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-rw-r--r--src/mesh.cpp640
-rw-r--r--src/mesh.h14
2 files changed, 654 insertions, 0 deletions
diff --git a/src/mesh.cpp b/src/mesh.cpp
index 38b3d97bc..e021e4c92 100644
--- a/src/mesh.cpp
+++ b/src/mesh.cpp
@@ -20,6 +20,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#include "mesh.h"
#include "debug.h"
#include "log.h"
+#include "irrMap.h"
#include <iostream>
#include <IAnimatedMesh.h>
#include <SAnimatedMesh.h>
@@ -197,6 +198,51 @@ void setMeshColorByNormalXYZ(scene::IMesh *mesh,
}
}
+void rotateMeshXYby (scene::IMesh *mesh, f64 degrees)
+{
+ u16 mc = mesh->getMeshBufferCount();
+ for(u16 j = 0; j < mc; j++)
+ {
+ scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
+ video::S3DVertex *vertices = (video::S3DVertex*)buf->getVertices();
+ u16 vc = buf->getVertexCount();
+ for(u16 i = 0; i < vc; i++)
+ {
+ vertices[i].Pos.rotateXYBy(degrees);
+ }
+ }
+}
+
+void rotateMeshXZby (scene::IMesh *mesh, f64 degrees)
+{
+ u16 mc = mesh->getMeshBufferCount();
+ for(u16 j = 0; j < mc; j++)
+ {
+ scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
+ video::S3DVertex *vertices = (video::S3DVertex*)buf->getVertices();
+ u16 vc = buf->getVertexCount();
+ for(u16 i = 0; i < vc; i++)
+ {
+ vertices[i].Pos.rotateXZBy(degrees);
+ }
+ }
+}
+
+void rotateMeshYZby (scene::IMesh *mesh, f64 degrees)
+{
+ u16 mc = mesh->getMeshBufferCount();
+ for(u16 j = 0; j < mc; j++)
+ {
+ scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
+ video::S3DVertex *vertices = (video::S3DVertex*)buf->getVertices();
+ u16 vc = buf->getVertexCount();
+ for(u16 i = 0; i < vc; i++)
+ {
+ vertices[i].Pos.rotateYZBy(degrees);
+ }
+ }
+}
+
void rotateMeshBy6dFacedir(scene::IMesh *mesh, int facedir)
{
int axisdir = facedir>>2;
@@ -414,3 +460,597 @@ scene::IMesh* convertNodeboxNodeToMesh(ContentFeatures *f)
}
return dst_mesh;
}
+
+struct vcache
+{
+ core::array<u32> tris;
+ float score;
+ s16 cachepos;
+ u16 NumActiveTris;
+};
+
+struct tcache
+{
+ u16 ind[3];
+ float score;
+ bool drawn;
+};
+
+const u16 cachesize = 32;
+
+float FindVertexScore(vcache *v)
+{
+ const float CacheDecayPower = 1.5f;
+ const float LastTriScore = 0.75f;
+ const float ValenceBoostScale = 2.0f;
+ const float ValenceBoostPower = 0.5f;
+ const float MaxSizeVertexCache = 32.0f;
+
+ if (v->NumActiveTris == 0)
+ {
+ // No tri needs this vertex!
+ return -1.0f;
+ }
+
+ float Score = 0.0f;
+ int CachePosition = v->cachepos;
+ if (CachePosition < 0)
+ {
+ // Vertex is not in FIFO cache - no score.
+ }
+ else
+ {
+ if (CachePosition < 3)
+ {
+ // This vertex was used in the last triangle,
+ // so it has a fixed score.
+ Score = LastTriScore;
+ }
+ else
+ {
+ // Points for being high in the cache.
+ const float Scaler = 1.0f / (MaxSizeVertexCache - 3);
+ Score = 1.0f - (CachePosition - 3) * Scaler;
+ Score = powf(Score, CacheDecayPower);
+ }
+ }
+
+ // Bonus points for having a low number of tris still to
+ // use the vert, so we get rid of lone verts quickly.
+ float ValenceBoost = powf(v->NumActiveTris,
+ -ValenceBoostPower);
+ Score += ValenceBoostScale * ValenceBoost;
+
+ return Score;
+}
+
+/*
+ A specialized LRU cache for the Forsyth algorithm.
+*/
+
+class f_lru
+{
+
+public:
+ f_lru(vcache *v, tcache *t): vc(v), tc(t)
+ {
+ for (u16 i = 0; i < cachesize; i++)
+ {
+ cache[i] = -1;
+ }
+ }
+
+ // Adds this vertex index and returns the highest-scoring triangle index
+ u32 add(u16 vert, bool updatetris = false)
+ {
+ bool found = false;
+
+ // Mark existing pos as empty
+ for (u16 i = 0; i < cachesize; i++)
+ {
+ if (cache[i] == vert)
+ {
+ // Move everything down
+ for (u16 j = i; j; j--)
+ {
+ cache[j] = cache[j - 1];
+ }
+
+ found = true;
+ break;
+ }
+ }
+
+ if (!found)
+ {
+ if (cache[cachesize-1] != -1)
+ vc[cache[cachesize-1]].cachepos = -1;
+
+ // Move everything down
+ for (u16 i = cachesize - 1; i; i--)
+ {
+ cache[i] = cache[i - 1];
+ }
+ }
+
+ cache[0] = vert;
+
+ u32 highest = 0;
+ float hiscore = 0;
+
+ if (updatetris)
+ {
+ // Update cache positions
+ for (u16 i = 0; i < cachesize; i++)
+ {
+ if (cache[i] == -1)
+ break;
+
+ vc[cache[i]].cachepos = i;
+ vc[cache[i]].score = FindVertexScore(&vc[cache[i]]);
+ }
+
+ // Update triangle scores
+ for (u16 i = 0; i < cachesize; i++)
+ {
+ if (cache[i] == -1)
+ break;
+
+ const u16 trisize = vc[cache[i]].tris.size();
+ for (u16 t = 0; t < trisize; t++)
+ {
+ tcache *tri = &tc[vc[cache[i]].tris[t]];
+
+ tri->score =
+ vc[tri->ind[0]].score +
+ vc[tri->ind[1]].score +
+ vc[tri->ind[2]].score;
+
+ if (tri->score > hiscore)
+ {
+ hiscore = tri->score;
+ highest = vc[cache[i]].tris[t];
+ }
+ }
+ }
+ }
+
+ return highest;
+ }
+
+private:
+ s32 cache[cachesize];
+ vcache *vc;
+ tcache *tc;
+};
+
+/**
+Vertex cache optimization according to the Forsyth paper:
+http://home.comcast.net/~tom_forsyth/papers/fast_vert_cache_opt.html
+
+The function is thread-safe (read: you can optimize several meshes in different threads)
+
+\param mesh Source mesh for the operation. */
+scene::IMesh* createForsythOptimizedMesh(const scene::IMesh *mesh)
+{
+ if (!mesh)
+ return 0;
+
+ scene::SMesh *newmesh = new scene::SMesh();
+ newmesh->BoundingBox = mesh->getBoundingBox();
+
+ const u32 mbcount = mesh->getMeshBufferCount();
+
+ for (u32 b = 0; b < mbcount; ++b)
+ {
+ const scene::IMeshBuffer *mb = mesh->getMeshBuffer(b);
+
+ if (mb->getIndexType() != video::EIT_16BIT)
+ {
+ //os::Printer::log("Cannot optimize a mesh with 32bit indices", ELL_ERROR);
+ newmesh->drop();
+ return 0;
+ }
+
+ const u32 icount = mb->getIndexCount();
+ const u32 tcount = icount / 3;
+ const u32 vcount = mb->getVertexCount();
+ const u16 *ind = mb->getIndices();
+
+ vcache *vc = new vcache[vcount];
+ tcache *tc = new tcache[tcount];
+
+ f_lru lru(vc, tc);
+
+ // init
+ for (u16 i = 0; i < vcount; i++)
+ {
+ vc[i].score = 0;
+ vc[i].cachepos = -1;
+ vc[i].NumActiveTris = 0;
+ }
+
+ // First pass: count how many times a vert is used
+ for (u32 i = 0; i < icount; i += 3)
+ {
+ vc[ind[i]].NumActiveTris++;
+ vc[ind[i + 1]].NumActiveTris++;
+ vc[ind[i + 2]].NumActiveTris++;
+
+ const u32 tri_ind = i/3;
+ tc[tri_ind].ind[0] = ind[i];
+ tc[tri_ind].ind[1] = ind[i + 1];
+ tc[tri_ind].ind[2] = ind[i + 2];
+ }
+
+ // Second pass: list of each triangle
+ for (u32 i = 0; i < tcount; i++)
+ {
+ vc[tc[i].ind[0]].tris.push_back(i);
+ vc[tc[i].ind[1]].tris.push_back(i);
+ vc[tc[i].ind[2]].tris.push_back(i);
+
+ tc[i].drawn = false;
+ }
+
+ // Give initial scores
+ for (u16 i = 0; i < vcount; i++)
+ {
+ vc[i].score = FindVertexScore(&vc[i]);
+ }
+ for (u32 i = 0; i < tcount; i++)
+ {
+ tc[i].score =
+ vc[tc[i].ind[0]].score +
+ vc[tc[i].ind[1]].score +
+ vc[tc[i].ind[2]].score;
+ }
+
+ switch(mb->getVertexType())
+ {
+ case video::EVT_STANDARD:
+ {
+ video::S3DVertex *v = (video::S3DVertex *) mb->getVertices();
+
+ scene::SMeshBuffer *buf = new scene::SMeshBuffer();
+ buf->Material = mb->getMaterial();
+
+ buf->Vertices.reallocate(vcount);
+ buf->Indices.reallocate(icount);
+
+ core::map<const video::S3DVertex, const u16> sind; // search index for fast operation
+ typedef core::map<const video::S3DVertex, const u16>::Node snode;
+
+ // Main algorithm
+ u32 highest = 0;
+ u32 drawcalls = 0;
+ for (;;)
+ {
+ if (tc[highest].drawn)
+ {
+ bool found = false;
+ float hiscore = 0;
+ for (u32 t = 0; t < tcount; t++)
+ {
+ if (!tc[t].drawn)
+ {
+ if (tc[t].score > hiscore)
+ {
+ highest = t;
+ hiscore = tc[t].score;
+ found = true;
+ }
+ }
+ }
+ if (!found)
+ break;
+ }
+
+ // Output the best triangle
+ u16 newind = buf->Vertices.size();
+
+ snode *s = sind.find(v[tc[highest].ind[0]]);
+
+ if (!s)
+ {
+ buf->Vertices.push_back(v[tc[highest].ind[0]]);
+ buf->Indices.push_back(newind);
+ sind.insert(v[tc[highest].ind[0]], newind);
+ newind++;
+ }
+ else
+ {
+ buf->Indices.push_back(s->getValue());
+ }
+
+ s = sind.find(v[tc[highest].ind[1]]);
+
+ if (!s)
+ {
+ buf->Vertices.push_back(v[tc[highest].ind[1]]);
+ buf->Indices.push_back(newind);
+ sind.insert(v[tc[highest].ind[1]], newind);
+ newind++;
+ }
+ else
+ {
+ buf->Indices.push_back(s->getValue());
+ }
+
+ s = sind.find(v[tc[highest].ind[2]]);
+
+ if (!s)
+ {
+ buf->Vertices.push_back(v[tc[highest].ind[2]]);
+ buf->Indices.push_back(newind);
+ sind.insert(v[tc[highest].ind[2]], newind);
+ }
+ else
+ {
+ buf->Indices.push_back(s->getValue());
+ }
+
+ vc[tc[highest].ind[0]].NumActiveTris--;
+ vc[tc[highest].ind[1]].NumActiveTris--;
+ vc[tc[highest].ind[2]].NumActiveTris--;
+
+ tc[highest].drawn = true;
+
+ for (u16 j = 0; j < 3; j++)
+ {
+ vcache *vert = &vc[tc[highest].ind[j]];
+ for (u16 t = 0; t < vert->tris.size(); t++)
+ {
+ if (highest == vert->tris[t])
+ {
+ vert->tris.erase(t);
+ break;
+ }
+ }
+ }
+
+ lru.add(tc[highest].ind[0]);
+ lru.add(tc[highest].ind[1]);
+ highest = lru.add(tc[highest].ind[2], true);
+ drawcalls++;
+ }
+
+ buf->setBoundingBox(mb->getBoundingBox());
+ newmesh->addMeshBuffer(buf);
+ buf->drop();
+ }
+ break;
+ case video::EVT_2TCOORDS:
+ {
+ video::S3DVertex2TCoords *v = (video::S3DVertex2TCoords *) mb->getVertices();
+
+ scene::SMeshBufferLightMap *buf = new scene::SMeshBufferLightMap();
+ buf->Material = mb->getMaterial();
+
+ buf->Vertices.reallocate(vcount);
+ buf->Indices.reallocate(icount);
+
+ core::map<const video::S3DVertex2TCoords, const u16> sind; // search index for fast operation
+ typedef core::map<const video::S3DVertex2TCoords, const u16>::Node snode;
+
+ // Main algorithm
+ u32 highest = 0;
+ u32 drawcalls = 0;
+ for (;;)
+ {
+ if (tc[highest].drawn)
+ {
+ bool found = false;
+ float hiscore = 0;
+ for (u32 t = 0; t < tcount; t++)
+ {
+ if (!tc[t].drawn)
+ {
+ if (tc[t].score > hiscore)
+ {
+ highest = t;
+ hiscore = tc[t].score;
+ found = true;
+ }
+ }
+ }
+ if (!found)
+ break;
+ }
+
+ // Output the best triangle
+ u16 newind = buf->Vertices.size();
+
+ snode *s = sind.find(v[tc[highest].ind[0]]);
+
+ if (!s)
+ {
+ buf->Vertices.push_back(v[tc[highest].ind[0]]);
+ buf->Indices.push_back(newind);
+ sind.insert(v[tc[highest].ind[0]], newind);
+ newind++;
+ }
+ else
+ {
+ buf->Indices.push_back(s->getValue());
+ }
+
+ s = sind.find(v[tc[highest].ind[1]]);
+
+ if (!s)
+ {
+ buf->Vertices.push_back(v[tc[highest].ind[1]]);
+ buf->Indices.push_back(newind);
+ sind.insert(v[tc[highest].ind[1]], newind);
+ newind++;
+ }
+ else
+ {
+ buf->Indices.push_back(s->getValue());
+ }
+
+ s = sind.find(v[tc[highest].ind[2]]);
+
+ if (!s)
+ {
+ buf->Vertices.push_back(v[tc[highest].ind[2]]);
+ buf->Indices.push_back(newind);
+ sind.insert(v[tc[highest].ind[2]], newind);
+ }
+ else
+ {
+ buf->Indices.push_back(s->getValue());
+ }
+
+ vc[tc[highest].ind[0]].NumActiveTris--;
+ vc[tc[highest].ind[1]].NumActiveTris--;
+ vc[tc[highest].ind[2]].NumActiveTris--;
+
+ tc[highest].drawn = true;
+
+ for (u16 j = 0; j < 3; j++)
+ {
+ vcache *vert = &vc[tc[highest].ind[j]];
+ for (u16 t = 0; t < vert->tris.size(); t++)
+ {
+ if (highest == vert->tris[t])
+ {
+ vert->tris.erase(t);
+ break;
+ }
+ }
+ }
+
+ lru.add(tc[highest].ind[0]);
+ lru.add(tc[highest].ind[1]);
+ highest = lru.add(tc[highest].ind[2]);
+ drawcalls++;
+ }
+
+ buf->setBoundingBox(mb->getBoundingBox());
+ newmesh->addMeshBuffer(buf);
+ buf->drop();
+
+ }
+ break;
+ case video::EVT_TANGENTS:
+ {
+ video::S3DVertexTangents *v = (video::S3DVertexTangents *) mb->getVertices();
+
+ scene::SMeshBufferTangents *buf = new scene::SMeshBufferTangents();
+ buf->Material = mb->getMaterial();
+
+ buf->Vertices.reallocate(vcount);
+ buf->Indices.reallocate(icount);
+
+ core::map<const video::S3DVertexTangents, const u16> sind; // search index for fast operation
+ typedef core::map<const video::S3DVertexTangents, const u16>::Node snode;
+
+ // Main algorithm
+ u32 highest = 0;
+ u32 drawcalls = 0;
+ for (;;)
+ {
+ if (tc[highest].drawn)
+ {
+ bool found = false;
+ float hiscore = 0;
+ for (u32 t = 0; t < tcount; t++)
+ {
+ if (!tc[t].drawn)
+ {
+ if (tc[t].score > hiscore)
+ {
+ highest = t;
+ hiscore = tc[t].score;
+ found = true;
+ }
+ }
+ }
+ if (!found)
+ break;
+ }
+
+ // Output the best triangle
+ u16 newind = buf->Vertices.size();
+
+ snode *s = sind.find(v[tc[highest].ind[0]]);
+
+ if (!s)
+ {
+ buf->Vertices.push_back(v[tc[highest].ind[0]]);
+ buf->Indices.push_back(newind);
+ sind.insert(v[tc[highest].ind[0]], newind);
+ newind++;
+ }
+ else
+ {
+ buf->Indices.push_back(s->getValue());
+ }
+
+ s = sind.find(v[tc[highest].ind[1]]);
+
+ if (!s)
+ {
+ buf->Vertices.push_back(v[tc[highest].ind[1]]);
+ buf->Indices.push_back(newind);
+ sind.insert(v[tc[highest].ind[1]], newind);
+ newind++;
+ }
+ else
+ {
+ buf->Indices.push_back(s->getValue());
+ }
+
+ s = sind.find(v[tc[highest].ind[2]]);
+
+ if (!s)
+ {
+ buf->Vertices.push_back(v[tc[highest].ind[2]]);
+ buf->Indices.push_back(newind);
+ sind.insert(v[tc[highest].ind[2]], newind);
+ }
+ else
+ {
+ buf->Indices.push_back(s->getValue());
+ }
+
+ vc[tc[highest].ind[0]].NumActiveTris--;
+ vc[tc[highest].ind[1]].NumActiveTris--;
+ vc[tc[highest].ind[2]].NumActiveTris--;
+
+ tc[highest].drawn = true;
+
+ for (u16 j = 0; j < 3; j++)
+ {
+ vcache *vert = &vc[tc[highest].ind[j]];
+ for (u16 t = 0; t < vert->tris.size(); t++)
+ {
+ if (highest == vert->tris[t])
+ {
+ vert->tris.erase(t);
+ break;
+ }
+ }
+ }
+
+ lru.add(tc[highest].ind[0]);
+ lru.add(tc[highest].ind[1]);
+ highest = lru.add(tc[highest].ind[2]);
+ drawcalls++;
+ }
+
+ buf->setBoundingBox(mb->getBoundingBox());
+ newmesh->addMeshBuffer(buf);
+ buf->drop();
+ }
+ break;
+ }
+
+ delete [] vc;
+ delete [] tc;
+
+ } // for each meshbuffer
+
+ return newmesh;
+}
diff --git a/src/mesh.h b/src/mesh.h
index 29f5ec76c..761842b0d 100644
--- a/src/mesh.h
+++ b/src/mesh.h
@@ -65,6 +65,13 @@ void setMeshColorByNormalXYZ(scene::IMesh *mesh,
void rotateMeshBy6dFacedir(scene::IMesh *mesh, int facedir);
/*
+ Rotate the mesh around the axis and given angle in degrees.
+*/
+void rotateMeshXYby (scene::IMesh *mesh, f64 degrees);
+void rotateMeshXZby (scene::IMesh *mesh, f64 degrees);
+void rotateMeshYZby (scene::IMesh *mesh, f64 degrees);
+
+/*
Clone the mesh.
*/
scene::IMesh* cloneMesh(scene::IMesh *src_mesh);
@@ -79,4 +86,11 @@ scene::IMesh* convertNodeboxNodeToMesh(ContentFeatures *f);
*/
void recalculateBoundingBox(scene::IMesh *src_mesh);
+/*
+ Vertex cache optimization according to the Forsyth paper:
+ http://home.comcast.net/~tom_forsyth/papers/fast_vert_cache_opt.html
+ Ported from irrlicht 1.8
+*/
+scene::IMesh* createForsythOptimizedMesh(const scene::IMesh *mesh);
+
#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-10 12:10:07 +0000