLen;
          ret.y        = vec.y * invLen;
          ret.z        = vec.z * invLen;
      }
      return ret;
  }
  
  float Vector4::dot(const Vector4 &a, const Vector4 &b)
  {
      return a.x * b.x + a.y * b.y + a.z * b.z + a.w * b.w;
  }
  

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