From f6c7f386ddeef0113fde9f56c531e13bf7961218 Mon Sep 17 00:00:00 2001
From: Panos Karabelas <panosconroe@hotmail.com>
Date: Thu, 13 Feb 2025 16:37:27 +0000
Subject: [PATCH] [audiosource] implemented pitch control

---
 editor/Widgets/Properties.cpp            |  6 ++++++
 runtime/World/Components/AudioSource.cpp | 11 +++++++++++
 runtime/World/Components/AudioSource.h   | 16 ++++++++++------
 3 files changed, 27 insertions(+), 6 deletions(-)

diff --git a/editor/Widgets/Properties.cpp b/editor/Widgets/Properties.cpp
index f2882357c..404a00591 100644
--- a/editor/Widgets/Properties.cpp
+++ b/editor/Widgets/Properties.cpp
@@ -1049,6 +1049,7 @@ void Properties::ShowAudioSource(shared_ptr<AudioSource> audio_source) const
         bool loop              = audio_source->GetLoop();
         bool is_3d             = audio_source->GetIs3d();
         float volume           = audio_source->GetVolume();
+        float pitch            = audio_source->GetPitch();
         //========================================================
 
         // Audio clip
@@ -1072,6 +1073,10 @@ void Properties::ShowAudioSource(shared_ptr<AudioSource> audio_source) const
         ImGui::Text("Loop");
         ImGui::SameLine(column_pos_x); ImGui::Checkbox("##audioSourceLoop", &loop);
 
+        // Pitch
+        ImGui::Text("Pitch");
+        ImGui::SameLine(column_pos_x); ImGui::SliderFloat("##audioSourcePitch", &pitch, 0.0f, 3.0f);
+
         // loop
         ImGui::Text("3D");
         ImGui::SameLine(column_pos_x); ImGui::Checkbox("##audioSourceIs3D", &is_3d);
@@ -1086,6 +1091,7 @@ void Properties::ShowAudioSource(shared_ptr<AudioSource> audio_source) const
         if (loop != audio_source->GetLoop())                 audio_source->SetLoop(loop);
         if (is_3d != audio_source->GetIs3d())                audio_source->SetIs3d(is_3d);
         if (volume != audio_source->GetVolume())             audio_source->SetVolume(volume);
+        if (pitch != audio_source->GetPitch())               audio_source->SetPitch(pitch);
         //===============================================================================================
     }
     component_end();
diff --git a/runtime/World/Components/AudioSource.cpp b/runtime/World/Components/AudioSource.cpp
index c19711533..5f525649b 100644
--- a/runtime/World/Components/AudioSource.cpp
+++ b/runtime/World/Components/AudioSource.cpp
@@ -208,6 +208,7 @@ namespace spartan
         m_is_playing = true;
 
         SetVolume(m_volume);
+        SetPitch(m_pitch);
     }
 
     void AudioSource::Stop()
@@ -249,4 +250,14 @@ namespace spartan
             CHECK_SDL_ERROR(SDL_SetAudioDeviceGain(audio_device::id, m_volume * m_attenuation * mute));
         }
     }
+
+    void AudioSource::SetPitch(const float pitch)
+    {
+        m_pitch = clamp(pitch, 0.0f, 3.0f);
+
+        if (m_is_playing)
+        {
+            CHECK_SDL_ERROR(SDL_SetAudioStreamFrequencyRatio(m_stream, m_pitch));
+        }
+    }
 }
diff --git a/runtime/World/Components/AudioSource.h b/runtime/World/Components/AudioSource.h
index c20def71d..a3917eff4 100644
--- a/runtime/World/Components/AudioSource.h
+++ b/runtime/World/Components/AudioSource.h
@@ -68,14 +68,18 @@ namespace spartan
         float GetVolume() const { return m_volume; }
         void SetVolume(float volume);
 
+        float GetPitch() const { return m_pitch; }
+        void SetPitch(const float pitch);
+
     private:
         std::string m_name        = "N/A";
-        bool    m_is_3d           = false;
-        bool    m_mute            = false;
-        bool    m_loop            = true;
-        bool    m_play_on_start   = true;
-        float   m_volume          = 1.0f;
-        float   m_attenuation     = 1.0f;
+        bool m_is_3d              = false;
+        bool m_mute               = false;
+        bool m_loop               = true;
+        bool m_play_on_start      = true;
+        float m_volume            = 1.0f;
+        float m_pitch             = 1.0f;
+        float m_attenuation       = 1.0f;
         bool m_is_playing         = false;
         uint8_t* m_buffer         = nullptr;
         uint32_t m_length         = 0;