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         changed(0),
  26         matrices_loaded(false),
  27         shdata_applied(0),
  28         state_stack(1)
  29 {
  30         state_stack.reserve(16);
  31         shdata_stack.reserve(32);
  32         state = &state_stack.back();
  33
  34         begin(c);
  35 }
  36
  37 Renderer::~Renderer()
  38 {
  39         end();
  40 }
  41
  42 void Renderer::begin(const Camera *c)
  43 {
  44         if(state_stack.size()>1)
  45                 throw invalid_operation("Renderer::begin");
  46
  47         reset_state();
  48         excluded.clear();
  49
  50         if(c)
  51                 set_camera(*c);
  52 }
  53
  54 void Renderer::set_camera(const Camera &c)
  55 {
  56         state->camera = &c;
  57         standard_shdata.uniform("projection_matrix", state->camera->get_projection_matrix());
  58         changed |= STANDARD_SHDATA|LEGACY_PROJECTION;
  59         set_matrix(state->camera->get_view_matrix());
  60 }
  61
  62 void Renderer::set_matrix(const Matrix &matrix)
  63 {
  64         state->modelview_matrix = matrix;
  65         changed |= MATRIX;
  66 }
  67
  68 void Renderer::transform(const Matrix &matrix)
  69 {
  70         state->modelview_matrix *= matrix;
  71         changed |= MATRIX;
  72 }
  73
  74 void Renderer::set_texture(const Texture *t)
  75 {
  76         state->texture = t;
  77         state->texturing = 0;
  78 }
  79
  80 void Renderer::set_texturing(const Texturing *t)
  81 {
  82         state->texturing = t;
  83         state->texture = 0;
  84 }
  85
  86 unsigned Renderer::allocate_effect_texunit()
  87 {
  88         return --state->lowest_effect_texunit;
  89 }
  90
  91 void Renderer::set_material(const Material *m)
  92 {
  93         state->material = m;
  94         changed |= MATERIAL_SHDATA;
  95 }
  96
  97 void Renderer::set_lighting(const Lighting *l)
  98 {
  99         state->lighting = l;
 100         state->lighting_matrix = state->modelview_matrix;
 101         if(l)
 102         {
 103                 l->update_shader_data(standard_shdata, state->lighting_matrix);
 104                 changed |= STANDARD_SHDATA;
 105         }
 106         changed |= LEGACY_LIGHTING;
 107 }
 108
 109 void Renderer::set_clipping(const Clipping *c)
 110 {
 111         state->clipping = c;
 112         state->clipping_matrix = state->modelview_matrix;
 113         if(c)
 114         {
 115                 c->update_shader_data(standard_shdata, state->clipping_matrix);
 116                 changed |= STANDARD_SHDATA;
 117         }
 118         changed |= LEGACY_CLIPPING;
 119 }
 120
 121 void Renderer::set_shader_program(const Program *p, const ProgramData *d)
 122 {
 123         state->shprog = p;
 124         if(p && d)
 125                 add_shader_data(*d);
 126 }
 127
 128 void Renderer::add_shader_data(const ProgramData &d)
 129 {
 130         shdata_stack.push_back(&d);
 131         state->shdata_count = shdata_stack.size();
 132         changed |= SHADER_DATA;
 133 }
 134
 135 void Renderer::set_mesh(const Mesh *m)
 136 {
 137         state->mesh = m;
 138 }
 139
 140 void Renderer::set_winding_test(const WindingTest *w)
 141 {
 142         state->winding_test = w;
 143 }
 144
 145 void Renderer::set_reverse_winding(bool r)
 146 {
 147         state->reverse_winding = r;
 148 }
 149
 150 void Renderer::push_state()
 151 {
 152         state_stack.push_back(state_stack.back());
 153         state = &state_stack.back();
 154 }
 155
 156 void Renderer::pop_state()
 157 {
 158         if(state_stack.size()==1)
 159                 throw stack_underflow("Renderer::pop_state");
 160
 161         const Camera *old_camera = state->camera;
 162         const Lighting *old_lighting = state->lighting;
 163         const Clipping *old_clipping = state->clipping;
 164         state_stack.pop_back();
 165         state = &state_stack.back();
 166         if(shdata_stack.size()>state->shdata_count)
 167         {
 168                 shdata_stack.erase(shdata_stack.begin()+state->shdata_count, shdata_stack.end());
 169                 changed |= SHADER_DATA;
 170         }
 171         shdata_applied = min<unsigned>(shdata_applied, shdata_stack.size());
 172         changed |= MATRIX;
 173         if(state->camera!=old_camera)
 174         {
 175                 standard_shdata.uniform("projection_matrix", state->camera->get_projection_matrix());
 176                 changed |= STANDARD_SHDATA|LEGACY_PROJECTION;
 177         }
 178         if(state->lighting!=old_lighting)
 179         {
 180                 if(state->lighting)
 181                 {
 182                         state->lighting->update_shader_data(standard_shdata, state->lighting_matrix);
 183                         changed |= STANDARD_SHDATA;
 184                 }
 185                 changed |= LEGACY_LIGHTING;
 186         }
 187         if(state->clipping!=old_clipping)
 188         {
 189                 if(state->clipping)
 190                 {
 191                         state->clipping->update_shader_data(standard_shdata, state->clipping_matrix);
 192                         changed |= STANDARD_SHDATA;
 193                 }
 194                 changed |= LEGACY_CLIPPING;
 195         }
 196 }
 197
 198 void Renderer::escape()
 199 {
 200         apply_state();
 201         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 202         matrices_loaded = false;
 203 }
 204
 205 void Renderer::end()
 206 {
 207         if(state_stack.size()>1)
 208                 throw invalid_operation("Renderer::end");
 209
 210         reset_state();
 211
 212         Mesh::unbind();
 213         Texturing::unbind();
 214         Texture::unbind_from(0);
 215         Material::unbind();
 216         Lighting::unbind();
 217         Clipping::unbind();
 218         Program::unbind();
 219         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 220         WindingTest::unbind();
 221 }
 222
 223 void Renderer::exclude(const Renderable &renderable)
 224 {
 225         excluded.insert(&renderable);
 226 }
 227
 228 void Renderer::include(const Renderable &renderable)
 229 {
 230         excluded.erase(&renderable);
 231 }
 232
 233 void Renderer::render(const Renderable &renderable, const Tag &tag)
 234 {
 235         if(!excluded.count(&renderable))
 236                 renderable.render(*this, tag);
 237 }
 238
 239 void Renderer::draw(const Batch &batch)
 240 {
 241         apply_state();
 242
 243         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 244         if(state->mesh && legacy_bindings)
 245         {
 246                 if(const Buffer *ibuf = state->mesh->get_index_buffer())
 247                         ibuf->bind_to(ELEMENT_ARRAY_BUFFER);
 248                 else
 249                         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 250         }
 251
 252         batch.draw();
 253 }
 254
 255 void Renderer::apply_state()
 256 {
 257         /* We (mostly) let the objects themselves figure out if the binding has
 258         changed */
 259
 260         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 261
 262         if(state->texturing)
 263                 state->texturing->bind();
 264         else
 265         {
 266                 Texturing::unbind();
 267                 if(state->texture)
 268                         state->texture->bind_to(0);
 269                 else
 270                         Texture::unbind_from(0);
 271         }
 272
 273         if(legacy_bindings)
 274         {
 275                 if(state->material)
 276                         state->material->bind();
 277                 else
 278                         Material::unbind();
 279
 280                 if(changed&LEGACY_LIGHTING)
 281                 {
 282                         if(state->lighting)
 283                         {
 284                                 MatrixStack::modelview() = state->lighting_matrix;
 285                                 state->lighting->bind();
 286                                 changed = (changed&~LEGACY_LIGHTING)|LEGACY_MATRIX;
 287                         }
 288                         else
 289                                 Lighting::unbind();
 290                 }
 291         }
 292
 293         if(state->clipping)
 294         {
 295                 if(legacy_bindings)
 296                 {
 297                         if(changed&LEGACY_CLIPPING)
 298                         {
 299                                 MatrixStack::modelview() = state->clipping_matrix;
 300                                 state->clipping->bind(true);
 301                                 changed = (changed&~LEGACY_CLIPPING)|LEGACY_MATRIX;
 302                         }
 303                 }
 304                 else
 305                         state->clipping->bind(false);
 306         }
 307         else
 308                 Clipping::unbind();
 309
 310         if(state->shprog)
 311         {
 312                 bool shprog_changed = (state->shprog!=Program::current());
 313                 state->shprog->bind();
 314
 315                 if(!legacy_bindings)
 316                 {
 317                         if(changed&MODERN_MATRIX)
 318                         {
 319                                 standard_shdata.uniform("eye_obj_matrix", state->modelview_matrix);
 320                                 LinAl::SquareMatrix<float, 3> nm = state->modelview_matrix.block<3, 3>(0, 0);
 321                                 nm = transpose(invert(nm));
 322                                 standard_shdata.uniform_matrix3("eye_obj_normal_matrix", &nm(0, 0));
 323                                 changed = (changed&~MODERN_MATRIX)|STANDARD_SHDATA;
 324                         }
 325
 326                         if(state->material && (changed&MATERIAL_SHDATA))
 327                         {
 328                                 state->material->get_shader_data().apply();
 329                                 changed &= ~MATERIAL_SHDATA;
 330                         }
 331
 332                         if(changed&STANDARD_SHDATA)
 333                         {
 334                                 standard_shdata.apply();
 335                                 changed &= ~STANDARD_SHDATA;
 336                         }
 337                 }
 338
 339                 if((changed&SHADER_DATA) || shprog_changed)
 340                 {
 341                         vector<const ProgramData *>::const_iterator i = shdata_stack.begin();
 342                         if(!shprog_changed)
 343                                 i += shdata_applied;
 344                         for(; i!=shdata_stack.end(); ++i)
 345                                 (*i)->apply();
 346                         changed &= ~SHADER_DATA;
 347                         shdata_applied = shdata_stack.size();
 348                 }
 349         }
 350         else
 351                 Program::unbind();
 352
 353         if(state->mesh)
 354         {
 355                 if(legacy_bindings)
 356                 {
 357                         Mesh::unbind();
 358                         state->mesh->get_vertices().apply();
 359                 }
 360                 else
 361                         state->mesh->bind();
 362         }
 363         else
 364                 Mesh::unbind();
 365
 366         if(state->winding_test)
 367         {
 368                 if(state->reverse_winding)
 369                         state->winding_test->get_reverse().bind();
 370                 else
 371                         state->winding_test->bind();
 372         }
 373         else
 374                 WindingTest::unbind();
 375
 376         if(legacy_bindings)
 377         {
 378                 if(!matrices_loaded)
 379                 {
 380                         MatrixStack::modelview().push();
 381                         MatrixStack::projection().push();
 382                         matrices_loaded = true;
 383                 }
 384
 385                 if(changed&LEGACY_PROJECTION)
 386                 {
 387                         MatrixStack::projection() = state->camera->get_projection_matrix();
 388                         changed &= ~LEGACY_PROJECTION;
 389                 }
 390
 391                 if(changed&LEGACY_MATRIX)
 392                 {
 393                         MatrixStack::modelview() = state->modelview_matrix;
 394                         changed &= ~LEGACY_MATRIX;
 395                 }
 396         }
 397 }
 398
 399 void Renderer::reset_state()
 400 {
 401         if(!matrices_loaded)
 402                 return;
 403
 404         if(camera)
 405                 MatrixStack::projection().pop();
 406         MatrixStack::modelview().pop();
 407         matrices_loaded = false;
 408         changed |= MATRIX;
 409
 410         *state = State();
 411 }
 412
 413
 414 Renderer::State::State():
 415         camera(0),
 416         texture(0),
 417         texturing(0),
 418         lowest_effect_texunit(TexUnit::get_n_units()),
 419         material(0),
 420         lighting(0),
 421         clipping(0),
 422         shprog(0),
 423         shdata_count(0),
 424         mesh(0),
 425         winding_test(0),
 426         reverse_winding(false)
 427 { }
 428
 429 } // namespace GL
 430 } // namespace Msp