1 files changed, 175 insertions, 0 deletions

diff --git a/OpenSim/Region/Physics/BulletSNPlugin/BSTerrainHeightmap.cs b/OpenSim/Region/Physics/BulletSNPlugin/BSTerrainHeightmap.cs
new file mode 100644
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+++ b/OpenSim/Region/Physics/BulletSNPlugin/BSTerrainHeightmap.cs
@@ -0,0 +1,175 @@
+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyrightD
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSimulator Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+using OpenSim.Framework;
+using OpenSim.Region.Framework;
+using OpenSim.Region.CoreModules;
+using OpenSim.Region.Physics.Manager;
+
+using Nini.Config;
+using log4net;
+
+using OpenMetaverse;
+
+namespace OpenSim.Region.Physics.BulletSNPlugin
+{
+public sealed class BSTerrainHeightmap : BSTerrainPhys
+{
+    static string LogHeader = "[BULLETSIM TERRAIN HEIGHTMAP]";
+
+    BulletHeightMapInfo m_mapInfo = null;
+
+    // Constructor to build a default, flat heightmap terrain.
+    public BSTerrainHeightmap(BSScene physicsScene, Vector3 regionBase, uint id, Vector3 regionSize)
+        : base(physicsScene, regionBase, id)
+    {
+        Vector3 minTerrainCoords = new Vector3(0f, 0f, BSTerrainManager.HEIGHT_INITIALIZATION - BSTerrainManager.HEIGHT_EQUAL_FUDGE);
+        Vector3 maxTerrainCoords = new Vector3(regionSize.X, regionSize.Y, BSTerrainManager.HEIGHT_INITIALIZATION);
+        int totalHeights = (int)maxTerrainCoords.X * (int)maxTerrainCoords.Y;
+        float[] initialMap = new float[totalHeights];
+        for (int ii = 0; ii < totalHeights; ii++)
+        {
+            initialMap[ii] = BSTerrainManager.HEIGHT_INITIALIZATION;
+        }
+        m_mapInfo = new BulletHeightMapInfo(id, initialMap, null);
+        m_mapInfo.minCoords = minTerrainCoords;
+        m_mapInfo.maxCoords = maxTerrainCoords;
+        m_mapInfo.terrainRegionBase = TerrainBase;
+        // Don't have to free any previous since we just got here.
+        BuildHeightmapTerrain();
+    }
+
+    // This minCoords and maxCoords passed in give the size of the terrain (min and max Z
+    //         are the high and low points of the heightmap).
+    public BSTerrainHeightmap(BSScene physicsScene, Vector3 regionBase, uint id, float[] initialMap, 
+                                                    Vector3 minCoords, Vector3 maxCoords)
+        : base(physicsScene, regionBase, id)
+    {
+        m_mapInfo = new BulletHeightMapInfo(id, initialMap, null);
+        m_mapInfo.minCoords = minCoords;
+        m_mapInfo.maxCoords = maxCoords;
+        m_mapInfo.minZ = minCoords.Z;
+        m_mapInfo.maxZ = maxCoords.Z;
+        m_mapInfo.terrainRegionBase = TerrainBase;
+
+        // Don't have to free any previous since we just got here.
+        BuildHeightmapTerrain();
+    }
+
+    public override void Dispose()
+    {
+        ReleaseHeightMapTerrain();
+    }
+
+    // Using the information in m_mapInfo, create the physical representation of the heightmap.
+    private void BuildHeightmapTerrain()
+    {
+        m_mapInfo.Ptr = BulletSimAPI.CreateHeightMapInfo2(PhysicsScene.World.ptr, m_mapInfo.ID,
+                                m_mapInfo.minCoords, m_mapInfo.maxCoords, 
+                                m_mapInfo.heightMap, BSParam.TerrainCollisionMargin);
+
+        // Create the terrain shape from the mapInfo
+        m_mapInfo.terrainShape = new BulletShape(BulletSimAPI.CreateTerrainShape2(m_mapInfo.Ptr),
+                                                    BSPhysicsShapeType.SHAPE_TERRAIN);
+
+        // The terrain object initial position is at the center of the object
+        Vector3 centerPos;
+        centerPos.X = m_mapInfo.minCoords.X + (m_mapInfo.sizeX / 2f);
+        centerPos.Y = m_mapInfo.minCoords.Y + (m_mapInfo.sizeY / 2f);
+        centerPos.Z = m_mapInfo.minZ + ((m_mapInfo.maxZ - m_mapInfo.minZ) / 2f + 0.5f);
+
+        m_mapInfo.terrainBody = new BulletBody(m_mapInfo.ID,
+                BulletSimAPI.CreateBodyWithDefaultMotionState2(m_mapInfo.terrainShape.ptr,
+                                            m_mapInfo.ID, centerPos, Quaternion.Identity));
+
+        // Set current terrain attributes
+        BulletSimAPI.SetFriction2(m_mapInfo.terrainBody.ptr, BSParam.TerrainFriction);
+        BulletSimAPI.SetHitFraction2(m_mapInfo.terrainBody.ptr, BSParam.TerrainHitFraction);
+        BulletSimAPI.SetRestitution2(m_mapInfo.terrainBody.ptr, BSParam.TerrainRestitution);
+        BulletSimAPI.SetCollisionFlags2(m_mapInfo.terrainBody.ptr, CollisionFlags.CF_STATIC_OBJECT);
+
+        // Return the new terrain to the world of physical objects
+        BulletSimAPI.AddObjectToWorld2(PhysicsScene.World.ptr, m_mapInfo.terrainBody.ptr, centerPos, Quaternion.Identity);
+
+        // redo its bounding box now that it is in the world
+        BulletSimAPI.UpdateSingleAabb2(PhysicsScene.World.ptr, m_mapInfo.terrainBody.ptr);
+
+        m_mapInfo.terrainBody.collisionType = CollisionType.Terrain;
+        m_mapInfo.terrainBody.ApplyCollisionMask();
+
+        // Make it so the terrain will not move or be considered for movement.
+        BulletSimAPI.ForceActivationState2(m_mapInfo.terrainBody.ptr, ActivationState.DISABLE_SIMULATION);
+
+        return;
+    }
+
+    // If there is information in m_mapInfo pointing to physical structures, release same.
+    private void ReleaseHeightMapTerrain()
+    {
+        if (m_mapInfo != null)
+        {
+            if (m_mapInfo.terrainBody.HasPhysicalBody)
+            {
+                BulletSimAPI.RemoveObjectFromWorld2(PhysicsScene.World.ptr, m_mapInfo.terrainBody.ptr);
+                // Frees both the body and the shape.
+                BulletSimAPI.DestroyObject2(PhysicsScene.World.ptr, m_mapInfo.terrainBody.ptr);
+                BulletSimAPI.ReleaseHeightMapInfo2(m_mapInfo.Ptr);
+            }
+        }
+        m_mapInfo = null;
+    }
+
+    // The passed position is relative to the base of the region.
+    public override float GetTerrainHeightAtXYZ(Vector3 pos)
+    {
+        float ret = BSTerrainManager.HEIGHT_GETHEIGHT_RET;
+
+        int mapIndex = (int)pos.Y * (int)m_mapInfo.sizeY + (int)pos.X;
+        try
+        {
+            ret = m_mapInfo.heightMap[mapIndex];
+        }
+        catch
+        {
+            // Sometimes they give us wonky values of X and Y. Give a warning and return something.
+            PhysicsScene.Logger.WarnFormat("{0} Bad request for terrain height. terrainBase={1}, pos={2}",
+                                LogHeader, m_mapInfo.terrainRegionBase, pos);
+            ret = BSTerrainManager.HEIGHT_GETHEIGHT_RET;
+        }
+        return ret;
+    }
+
+    // The passed position is relative to the base of the region.
+    public override float GetWaterLevelAtXYZ(Vector3 pos)
+    {
+        return PhysicsScene.SimpleWaterLevel;
+    }
+}
+}