void setupScene_MultiDrawElements()
{
ref<Geometry> torus1 = vl::makeTorus( vec3(-10, -9, 0), 8.0f, 1.0f, 20, 20 );
ref<Geometry> torus2 = vl::makeTorus( vec3( 0, -9, 0), 8.0f, 2.0f, 10, 10 );
ref<Geometry> torus3 = vl::makeTorus( vec3(+10, -9, 0), 8.0f, 3.0f, 7, 7 );
// merge vertices
ref<ArrayFloat3> vert = new ArrayFloat3;
ref<ArrayFloat3> torus1_vert = vl::cast<ArrayFloat3>(torus1->vertexArray());
ref<ArrayFloat3> torus2_vert = vl::cast<ArrayFloat3>(torus2->vertexArray());
ref<ArrayFloat3> torus3_vert = vl::cast<ArrayFloat3>(torus3->vertexArray());
vert->resize( torus1_vert->size() + torus2_vert->size() + torus3_vert->size() );
memcpy( vert->ptr(), torus1_vert->ptr(), torus1_vert->bytesUsed() );
memcpy( vert->ptr() + torus1_vert->bytesUsed(), torus2_vert->ptr(), torus2_vert->bytesUsed() );
memcpy( vert->ptr() + torus1_vert->bytesUsed() + torus2_vert->bytesUsed(), torus3_vert->ptr(), torus3_vert->bytesUsed() );
// merge indices
ref<MultiDrawElementsUInt> mde = new MultiDrawElementsUInt(PT_QUADS);
ref<DrawCall> torus1_dc = torus1->drawCalls()->at(0);
ref<DrawCall> torus2_dc = torus2->drawCalls()->at(0);
ref<DrawCall> torus3_dc = torus3->drawCalls()->at(0);
int torus1_index_count = (int)torus1_dc->countIndices();
int torus2_index_count = (int)torus2_dc->countIndices();
int torus3_index_count = (int)torus3_dc->countIndices();
mde->indexBuffer()->resize( torus1_index_count + torus2_index_count + torus3_index_count );
MultiDrawElementsUInt::index_type* p_idx = mde->indexBuffer()->begin();
for( IndexIterator it = torus1_dc->indexIterator(); it.hasNext(); it.next(), ++p_idx )
*p_idx = it.index();
for( IndexIterator it = torus2_dc->indexIterator(); it.hasNext(); it.next(), ++p_idx )
*p_idx = it.index() + (int)torus1_vert->size();
for( IndexIterator it = torus3_dc->indexIterator(); it.hasNext(); it.next(), ++p_idx )
*p_idx = it.index() + (int)torus1_vert->size() + (int)torus2_vert->size();
VL_CHECK(p_idx == mde->indexBuffer()->end());
// define how many indices for each draw call
GLsizei count_vector[] = { torus1_index_count, torus2_index_count, torus3_index_count };
mde->setCountVector( count_vector, 3 );
ref<Geometry> geom = new Geometry;
geom->setVertexArray( vert.get() );
geom->drawCalls()->push_back( mde.get() );
// compute normals must be done after the draw calls have been added.
geom->computeNormals();
ref<Effect> fx = new Effect;
fx->shader()->setRenderState( new Light, 0 );
fx->shader()->enable(vl::EN_LIGHTING);
fx->shader()->enable(vl::EN_DEPTH_TEST);
fx->shader()->gocMaterial()->setDiffuse( vl::pink );
sceneManager()->tree()->addActor( geom.get(), fx.get(), NULL );
}
//-----------------------------------------------------------------------------
void DoubleVertexRemover::removeDoubles(Geometry* geom)
{
mMapNewToOld.clear();
mMapOldToNew.clear();
std::vector<unsigned int> verti;
verti.resize(geom->vertexArray()->size());
mMapOldToNew.resize(verti.size());
for(unsigned int i=0; i<verti.size(); ++i)
{
verti[i] = i;
mMapOldToNew[i] = 0xFFFFFFFF;
}
mMapNewToOld.reserve(verti.size());
std::sort(verti.begin(), verti.end(), CompareVertex(geom));
if (verti.empty())
return;
unsigned int unique_vert_idx = 0;
for(unsigned i=1; i<verti.size(); ++i)
{
if ( !CompareVertex(geom).equals(verti[unique_vert_idx],verti[i]) )
{
for(unsigned j=unique_vert_idx; j<i; ++j)
mMapOldToNew[verti[j]] = mMapNewToOld.size();
mMapNewToOld.push_back(verti[unique_vert_idx]);
unique_vert_idx = i;
}
}
for(unsigned j=unique_vert_idx; j<verti.size(); ++j)
{
mMapOldToNew[verti[j]] = mMapNewToOld.size();
mMapNewToOld.push_back(verti[unique_vert_idx]);
}
// regenerate vertices
geom->regenerateVertices(mMapNewToOld);
// regenerate DrawCall
std::vector< ref<DrawCall> > draw_cmd;
for(int idraw=0; idraw<geom->drawCalls()->size(); ++idraw)
draw_cmd.push_back( geom->drawCalls()->at(idraw) );
geom->drawCalls()->clear();
for(size_t idraw=0; idraw<draw_cmd.size(); ++idraw)
{
ref<DrawElementsUInt> tris = new DrawElementsUInt( draw_cmd[idraw]->primitiveType() );
geom->drawCalls()->push_back(tris.get());
const int idx_count = draw_cmd[idraw]->countIndices();
tris->indices()->resize(idx_count);
int i=0;
for(IndexIterator it = draw_cmd[idraw]->indexIterator(); !it.isEnd(); it.next(), ++i)
tris->indices()->at(i) = mMapOldToNew[it.index()];
}
#if 0
printf("DoubleVertexRemover = %d/%d, saved = %d, shrink=%.2f\n", (int)mMapNewToOld.size(), (int)verti.size(), (int)verti.size()-(int)mMapNewToOld.size(), (float)mMapNewToOld.size()/verti.size() );
#endif
}