added helper functions for setting and getting music and sfx volume

engine/SoundBase.cc

@@ -1,3 +1,5 @@
+#include <cmath>
+
 #include "SoundBase.h"
 #include "SoundBaseGlobal.h"
 
@@ -172,7 +174,25 @@ void SoundBase::HaltMusic () {
 	mCurrentMusic = NULL;
 }
 
+void SoundBase::SetMusicVolume(const float &music_volume) {
+	int mix_volume = static_cast<int> (fabsf(music_volume) * MIX_MAX_VOLUME);
 
+	Mix_VolumeMusic(mix_volume);
+}
+
+float SoundBase::GetMusicVolume() {
+	return static_cast<float>(Mix_VolumeMusic(-1)) / static_cast<float>(MIX_MAX_VOLUME);
+}
+
+void SoundBase::SetEffectsVolume(const float &effects_volume) {
+	int mix_volume = static_cast<int> (fabsf(effects_volume) * MIX_MAX_VOLUME);
+
+	Mix_Volume(-1, mix_volume);
+}
+
+float SoundBase::GetEffectsVolume() {
+	return static_cast<float>(Mix_Volume(-1, -1)) / static_cast<float>(MIX_MAX_VOLUME);
+}
 /*
  * Global Functions
  */

engine/SoundBase.h

@@ -39,6 +39,21 @@ class SoundBase : public Module {
 		void PlayMusic (const std::string &music_name);
 		void HaltMusic ();
 
+		/** \brief Sets the volume of the music channel to the given value
+		 *
+		 * \param music_value is a value from 0. (no music) to 1. (maximum volume)
+		 */
+		void SetMusicVolume (const float &music_volume);
+		/** \brief Returns the value of the music (0. - 1.) */
+		float GetMusicVolume ();
+		/** \brief Sets the volume of the music channel to the given value
+		 *
+		 * \param music_value is a value from 0. (no music) to 1. (maximum volume)
+		 */
+		void SetEffectsVolume (const float &effects_volume);
+		/** \brief Returns the value of the effects (0. - 1.) */
+		float GetEffectsVolume ();
+
 	protected:
 		/** \brief Initializes the system */
 		virtual int OnInit (int argc, char* argv[]);