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         changed |= MATERIAL_SHDATA;
  96 }
  97
  98 void Renderer::set_lighting(const Lighting *l)
  99 {
 100         state->lighting = l;
 101         state->lighting_matrix = mtx_stack.top();
 102         if(l)
 103         {
 104                 l->update_shader_data(standard_shdata, mtx_stack.top());
 105                 changed |= STANDARD_SHDATA;
 106         }
 107         changed |= LIGHTING;
 108 }
 109
 110 void Renderer::set_clipping(const Clipping *c)
 111 {
 112         state->clipping = c;
 113         state->clipping_matrix = mtx_stack.top();
 114         if(c)
 115                 c->update_shader_data(standard_shdata, mtx_stack.top());
 116         changed |= CLIPPING;
 117 }
 118
 119 void Renderer::set_shader_program(const Program *p, const ProgramData *d)
 120 {
 121         state->shprog = p;
 122         if(p && d)
 123                 add_shader_data(*d);
 124 }
 125
 126 void Renderer::add_shader_data(const ProgramData &d)
 127 {
 128         shdata_stack.push_back(&d);
 129         state->shdata_count = shdata_stack.size();
 130         changed |= SHADER_DATA;
 131 }
 132
 133 void Renderer::set_mesh(const Mesh *m)
 134 {
 135         state->mesh = m;
 136 }
 137
 138 void Renderer::set_winding_test(const WindingTest *w)
 139 {
 140         state->winding_test = w;
 141 }
 142
 143 void Renderer::set_reverse_winding(bool r)
 144 {
 145         state->reverse_winding = r;
 146 }
 147
 148 void Renderer::push_state()
 149 {
 150         state_stack.push_back(state_stack.back());
 151         state = &state_stack.back();
 152         mtx_stack.push();
 153 }
 154
 155 void Renderer::pop_state()
 156 {
 157         if(state_stack.size()==1)
 158                 throw stack_underflow("Renderer::pop_state");
 159
 160         const Lighting *old_lighting = state->lighting;
 161         const Clipping *old_clipping = state->clipping;
 162         state_stack.pop_back();
 163         state = &state_stack.back();
 164         if(shdata_stack.size()>state->shdata_count)
 165         {
 166                 shdata_stack.erase(shdata_stack.begin()+state->shdata_count, shdata_stack.end());
 167                 changed |= SHADER_DATA;
 168         }
 169         shdata_applied = min<unsigned>(shdata_applied, shdata_stack.size());
 170         mtx_stack.pop();
 171         changed |= MATRIX;
 172         if(state->lighting!=old_lighting)
 173         {
 174                 if(state->lighting)
 175                         state->lighting->update_shader_data(standard_shdata, state->lighting_matrix);
 176                 changed |= LIGHTING;
 177         }
 178         if(state->clipping!=old_clipping)
 179         {
 180                 if(state->clipping)
 181                         state->clipping->update_shader_data(standard_shdata, state->clipping_matrix);
 182                 changed |= CLIPPING;
 183         }
 184 }
 185
 186 void Renderer::escape()
 187 {
 188         apply_state();
 189         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 190         matrices_loaded = false;
 191 }
 192
 193 void Renderer::end()
 194 {
 195         if(state_stack.size()>1)
 196                 throw invalid_operation("Renderer::end");
 197
 198         reset_state();
 199
 200         Mesh::unbind();
 201         Texturing::unbind();
 202         Texture::unbind_from(0);
 203         Material::unbind();
 204         Lighting::unbind();
 205         Clipping::unbind();
 206         Program::unbind();
 207         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 208         WindingTest::unbind();
 209 }
 210
 211 void Renderer::exclude(const Renderable &renderable)
 212 {
 213         excluded.insert(&renderable);
 214 }
 215
 216 void Renderer::include(const Renderable &renderable)
 217 {
 218         excluded.erase(&renderable);
 219 }
 220
 221 void Renderer::render(const Renderable &renderable, const Tag &tag)
 222 {
 223         if(!excluded.count(&renderable))
 224                 renderable.render(*this, tag);
 225 }
 226
 227 void Renderer::draw(const Batch &batch)
 228 {
 229         apply_state();
 230
 231         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 232         if(state->mesh && legacy_bindings)
 233         {
 234                 if(const Buffer *ibuf = state->mesh->get_index_buffer())
 235                         ibuf->bind_to(ELEMENT_ARRAY_BUFFER);
 236                 else
 237                         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 238         }
 239
 240         batch.draw();
 241 }
 242
 243 void Renderer::apply_state()
 244 {
 245         /* We (mostly) let the objects themselves figure out if the binding has
 246         changed */
 247
 248         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 249
 250         if(state->texturing)
 251                 state->texturing->bind();
 252         else
 253         {
 254                 Texturing::unbind();
 255                 if(state->texture)
 256                         state->texture->bind_to(0);
 257                 else
 258                         Texture::unbind_from(0);
 259         }
 260
 261         if(legacy_bindings)
 262         {
 263                 if(state->material)
 264                         state->material->bind();
 265                 else
 266                         Material::unbind();
 267
 268                 if(changed&LIGHTING)
 269                 {
 270                         if(state->lighting)
 271                         {
 272                                 MatrixStack::modelview() = state->lighting_matrix;
 273                                 state->lighting->bind();
 274                                 changed = (changed&~LIGHTING)|LEGACY_MATRIX;
 275                         }
 276                         else
 277                                 Lighting::unbind();
 278                 }
 279         }
 280
 281         if(state->clipping)
 282         {
 283                 if(legacy_bindings)
 284                 {
 285                         if(changed&CLIPPING)
 286                         {
 287                                 MatrixStack::modelview() = state->clipping_matrix;
 288                                 state->clipping->bind(true);
 289                                 changed = (changed&~CLIPPING)|LEGACY_MATRIX;
 290                         }
 291                 }
 292                 else
 293                         state->clipping->bind(false);
 294         }
 295         else
 296                 Clipping::unbind();
 297
 298         if(state->shprog)
 299         {
 300                 bool shprog_changed = (state->shprog!=Program::current());
 301                 state->shprog->bind();
 302
 303                 if(!legacy_bindings)
 304                 {
 305                         if(changed&MODERN_MATRIX)
 306                         {
 307                                 const Matrix &m = mtx_stack.top();
 308                                 standard_shdata.uniform("eye_obj_matrix", mtx_stack.top());
 309                                 LinAl::SquareMatrix<float, 3> nm = m.block<3, 3>(0, 0);
 310                                 nm = transpose(invert(nm));
 311                                 standard_shdata.uniform_matrix3("eye_obj_normal_matrix", &nm(0, 0));
 312                                 changed = (changed&~MODERN_MATRIX)|STANDARD_SHDATA;
 313                         }
 314
 315                         if(state->material && (changed&MATERIAL_SHDATA))
 316                         {
 317                                 state->material->get_shader_data().apply();
 318                                 changed &= ~MATERIAL_SHDATA;
 319                         }
 320
 321                         if(changed&STANDARD_SHDATA)
 322                         {
 323                                 standard_shdata.apply();
 324                                 changed &= ~STANDARD_SHDATA;
 325                         }
 326                 }
 327
 328                 if((changed&SHADER_DATA) || shprog_changed)
 329                 {
 330                         vector<const ProgramData *>::const_iterator i = shdata_stack.begin();
 331                         if(!shprog_changed)
 332                                 i += shdata_applied;
 333                         for(; i!=shdata_stack.end(); ++i)
 334                                 (*i)->apply();
 335                         changed &= ~SHADER_DATA;
 336                         shdata_applied = shdata_stack.size();
 337                 }
 338         }
 339         else
 340                 Program::unbind();
 341
 342         if(state->mesh)
 343         {
 344                 if(legacy_bindings)
 345                 {
 346                         Mesh::unbind();
 347                         state->mesh->get_vertices().apply();
 348                 }
 349                 else
 350                         state->mesh->bind();
 351         }
 352         else
 353                 Mesh::unbind();
 354
 355         if(state->winding_test)
 356         {
 357                 if(state->reverse_winding)
 358                         state->winding_test->get_reverse().bind();
 359                 else
 360                         state->winding_test->bind();
 361         }
 362         else
 363                 WindingTest::unbind();
 364
 365         if(legacy_bindings)
 366         {
 367                 if(!matrices_loaded)
 368                 {
 369                         MatrixStack::modelview().push();
 370                         if(camera)
 371                         {
 372                                 MatrixStack::projection().push();
 373                                 camera->apply();
 374                         }
 375                         matrices_loaded = true;
 376                 }
 377
 378                 if(changed&LEGACY_MATRIX)
 379                 {
 380                         MatrixStack::modelview() = mtx_stack.top();
 381                         changed &= ~LEGACY_MATRIX;
 382                 }
 383         }
 384 }
 385
 386 void Renderer::reset_state()
 387 {
 388         if(!matrices_loaded)
 389                 return;
 390
 391         if(camera)
 392                 MatrixStack::projection().pop();
 393         MatrixStack::modelview().pop();
 394         matrices_loaded = false;
 395         changed |= MATRIX;
 396
 397         *state = State();
 398 }
 399
 400
 401 Renderer::State::State():
 402         texture(0),
 403         texturing(0),
 404         lowest_effect_texunit(TexUnit::get_n_units()),
 405         material(0),
 406         lighting(0),
 407         clipping(0),
 408         shprog(0),
 409         shdata_count(0),
 410         mesh(0),
 411         winding_test(0),
 412         reverse_winding(false)
 413 { }
 414
 415
 416 Renderer::MtxStack::MtxStack(Renderer &r):
 417         renderer(r)
 418 { }
 419
 420 void Renderer::MtxStack::update()
 421 {
 422         renderer.changed |= MATRIX;
 423 }
 424
 425 } // namespace GL
 426 } // namespace Msp