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minetest/src/mesh.cpp
paramat 25ba96fcac Meshes: Make object mesh face shading consistent 
Previously, object meshes had their North and South faces darker than
East and West faces, the opposite of nodes and meshnodes. This commit
corrects this.
State constants as float-literals not double-literals.
Simplify code.
Add comment.
2017-01-13 02:42:18 +00:00

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/*
Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
This program 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; either version 2.1 of the License, or
(at your option) any later version.
This program 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 program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "mesh.h"
#include "debug.h"
#include "log.h"
#include "irrMap.h"
#include <iostream>
#include <IAnimatedMesh.h>
#include <SAnimatedMesh.h>
// In Irrlicht 1.8 the signature of ITexture::lock was changed from
// (bool, u32) to (E_TEXTURE_LOCK_MODE, u32).
#if IRRLICHT_VERSION_MAJOR == 1 && IRRLICHT_VERSION_MINOR <= 7
#define MY_ETLM_READ_ONLY true
#else
#define MY_ETLM_READ_ONLY video::ETLM_READ_ONLY
#endif
static void applyFacesShading(video::SColor& color, float factor)
{
color.setRed(core::clamp(core::round32(color.getRed()*factor), 0, 255));
color.setGreen(core::clamp(core::round32(color.getGreen()*factor), 0, 255));
color.setBlue(core::clamp(core::round32(color.getBlue()*factor), 0, 255));
}
scene::IAnimatedMesh* createCubeMesh(v3f scale)
{
video::SColor c(255,255,255,255);
video::S3DVertex vertices[24] =
{
// Up
video::S3DVertex(-0.5,+0.5,-0.5, 0,1,0, c, 0,1),
video::S3DVertex(-0.5,+0.5,+0.5, 0,1,0, c, 0,0),
video::S3DVertex(+0.5,+0.5,+0.5, 0,1,0, c, 1,0),
video::S3DVertex(+0.5,+0.5,-0.5, 0,1,0, c, 1,1),
// Down
video::S3DVertex(-0.5,-0.5,-0.5, 0,-1,0, c, 0,0),
video::S3DVertex(+0.5,-0.5,-0.5, 0,-1,0, c, 1,0),
video::S3DVertex(+0.5,-0.5,+0.5, 0,-1,0, c, 1,1),
video::S3DVertex(-0.5,-0.5,+0.5, 0,-1,0, c, 0,1),
// Right
video::S3DVertex(+0.5,-0.5,-0.5, 1,0,0, c, 0,1),
video::S3DVertex(+0.5,+0.5,-0.5, 1,0,0, c, 0,0),
video::S3DVertex(+0.5,+0.5,+0.5, 1,0,0, c, 1,0),
video::S3DVertex(+0.5,-0.5,+0.5, 1,0,0, c, 1,1),
// Left
video::S3DVertex(-0.5,-0.5,-0.5, -1,0,0, c, 1,1),
video::S3DVertex(-0.5,-0.5,+0.5, -1,0,0, c, 0,1),
video::S3DVertex(-0.5,+0.5,+0.5, -1,0,0, c, 0,0),
video::S3DVertex(-0.5,+0.5,-0.5, -1,0,0, c, 1,0),
// Back
video::S3DVertex(-0.5,-0.5,+0.5, 0,0,1, c, 1,1),
video::S3DVertex(+0.5,-0.5,+0.5, 0,0,1, c, 0,1),
video::S3DVertex(+0.5,+0.5,+0.5, 0,0,1, c, 0,0),
video::S3DVertex(-0.5,+0.5,+0.5, 0,0,1, c, 1,0),
// Front
video::S3DVertex(-0.5,-0.5,-0.5, 0,0,-1, c, 0,1),
video::S3DVertex(-0.5,+0.5,-0.5, 0,0,-1, c, 0,0),
video::S3DVertex(+0.5,+0.5,-0.5, 0,0,-1, c, 1,0),
video::S3DVertex(+0.5,-0.5,-0.5, 0,0,-1, c, 1,1),
};
u16 indices[6] = {0,1,2,2,3,0};
scene::SMesh *mesh = new scene::SMesh();
for (u32 i=0; i<6; ++i)
{
scene::IMeshBuffer *buf = new scene::SMeshBuffer();
buf->append(vertices + 4 * i, 4, indices, 6);
// Set default material
buf->getMaterial().setFlag(video::EMF_LIGHTING, false);
buf->getMaterial().setFlag(video::EMF_BILINEAR_FILTER, false);
buf->getMaterial().MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF;
// Add mesh buffer to mesh
mesh->addMeshBuffer(buf);
buf->drop();
}
scene::SAnimatedMesh *anim_mesh = new scene::SAnimatedMesh(mesh);
mesh->drop();
scaleMesh(anim_mesh, scale); // also recalculates bounding box
return anim_mesh;
}
void scaleMesh(scene::IMesh *mesh, v3f scale)
{
if (mesh == NULL)
return;
aabb3f bbox;
bbox.reset(0, 0, 0);
u32 mc = mesh->getMeshBufferCount();
for (u32 j = 0; j < mc; j++) {
scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
const u32 stride = getVertexPitchFromType(buf->getVertexType());
u32 vertex_count = buf->getVertexCount();
u8 *vertices = (u8 *)buf->getVertices();
for (u32 i = 0; i < vertex_count; i++)
((video::S3DVertex *)(vertices + i * stride))->Pos *= scale;
buf->recalculateBoundingBox();
// calculate total bounding box
if (j == 0)
bbox = buf->getBoundingBox();
else
bbox.addInternalBox(buf->getBoundingBox());
}
mesh->setBoundingBox(bbox);
}
void translateMesh(scene::IMesh *mesh, v3f vec)
{
if (mesh == NULL)
return;
aabb3f bbox;
bbox.reset(0, 0, 0);
u32 mc = mesh->getMeshBufferCount();
for (u32 j = 0; j < mc; j++) {
scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
const u32 stride = getVertexPitchFromType(buf->getVertexType());
u32 vertex_count = buf->getVertexCount();
u8 *vertices = (u8 *)buf->getVertices();
for (u32 i = 0; i < vertex_count; i++)
((video::S3DVertex *)(vertices + i * stride))->Pos += vec;
buf->recalculateBoundingBox();
// calculate total bounding box
if (j == 0)
bbox = buf->getBoundingBox();
else
bbox.addInternalBox(buf->getBoundingBox());
}
mesh->setBoundingBox(bbox);
}
void setMeshColor(scene::IMesh *mesh, const video::SColor &color)
{
if (mesh == NULL)
return;
u32 mc = mesh->getMeshBufferCount();
for (u32 j = 0; j < mc; j++) {
scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
const u32 stride = getVertexPitchFromType(buf->getVertexType());
u32 vertex_count = buf->getVertexCount();
u8 *vertices = (u8 *)buf->getVertices();
for (u32 i = 0; i < vertex_count; i++)
((video::S3DVertex *)(vertices + i * stride))->Color = color;
}
}
void shadeMeshFaces(scene::IMesh *mesh)
{
if (mesh == NULL)
return;
u32 mc = mesh->getMeshBufferCount();
for (u32 j = 0; j < mc; j++) {
scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
const u32 stride = getVertexPitchFromType(buf->getVertexType());
u32 vertex_count = buf->getVertexCount();
u8 *vertices = (u8 *)buf->getVertices();
for (u32 i = 0; i < vertex_count; i++) {
video::S3DVertex *vertex = (video::S3DVertex *)(vertices + i * stride);
video::SColor &vc = vertex->Color;
// Many special drawtypes have normals set to 0,0,0 and this
// must result in maximum brightness (no face shadng).
if (vertex->Normal.Y < -0.5f)
applyFacesShading (vc, 0.447213f);
else if (vertex->Normal.X > 0.5f || vertex->Normal.X < -0.5f)
applyFacesShading (vc, 0.670820f);
else if (vertex->Normal.Z > 0.5f || vertex->Normal.Z < -0.5f)
applyFacesShading (vc, 0.836660f);
}
}
}
void setMeshColorByNormalXYZ(scene::IMesh *mesh,
const video::SColor &colorX,
const video::SColor &colorY,
const video::SColor &colorZ)
{
if (mesh == NULL)
return;
u16 mc = mesh->getMeshBufferCount();
for (u16 j = 0; j < mc; j++) {
scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
const u32 stride = getVertexPitchFromType(buf->getVertexType());
u32 vertex_count = buf->getVertexCount();
u8 *vertices = (u8 *)buf->getVertices();
for (u32 i = 0; i < vertex_count; i++) {
video::S3DVertex *vertex = (video::S3DVertex *)(vertices + i * stride);
f32 x = fabs(vertex->Normal.X);
f32 y = fabs(vertex->Normal.Y);
f32 z = fabs(vertex->Normal.Z);
if (x >= y && x >= z)
vertex->Color = colorX;
else if (y >= z)
vertex->Color = colorY;
else
vertex->Color = colorZ;
}
}
}
void setMeshColorByNormal(scene::IMesh *mesh, const v3f &normal,
const video::SColor &color)
{
if (!mesh)
return;
u16 mc = mesh->getMeshBufferCount();
for (u16 j = 0; j < mc; j++) {
scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
const u32 stride = getVertexPitchFromType(buf->getVertexType());
u32 vertex_count = buf->getVertexCount();
u8 *vertices = (u8 *)buf->getVertices();
for (u32 i = 0; i < vertex_count; i++) {
video::S3DVertex *vertex = (video::S3DVertex *)(vertices + i * stride);
if (normal == vertex->Normal) {
vertex->Color = color;
}
}
}
}
void rotateMeshXYby(scene::IMesh *mesh, f64 degrees)
{
u16 mc = mesh->getMeshBufferCount();
for (u16 j = 0; j < mc; j++) {
scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
const u32 stride = getVertexPitchFromType(buf->getVertexType());
u32 vertex_count = buf->getVertexCount();
u8 *vertices = (u8 *)buf->getVertices();
for (u32 i = 0; i < vertex_count; i++)
((video::S3DVertex *)(vertices + i * stride))->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);
const u32 stride = getVertexPitchFromType(buf->getVertexType());
u32 vertex_count = buf->getVertexCount();
u8 *vertices = (u8 *)buf->getVertices();
for (u32 i = 0; i < vertex_count; i++)
((video::S3DVertex *)(vertices + i * stride))->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);
const u32 stride = getVertexPitchFromType(buf->getVertexType());
u32 vertex_count = buf->getVertexCount();
u8 *vertices = (u8 *)buf->getVertices();
for (u32 i = 0; i < vertex_count; i++)
((video::S3DVertex *)(vertices + i * stride))->Pos.rotateYZBy(degrees);
}
}
void rotateMeshBy6dFacedir(scene::IMesh *mesh, int facedir)
{
int axisdir = facedir >> 2;
facedir &= 0x03;
u16 mc = mesh->getMeshBufferCount();
for (u16 j = 0; j < mc; j++) {
scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
const u32 stride = getVertexPitchFromType(buf->getVertexType());
u32 vertex_count = buf->getVertexCount();
u8 *vertices = (u8 *)buf->getVertices();
for (u32 i = 0; i < vertex_count; i++) {
video::S3DVertex *vertex = (video::S3DVertex *)(vertices + i * stride);
switch (axisdir) {
case 0:
if (facedir == 1)
vertex->Pos.rotateXZBy(-90);
else if (facedir == 2)
vertex->Pos.rotateXZBy(180);
else if (facedir == 3)
vertex->Pos.rotateXZBy(90);
break;
case 1: // z+
vertex->Pos.rotateYZBy(90);
if (facedir == 1)
vertex->Pos.rotateXYBy(90);
else if (facedir == 2)
vertex->Pos.rotateXYBy(180);
else if (facedir == 3)
vertex->Pos.rotateXYBy(-90);
break;
case 2: //z-
vertex->Pos.rotateYZBy(-90);
if (facedir == 1)
vertex->Pos.rotateXYBy(-90);
else if (facedir == 2)
vertex->Pos.rotateXYBy(180);
else if (facedir == 3)
vertex->Pos.rotateXYBy(90);
break;
case 3: //x+
vertex->Pos.rotateXYBy(-90);
if (facedir == 1)
vertex->Pos.rotateYZBy(90);
else if (facedir == 2)
vertex->Pos.rotateYZBy(180);
else if (facedir == 3)
vertex->Pos.rotateYZBy(-90);
break;
case 4: //x-
vertex->Pos.rotateXYBy(90);
if (facedir == 1)
vertex->Pos.rotateYZBy(-90);
else if (facedir == 2)
vertex->Pos.rotateYZBy(180);
else if (facedir == 3)
vertex->Pos.rotateYZBy(90);
break;
case 5:
vertex->Pos.rotateXYBy(-180);
if (facedir == 1)
vertex->Pos.rotateXZBy(90);
else if (facedir == 2)
vertex->Pos.rotateXZBy(180);
else if (facedir == 3)
vertex->Pos.rotateXZBy(-90);
break;
default:
break;
}
}
}
}
void recalculateBoundingBox(scene::IMesh *src_mesh)
{
aabb3f bbox;
bbox.reset(0,0,0);
for (u16 j = 0; j < src_mesh->getMeshBufferCount(); j++) {
scene::IMeshBuffer *buf = src_mesh->getMeshBuffer(j);
buf->recalculateBoundingBox();
if (j == 0)
bbox = buf->getBoundingBox();
else
bbox.addInternalBox(buf->getBoundingBox());
}
src_mesh->setBoundingBox(bbox);
}
scene::IMesh* cloneMesh(scene::IMesh *src_mesh)
{
scene::SMesh* dst_mesh = new scene::SMesh();
for (u16 j = 0; j < src_mesh->getMeshBufferCount(); j++) {
scene::IMeshBuffer *buf = src_mesh->getMeshBuffer(j);
switch (buf->getVertexType()) {
case video::EVT_STANDARD: {
video::S3DVertex *v =
(video::S3DVertex *) buf->getVertices();
u16 *indices = (u16*)buf->getIndices();
scene::SMeshBuffer *temp_buf = new scene::SMeshBuffer();
temp_buf->append(v, buf->getVertexCount(),
indices, buf->getIndexCount());
dst_mesh->addMeshBuffer(temp_buf);
temp_buf->drop();
break;
}
case video::EVT_2TCOORDS: {
video::S3DVertex2TCoords *v =
(video::S3DVertex2TCoords *) buf->getVertices();
u16 *indices = (u16*)buf->getIndices();
scene::SMeshBufferTangents *temp_buf =
new scene::SMeshBufferTangents();
temp_buf->append(v, buf->getVertexCount(),
indices, buf->getIndexCount());
dst_mesh->addMeshBuffer(temp_buf);
temp_buf->drop();
break;
}
case video::EVT_TANGENTS: {
video::S3DVertexTangents *v =
(video::S3DVertexTangents *) buf->getVertices();
u16 *indices = (u16*)buf->getIndices();
scene::SMeshBufferTangents *temp_buf =
new scene::SMeshBufferTangents();
temp_buf->append(v, buf->getVertexCount(),
indices, buf->getIndexCount());
dst_mesh->addMeshBuffer(temp_buf);
temp_buf->drop();
break;
}
}
}
return dst_mesh;
}
scene::IMesh* convertNodeboxesToMesh(const std::vector<aabb3f> &boxes,
const f32 *uv_coords, float expand)
{
scene::SMesh* dst_mesh = new scene::SMesh();
for (u16 j = 0; j < 6; j++)
{
scene::IMeshBuffer *buf = new scene::SMeshBuffer();
buf->getMaterial().setFlag(video::EMF_LIGHTING, false);
buf->getMaterial().setFlag(video::EMF_BILINEAR_FILTER, false);
dst_mesh->addMeshBuffer(buf);
buf->drop();
}
video::SColor c(255,255,255,255);
for (std::vector<aabb3f>::const_iterator
i = boxes.begin();
i != boxes.end(); ++i)
{
aabb3f box = *i;
box.repair();
box.MinEdge.X -= expand;
box.MinEdge.Y -= expand;
box.MinEdge.Z -= expand;
box.MaxEdge.X += expand;
box.MaxEdge.Y += expand;
box.MaxEdge.Z += expand;
// Compute texture UV coords
f32 tx1 = (box.MinEdge.X / BS) + 0.5;
f32 ty1 = (box.MinEdge.Y / BS) + 0.5;
f32 tz1 = (box.MinEdge.Z / BS) + 0.5;
f32 tx2 = (box.MaxEdge.X / BS) + 0.5;
f32 ty2 = (box.MaxEdge.Y / BS) + 0.5;
f32 tz2 = (box.MaxEdge.Z / BS) + 0.5;
f32 txc_default[24] = {
// up
tx1, 1 - tz2, tx2, 1 - tz1,
// down
tx1, tz1, tx2, tz2,
// right
tz1, 1 - ty2, tz2, 1 - ty1,
// left
1 - tz2, 1 - ty2, 1 - tz1, 1 - ty1,
// back
1 - tx2, 1 - ty2, 1 - tx1, 1 - ty1,
// front
tx1, 1 - ty2, tx2, 1 - ty1,
};
// use default texture UV mapping if not provided
const f32 *txc = uv_coords ? uv_coords : txc_default;
v3f min = box.MinEdge;
v3f max = box.MaxEdge;
video::S3DVertex vertices[24] =
{
// up
video::S3DVertex(min.X,max.Y,max.Z, 0,1,0, c, txc[0],txc[1]),
video::S3DVertex(max.X,max.Y,max.Z, 0,1,0, c, txc[2],txc[1]),
video::S3DVertex(max.X,max.Y,min.Z, 0,1,0, c, txc[2],txc[3]),
video::S3DVertex(min.X,max.Y,min.Z, 0,1,0, c, txc[0],txc[3]),
// down
video::S3DVertex(min.X,min.Y,min.Z, 0,-1,0, c, txc[4],txc[5]),
video::S3DVertex(max.X,min.Y,min.Z, 0,-1,0, c, txc[6],txc[5]),
video::S3DVertex(max.X,min.Y,max.Z, 0,-1,0, c, txc[6],txc[7]),
video::S3DVertex(min.X,min.Y,max.Z, 0,-1,0, c, txc[4],txc[7]),
// right
video::S3DVertex(max.X,max.Y,min.Z, 1,0,0, c, txc[ 8],txc[9]),
video::S3DVertex(max.X,max.Y,max.Z, 1,0,0, c, txc[10],txc[9]),
video::S3DVertex(max.X,min.Y,max.Z, 1,0,0, c, txc[10],txc[11]),
video::S3DVertex(max.X,min.Y,min.Z, 1,0,0, c, txc[ 8],txc[11]),
// left
video::S3DVertex(min.X,max.Y,max.Z, -1,0,0, c, txc[12],txc[13]),
video::S3DVertex(min.X,max.Y,min.Z, -1,0,0, c, txc[14],txc[13]),
video::S3DVertex(min.X,min.Y,min.Z, -1,0,0, c, txc[14],txc[15]),
video::S3DVertex(min.X,min.Y,max.Z, -1,0,0, c, txc[12],txc[15]),
// back
video::S3DVertex(max.X,max.Y,max.Z, 0,0,1, c, txc[16],txc[17]),
video::S3DVertex(min.X,max.Y,max.Z, 0,0,1, c, txc[18],txc[17]),
video::S3DVertex(min.X,min.Y,max.Z, 0,0,1, c, txc[18],txc[19]),
video::S3DVertex(max.X,min.Y,max.Z, 0,0,1, c, txc[16],txc[19]),
// front
video::S3DVertex(min.X,max.Y,min.Z, 0,0,-1, c, txc[20],txc[21]),
video::S3DVertex(max.X,max.Y,min.Z, 0,0,-1, c, txc[22],txc[21]),
video::S3DVertex(max.X,min.Y,min.Z, 0,0,-1, c, txc[22],txc[23]),
video::S3DVertex(min.X,min.Y,min.Z, 0,0,-1, c, txc[20],txc[23]),
};
u16 indices[] = {0,1,2,2,3,0};
for(u16 j = 0; j < 24; j += 4)
{
scene::IMeshBuffer *buf = dst_mesh->getMeshBuffer(j / 4);
buf->append(vertices + j, 4, indices, 6);
}
}
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;
}
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