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+/**
+ * @file llphysicsshapebuilder.h
+ * @brief Generic system to convert LL(Physics)VolumeParams to physics shapes
+ *
+ * $LicenseInfo:firstyear=2001&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ *
+ * 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;
+ * version 2.1 of the License only.
+ *
+ * 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 Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_PHYSICS_SHAPE_BUILDER_H
+#define LL_PHYSICS_SHAPE_BUILDER_H
+
+#include "indra_constants.h"
+#include "llvolume.h"
+
+#define USE_SHAPE_QUANTIZATION 0
+
+#define SHAPE_BUILDER_DEFAULT_VOLUME_DETAIL 1
+
+#define SHAPE_BUILDER_IMPLICIT_THRESHOLD_HOLLOW 0.10f
+#define SHAPE_BUILDER_IMPLICIT_THRESHOLD_HOLLOW_SPHERES 0.90f
+#define SHAPE_BUILDER_IMPLICIT_THRESHOLD_PATH_CUT 0.05f
+#define SHAPE_BUILDER_IMPLICIT_THRESHOLD_TAPER 0.05f
+#define SHAPE_BUILDER_IMPLICIT_THRESHOLD_TWIST 0.09f
+#define SHAPE_BUILDER_IMPLICIT_THRESHOLD_SHEAR 0.05f
+
+const F32 SHAPE_BUILDER_ENTRY_SNAP_SCALE_BIN_SIZE = 0.15f;
+const F32 SHAPE_BUILDER_ENTRY_SNAP_PARAMETER_BIN_SIZE = 0.010f;
+const F32 SHAPE_BUILDER_CONVEXIFICATION_SIZE = 2.f * COLLISION_TOLERANCE;
+const F32 SHAPE_BUILDER_MIN_GEOMETRY_SIZE = 0.5f * COLLISION_TOLERANCE;
+
+class LLPhysicsVolumeParams : public LLVolumeParams
+{
+public:
+
+ LLPhysicsVolumeParams( const LLVolumeParams& params, bool forceConvex ) :
+ LLVolumeParams( params ),
+ mForceConvex(forceConvex) {}
+
+ bool operator==(const LLPhysicsVolumeParams &params) const
+ {
+ return ( LLVolumeParams::operator==(params) && (mForceConvex == params.mForceConvex) );
+ }
+
+ bool operator!=(const LLPhysicsVolumeParams &params) const
+ {
+ return !operator==(params);
+ }
+
+ bool operator<(const LLPhysicsVolumeParams &params) const
+ {
+ if ( LLVolumeParams::operator!=(params) )
+ {
+ return LLVolumeParams::operator<(params);
+ }
+ return (params.mForceConvex == false) && (mForceConvex == true);
+ }
+
+ bool shouldForceConvex() const { return mForceConvex; }
+
+private:
+ bool mForceConvex;
+};
+
+
+class LLPhysicsShapeBuilderUtil
+{
+public:
+
+ class PhysicsShapeSpecification
+ {
+ public:
+ enum ShapeType
+ {
+ // Primitive types
+ BOX,
+ SPHERE,
+ CYLINDER,
+
+ USER_CONVEX, // User specified they wanted the convex hull of the volume
+
+ PRIM_CONVEX, // Either a volume that is inherently convex but not a primitive type, or a shape
+ // with dimensions such that will convexify it anyway.
+
+ SCULPT, // Special case for traditional sculpts--they are the convex hull of a single particular set of volume params
+
+ USER_MESH, // A user mesh. May or may not contain a convex decomposition.
+
+ PRIM_MESH, // A non-convex volume which we have to represent accurately
+
+ INVALID
+ };
+
+ PhysicsShapeSpecification() :
+ mType( INVALID ),
+ mScale( 0.f, 0.f, 0.f ),
+ mCenter( 0.f, 0.f, 0.f ) {}
+
+ bool isConvex() { return (mType != USER_MESH && mType != PRIM_MESH && mType != INVALID); }
+ bool isMesh() { return (mType == USER_MESH) || (mType == PRIM_MESH); }
+
+ ShapeType getType() { return mType; }
+ const LLVector3& getScale() { return mScale; }
+ const LLVector3& getCenter() { return mCenter; }
+
+ private:
+ friend class LLPhysicsShapeBuilderUtil;
+
+ ShapeType mType;
+
+ // Dimensions of an AABB around the shape
+ LLVector3 mScale;
+
+ // Offset of shape from origin of primitive's reference frame
+ LLVector3 mCenter;
+ };
+
+ static void determinePhysicsShape( const LLPhysicsVolumeParams& volume_params, const LLVector3& scale, PhysicsShapeSpecification& specOut );
+};
+
+#endif //LL_PHYSICS_SHAPE_BUILDER_H