-#ifndef __DALI_RANDOM_H__
-#define __DALI_RANDOM_H__
+#ifndef DALI_RANDOM_H
+#define DALI_RANDOM_H
/*
- * Copyright (c) 2015 Samsung Electronics Co., Ltd.
+ * Copyright (c) 2020 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(nullptr));
+ 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()
{
do
{
axis.x = Range(-1.0f, 1.0f);
- axis.y = Range( 0.0f, 1.0f);
- axis.z = Range( 0.0f, 1.0f);
+ axis.y = Range(0.0f, 1.0f);
+ axis.z = Range(0.0f, 1.0f);
axis.w = 0.0f;
- } while (axis == Vector4::ZERO);
+ } while(axis == Vector4::ZERO);
axis.Normalize();
return axis;
}
*/
} // namespace Dali
-#endif // __DALI_RANDOM_H__
+#endif // DALI_RANDOM_H