3 files changed, 52 insertions, 0 deletions
diff --git a/indra/llmath/CMakeLists.txt b/indra/llmath/CMakeLists.txt
index 552e820127..4617309606 100644
--- a/indra/llmath/CMakeLists.txt
+++ b/indra/llmath/CMakeLists.txt
@@ -4,12 +4,14 @@ project(llmath)
 
 include(00-Common)
 include(LLCommon)
+include(LLMeshOptimizer)
 include(bugsplat)
 include(Boost)
 
 include_directories(
     ${LLCOMMON_INCLUDE_DIRS}
     ${LLCOMMON_SYSTEM_INCLUDE_DIRS}
+    ${LLMESHOPTIMIZER_INCLUDE_DIRS}
     )
 
 set(llmath_SOURCE_FILES
@@ -109,6 +111,7 @@ add_library (llmath ${llmath_SOURCE_FILES})
 
 target_link_libraries(llmath
     ${LLCOMMON_LIBRARIES}
+    ${LLMESHOPTIMIZER_LIBRARIES}
     )
 
 # Add tests
diff --git a/indra/llmath/llvolume.cpp b/indra/llmath/llvolume.cpp
index 5de1fe5a8d..3c90aa2963 100644
--- a/indra/llmath/llvolume.cpp
+++ b/indra/llmath/llvolume.cpp
@@ -49,6 +49,7 @@
 #include "llsdserialize.h"
 #include "llvector4a.h"
 #include "llmatrix4a.h"
+#include "llmeshoptimizer.h"
 #include "lltimer.h"
 
 #define DEBUG_SILHOUETTE_BINORMALS 0
@@ -4953,6 +4954,50 @@ bool LLVolumeFace::VertexMapData::ComparePosition::operator()(const LLVector3& a
 	return a.mV[2] < b.mV[2];
 }
 
+void LLVolumeFace::remap()
+{
+    // Generate a remap buffer
+    std::vector<unsigned int> remap(mNumVertices);
+    S32 remap_vertices_count = LLMeshOptimizer::generateRemapMultiU16(&remap[0],
+        mIndices,
+        mNumIndices,
+        mPositions,
+        mNormals,
+        mTexCoords,
+        mNumVertices);
+
+    // Allocate new buffers
+    S32 size = ((mNumIndices * sizeof(U16)) + 0xF) & ~0xF;
+    U16* remap_indices = (U16*)ll_aligned_malloc_16(size);
+
+    S32 tc_bytes_size = ((remap_vertices_count * sizeof(LLVector2)) + 0xF) & ~0xF;
+    LLVector4a* remap_positions = (LLVector4a*)ll_aligned_malloc<64>(sizeof(LLVector4a) * 2 * remap_vertices_count + tc_bytes_size);
+    LLVector4a* remap_normals = remap_positions + remap_vertices_count;
+    LLVector2* remap_tex_coords = (LLVector2*)(remap_normals + remap_vertices_count);
+
+    // Fill the buffers
+    LLMeshOptimizer::remapIndexBufferU16(remap_indices, mIndices, mNumIndices, &remap[0]);
+    LLMeshOptimizer::remapPositionsBuffer(remap_positions, mPositions, mNumVertices, &remap[0]);
+    LLMeshOptimizer::remapNormalsBuffer(remap_normals, mNormals, mNumVertices, &remap[0]);
+    LLMeshOptimizer::remapUVBuffer(remap_tex_coords, mTexCoords, mNumVertices, &remap[0]);
+
+    // Free unused buffers
+    ll_aligned_free_16(mIndices);
+    ll_aligned_free<64>(mPositions);
+
+    // Tangets are now invalid
+    ll_aligned_free_16(mTangents);
+    mTangents = NULL;
+
+    // Assign new values
+    mIndices = remap_indices;
+    mPositions = remap_positions;
+    mNormals = remap_normals;
+    mTexCoords = remap_tex_coords;
+    mNumVertices = remap_vertices_count;
+    mNumAllocatedVertices = remap_vertices_count;
+}
+
 void LLVolumeFace::optimize(F32 angle_cutoff)
 {
 	LLVolumeFace new_face;
diff --git a/indra/llmath/llvolume.h b/indra/llmath/llvolume.h
index a984aa127e..3ccaed47f1 100644
--- a/indra/llmath/llvolume.h
+++ b/indra/llmath/llvolume.h
@@ -903,6 +903,10 @@ public:
 		typedef std::map<LLVector3, std::vector<VertexMapData>, VertexMapData::ComparePosition > PointMap;
 	};
 
+    // Eliminates non unique triangles, takes positions,
+    // normals and texture coordinates into account.
+    void remap();
+
 	void optimize(F32 angle_cutoff = 2.f);
 	bool cacheOptimize();