source/mesh.cpp

   1 #include <msp/gl/extensions/arb_vertex_array_object.h>
   2 #include <msp/gl/extensions/arb_vertex_buffer_object.h>
   3 #include <msp/gl/extensions/arb_vertex_shader.h>
   4 #include "buffer.h"
   5 #include "error.h"
   6 #include "mesh.h"
   7 #include "renderer.h"
   8 #include "resourcemanager.h"
   9 #include "vertexsetup.h"
  10
  11 using namespace std;
  12
  13 namespace Msp {
  14 namespace GL {
  15
  16 Mesh::Mesh(ResourceManager *rm):
  17         vertices(VERTEX3)
  18 {
  19         init(rm);
  20 }
  21
  22 Mesh::Mesh(const VertexFormat &f, ResourceManager *rm):
  23         vertices(f)
  24 {
  25         init(rm);
  26 }
  27
  28 void Mesh::init(ResourceManager *rm)
  29 {
  30         vbuf = 0;
  31         ibuf = 0;
  32         disallow_rendering = false;
  33         winding = 0;
  34
  35         if(rm)
  36                 set_manager(rm);
  37 }
  38
  39 Mesh::~Mesh()
  40 {
  41         set_manager(0);
  42         delete vbuf;
  43         delete ibuf;
  44 }
  45
  46 void Mesh::clear()
  47 {
  48         vertices.clear();
  49         batches.clear();
  50 }
  51
  52 void Mesh::create_buffers()
  53 {
  54         if(vbuf && ibuf)
  55                 return;
  56
  57         if(!vbuf)
  58                 vbuf = new Buffer(ARRAY_BUFFER);
  59         vertices.use_buffer(vbuf);
  60
  61         if(!ibuf)
  62                 ibuf = new Buffer(ELEMENT_ARRAY_BUFFER);
  63
  64         vtx_setup.set_vertex_array(vertices);
  65         vtx_setup.set_index_buffer(*ibuf);
  66 }
  67
  68 unsigned Mesh::get_n_vertices() const
  69 {
  70         return vertices.size();
  71 }
  72
  73 float *Mesh::modify_vertex(unsigned i)
  74 {
  75         return vertices.modify(i);
  76 }
  77
  78 void Mesh::add_batch(const Batch &b)
  79 {
  80         create_buffers();
  81
  82         if(!batches.empty() && batches.back().can_append(b.get_type()))
  83                 batches.back().append(b);
  84         else
  85         {
  86                 bool reallocate = (batches.size()==batches.capacity());
  87                 if(reallocate && ibuf)
  88                 {
  89                         for(vector<Batch>::iterator i=batches.end(); i!=batches.begin(); )
  90                                 (--i)->use_buffer(0);
  91                 }
  92
  93                 Batch *prev = (batches.empty() ? 0 : &batches.back());
  94                 batches.push_back(b);
  95                 if(ibuf)
  96                 {
  97                         if(reallocate)
  98                         {
  99                                 prev = 0;
 100                                 for(vector<Batch>::iterator i=batches.begin(); i!=batches.end(); ++i)
 101                                 {
 102                                         i->use_buffer(ibuf, prev);
 103                                         prev = &*i;
 104                                 }
 105                         }
 106                         else
 107                                 batches.back().use_buffer(ibuf, prev);
 108                 }
 109         }
 110 }
 111
 112 void Mesh::set_winding(const WindingTest *w)
 113 {
 114         winding = w;
 115 }
 116
 117 void Mesh::draw(Renderer &renderer) const
 118 {
 119         if(manager)
 120         {
 121                 manager->resource_used(*this);
 122                 if(disallow_rendering)
 123                         return;
 124         }
 125
 126         renderer.set_vertex_setup(&vtx_setup);
 127         renderer.set_winding_test(winding);
 128
 129         for(vector<Batch>::const_iterator i=batches.begin(); i!=batches.end(); ++i)
 130                 renderer.draw(*i);
 131 }
 132
 133 void Mesh::draw_instanced(Renderer &renderer, const VertexSetup &vs, unsigned count) const
 134 {
 135         if(vs.get_vertex_array()!=&vertices)
 136                 throw invalid_argument("Mesh::draw_instanced");
 137
 138         if(manager)
 139         {
 140                 manager->resource_used(*this);
 141                 if(disallow_rendering)
 142                         return;
 143         }
 144
 145         renderer.set_vertex_setup(&vs);
 146         renderer.set_winding_test(winding);
 147
 148         for(vector<Batch>::const_iterator i=batches.begin(); i!=batches.end(); ++i)
 149                 renderer.draw_instanced(*i, count);
 150 }
 151
 152 Resource::AsyncLoader *Mesh::load(IO::Seekable &io, const Resources *)
 153 {
 154         return new AsyncLoader(*this, io);
 155 }
 156
 157 UInt64 Mesh::get_data_size() const
 158 {
 159         UInt64 size = 0;
 160         if(vbuf)
 161                 size += vbuf->get_size();
 162         if(ibuf)
 163                 size += ibuf->get_size();
 164         return size;
 165 }
 166
 167 void Mesh::unload()
 168 {
 169         vertices.clear();
 170         vertices.use_buffer(0);
 171         batches.clear();
 172         delete vbuf;
 173         delete ibuf;
 174         vbuf = 0;
 175         ibuf = 0;
 176 }
 177
 178
 179 Mesh::Loader::Loader(Mesh &m):
 180         DataFile::ObjectLoader<Mesh>(m)
 181 {
 182         add("batch",    &Loader::batch);
 183         add("vertices", &Loader::vertices);
 184         add("winding",  &Loader::winding);
 185 }
 186
 187 void Mesh::Loader::vertices(const vector<VertexComponent> &c)
 188 {
 189         if(c.empty())
 190                 throw invalid_argument("No vertex components");
 191
 192         VertexFormat fmt;
 193         for(vector<VertexComponent>::const_iterator i=c.begin(); i!=c.end(); ++i)
 194                 fmt = (fmt, *i);
 195         obj.vertices.reset(fmt);
 196         if(obj.vbuf)
 197                 // Set it again to force the vertex setup to update
 198                 obj.vtx_setup.set_vertex_array(obj.vertices);
 199         load_sub(obj.vertices);
 200 }
 201
 202 void Mesh::Loader::batch(PrimitiveType p)
 203 {
 204         Batch btc(p);
 205         load_sub(btc);
 206         obj.add_batch(btc);
 207 }
 208
 209 void Mesh::Loader::winding(FaceWinding w)
 210 {
 211         if(w==CLOCKWISE)
 212                 obj.winding = &WindingTest::clockwise();
 213         else if(w==COUNTERCLOCKWISE)
 214                 obj.winding = &WindingTest::counterclockwise();
 215 }
 216
 217
 218 Mesh::AsyncLoader::AsyncLoader(Mesh &m, IO::Seekable &i):
 219         mesh(m),
 220         io(i),
 221         vertex_updater(0),
 222         index_updater(0),
 223         phase(0)
 224 {
 225         mesh.disallow_rendering = true;
 226         mesh.create_buffers();
 227 }
 228
 229 Mesh::AsyncLoader::~AsyncLoader()
 230 {
 231         mesh.disallow_rendering = false;
 232         delete vertex_updater;
 233         delete index_updater;
 234 }
 235
 236 bool Mesh::AsyncLoader::needs_sync() const
 237 {
 238         return phase%2;
 239 }
 240
 241 bool Mesh::AsyncLoader::process()
 242 {
 243         if(phase==0)
 244         {
 245                 // TODO use correct filename
 246                 DataFile::Parser parser(io, "async");
 247                 Loader loader(mesh);
 248                 loader.load(parser);
 249         }
 250         else if(phase==1)
 251         {
 252                 vertex_updater = mesh.vertices.refresh_async();
 253                 if(!mesh.batches.empty())
 254                         index_updater = mesh.batches.front().refresh_async();
 255         }
 256         else if(phase==2)
 257         {
 258                 if(vertex_updater)
 259                         vertex_updater->upload_data();
 260                 if(index_updater)
 261                         index_updater->upload_data();
 262         }
 263         else if(phase==3)
 264         {
 265                 delete vertex_updater;
 266                 vertex_updater = 0;
 267                 delete index_updater;
 268                 index_updater = 0;
 269         }
 270
 271         ++phase;
 272         if(phase==1 && !mesh.vbuf && !mesh.ibuf)
 273                 phase += 3;
 274         return phase>3;
 275 }
 276
 277 } // namespace GL
 278 } // namespace Msp