source/mesh.cpp

   1 #include <msp/gl/extensions/arb_vertex_array_object.h>
   2 #include <msp/gl/extensions/arb_vertex_shader.h>
   3 #include <msp/gl/extensions/nv_primitive_restart.h>
   4 #include "buffer.h"
   5 #include "error.h"
   6 #include "mesh.h"
   7 #include "renderer.h"
   8 #include "resourcemanager.h"
   9
  10 using namespace std;
  11
  12 namespace Msp {
  13 namespace GL {
  14
  15 Mesh::Mesh(ResourceManager *rm):
  16         vertices(VERTEX3)
  17 {
  18         init(rm);
  19 }
  20
  21 Mesh::Mesh(const VertexFormat &f, ResourceManager *rm):
  22         vertices(f)
  23 {
  24         init(rm);
  25 }
  26
  27 void Mesh::init(ResourceManager *rm)
  28 {
  29         vbuf = 0;
  30         ibuf = 0;
  31         vao_id = 0;
  32         defer_buffers = true;
  33         dirty = true;
  34         winding = 0;
  35
  36         if(rm)
  37                 set_manager(rm);
  38 }
  39
  40 Mesh::~Mesh()
  41 {
  42         delete vbuf;
  43         delete ibuf;
  44         if(vao_id)
  45                 glDeleteVertexArrays(1, &vao_id);
  46 }
  47
  48 void Mesh::clear()
  49 {
  50         vertices.clear();
  51         batches.clear();
  52 }
  53
  54 void Mesh::use_buffers(bool b)
  55 {
  56         defer_buffers = false;
  57         if(b)
  58                 create_buffers();
  59         else
  60         {
  61                 vertices.use_buffer(0);
  62                 delete vbuf;
  63                 vbuf = 0;
  64                 delete ibuf;
  65                 ibuf = 0;
  66         }
  67 }
  68
  69 void Mesh::create_buffers()
  70 {
  71         defer_buffers = false;
  72
  73         if(!vbuf)
  74                 vbuf = new Buffer(ARRAY_BUFFER);
  75         vertices.use_buffer(vbuf);
  76
  77         if(!ibuf)
  78                 ibuf = new Buffer(ELEMENT_ARRAY_BUFFER);
  79
  80         if(ARB_vertex_array_object && !vao_id)
  81                 glGenVertexArrays(1, &vao_id);
  82 }
  83
  84 void Mesh::setup_vao() const
  85 {
  86         Bind bind_vbuf(vbuf, ARRAY_BUFFER);
  87
  88         const VertexFormat &fmt = vertices.get_format();
  89         unsigned stride = get_stride(fmt)*sizeof(float);
  90         float *ptr = 0;
  91         for(const unsigned char *c=fmt.begin(); c!=fmt.end(); ++c)
  92         {
  93                 unsigned t = get_component_type(*c);
  94                 if(t>=get_component_type(ATTRIB1))
  95                         t -= get_component_type(ATTRIB1);
  96                 unsigned sz = get_component_size(*c);
  97                 if(*c==COLOR4_UBYTE)
  98                         glVertexAttribPointer(t, 4, GL_UNSIGNED_BYTE, true, stride, ptr);
  99                 else
 100                         glVertexAttribPointer(t, sz, GL_FLOAT, false, stride, ptr);
 101                 glEnableVertexAttribArray(t);
 102                 ptr += sz;
 103         }
 104         glBindBuffer(ELEMENT_ARRAY_BUFFER, ibuf->get_id());
 105
 106         dirty = false;
 107 }
 108
 109 unsigned Mesh::get_n_vertices() const
 110 {
 111         return vertices.size();
 112 }
 113
 114 float *Mesh::modify_vertex(unsigned i)
 115 {
 116         return vertices.modify(i);
 117 }
 118
 119 void Mesh::add_batch(const Batch &b)
 120 {
 121         if(defer_buffers)
 122                 create_buffers();
 123
 124         if(!batches.empty() && batches.back().can_append(b.get_type()))
 125                 batches.back().append(b);
 126         else
 127         {
 128                 Batch *prev = (batches.empty() ? 0 : &batches.back());
 129                 batches.push_back(b);
 130                 if(ibuf)
 131                         batches.back().use_buffer(ibuf, prev);
 132         }
 133 }
 134
 135 void Mesh::set_winding(const WindingTest *w)
 136 {
 137         winding = w;
 138 }
 139
 140 void Mesh::draw() const
 141 {
 142         const Mesh *cur = current();
 143         if(cur && cur!=this)
 144                 throw invalid_operation("Mesh::draw");
 145
 146         if(manager)
 147         {
 148                 manager->resource_used(*this);
 149                 if(disallow_rendering)
 150                         return;
 151         }
 152
 153         if(!current())
 154                 vertices.apply();
 155         Bind bind_ibuf(ibuf, ELEMENT_ARRAY_BUFFER);
 156         Bind bind_winding(winding);
 157
 158         for(list<Batch>::const_iterator i=batches.begin(); i!=batches.end(); ++i)
 159                 i->draw();
 160 }
 161
 162 void Mesh::draw(Renderer &renderer) const
 163 {
 164         if(manager)
 165         {
 166                 manager->resource_used(*this);
 167                 if(disallow_rendering)
 168                         return;
 169         }
 170
 171         renderer.set_mesh(this);
 172         renderer.set_element_buffer(ibuf);
 173         renderer.set_winding_test(winding);
 174
 175         for(list<Batch>::const_iterator i=batches.begin(); i!=batches.end(); ++i)
 176                 renderer.draw(*i);
 177 }
 178
 179 void Mesh::bind() const
 180 {
 181         /* If VAOs are not supported, vao_id is zero and set_current won't get
 182         called.  Thus unbind won't try to call a null function either. */
 183         if(!vao_id)
 184         {
 185                 unbind();
 186                 vertices.apply();
 187         }
 188         else if(set_current(this))
 189         {
 190                 glBindVertexArray(vao_id);
 191                 vertices.refresh();
 192                 if(dirty)
 193                         setup_vao();
 194         }
 195 }
 196
 197 void Mesh::unbind()
 198 {
 199         if(set_current(0))
 200                 glBindVertexArray(0);
 201 }
 202
 203 Resource::AsyncLoader *Mesh::load(IO::Seekable &io)
 204 {
 205         return new AsyncLoader(*this, io);
 206 }
 207
 208 UInt64 Mesh::get_data_size() const
 209 {
 210         UInt64 size = 0;
 211         if(vbuf)
 212                 size += vbuf->get_size();
 213         if(ibuf)
 214                 size += ibuf->get_size();
 215         return size;
 216 }
 217
 218 void Mesh::unload()
 219 {
 220         vertices.clear();
 221         vertices.use_buffer(0);
 222         batches.clear();
 223         delete vbuf;
 224         delete ibuf;
 225         defer_buffers = (vbuf || ibuf);
 226         vbuf = 0;
 227         ibuf = 0;
 228 }
 229
 230
 231 Mesh::Loader::Loader(Mesh &m):
 232         DataFile::ObjectLoader<Mesh>(m)
 233 {
 234         add("batch",    &Loader::batch);
 235         add("vertices", &Loader::vertices);
 236         add("winding",  &Loader::winding);
 237 }
 238
 239 void Mesh::Loader::vertices(const vector<VertexComponent> &c)
 240 {
 241         if(c.empty())
 242                 throw invalid_argument("No vertex components");
 243
 244         VertexFormat fmt;
 245         for(vector<VertexComponent>::const_iterator i=c.begin(); i!=c.end(); ++i)
 246                 fmt = (fmt, *i);
 247         obj.vertices.reset(fmt);
 248         obj.dirty = true;
 249         load_sub(obj.vertices);
 250 }
 251
 252 void Mesh::Loader::batch(PrimitiveType p)
 253 {
 254         Batch btc(p);
 255         load_sub(btc);
 256         obj.add_batch(btc);
 257 }
 258
 259 void Mesh::Loader::winding(FaceWinding w)
 260 {
 261         if(w==CLOCKWISE)
 262                 obj.winding = &WindingTest::clockwise();
 263         else if(w==COUNTERCLOCKWISE)
 264                 obj.winding = &WindingTest::counterclockwise();
 265 }
 266
 267
 268 Mesh::AsyncLoader::AsyncLoader(Mesh &m, IO::Seekable &i):
 269         mesh(m),
 270         io(i),
 271         vertex_updater(0),
 272         index_updater(0),
 273         phase(0)
 274 {
 275         // Make sure the extension is initialized in the rendering thread.
 276         (bool)NV_primitive_restart;
 277
 278         mesh.disallow_rendering = true;
 279         if(mesh.defer_buffers)
 280                 mesh.create_buffers();
 281 }
 282
 283 Mesh::AsyncLoader::~AsyncLoader()
 284 {
 285         mesh.disallow_rendering = false;
 286 }
 287
 288 bool Mesh::AsyncLoader::needs_sync() const
 289 {
 290         return phase%2;
 291 }
 292
 293 bool Mesh::AsyncLoader::process()
 294 {
 295         if(phase==0)
 296         {
 297                 // TODO use correct filename
 298                 DataFile::Parser parser(io, "async");
 299                 Loader loader(mesh);
 300                 loader.load(parser);
 301         }
 302         else if(phase==1)
 303         {
 304                 vertex_updater = mesh.vertices.refresh_async();
 305                 if(!mesh.batches.empty())
 306                         index_updater = mesh.batches.front().refresh_async();
 307         }
 308         else if(phase==2)
 309         {
 310                 if(vertex_updater)
 311                         vertex_updater->upload_data();
 312                 if(index_updater)
 313                         index_updater->upload_data();
 314         }
 315         else if(phase==3)
 316         {
 317                 delete vertex_updater;
 318                 delete index_updater;
 319         }
 320
 321         ++phase;
 322         if(phase==1 && !mesh.vbuf && !mesh.ibuf)
 323                 phase += 3;
 324         return phase>3;
 325 }
 326
 327 } // namespace GL
 328 } // namespace Msp