From 99174e4e5fb4b7079da80b35a6dfd68f3fd56a1c Mon Sep 17 00:00:00 2001
From: lbavoil <lbavoil@nvidia.com>
Date: Fri, 25 Mar 2016 13:01:54 +0100
Subject: GFSDK_HBAO+_distro_r3.0_cl20573789

---
 src/ProjectionMatrixInfo.h | 72 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 src/ProjectionMatrixInfo.h

(limited to 'src/ProjectionMatrixInfo.h')

diff --git a/src/ProjectionMatrixInfo.h b/src/ProjectionMatrixInfo.h
new file mode 100644
index 0000000..e4216a2
--- /dev/null
+++ b/src/ProjectionMatrixInfo.h
@@ -0,0 +1,72 @@
+/* 
+* Copyright (c) 2008-2016, NVIDIA CORPORATION. All rights reserved. 
+* 
+* NVIDIA CORPORATION and its licensors retain all intellectual property 
+* and proprietary rights in and to this software, related documentation 
+* and any modifications thereto. Any use, reproduction, disclosure or 
+* distribution of this software and related documentation without an express 
+* license agreement from NVIDIA CORPORATION is strictly prohibited. 
+*/
+
+#pragma once
+#include "Common.h"
+
+namespace GFSDK
+{
+namespace SSAO
+{
+
+enum APIConventions
+{
+    API_D3D11,
+    API_GL
+};
+
+class ProjectionMatrixInfo
+{
+public:
+    ProjectionMatrixInfo()
+        : m_ZNear(0.f)
+        , m_ZFar(0.f)
+        , m_TanHalfFovX(0.f)
+        , m_TanHalfFovY(0.f)
+    {
+    }
+
+    GFSDK_SSAO_Status Init(const GFSDK_SSAO_Matrix& ProjectionMatrix, APIConventions API);
+    static bool IsValid(const GFSDK_SSAO_Matrix& ProjectionMatrix);
+
+    // Clamp to EPSILON to avoid any divisions by 0.f
+    float GetInverseZNear() const
+    {
+        return Max(1.f / m_ZNear, EPSILON);
+    }
+    float GetInverseZFar() const
+    {
+        return Max(1.f / m_ZFar, EPSILON);
+    }
+
+    float GetTanHalfFovX() const
+    {
+        return m_TanHalfFovX;
+    }
+    float GetTanHalfFovY() const
+    {
+        return m_TanHalfFovY;
+    }
+
+    void GetDepthRange(GFSDK_SSAO_ProjectionMatrixDepthRange* pDepthRange)
+    {
+        pDepthRange->ZNear = 1.f / GetInverseZNear();
+        pDepthRange->ZFar = 1.f / GetInverseZFar();
+    }
+
+private:
+    float m_ZNear;
+    float m_ZFar;
+    float m_TanHalfFovX;
+    float m_TanHalfFovY;
+};
+
+} // namespace SSAO
+} // namespace GFSDK
-- 
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