From 2b32ba593dc06db3689ce07908265af96b9c03b3 Mon Sep 17 00:00:00 2001
From: Mohamad Al-Jaf <mohamadaljaf@gmail.com>
Date: Thu, 8 Dec 2022 19:43:52 -0500
Subject: [PATCH] include: Add hrtfapoapi.idl file.

---
 include/Makefile.in    |   1 +
 include/hrtfapoapi.idl | 108 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 109 insertions(+)
 create mode 100644 include/hrtfapoapi.idl

diff --git a/include/Makefile.in b/include/Makefile.in
index c957fed884c..0dae4cab2bf 100644
--- a/include/Makefile.in
+++ b/include/Makefile.in
@@ -340,6 +340,7 @@ SOURCES = \
 	highlevelmonitorconfigurationapi.h \
 	hlguids.h \
 	hlink.idl \
+	hrtfapoapi.idl \
 	hstring.idl \
 	htiface.idl \
 	htiframe.idl \
diff --git a/include/hrtfapoapi.idl b/include/hrtfapoapi.idl
new file mode 100644
index 00000000000..15b479d0216
--- /dev/null
+++ b/include/hrtfapoapi.idl
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2023 Mohamad Al-Jaf
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+import "xapo.idl";
+
+cpp_quote("#include <float.h>")
+
+cpp_quote("#define HRTF_MAX_GAIN_LIMIT 12.0f")
+cpp_quote("#define HRTF_MIN_GAIN_LIMIT -96.0f")
+cpp_quote("#define HRTF_MIN_UNITY_GAIN_DISTANCE 0.05f")
+cpp_quote("#define HRTF_DEFAULT_UNITY_GAIN_DISTANCE 1.0f")
+cpp_quote("#define HRTF_DEFAULT_CUTOFF_DISTANCE FLT_MAX")
+
+typedef struct HrtfPosition
+{
+    float x;
+    float y;
+    float z;
+} HrtfPosition;
+
+typedef struct HrtfOrientation
+{
+    float element[9];
+} HrtfOrientation;
+
+typedef enum HrtfDirectivityType
+{
+    OmniDirectional,
+    Cardioid,
+    Cone,
+} HrtfDirectivityType;
+
+typedef enum HrtfEnvironment
+{
+    Small,
+    Medium,
+    Large,
+    Outdoors,
+} HrtfEnvironment;
+
+typedef struct HrtfDirectivity
+{
+    HrtfDirectivityType type;
+    float scaling;
+} HrtfDirectivity;
+
+typedef struct HrtfDirectivityCardioid
+{
+    HrtfDirectivity directivity;
+    float order;
+} HrtfDirectivityCardioid;
+
+typedef struct HrtfDirectivityCone
+{
+    HrtfDirectivity directivity;
+    float innerAngle;
+    float outerAngle;
+} HrtfDirectivityCone;
+
+typedef enum HrtfDistanceDecayType
+{
+    NaturalDecay,
+    CustomDecay,
+} HrtfDistanceDecayType;
+
+typedef struct HrtfDistanceDecay
+{
+    HrtfDistanceDecayType type;
+    float maxGain;
+    float minGain;
+    float unityGainDistance;
+    float cutoffDistance;
+} HrtfDistanceDecay;
+
+typedef struct HrtfApoInit
+{
+    HrtfDistanceDecay *distanceDecay;
+    HrtfDirectivity *directivity;
+} HrtfApoInit;
+
+HRESULT __stdcall CreateHrtfApo(const HrtfApoInit *init, IXAPO **xapo);
+
+[
+    object,
+    uuid(15b3cd66-e9de-4464-b6e6-2bc3cf63d455)
+]
+interface IXAPOHrtfParameters : IUnknown
+{
+    HRESULT SetSourcePosition(const HrtfPosition *position);
+    HRESULT SetSourceOrientation(const HrtfOrientation *orientation);
+    HRESULT SetSourceGain(float gain);
+    HRESULT SetEnvironment(HrtfEnvironment environment);
+}