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-rw-r--r--indra/llmeshoptimizer/llmeshoptimizer.cpp339
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diff --git a/indra/llmeshoptimizer/llmeshoptimizer.cpp b/indra/llmeshoptimizer/llmeshoptimizer.cpp
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+ /**
+* @file llmeshoptimizer.cpp
+* @brief Wrapper around meshoptimizer
+*
+* $LicenseInfo:firstyear=2021&license=viewerlgpl$
+* Second Life Viewer Source Code
+* Copyright (C) 2021, 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
+* $/LicenseInfo$
+*/
+
+#include "llmeshoptimizer.h"
+
+#include "meshoptimizer.h"
+
+#include "llmath.h"
+#include "v2math.h"
+
+LLMeshOptimizer::LLMeshOptimizer()
+{
+ // Todo: Looks like for memory management, we can add allocator and deallocator callbacks
+ // Should be one time
+ // meshopt_setAllocator(allocate, deallocate);
+}
+
+LLMeshOptimizer::~LLMeshOptimizer()
+{
+}
+
+//static
+void LLMeshOptimizer::generateShadowIndexBufferU32(U32 *destination,
+ const U32 *indices,
+ U64 index_count,
+ const LLVector4a * vertex_positions,
+ const LLVector4a * normals,
+ const LLVector2 * text_coords,
+ U64 vertex_count
+)
+{
+ meshopt_Stream streams[3];
+
+ S32 index = 0;
+ if (vertex_positions)
+ {
+ streams[index].data = (const float*)vertex_positions;
+ // Despite being LLVector4a, only x, y and z are in use
+ streams[index].size = sizeof(F32) * 3;
+ streams[index].stride = sizeof(F32) * 4;
+ index++;
+ }
+ if (normals)
+ {
+ streams[index].data = (const float*)normals;
+ streams[index].size = sizeof(F32) * 3;
+ streams[index].stride = sizeof(F32) * 4;
+ index++;
+ }
+ if (text_coords)
+ {
+ streams[index].data = (const float*)text_coords;
+ streams[index].size = sizeof(F32) * 2;
+ streams[index].stride = sizeof(F32) * 2;
+ index++;
+ }
+
+ if (index == 0)
+ {
+ // invalid
+ return;
+ }
+
+ meshopt_generateShadowIndexBufferMulti<unsigned int>(destination,
+ indices,
+ index_count,
+ vertex_count,
+ streams,
+ index
+ );
+}
+
+//static
+void LLMeshOptimizer::generateShadowIndexBufferU16(U16 *destination,
+ const U16 *indices,
+ U64 index_count,
+ const LLVector4a * vertex_positions,
+ const LLVector4a * normals,
+ const LLVector2 * text_coords,
+ U64 vertex_count
+)
+{
+ meshopt_Stream streams[3];
+
+ S32 index = 0;
+ if (vertex_positions)
+ {
+ streams[index].data = (const float*)vertex_positions;
+ streams[index].size = sizeof(F32) * 3;
+ streams[index].stride = sizeof(F32) * 4;
+ index++;
+ }
+ if (normals)
+ {
+ streams[index].data = (const float*)normals;
+ streams[index].size = sizeof(F32) * 3;
+ streams[index].stride = sizeof(F32) * 4;
+ index++;
+ }
+ if (text_coords)
+ {
+ streams[index].data = (const float*)text_coords;
+ streams[index].size = sizeof(F32) * 2;
+ streams[index].stride = sizeof(F32) * 2;
+ index++;
+ }
+
+ if (index == 0)
+ {
+ // invalid
+ return;
+ }
+
+ meshopt_generateShadowIndexBufferMulti<unsigned short>(destination,
+ indices,
+ index_count,
+ vertex_count,
+ streams,
+ index);
+}
+
+void LLMeshOptimizer::optimizeVertexCacheU32(U32 * destination, const U32 * indices, U64 index_count, U64 vertex_count)
+{
+ meshopt_optimizeVertexCache<unsigned int>(destination, indices, index_count, vertex_count);
+}
+
+void LLMeshOptimizer::optimizeVertexCacheU16(U16 * destination, const U16 * indices, U64 index_count, U64 vertex_count)
+{
+ meshopt_optimizeVertexCache<unsigned short>(destination, indices, index_count, vertex_count);
+}
+
+size_t LLMeshOptimizer::generateRemapMultiU32(
+ unsigned int* remap,
+ const U32 * indices,
+ U64 index_count,
+ const LLVector4a * vertex_positions,
+ const LLVector4a * normals,
+ const LLVector2 * text_coords,
+ U64 vertex_count)
+{
+ meshopt_Stream streams[] = {
+ {(const float*)vertex_positions, sizeof(F32) * 3, sizeof(F32) * 4},
+ {(const float*)normals, sizeof(F32) * 3, sizeof(F32) * 4},
+ {(const float*)text_coords, sizeof(F32) * 2, sizeof(F32) * 2},
+ };
+
+ // Remap can function without indices,
+ // but providing indices helps with removing unused vertices
+ U64 indeces_cmp = indices ? index_count : vertex_count;
+
+ // meshopt_generateVertexRemapMulti will throw an assert if (indices[i] >= vertex_count)
+ return meshopt_generateVertexRemapMulti(&remap[0], indices, indeces_cmp, vertex_count, streams, sizeof(streams) / sizeof(streams[0]));
+}
+
+size_t LLMeshOptimizer::generateRemapMultiU16(
+ unsigned int* remap,
+ const U16 * indices,
+ U64 index_count,
+ const LLVector4a * vertex_positions,
+ const LLVector4a * normals,
+ const LLVector2 * text_coords,
+ U64 vertex_count)
+{
+ S32 out_of_range_count = 0;
+ U32* indices_u32 = NULL;
+ if (indices)
+ {
+ indices_u32 = (U32*)ll_aligned_malloc_32(index_count * sizeof(U32));
+ for (U64 i = 0; i < index_count; i++)
+ {
+ if (indices[i] < vertex_count)
+ {
+ indices_u32[i] = (U32)indices[i];
+ }
+ else
+ {
+ out_of_range_count++;
+ indices_u32[i] = 0;
+ }
+ }
+ }
+
+ if (out_of_range_count)
+ {
+ LL_WARNS() << out_of_range_count << " indices are out of range." << LL_ENDL;
+ }
+
+ size_t unique = generateRemapMultiU32(remap, indices_u32, index_count, vertex_positions, normals, text_coords, vertex_count);
+
+ ll_aligned_free_32(indices_u32);
+
+ return unique;
+}
+
+void LLMeshOptimizer::remapIndexBufferU32(U32 * destination_indices,
+ const U32 * indices,
+ U64 index_count,
+ const unsigned int* remap)
+{
+ meshopt_remapIndexBuffer<unsigned int>(destination_indices, indices, index_count, remap);
+}
+
+void LLMeshOptimizer::remapIndexBufferU16(U16 * destination_indices,
+ const U16 * indices,
+ U64 index_count,
+ const unsigned int* remap)
+{
+ meshopt_remapIndexBuffer<unsigned short>(destination_indices, indices, index_count, remap);
+}
+
+void LLMeshOptimizer::remapPositionsBuffer(LLVector4a * destination_vertices,
+ const LLVector4a * vertex_positions,
+ U64 vertex_count,
+ const unsigned int* remap)
+{
+ meshopt_remapVertexBuffer((float*)destination_vertices, (const float*)vertex_positions, vertex_count, sizeof(LLVector4a), remap);
+}
+
+void LLMeshOptimizer::remapNormalsBuffer(LLVector4a * destination_normalss,
+ const LLVector4a * normals,
+ U64 mormals_count,
+ const unsigned int* remap)
+{
+ meshopt_remapVertexBuffer((float*)destination_normalss, (const float*)normals, mormals_count, sizeof(LLVector4a), remap);
+}
+
+void LLMeshOptimizer::remapUVBuffer(LLVector2 * destination_uvs,
+ const LLVector2 * uv_positions,
+ U64 uv_count,
+ const unsigned int* remap)
+{
+ meshopt_remapVertexBuffer((float*)destination_uvs, (const float*)uv_positions, uv_count, sizeof(LLVector2), remap);
+}
+
+//static
+U64 LLMeshOptimizer::simplifyU32(U32 *destination,
+ const U32 *indices,
+ U64 index_count,
+ const LLVector4a *vertex_positions,
+ U64 vertex_count,
+ U64 vertex_positions_stride,
+ U64 target_index_count,
+ F32 target_error,
+ bool sloppy,
+ F32* result_error
+)
+{
+ if (sloppy)
+ {
+ return meshopt_simplifySloppy<unsigned int>(destination,
+ indices,
+ index_count,
+ (const float*)vertex_positions,
+ vertex_count,
+ vertex_positions_stride,
+ target_index_count,
+ target_error,
+ result_error
+ );
+ }
+ else
+ {
+ return meshopt_simplify<unsigned int>(destination,
+ indices,
+ index_count,
+ (const float*)vertex_positions,
+ vertex_count,
+ vertex_positions_stride,
+ target_index_count,
+ target_error,
+ result_error
+ );
+ }
+}
+
+//static
+U64 LLMeshOptimizer::simplify(U16 *destination,
+ const U16 *indices,
+ U64 index_count,
+ const LLVector4a *vertex_positions,
+ U64 vertex_count,
+ U64 vertex_positions_stride,
+ U64 target_index_count,
+ F32 target_error,
+ bool sloppy,
+ F32* result_error
+ )
+{
+ if (sloppy)
+ {
+ return meshopt_simplifySloppy<unsigned short>(destination,
+ indices,
+ index_count,
+ (const float*)vertex_positions,
+ vertex_count,
+ vertex_positions_stride,
+ target_index_count,
+ target_error,
+ result_error
+ );
+ }
+ else
+ {
+ return meshopt_simplify<unsigned short>(destination,
+ indices,
+ index_count,
+ (const float*)vertex_positions,
+ vertex_count,
+ vertex_positions_stride,
+ target_index_count,
+ target_error,
+ result_error
+ );
+ }
+}
+
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