[audiosource] added 3d attenuation

PanosK92 · Feb 13, 2025 · 763558b · 763558b
1 parent e7bfb5a
commit 763558b
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Showing 3 changed files with 51 additions and 18 deletions.
diff --git a/editor/Widgets/Properties.cpp b/editor/Widgets/Properties.cpp
@@ -1047,6 +1047,7 @@ void Properties::ShowAudioSource(shared_ptr<AudioSource> audio_source) const
         bool mute              = audio_source->GetMute();
         bool play_on_start     = audio_source->GetPlayOnStart();
         bool loop              = audio_source->GetLoop();
+        bool is_3d             = audio_source->GetIs3d();
         float volume           = audio_source->GetVolume();
         float pitch            = audio_source->GetPitch();
         float pan              = audio_source->GetPan();
@@ -1073,6 +1074,10 @@ void Properties::ShowAudioSource(shared_ptr<AudioSource> audio_source) const
         ImGui::Text("Loop");
         ImGui::SameLine(column_pos_x); ImGui::Checkbox("##audioSourceLoop", &loop);
 
+        // loop
+        ImGui::Text("3D");
+        ImGui::SameLine(column_pos_x); ImGui::Checkbox("##audioSourceIs3D", &is_3d);
+
         // volume
         ImGui::Text("Volume");
         ImGui::SameLine(column_pos_x); ImGui::SliderFloat("##audioSourceVolume", &volume, 0.0f, 1.0f);
@@ -1089,6 +1094,7 @@ void Properties::ShowAudioSource(shared_ptr<AudioSource> audio_source) const
         if (mute != audio_source->GetMute())                 audio_source->SetMute(mute);
         if (play_on_start != audio_source->GetPlayOnStart()) audio_source->SetPlayOnStart(play_on_start);
         if (loop != audio_source->GetLoop())                 audio_source->SetLoop(loop);
+        if (loop != 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);
         if (pan != audio_source->GetPan())                   audio_source->SetPan(pan);

diff --git a/runtime/World/Components/AudioSource.cpp b/runtime/World/Components/AudioSource.cpp
@@ -19,12 +19,17 @@ in an action of contract, tort or otherwise, arising from, out of or in
 connection with the software or the use or other dealings in the software.
 */
 
-//= includes ===================
+//= includes ========================
 #include "pch.h"
 #include "AudioSource.h"
-#include "../../IO/FileStream.h"
+SP_WARNINGS_OFF
 #include <SDL3/SDL_audio.h>
-//==============================
+SP_WARNINGS_ON
+#include "../../IO/FileStream.h"
+#include "../../Rendering/Renderer.h"
+#include "Camera.h"
+#include "../Entity.h"
+//===================================
 
 using namespace std;
 using namespace spartan::math;
@@ -122,12 +127,32 @@ namespace spartan
 
     void AudioSource::OnTick()
     {
-        if (m_loop && m_is_playing)
-        {
-            if (SDL_GetAudioStreamAvailable(m_stream) == 0) // buffer empty, restart
+        if (m_is_playing)
+        { 
+            if (m_loop)
+            {
+                if (SDL_GetAudioStreamAvailable(m_stream) == 0) // buffer empty, restart
+                {
+                    Stop(); // destroy stream
+                    Play(); // create stream
+                }
+            }
+
+            if (m_is_3d)
             {
-                Stop(); // destroy stream
-                Play(); // create stream
+                // todo: implement panning to stick a dot product in there
+
+                // attenuation
+                if (Camera* camera = Renderer::GetCamera().get())
+                {
+                   Vector3 camera_position = camera->GetEntity()->GetPosition();
+                   Vector3 sound_position  = GetEntity()->GetPosition();
+                   float distance_squared  = Vector3::DistanceSquared(camera_position, sound_position);
+                   float volume            = 1.0f / (1.0f + distance_squared); // inverse square law
+                   volume                  = max(0.0f, min(volume, 1.0f));
+                   SP_LOG_INFO("%f", volume);
+                   SetVolume(volume);
+                }
             }
         }
     }

diff --git a/runtime/World/Components/AudioSource.h b/runtime/World/Components/AudioSource.h
@@ -62,6 +62,9 @@ namespace spartan
         bool GetLoop() const          { return m_loop; }
         void SetLoop(const bool loop) { m_loop = loop; }
 
+        bool GetIs3d() const           { return m_is_3d; }
+        void SetIs3d(const bool is_3d) { m_is_3d = is_3d; }
+
         float GetVolume() const { return m_volume; }
         void SetVolume(float volume);
 
@@ -72,16 +75,15 @@ namespace spartan
         void SetPan(float pan);
 
     private:
-        std::string m_name          = "N/A";
-        bool    m_mute              = false;
-        bool    m_loop              = true;
-        bool    m_audio_clip_loaded = false;
-        bool    m_play_on_start     = true;
-        float   m_volume            = 1.0f;
-        float   m_pitch             = 1.0f;
-        float   m_pan               = 0.0f;
-        bool m_is_playing           = false;
-
+        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_pitch           = 1.0f;
+        float   m_pan             = 0.0f;
+        bool m_is_playing         = false;
         uint8_t* m_buffer         = nullptr;
         uint32_t m_length         = 0;
         SDL_AudioStream* m_stream = nullptr;