#define __DALI_RANDOM_H__
/*
- * Copyright (c) 2015 Samsung Electronics Co., Ltd.
+ * Copyright (c) 2018 Samsung Electronics Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
namespace Dali
{
/**
- * @addtogroup dali-core-math
+ * @addtogroup dali_core_math
* @{
*/
/**
* @brief Provides methods to generate and use random values.
+ * @SINCE_1_0.0
*/
namespace Random
{
* @brief Returns a random number between f0 and f1.
*
* Note, uses a limited number of values.
- * @param[in] f0 the lower bound
- * @param[in] f1 the upper bound
- * @return a random value between the lower and upper bound
+ * @SINCE_1_0.0
+ * @param[in] f0 The lower bound
+ * @param[in] f1 The upper bound
+ * @return A random value between the lower and upper bound
*/
inline float Range(float f0, float f1)
{
float min = std::min(f0, f1);
float max = std::max(f0, f1);
- return min + (rand() & 0xfff) * (max-min) * (1.0f/4095.0f);
+
+ // Ensure we initialize only once. As it's inlined, this static variable will exist in the code-block using it, thus,
+ // will be created and then initialized again when another code-block uses this.
+ static bool initialized( false );
+ if( !initialized )
+ {
+ uint32_t seed = static_cast<uint32_t>( time( NULL ) );
+ srand( seed );
+ initialized = true;
+ }
+
+ int32_t randValue = rand();
+ return static_cast<float>(randValue & 0xfff) * (1.0f/4095.0f) * (max-min) + min;
}
/**
* @brief Function to return a normalized axis in a random direction.
*
- * @return the axis
+ * @SINCE_1_0.0
+ * @return The axis
*/
inline Vector4 Axis()
{