SL-17475 Remap models before simplification

2 files changed, 227 insertions, 13 deletions

diff --git a/indra/llmeshoptimizer/llmeshoptimizer.cpp b/indra/llmeshoptimizer/llmeshoptimizer.cpp
index a879389c5a..8570887ddd 100644
--- a/indra/llmeshoptimizer/llmeshoptimizer.cpp
+++ b/indra/llmeshoptimizer/llmeshoptimizer.cpp
@@ -28,6 +28,9 @@
 
 #include "meshoptimizer.h"
 
+#include "llmath.h"
+#include "v2math.h"
+
 LLMeshOptimizer::LLMeshOptimizer()
 {
     // Todo: Looks like for memory management, we can add allocator and deallocator callbacks
@@ -40,25 +43,174 @@ LLMeshOptimizer::~LLMeshOptimizer()
 }
 
 //static
-void LLMeshOptimizer::generateShadowIndexBuffer(U16 *destination,
-    const U16 *indices,
+void LLMeshOptimizer::generateShadowIndexBufferU32(U32 *destination,
+    const U32 *indices,
     U64 index_count,
-    const LLVector4a *vertex_positions,
-    U64 vertex_count,
-    U64 vertex_positions_stride
+    const LLVector4a * vertex_positions,
+    const LLVector4a * normals,
+    const LLVector2 * text_coords,
+    U64 vertex_count
 )
 {
-    meshopt_generateShadowIndexBuffer<unsigned short>(destination,
+    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,
-        (const float*)vertex_positions, // verify that it is correct to convert to float
         vertex_count,
-        sizeof(LLVector4a),
-        vertex_positions_stride
+        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::generateRemapMulti(
+    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},
+    };
+
+    return meshopt_generateVertexRemapMulti(&remap[0], indices, index_count, vertex_count, streams, sizeof(streams) / sizeof(streams[0]));
+}
+
+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,
diff --git a/indra/llmeshoptimizer/llmeshoptimizer.h b/indra/llmeshoptimizer/llmeshoptimizer.h
index e8dd16dae9..c76f8a5a89 100644
--- a/indra/llmeshoptimizer/llmeshoptimizer.h
+++ b/indra/llmeshoptimizer/llmeshoptimizer.h
@@ -28,7 +28,8 @@
 
 #include "linden_common.h"
 
-#include "llmath.h"
+class LLVector4a;
+class LLVector2;
 
 class LLMeshOptimizer
 {
@@ -36,13 +37,74 @@ public:
     LLMeshOptimizer();
     ~LLMeshOptimizer();
 
-    static void generateShadowIndexBuffer(
+    static void generateShadowIndexBufferU32(
+        U32 *destination,
+        const U32 *indices,
+        U64 index_count,
+        const LLVector4a * vertex_positions,
+        const LLVector4a * normals,
+        const LLVector2 * text_coords,
+        U64 vertex_count);
+
+    static void generateShadowIndexBufferU16(
         U16 *destination,
         const U16 *indices,
         U64 index_count,
-        const LLVector4a *vertex_positions,
+        const LLVector4a * vertex_positions,
+        const LLVector4a * normals,
+        const LLVector2 * text_coords,
+        U64 vertex_count);
+
+    static void optimizeVertexCacheU32(
+        U32 *destination,
+        const U32 *indices,
+        U64 index_count,
+        U64 vertex_count);
+
+    static void optimizeVertexCacheU16(
+        U16 *destination,
+        const U16 *indices,
+        U64 index_count,
+        U64 vertex_count);
+
+    // Remap functions
+
+    static size_t generateRemapMulti(
+        unsigned int* remap,
+        const U32 * indices,
+        U64 index_count,
+        const LLVector4a * vertex_positions,
+        const LLVector4a * normals,
+        const LLVector2 * text_coords,
+        U64 vertex_count);
+
+    static void remapIndexBufferU32(U32 * destination_indices,
+        const U32 * indices,
+        U64 index_count,
+        const unsigned int* remap);
+
+    static void remapIndexBufferU16(U16 * destination_indices,
+        const U16 * indices,
+        U64 index_count,
+        const unsigned int* remap);
+
+
+    static void remapPositionsBuffer(LLVector4a * destination_vertices,
+        const LLVector4a * vertex_positions,
         U64 vertex_count,
-        U64 vertex_positions_stride);
+        const unsigned int* remap);
+
+    static void remapNormalsBuffer(LLVector4a * destination_normalss,
+        const LLVector4a * normals,
+        U64 mormals_count,
+        const unsigned int* remap);
+
+    static void remapUVBuffer(LLVector2 * destination_uvs,
+        const LLVector2 * uv_positions,
+        U64 uv_count,
+        const unsigned int* remap);
+
+    // Simplification
 
     // returns amount of indices in destiantion
     // sloppy engages a variant of a mechanizm that does not respect topology as much