Add a device method to retrieve the active latency

This is effectively the time until the next update will be heard by the user,
or the closest approximation thereof, in nanoseconds.

2 files changed, 10 insertions, 0 deletions

diff --git a/OpenAL32/Include/alMain.h b/OpenAL32/Include/alMain.h
index 8b1bcc0f..f4f3b88e 100644
--- a/OpenAL32/Include/alMain.h
+++ b/OpenAL32/Include/alMain.h
@@ -419,6 +419,8 @@ typedef struct {
     void (*StopCapture)(ALCdevice*);
     ALCenum (*CaptureSamples)(ALCdevice*, void*, ALCuint);
     ALCuint (*AvailableSamples)(ALCdevice*);
+
+    ALint64 (*GetLatency)(ALCdevice*);
 } BackendFuncs;
 
 struct BackendInfo {
@@ -604,6 +606,7 @@ struct ALCdevice_struct
 #define ALCdevice_StopCapture(a)         ((a)->Funcs->StopCapture((a)))
 #define ALCdevice_CaptureSamples(a,b,c)  ((a)->Funcs->CaptureSamples((a), (b), (c)))
 #define ALCdevice_AvailableSamples(a)    ((a)->Funcs->AvailableSamples((a)))
+#define ALCdevice_GetLatency(a)          ((a)->Funcs->GetLatency((a)))
 
 // Frequency was requested by the app or config file
 #define DEVICE_FREQUENCY_REQUEST                 (1<<1)
diff --git a/OpenAL32/Include/alu.h b/OpenAL32/Include/alu.h
index cd8f1554..f623589f 100644
--- a/OpenAL32/Include/alu.h
+++ b/OpenAL32/Include/alu.h
@@ -201,6 +201,13 @@ static __inline ALint64 maxi64(ALint64 a, ALint64 b)
 static __inline ALint64 clampi64(ALint64 val, ALint64 min, ALint64 max)
 { return mini64(max, maxi64(min, val)); }
 
+static __inline ALuint64 minu64(ALuint64 a, ALuint64 b)
+{ return ((a > b) ? b : a); }
+static __inline ALuint64 maxu64(ALuint64 a, ALuint64 b)
+{ return ((a > b) ? a : b); }
+static __inline ALuint64 clampu64(ALuint64 val, ALuint64 min, ALuint64 max)
+{ return minu64(max, maxu64(min, val)); }
+
 
 static __inline ALfloat lerp(ALfloat val1, ALfloat val2, ALfloat mu)
 {