From f91363ff0610e166c576e957542264ea1287edc8 Mon Sep 17 00:00:00 2001
From: Mikko Mononen <memononen@gmail.com>
Date: Mon, 27 Feb 2012 19:02:16 +0000
Subject: [PATCH] Added rcCopyPolyMesh function.

---
 Recast/Include/Recast.h      |  8 +++++
 Recast/Source/RecastMesh.cpp | 64 ++++++++++++++++++++++++++++++++++++
 2 files changed, 72 insertions(+)

diff --git a/Recast/Include/Recast.h b/Recast/Include/Recast.h
index eb1a17d..a9032e1 100644
--- a/Recast/Include/Recast.h
+++ b/Recast/Include/Recast.h
@@ -1092,6 +1092,14 @@ bool rcBuildPolyMeshDetail(rcContext* ctx, const rcPolyMesh& mesh, const rcCompa
 						   const float sampleDist, const float sampleMaxError,
 						   rcPolyMeshDetail& dmesh);
 
+/// Copies the poly mesh data from src to dst.
+///  @ingroup recast
+///  @param[in,out]	ctx		The build context to use during the operation.
+///  @param[in]		src		The source mesh to copy from.
+///  @param[out]	dst		The resulting detail mesh. (Must be pre-allocated, must be empty mesh.)
+///  @returns True if the operation completed successfully.
+bool rcCopyPolyMesh(rcContext* ctx, const rcPolyMesh& src, rcPolyMesh& dst);
+
 /// Merges multiple detail meshes into a single detail mesh.
 ///  @ingroup recast
 ///  @param[in,out]	ctx		The build context to use during the operation.
diff --git a/Recast/Source/RecastMesh.cpp b/Recast/Source/RecastMesh.cpp
index 2310e34..04be98f 100644
--- a/Recast/Source/RecastMesh.cpp
+++ b/Recast/Source/RecastMesh.cpp
@@ -1390,3 +1390,67 @@ bool rcMergePolyMeshes(rcContext* ctx, rcPolyMesh** meshes, const int nmeshes, r
 	
 	return true;
 }
+
+bool rcCopyPolyMesh(rcContext* ctx, const rcPolyMesh& src, rcPolyMesh& dst)
+{
+	rcAssert(ctx);
+	
+	// Destination must be empty.
+	rcAssert(dst.verts == 0);
+	rcAssert(dst.polys == 0);
+	rcAssert(dst.regs == 0);
+	rcAssert(dst.areas == 0);
+	rcAssert(dst.flags == 0);
+	
+	dst.nverts = src.nverts;
+	dst.npolys = src.npolys;
+	dst.maxpolys = src.npolys;
+	dst.nvp = src.nvp;
+	rcVcopy(dst.bmin, src.bmin);
+	rcVcopy(dst.bmax, src.bmax);
+	dst.cs = src.cs;
+	dst.ch = src.ch;
+	dst.borderSize = src.borderSize;
+	
+	dst.verts = (unsigned short*)rcAlloc(sizeof(unsigned short)*src.nverts*3, RC_ALLOC_PERM);
+	if (!dst.verts)
+	{
+		ctx->log(RC_LOG_ERROR, "rcCopyPolyMesh: Out of memory 'dst.verts' (%d).", src.nverts*3);
+		return false;
+	}
+	memcpy(dst.verts, src.verts, sizeof(unsigned short)*src.nverts*3);
+	
+	dst.polys = (unsigned short*)rcAlloc(sizeof(unsigned short)*src.npolys*2*src.nvp, RC_ALLOC_PERM);
+	if (!dst.polys)
+	{
+		ctx->log(RC_LOG_ERROR, "rcCopyPolyMesh: Out of memory 'dst.polys' (%d).", src.npolys*2*src.nvp);
+		return false;
+	}
+	memcpy(dst.polys, src.polys, sizeof(unsigned short)*src.npolys*2*src.nvp);
+	
+	dst.regs = (unsigned short*)rcAlloc(sizeof(unsigned short)*src.npolys, RC_ALLOC_PERM);
+	if (!dst.regs)
+	{
+		ctx->log(RC_LOG_ERROR, "rcCopyPolyMesh: Out of memory 'dst.regs' (%d).", src.npolys);
+		return false;
+	}
+	memcpy(dst.regs, src.regs, sizeof(unsigned short)*src.npolys);
+	
+	dst.areas = (unsigned char*)rcAlloc(sizeof(unsigned char)*src.npolys, RC_ALLOC_PERM);
+	if (!dst.areas)
+	{
+		ctx->log(RC_LOG_ERROR, "rcCopyPolyMesh: Out of memory 'dst.areas' (%d).", src.npolys);
+		return false;
+	}
+	memcpy(dst.areas, src.areas, sizeof(unsigned char)*src.npolys);
+	
+	dst.flags = (unsigned short*)rcAlloc(sizeof(unsigned short)*src.npolys, RC_ALLOC_PERM);
+	if (!dst.flags)
+	{
+		ctx->log(RC_LOG_ERROR, "rcCopyPolyMesh: Out of memory 'dst.flags' (%d).", src.npolys);
+		return false;
+	}
+	memcpy(dst.flags, src.flags, sizeof(unsigned char)*src.npolys);
+	
+	return true;
+}