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         Program::unbind();
 202         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 203         WindingTest::unbind();
 204 }
 205
 206 void Renderer::exclude(const Renderable &renderable)
 207 {
 208         excluded.insert(&renderable);
 209 }
 210
 211 void Renderer::include(const Renderable &renderable)
 212 {
 213         excluded.erase(&renderable);
 214 }
 215
 216 void Renderer::render(const Renderable &renderable, const Tag &tag)
 217 {
 218         if(!excluded.count(&renderable))
 219                 renderable.render(*this, tag);
 220 }
 221
 222 void Renderer::draw(const Batch &batch)
 223 {
 224         apply_state();
 225
 226         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 227         if(state->mesh && legacy_bindings)
 228         {
 229                 if(const Buffer *ibuf = state->mesh->get_index_buffer())
 230                         ibuf->bind_to(ELEMENT_ARRAY_BUFFER);
 231                 else
 232                         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 233         }
 234
 235         batch.draw();
 236 }
 237
 238 void Renderer::apply_state()
 239 {
 240         /* We (mostly) let the objects themselves figure out if the binding has
 241         changed */
 242
 243         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 244
 245         if(state->texturing)
 246                 state->texturing->bind();
 247         else
 248         {
 249                 Texturing::unbind();
 250                 if(state->texture)
 251                         state->texture->bind_to(0);
 252                 else
 253                         Texture::unbind_from(0);
 254         }
 255
 256         if(legacy_bindings)
 257         {
 258                 if(state->material)
 259                         state->material->bind();
 260                 else
 261                         Material::unbind();
 262
 263                 if(changed&LIGHTING)
 264                 {
 265                         if(state->lighting)
 266                         {
 267                                 MatrixStack::modelview() = state->lighting_matrix;
 268                                 state->lighting->bind();
 269                                 changed = (changed&~LIGHTING)|LEGACY_MATRIX;
 270                         }
 271                         else
 272                                 Lighting::unbind();
 273                 }
 274         }
 275
 276         if(changed&CLIPPING)
 277         {
 278                 if(state->clipping)
 279                 {
 280                         if(legacy_bindings)
 281                         {
 282                                 MatrixStack::modelview() = state->clipping_matrix;
 283                                 state->clipping->bind(true);
 284                                 changed = (changed&~CLIPPING)|LEGACY_MATRIX;
 285                         }
 286                         else
 287                                 state->clipping->bind(false);
 288                 }
 289                 else
 290                         Clipping::unbind();
 291         }
 292
 293         if(state->shprog)
 294         {
 295                 bool shprog_changed = (state->shprog!=Program::current());
 296                 state->shprog->bind();
 297
 298                 if(!legacy_bindings)
 299                 {
 300                         if(changed&MODERN_MATRIX)
 301                         {
 302                                 const Matrix &m = mtx_stack.top();
 303                                 standard_shdata.uniform("eye_obj_matrix", mtx_stack.top());
 304                                 LinAl::SquareMatrix<float, 3> nm = m.block<3, 3>(0, 0);
 305                                 nm = transpose(invert(nm));
 306                                 standard_shdata.uniform_matrix3("eye_obj_normal_matrix", &nm(0, 0));
 307                                 changed &= ~MODERN_MATRIX;
 308                         }
 309
 310                         if(state->material)
 311                                 state->material->get_shader_data().apply();
 312                         standard_shdata.apply();
 313                 }
 314
 315                 if((changed&SHADER_DATA) || shprog_changed)
 316                 {
 317                         vector<const ProgramData *>::const_iterator i = shdata_stack.begin();
 318                         if(!shprog_changed)
 319                                 i += shdata_applied;
 320                         for(; i!=shdata_stack.end(); ++i)
 321                                 (*i)->apply();
 322                         changed &= ~SHADER_DATA;
 323                         shdata_applied = shdata_stack.size();
 324                 }
 325         }
 326         else
 327                 Program::unbind();
 328
 329         if(state->mesh)
 330         {
 331                 if(legacy_bindings)
 332                 {
 333                         Mesh::unbind();
 334                         state->mesh->get_vertices().apply();
 335                 }
 336                 else
 337                         state->mesh->bind();
 338         }
 339         else
 340                 Mesh::unbind();
 341
 342         if(state->winding_test)
 343         {
 344                 if(state->reverse_winding)
 345                         state->winding_test->get_reverse().bind();
 346                 else
 347                         state->winding_test->bind();
 348         }
 349         else
 350                 WindingTest::unbind();
 351
 352         if(legacy_bindings)
 353         {
 354                 if(!matrices_loaded)
 355                 {
 356                         MatrixStack::modelview().push();
 357                         if(camera)
 358                         {
 359                                 MatrixStack::projection().push();
 360                                 camera->apply();
 361                         }
 362                         matrices_loaded = true;
 363                 }
 364
 365                 if(changed&LEGACY_MATRIX)
 366                 {
 367                         MatrixStack::modelview() = mtx_stack.top();
 368                         changed &= ~LEGACY_MATRIX;
 369                 }
 370         }
 371 }
 372
 373 void Renderer::reset_state()
 374 {
 375         if(!matrices_loaded)
 376                 return;
 377
 378         if(camera)
 379                 MatrixStack::projection().pop();
 380         MatrixStack::modelview().pop();
 381         matrices_loaded = false;
 382         changed |= MATRIX;
 383
 384         *state = State();
 385 }
 386
 387
 388 Renderer::State::State():
 389         texture(0),
 390         texturing(0),
 391         lowest_effect_texunit(TexUnit::get_n_units()),
 392         material(0),
 393         lighting(0),
 394         clipping(0),
 395         shprog(0),
 396         shdata_count(0),
 397         mesh(0),
 398         winding_test(0),
 399         reverse_winding(false)
 400 { }
 401
 402
 403 Renderer::MtxStack::MtxStack(Renderer &r):
 404         renderer(r)
 405 { }
 406
 407 void Renderer::MtxStack::update()
 408 {
 409         renderer.changed |= MATRIX;
 410 }
 411
 412 } // namespace GL
 413 } // namespace Msp