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 <msp/gl/extensions/nv_primitive_restart.h>
   5 #include "buffer.h"
   6 #include "error.h"
   7 #include "mesh.h"
   8 #include "renderer.h"
   9 #include "resourcemanager.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         vao_id = 0;
  33         defer_buffers = ARB_vertex_buffer_object;
  34         dirty = true;
  35         disallow_rendering = false;
  36         winding = 0;
  37
  38         if(rm)
  39                 set_manager(rm);
  40 }
  41
  42 Mesh::~Mesh()
  43 {
  44         set_manager(0);
  45         delete vbuf;
  46         delete ibuf;
  47         if(vao_id)
  48                 glDeleteVertexArrays(1, &vao_id);
  49 }
  50
  51 void Mesh::clear()
  52 {
  53         vertices.clear();
  54         batches.clear();
  55 }
  56
  57 void Mesh::use_buffers(bool b)
  58 {
  59         defer_buffers = false;
  60         if(b)
  61                 create_buffers();
  62         else
  63         {
  64                 vertices.use_buffer(0);
  65                 delete vbuf;
  66                 vbuf = 0;
  67                 delete ibuf;
  68                 ibuf = 0;
  69         }
  70 }
  71
  72 void Mesh::create_buffers()
  73 {
  74         defer_buffers = false;
  75
  76         if(!vbuf)
  77                 vbuf = new Buffer(ARRAY_BUFFER);
  78         vertices.use_buffer(vbuf);
  79
  80         if(!ibuf)
  81                 ibuf = new Buffer(ELEMENT_ARRAY_BUFFER);
  82
  83         if(ARB_vertex_array_object && !vao_id)
  84                 glGenVertexArrays(1, &vao_id);
  85 }
  86
  87 void Mesh::setup_vao() const
  88 {
  89         Bind bind_vbuf(vbuf, ARRAY_BUFFER);
  90
  91         const VertexFormat &fmt = vertices.get_format();
  92         unsigned stride = get_stride(fmt)*sizeof(float);
  93         float *ptr = 0;
  94         for(const unsigned char *c=fmt.begin(); c!=fmt.end(); ++c)
  95         {
  96                 unsigned t = get_component_type(*c);
  97                 if(t>=get_component_type(ATTRIB1))
  98                         t -= get_component_type(ATTRIB1);
  99                 unsigned sz = get_component_size(*c);
 100                 if(*c==COLOR4_UBYTE)
 101                         glVertexAttribPointer(t, 4, GL_UNSIGNED_BYTE, true, stride, ptr);
 102                 else
 103                         glVertexAttribPointer(t, sz, GL_FLOAT, false, stride, ptr);
 104                 glEnableVertexAttribArray(t);
 105                 ptr += sz;
 106         }
 107         glBindBuffer(ELEMENT_ARRAY_BUFFER, ibuf->get_id());
 108
 109         dirty = false;
 110 }
 111
 112 unsigned Mesh::get_n_vertices() const
 113 {
 114         return vertices.size();
 115 }
 116
 117 float *Mesh::modify_vertex(unsigned i)
 118 {
 119         return vertices.modify(i);
 120 }
 121
 122 void Mesh::add_batch(const Batch &b)
 123 {
 124         if(defer_buffers)
 125                 create_buffers();
 126
 127         if(!batches.empty() && batches.back().can_append(b.get_type()))
 128                 batches.back().append(b);
 129         else
 130         {
 131                 Batch *prev = (batches.empty() ? 0 : &batches.back());
 132                 batches.push_back(b);
 133                 if(ibuf)
 134                         batches.back().use_buffer(ibuf, prev);
 135         }
 136 }
 137
 138 void Mesh::set_winding(const WindingTest *w)
 139 {
 140         winding = w;
 141 }
 142
 143 void Mesh::draw() const
 144 {
 145         const Mesh *cur = current();
 146         if(cur && cur!=this)
 147                 throw invalid_operation("Mesh::draw");
 148
 149         if(manager)
 150         {
 151                 manager->resource_used(*this);
 152                 if(disallow_rendering)
 153                         return;
 154         }
 155
 156         if(!current())
 157                 vertices.apply();
 158         BindRestore bind_ibuf(ibuf, ELEMENT_ARRAY_BUFFER);
 159         Bind bind_winding(winding);
 160
 161         for(list<Batch>::const_iterator i=batches.begin(); i!=batches.end(); ++i)
 162                 i->draw();
 163 }
 164
 165 void Mesh::draw(Renderer &renderer) const
 166 {
 167         if(manager)
 168         {
 169                 manager->resource_used(*this);
 170                 if(disallow_rendering)
 171                         return;
 172         }
 173
 174         renderer.set_mesh(this);
 175         renderer.set_winding_test(winding);
 176
 177         for(list<Batch>::const_iterator i=batches.begin(); i!=batches.end(); ++i)
 178                 renderer.draw(*i);
 179 }
 180
 181 void Mesh::bind() const
 182 {
 183         /* If VAOs are not supported, vao_id is zero and set_current won't get
 184         called.  Thus unbind won't try to call a null function either. */
 185         if(!vao_id)
 186         {
 187                 unbind();
 188                 vertices.apply(false);
 189         }
 190         else if(set_current(this))
 191         {
 192                 glBindVertexArray(vao_id);
 193                 vertices.refresh();
 194                 if(dirty)
 195                         setup_vao();
 196         }
 197 }
 198
 199 void Mesh::unbind()
 200 {
 201         if(set_current(0))
 202                 glBindVertexArray(0);
 203 }
 204
 205 Resource::AsyncLoader *Mesh::load(IO::Seekable &io, const Resources *)
 206 {
 207         return new AsyncLoader(*this, io);
 208 }
 209
 210 UInt64 Mesh::get_data_size() const
 211 {
 212         UInt64 size = 0;
 213         if(vbuf)
 214                 size += vbuf->get_size();
 215         if(ibuf)
 216                 size += ibuf->get_size();
 217         return size;
 218 }
 219
 220 void Mesh::unload()
 221 {
 222         vertices.clear();
 223         vertices.use_buffer(0);
 224         batches.clear();
 225         delete vbuf;
 226         delete ibuf;
 227         defer_buffers = (vbuf || ibuf);
 228         vbuf = 0;
 229         ibuf = 0;
 230 }
 231
 232
 233 Mesh::Loader::Loader(Mesh &m):
 234         DataFile::ObjectLoader<Mesh>(m)
 235 {
 236         add("batch",    &Loader::batch);
 237         add("vertices", &Loader::vertices);
 238         add("winding",  &Loader::winding);
 239 }
 240
 241 void Mesh::Loader::vertices(const vector<VertexComponent> &c)
 242 {
 243         if(c.empty())
 244                 throw invalid_argument("No vertex components");
 245
 246         VertexFormat fmt;
 247         for(vector<VertexComponent>::const_iterator i=c.begin(); i!=c.end(); ++i)
 248                 fmt = (fmt, *i);
 249         obj.vertices.reset(fmt);
 250         obj.dirty = true;
 251         load_sub(obj.vertices);
 252 }
 253
 254 void Mesh::Loader::batch(PrimitiveType p)
 255 {
 256         Batch btc(p);
 257         load_sub(btc);
 258         obj.add_batch(btc);
 259 }
 260
 261 void Mesh::Loader::winding(FaceWinding w)
 262 {
 263         if(w==CLOCKWISE)
 264                 obj.winding = &WindingTest::clockwise();
 265         else if(w==COUNTERCLOCKWISE)
 266                 obj.winding = &WindingTest::counterclockwise();
 267 }
 268
 269
 270 Mesh::AsyncLoader::AsyncLoader(Mesh &m, IO::Seekable &i):
 271         mesh(m),
 272         io(i),
 273         vertex_updater(0),
 274         index_updater(0),
 275         phase(0)
 276 {
 277         // Make sure the extension is initialized in the rendering thread.
 278         (bool)NV_primitive_restart;
 279
 280         mesh.disallow_rendering = true;
 281         if(mesh.defer_buffers)
 282                 mesh.create_buffers();
 283 }
 284
 285 Mesh::AsyncLoader::~AsyncLoader()
 286 {
 287         mesh.disallow_rendering = false;
 288         delete vertex_updater;
 289         delete index_updater;
 290 }
 291
 292 bool Mesh::AsyncLoader::needs_sync() const
 293 {
 294         return phase%2;
 295 }
 296
 297 bool Mesh::AsyncLoader::process()
 298 {
 299         if(phase==0)
 300         {
 301                 // TODO use correct filename
 302                 DataFile::Parser parser(io, "async");
 303                 Loader loader(mesh);
 304                 loader.load(parser);
 305         }
 306         else if(phase==1)
 307         {
 308                 vertex_updater = mesh.vertices.refresh_async();
 309                 if(!mesh.batches.empty())
 310                         index_updater = mesh.batches.front().refresh_async();
 311         }
 312         else if(phase==2)
 313         {
 314                 if(vertex_updater)
 315                         vertex_updater->upload_data();
 316                 if(index_updater)
 317                         index_updater->upload_data();
 318         }
 319         else if(phase==3)
 320         {
 321                 delete vertex_updater;
 322                 vertex_updater = 0;
 323                 delete index_updater;
 324                 index_updater = 0;
 325         }
 326
 327         ++phase;
 328         if(phase==1 && !mesh.vbuf && !mesh.ibuf)
 329                 phase += 3;
 330         return phase>3;
 331 }
 332
 333 } // namespace GL
 334 } // namespace Msp