Merge remote-tracking branch 'origin/DRTVWR-546' into DRTVWR-559

3 files changed, 269 insertions, 0 deletions

diff --git a/indra/llmeshoptimizer/CMakeLists.txt b/indra/llmeshoptimizer/CMakeLists.txt
new file mode 100644
index 0000000000..016794cfad
--- /dev/null
+++ b/indra/llmeshoptimizer/CMakeLists.txt
@@ -0,0 +1,44 @@
+# -*- cmake -*-
+
+project(llmeshoptimizer)
+
+include(MESHOPTIMIZER)
+
+include(00-Common)
+include(LLCommon)
+include(LLMath)
+
+include_directories(
+    ${LLCOMMON_INCLUDE_DIRS}
+    ${LLMATH_INCLUDE_DIRS}
+    ${LLMESHOPTIMIZER_INCLUDE_DIR}
+    ${MESHOPTIMIZER_INCLUDE_DIRS}
+    ${LIBS_PREBUILT_DIR}/include  #access to boost headers, needed for LLError
+    )
+
+set(llmeshoptimizer_SOURCE_FILES
+    llmeshoptimizer.cpp
+    )
+
+set(llmeshoptimizer_HEADER_FILES
+    CMakeLists.txt
+
+    llmeshoptimizer.h
+    )
+
+set_source_files_properties(${llmeshoptimizer_HEADER_FILES}
+                            PROPERTIES HEADER_FILE_ONLY TRUE)
+
+list(APPEND llmeshoptimizer_SOURCE_FILES ${llmeshoptimizer_HEADER_FILES})
+
+#if (USE_MESHOPT)
+  add_library (llmeshoptimizer ${llmeshoptimizer_SOURCE_FILES})
+
+  target_link_libraries(llmeshoptimizer
+    ${LLCOMMON_LIBRARIES}
+    ${LLMATH_LIBRARIES}
+    ${MESHOPTIMIZER_LIBRARIES})
+  
+  # Add tests
+
+#endif (USE_MESHOPT)
diff --git a/indra/llmeshoptimizer/llmeshoptimizer.cpp b/indra/llmeshoptimizer/llmeshoptimizer.cpp
new file mode 100644
index 0000000000..a879389c5a
--- /dev/null
+++ b/indra/llmeshoptimizer/llmeshoptimizer.cpp
@@ -0,0 +1,142 @@
+ /** 
+* @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"
+
+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::generateShadowIndexBuffer(U16 *destination,
+    const U16 *indices,
+    U64 index_count,
+    const LLVector4a *vertex_positions,
+    U64 vertex_count,
+    U64 vertex_positions_stride
+)
+{
+    meshopt_generateShadowIndexBuffer<unsigned short>(destination,
+        indices,
+        index_count,
+        (const float*)vertex_positions, // verify that it is correct to convert to float
+        vertex_count,
+        sizeof(LLVector4a),
+        vertex_positions_stride
+        );
+}
+
+//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
+            );
+    }
+}
+
diff --git a/indra/llmeshoptimizer/llmeshoptimizer.h b/indra/llmeshoptimizer/llmeshoptimizer.h
new file mode 100644
index 0000000000..e8dd16dae9
--- /dev/null
+++ b/indra/llmeshoptimizer/llmeshoptimizer.h
@@ -0,0 +1,83 @@
+/** 
+* @file llmeshoptimizer.h
+* @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
+* $/LicenseInfo$
+*/
+#ifndef LLMESHOPTIMIZER_H
+#define LLMESHOPTIMIZER_H
+
+#include "linden_common.h"
+
+#include "llmath.h"
+
+class LLMeshOptimizer
+{
+public:
+    LLMeshOptimizer();
+    ~LLMeshOptimizer();
+
+    static void generateShadowIndexBuffer(
+        U16 *destination,
+        const U16 *indices,
+        U64 index_count,
+        const LLVector4a *vertex_positions,
+        U64 vertex_count,
+        U64 vertex_positions_stride);
+
+    // returns amount of indices in destiantion
+    // sloppy engages a variant of a mechanizm that does not respect topology as much
+    // but is much more efective for simpler models
+    // result_error returns how far from original the model is in % if not NULL
+    // Works with U32 indices (LLFace uses U16 indices)
+    static U64 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);
+
+    // Returns amount of indices in destiantion
+    // sloppy engages a variant of a mechanizm that does not respect topology as much
+    // but is much better for simpler models
+    // result_error returns how far from original the model is in % if not NULL
+    // Meant for U16 indices (LLFace uses U16 indices)
+    static U64 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);
+private:
+};
+
+#endif //LLMESHOPTIMIZER_H