source/renderer.cpp

   1 #include "batch.h"
   2 #include "buffer.h"
   3 #include "camera.h"
   4 #include "clipping.h"
   5 #include "error.h"
   6 #include "lighting.h"
   7 #include "material.h"
   8 #include "mesh.h"
   9 #include "program.h"
  10 #include "programdata.h"
  11 #include "renderable.h"
  12 #include "renderer.h"
  13 #include "texture.h"
  14 #include "texturing.h"
  15 #include "texunit.h"
  16 #include "vertexarray.h"
  17 #include "windingtest.h"
  18
  19 using namespace std;
  20
  21 namespace Msp {
  22 namespace GL {
  23
  24 Renderer::Renderer(const Camera *c):
  25         mtx_stack(*this),
  26         changed(0),
  27         matrices_loaded(false),
  28         shdata_applied(0),
  29         camera(0),
  30         state_stack(1)
  31 {
  32         state_stack.reserve(16);
  33         shdata_stack.reserve(32);
  34         state = &state_stack.back();
  35
  36         begin(c);
  37 }
  38
  39 Renderer::~Renderer()
  40 {
  41         end();
  42 }
  43
  44 void Renderer::begin(const Camera *c)
  45 {
  46         if(state_stack.size()>1)
  47                 throw invalid_operation("Renderer::begin");
  48
  49         reset_state();
  50         excluded.clear();
  51         camera = c;
  52
  53         if(camera)
  54         {
  55                 mtx_stack.load(camera->get_matrix());
  56                 standard_shdata.uniform("projection_matrix", camera->get_projection_matrix());
  57         }
  58         else
  59         {
  60                 mtx_stack.load(MatrixStack::modelview().top());
  61                 standard_shdata.uniform("projection_matrix", MatrixStack::projection().top());
  62         }
  63 }
  64
  65 void Renderer::set_matrix(const Matrix &matrix)
  66 {
  67         mtx_stack.load(matrix);
  68 }
  69
  70 void Renderer::transform(const Matrix &matrix)
  71 {
  72         mtx_stack *= matrix;
  73 }
  74
  75 void Renderer::set_texture(const Texture *t)
  76 {
  77         state->texture = t;
  78         state->texturing = 0;
  79 }
  80
  81 void Renderer::set_texturing(const Texturing *t)
  82 {
  83         state->texturing = t;
  84         state->texture = 0;
  85 }
  86
  87 unsigned Renderer::allocate_effect_texunit()
  88 {
  89         return --state->lowest_effect_texunit;
  90 }
  91
  92 void Renderer::set_material(const Material *m)
  93 {
  94         state->material = m;
  95 }
  96
  97 void Renderer::set_lighting(const Lighting *l)
  98 {
  99         state->lighting = l;
 100         state->lighting_matrix = mtx_stack.top();
 101         if(l)
 102                 l->update_shader_data(standard_shdata, mtx_stack.top());
 103         changed |= LIGHTING;
 104 }
 105
 106 void Renderer::set_clipping(const Clipping *c)
 107 {
 108         state->clipping = c;
 109         state->clipping_matrix = mtx_stack.top();
 110         if(c)
 111                 c->update_shader_data(standard_shdata, mtx_stack.top());
 112         changed |= CLIPPING;
 113 }
 114
 115 void Renderer::set_shader_program(const Program *p, const ProgramData *d)
 116 {
 117         state->shprog = p;
 118         if(p && d)
 119                 add_shader_data(*d);
 120 }
 121
 122 void Renderer::add_shader_data(const ProgramData &d)
 123 {
 124         shdata_stack.push_back(&d);
 125         state->shdata_count = shdata_stack.size();
 126         changed |= SHADER_DATA;
 127 }
 128
 129 void Renderer::set_mesh(const Mesh *m)
 130 {
 131         state->mesh = m;
 132 }
 133
 134 void Renderer::set_winding_test(const WindingTest *w)
 135 {
 136         state->winding_test = w;
 137 }
 138
 139 void Renderer::set_reverse_winding(bool r)
 140 {
 141         state->reverse_winding = r;
 142 }
 143
 144 void Renderer::push_state()
 145 {
 146         state_stack.push_back(state_stack.back());
 147         state = &state_stack.back();
 148         mtx_stack.push();
 149 }
 150
 151 void Renderer::pop_state()
 152 {
 153         if(state_stack.size()==1)
 154                 throw stack_underflow("Renderer::pop_state");
 155
 156         const Lighting *old_lighting = state->lighting;
 157         const Clipping *old_clipping = state->clipping;
 158         state_stack.pop_back();
 159         state = &state_stack.back();
 160         if(shdata_stack.size()>state->shdata_count)
 161         {
 162                 shdata_stack.erase(shdata_stack.begin()+state->shdata_count, shdata_stack.end());
 163                 changed |= SHADER_DATA;
 164         }
 165         shdata_applied = min<unsigned>(shdata_applied, shdata_stack.size());
 166         mtx_stack.pop();
 167         changed |= MATRIX;
 168         if(state->lighting!=old_lighting)
 169         {
 170                 if(state->lighting)
 171                         state->lighting->update_shader_data(standard_shdata, state->lighting_matrix);
 172                 changed |= LIGHTING;
 173         }
 174         if(state->clipping!=old_clipping)
 175         {
 176                 if(state->clipping)
 177                         state->clipping->update_shader_data(standard_shdata, state->clipping_matrix);
 178                 changed |= CLIPPING;
 179         }
 180 }
 181
 182 void Renderer::escape()
 183 {
 184         apply_state();
 185         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 186         matrices_loaded = false;
 187 }
 188
 189 void Renderer::end()
 190 {
 191         if(state_stack.size()>1)
 192                 throw invalid_operation("Renderer::end");
 193
 194         reset_state();
 195
 196         Mesh::unbind();
 197         Texturing::unbind();
 198         Texture::unbind_from(0);
 199         Material::unbind();
 200         Lighting::unbind();
 201         Clipping::unbind();
 202         Program::unbind();
 203         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 204         WindingTest::unbind();
 205 }
 206
 207 void Renderer::exclude(const Renderable &renderable)
 208 {
 209         excluded.insert(&renderable);
 210 }
 211
 212 void Renderer::include(const Renderable &renderable)
 213 {
 214         excluded.erase(&renderable);
 215 }
 216
 217 void Renderer::render(const Renderable &renderable, const Tag &tag)
 218 {
 219         if(!excluded.count(&renderable))
 220                 renderable.render(*this, tag);
 221 }
 222
 223 void Renderer::draw(const Batch &batch)
 224 {
 225         apply_state();
 226
 227         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 228         if(state->mesh && legacy_bindings)
 229         {
 230                 if(const Buffer *ibuf = state->mesh->get_index_buffer())
 231                         ibuf->bind_to(ELEMENT_ARRAY_BUFFER);
 232                 else
 233                         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 234         }
 235
 236         batch.draw();
 237 }
 238
 239 void Renderer::apply_state()
 240 {
 241         /* We (mostly) let the objects themselves figure out if the binding has
 242         changed */
 243
 244         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 245
 246         if(state->texturing)
 247                 state->texturing->bind();
 248         else
 249         {
 250                 Texturing::unbind();
 251                 if(state->texture)
 252                         state->texture->bind_to(0);
 253                 else
 254                         Texture::unbind_from(0);
 255         }
 256
 257         if(legacy_bindings)
 258         {
 259                 if(state->material)
 260                         state->material->bind();
 261                 else
 262                         Material::unbind();
 263
 264                 if(changed&LIGHTING)
 265                 {
 266                         if(state->lighting)
 267                         {
 268                                 MatrixStack::modelview() = state->lighting_matrix;
 269                                 state->lighting->bind();
 270                                 changed = (changed&~LIGHTING)|LEGACY_MATRIX;
 271                         }
 272                         else
 273                                 Lighting::unbind();
 274                 }
 275         }
 276
 277         if(state->clipping)
 278         {
 279                 if(legacy_bindings)
 280                 {
 281                         if(changed&CLIPPING)
 282                         {
 283                                 MatrixStack::modelview() = state->clipping_matrix;
 284                                 state->clipping->bind(true);
 285                                 changed = (changed&~CLIPPING)|LEGACY_MATRIX;
 286                         }
 287                 }
 288                 else
 289                         state->clipping->bind(false);
 290         }
 291         else
 292                 Clipping::unbind();
 293
 294         if(state->shprog)
 295         {
 296                 bool shprog_changed = (state->shprog!=Program::current());
 297                 state->shprog->bind();
 298
 299                 if(!legacy_bindings)
 300                 {
 301                         if(changed&MODERN_MATRIX)
 302                         {
 303                                 const Matrix &m = mtx_stack.top();
 304                                 standard_shdata.uniform("eye_obj_matrix", mtx_stack.top());
 305                                 LinAl::SquareMatrix<float, 3> nm = m.block<3, 3>(0, 0);
 306                                 nm = transpose(invert(nm));
 307                                 standard_shdata.uniform_matrix3("eye_obj_normal_matrix", &nm(0, 0));
 308                                 changed &= ~MODERN_MATRIX;
 309                         }
 310
 311                         if(state->material)
 312                                 state->material->get_shader_data().apply();
 313                         standard_shdata.apply();
 314                 }
 315
 316                 if((changed&SHADER_DATA) || shprog_changed)
 317                 {
 318                         vector<const ProgramData *>::const_iterator i = shdata_stack.begin();
 319                         if(!shprog_changed)
 320                                 i += shdata_applied;
 321                         for(; i!=shdata_stack.end(); ++i)
 322                                 (*i)->apply();
 323                         changed &= ~SHADER_DATA;
 324                         shdata_applied = shdata_stack.size();
 325                 }
 326         }
 327         else
 328                 Program::unbind();
 329
 330         if(state->mesh)
 331         {
 332                 if(legacy_bindings)
 333                 {
 334                         Mesh::unbind();
 335                         state->mesh->get_vertices().apply();
 336                 }
 337                 else
 338                         state->mesh->bind();
 339         }
 340         else
 341                 Mesh::unbind();
 342
 343         if(state->winding_test)
 344         {
 345                 if(state->reverse_winding)
 346                         state->winding_test->get_reverse().bind();
 347                 else
 348                         state->winding_test->bind();
 349         }
 350         else
 351                 WindingTest::unbind();
 352
 353         if(legacy_bindings)
 354         {
 355                 if(!matrices_loaded)
 356                 {
 357                         MatrixStack::modelview().push();
 358                         if(camera)
 359                         {
 360                                 MatrixStack::projection().push();
 361                                 camera->apply();
 362                         }
 363                         matrices_loaded = true;
 364                 }
 365
 366                 if(changed&LEGACY_MATRIX)
 367                 {
 368                         MatrixStack::modelview() = mtx_stack.top();
 369                         changed &= ~LEGACY_MATRIX;
 370                 }
 371         }
 372 }
 373
 374 void Renderer::reset_state()
 375 {
 376         if(!matrices_loaded)
 377                 return;
 378
 379         if(camera)
 380                 MatrixStack::projection().pop();
 381         MatrixStack::modelview().pop();
 382         matrices_loaded = false;
 383         changed |= MATRIX;
 384
 385         *state = State();
 386 }
 387
 388
 389 Renderer::State::State():
 390         texture(0),
 391         texturing(0),
 392         lowest_effect_texunit(TexUnit::get_n_units()),
 393         material(0),
 394         lighting(0),
 395         clipping(0),
 396         shprog(0),
 397         shdata_count(0),
 398         mesh(0),
 399         winding_test(0),
 400         reverse_winding(false)
 401 { }
 402
 403
 404 Renderer::MtxStack::MtxStack(Renderer &r):
 405         renderer(r)
 406 { }
 407
 408 void Renderer::MtxStack::update()
 409 {
 410         renderer.changed |= MATRIX;
 411 }
 412
 413 } // namespace GL
 414 } // namespace Msp