Engine directory for ticket #1

Engine/source/scene/sgUtil.h

@@ -0,0 +1,75 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) 2012 GarageGames, LLC
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER 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.
+//-----------------------------------------------------------------------------
+
+#ifndef _SGUTIL_H_
+#define _SGUTIL_H_
+
+#ifndef _PLATFORM_H_
+#include "platform/platform.h"
+#endif
+#ifndef _MPOINT3_H_
+#include "math/mPoint3.h"
+#endif
+
+class Frustum;
+class RectI;
+class MatrixF;
+class PlaneF;
+
+struct SGWinding
+{
+   Point3F points[32];
+   U32     numPoints;
+};
+
+bool sgComputeNewFrustum(const Frustum    &oldFrustum,
+                         const F64        nearPlane,
+                         const F64        farPlane,
+                         const RectI&     oldViewport,
+                         const SGWinding* windings,
+                         const U32        numWindings,
+                         const MatrixF&   modelview,
+                         F64              *newFrustum,
+                         RectI&           newViewport,
+                         const bool       flippedMatrix);
+
+/// Compute frustrum planes.
+///
+/// Frustum parameters are:
+///  - [0] = left
+///  - [1] = right
+///  - [2] = top
+///  - [3] = bottom
+///  - [4] = near
+///  - [5] = far
+void sgComputeOSFrustumPlanes(const F64      frustumParameters[6],
+                              const MatrixF& worldSpaceToObjectSpace,
+                              const Point3F& wsCamPoint,
+                              PlaneF&        outFarPlane,
+                              PlaneF&        outXMinPlane,
+                              PlaneF&        outXMaxPlane,
+                              PlaneF&        outYMinPlane,
+                              PlaneF&        outYMaxPlane);
+
+void sgOrientClipPlanes(PlaneF * planes, const Point3F & camPos, const Point3F & leftUp, const Point3F & leftDown, const Point3F & rightUp, const Point3F & rightDown);
+
+#endif  // _H_SGUTIL_