audio: Add gain support to audio streams and logical audio devices.

Fixes #10028.

src/dynapi/SDL_dynapi.sym

@@ -167,6 +167,7 @@ SDL3_0.0.0 {
     SDL_GetAssertionHandler;
     SDL_GetAssertionReport;
     SDL_GetAudioDeviceFormat;
+    SDL_GetAudioDeviceGain;
     SDL_GetAudioDeviceName;
     SDL_GetAudioDriver;
     SDL_GetAudioPlaybackDevices;
@@ -176,6 +177,7 @@ SDL3_0.0.0 {
     SDL_GetAudioStreamDevice;
     SDL_GetAudioStreamFormat;
     SDL_GetAudioStreamFrequencyRatio;
+    SDL_GetAudioStreamGain;
     SDL_GetAudioStreamProperties;
     SDL_GetAudioStreamQueued;
     SDL_GetBasePath;
@@ -682,9 +684,11 @@ SDL3_0.0.0 {
     SDL_SendJoystickEffect;
     SDL_SendJoystickVirtualSensorData;
     SDL_SetAssertionHandler;
+    SDL_SetAudioDeviceGain;
     SDL_SetAudioPostmixCallback;
     SDL_SetAudioStreamFormat;
     SDL_SetAudioStreamFrequencyRatio;
+    SDL_SetAudioStreamGain;
     SDL_SetAudioStreamGetCallback;
     SDL_SetAudioStreamPutCallback;
     SDL_SetBooleanProperty;

src/dynapi/SDL_dynapi_overrides.h

@@ -191,6 +191,7 @@
 #define SDL_GetAndroidSDKVersion SDL_GetAndroidSDKVersion_REAL
 #define SDL_GetAssertionHandler SDL_GetAssertionHandler_REAL
 #define SDL_GetAssertionReport SDL_GetAssertionReport_REAL
+#define SDL_GetAudioDeviceGain SDL_GetAudioDeviceGain_REAL
 #define SDL_GetAudioDeviceFormat SDL_GetAudioDeviceFormat_REAL
 #define SDL_GetAudioDeviceName SDL_GetAudioDeviceName_REAL
 #define SDL_GetAudioDriver SDL_GetAudioDriver_REAL
@@ -201,6 +202,7 @@
 #define SDL_GetAudioStreamDevice SDL_GetAudioStreamDevice_REAL
 #define SDL_GetAudioStreamFormat SDL_GetAudioStreamFormat_REAL
 #define SDL_GetAudioStreamFrequencyRatio SDL_GetAudioStreamFrequencyRatio_REAL
+#define SDL_GetAudioStreamGain SDL_GetAudioStreamGain_REAL
 #define SDL_GetAudioStreamProperties SDL_GetAudioStreamProperties_REAL
 #define SDL_GetAudioStreamQueued SDL_GetAudioStreamQueued_REAL
 #define SDL_GetBasePath SDL_GetBasePath_REAL
@@ -707,9 +709,11 @@
 #define SDL_SendJoystickEffect SDL_SendJoystickEffect_REAL
 #define SDL_SendJoystickVirtualSensorData SDL_SendJoystickVirtualSensorData_REAL
 #define SDL_SetAssertionHandler SDL_SetAssertionHandler_REAL
+#define SDL_SetAudioDeviceGain SDL_SetAudioDeviceGain_REAL
 #define SDL_SetAudioPostmixCallback SDL_SetAudioPostmixCallback_REAL
 #define SDL_SetAudioStreamFormat SDL_SetAudioStreamFormat_REAL
 #define SDL_SetAudioStreamFrequencyRatio SDL_SetAudioStreamFrequencyRatio_REAL
+#define SDL_SetAudioStreamGain SDL_SetAudioStreamGain_REAL
 #define SDL_SetAudioStreamGetCallback SDL_SetAudioStreamGetCallback_REAL
 #define SDL_SetAudioStreamPutCallback SDL_SetAudioStreamPutCallback_REAL
 #define SDL_SetBooleanProperty SDL_SetBooleanProperty_REAL

src/dynapi/SDL_dynapi_procs.h

@@ -212,6 +212,7 @@ SDL_DYNAPI_PROC(int,SDL_GetAndroidSDKVersion,(void),(),return)
 SDL_DYNAPI_PROC(SDL_AssertionHandler,SDL_GetAssertionHandler,(void **a),(a),return)
 SDL_DYNAPI_PROC(const SDL_AssertData*,SDL_GetAssertionReport,(void),(),return)
 SDL_DYNAPI_PROC(int,SDL_GetAudioDeviceFormat,(SDL_AudioDeviceID a, SDL_AudioSpec *b, int *c),(a,b,c),return)
+SDL_DYNAPI_PROC(float,SDL_GetAudioDeviceGain,(SDL_AudioDeviceID a),(a),return)
 SDL_DYNAPI_PROC(const char*,SDL_GetAudioDeviceName,(SDL_AudioDeviceID a),(a),return)
 SDL_DYNAPI_PROC(const char*,SDL_GetAudioDriver,(int a),(a),return)
 SDL_DYNAPI_PROC(SDL_AudioDeviceID*,SDL_GetAudioPlaybackDevices,(int *a),(a),return)
@@ -221,6 +222,7 @@ SDL_DYNAPI_PROC(int,SDL_GetAudioStreamData,(SDL_AudioStream *a, void *b, int c),
 SDL_DYNAPI_PROC(SDL_AudioDeviceID,SDL_GetAudioStreamDevice,(SDL_AudioStream *a),(a),return)
 SDL_DYNAPI_PROC(int,SDL_GetAudioStreamFormat,(SDL_AudioStream *a, SDL_AudioSpec *b, SDL_AudioSpec *c),(a,b,c),return)
 SDL_DYNAPI_PROC(float,SDL_GetAudioStreamFrequencyRatio,(SDL_AudioStream *a),(a),return)
+SDL_DYNAPI_PROC(float,SDL_GetAudioStreamGain,(SDL_AudioStream *a),(a),return)
 SDL_DYNAPI_PROC(SDL_PropertiesID,SDL_GetAudioStreamProperties,(SDL_AudioStream *a),(a),return)
 SDL_DYNAPI_PROC(int,SDL_GetAudioStreamQueued,(SDL_AudioStream *a),(a),return)
 SDL_DYNAPI_PROC(char*,SDL_GetBasePath,(void),(),return)
@@ -718,9 +720,11 @@ SDL_DYNAPI_PROC(int,SDL_SendGamepadEffect,(SDL_Gamepad *a, const void *b, int c)
 SDL_DYNAPI_PROC(int,SDL_SendJoystickEffect,(SDL_Joystick *a, const void *b, int c),(a,b,c),return)
 SDL_DYNAPI_PROC(int,SDL_SendJoystickVirtualSensorData,(SDL_Joystick *a, SDL_SensorType b, Uint64 c, const float *d, int e),(a,b,c,d,e),return)
 SDL_DYNAPI_PROC(void,SDL_SetAssertionHandler,(SDL_AssertionHandler a, void *b),(a,b),)
+SDL_DYNAPI_PROC(int,SDL_SetAudioDeviceGain,(SDL_AudioDeviceID a, float b),(a,b),return)
 SDL_DYNAPI_PROC(int,SDL_SetAudioPostmixCallback,(SDL_AudioDeviceID a, SDL_AudioPostmixCallback b, void *c),(a,b,c),return)
 SDL_DYNAPI_PROC(int,SDL_SetAudioStreamFormat,(SDL_AudioStream *a, const SDL_AudioSpec *b, const SDL_AudioSpec *c),(a,b,c),return)
 SDL_DYNAPI_PROC(int,SDL_SetAudioStreamFrequencyRatio,(SDL_AudioStream *a, float b),(a,b),return)
+SDL_DYNAPI_PROC(int,SDL_SetAudioStreamGain,(SDL_AudioStream *a, float b),(a,b),return)
 SDL_DYNAPI_PROC(int,SDL_SetAudioStreamGetCallback,(SDL_AudioStream *a, SDL_AudioStreamCallback b, void *c),(a,b,c),return)
 SDL_DYNAPI_PROC(int,SDL_SetAudioStreamPutCallback,(SDL_AudioStream *a, SDL_AudioStreamCallback b, void *c),(a,b,c),return)
 SDL_DYNAPI_PROC(int,SDL_SetBooleanProperty,(SDL_PropertiesID a, const char *b, SDL_bool c),(a,b,c),return)