Make sure easter egg value is >0.

Gaussian distribution requires the sigma value to be >0. If the value is too small, we just use the default 1.0 value.

src/api/include/projectM-4/parameters.h

@@ -225,7 +225,7 @@ PROJECTM_EXPORT bool projectm_get_aspect_correction(projectm_handle instance);
  * <p>See function sampledPresetDuration() of the TimeKeeper class on how it is used.</p>
  *
  * @param instance The projectM instance handle.
- * @param value The new "easter egg" value.
+ * @param value The new "easter egg" value. Must be greater than zero, otherwise a default sigma value of 1.0 will be used.
  */
 PROJECTM_EXPORT void projectm_set_easter_egg(projectm_handle instance, float value);
 

src/libprojectM/ProjectM.hpp

@@ -196,7 +196,7 @@ class PROJECTM_EXPORT ProjectM
     float m_hardCutSensitivity{2.0}; //!< Loudness sensitivity value for hard cuts.
     float m_beatSensitivity{1.0};    //!< General beat sensitivity modifier for presets.
     bool m_aspectCorrection{true};   //!< If true, corrects aspect ratio for non-rectangular windows.
-    float m_easterEgg{0.0};          //!< Random preset duration modifier. See TimeKeeper class.
+    float m_easterEgg{1.0};          //!< Random preset duration modifier. See TimeKeeper class.
     float m_previousFrameVolume{};   //!< Volume in previous frame, used for hard cuts.
 
     std::vector<std::string> m_textureSearchPaths; ///!< List of paths to search for texture files

src/libprojectM/TimeKeeper.cpp

@@ -1,6 +1,7 @@
 #include "TimeKeeper.hpp"
 
 #include <algorithm>
+#include <random>
 
 namespace libprojectM {
 
@@ -105,7 +106,12 @@ double TimeKeeper::PresetTimeA()
 
 double TimeKeeper::sampledPresetDuration()
 {
-    std::normal_distribution<double> gaussianDistribution{m_presetDuration, m_easterEgg};
+    if (m_easterEgg < 0.001)
+    {
+        m_easterEgg = 1.0;
+    }
+
+    std::normal_distribution<double> gaussianDistribution(m_presetDuration, m_easterEgg);
     return std::max<double>(1.0, gaussianDistribution(m_randomGenerator));
 }