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 "vertexsetup.h"
  18 #include "windingtest.h"
  19
  20 using namespace std;
  21
  22 namespace Msp {
  23 namespace GL {
  24
  25 Renderer::Renderer(const Camera *c):
  26         default_camera(c),
  27         changed(0),
  28         matrices_loaded(false),
  29         state_stack(1)
  30 {
  31         state_stack.reserve(16);
  32         shdata_stack.reserve(32);
  33         state = &state_stack.back();
  34
  35         if(c)
  36                 set_camera(*c);
  37         else
  38         {
  39                 standard_shdata.uniform("projection_matrix", Matrix());
  40                 standard_shdata.uniform("eye_world_matrix", Matrix());
  41         }
  42 }
  43
  44 Renderer::~Renderer()
  45 {
  46         end();
  47 }
  48
  49 void Renderer::begin(const Camera *c)
  50 {
  51         end();
  52         if(c)
  53                 set_camera(*c);
  54 }
  55
  56 void Renderer::set_camera(const Camera &c)
  57 {
  58         state->camera = &c;
  59         standard_shdata.uniform("projection_matrix", state->camera->get_projection_matrix());
  60         standard_shdata.uniform("eye_world_matrix", state->camera->get_view_matrix());
  61         changed |= STANDARD_SHDATA|LEGACY_PROJECTION;
  62         set_matrix(state->camera->get_view_matrix());
  63 }
  64
  65 void Renderer::set_matrix(const Matrix &matrix)
  66 {
  67         state->modelview_matrix = matrix;
  68         changed |= MATRIX;
  69 }
  70
  71 void Renderer::transform(const Matrix &matrix)
  72 {
  73         state->modelview_matrix *= matrix;
  74         changed |= MATRIX;
  75 }
  76
  77 void Renderer::set_texture(const Texture *t)
  78 {
  79         state->texture = t;
  80         state->texturing = 0;
  81 }
  82
  83 void Renderer::set_texturing(const Texturing *t)
  84 {
  85         state->texturing = t;
  86         state->texture = 0;
  87 }
  88
  89 unsigned Renderer::allocate_effect_texunit()
  90 {
  91         return --state->lowest_effect_texunit;
  92 }
  93
  94 void Renderer::set_material(const Material *m)
  95 {
  96         state->material = m;
  97         changed |= MATERIAL_SHDATA;
  98 }
  99
 100 void Renderer::set_lighting(const Lighting *l)
 101 {
 102         state->lighting = l;
 103         state->lighting_matrix = state->modelview_matrix;
 104         if(l)
 105         {
 106                 l->update_shader_data(standard_shdata, state->lighting_matrix);
 107                 changed |= STANDARD_SHDATA;
 108         }
 109         changed |= LEGACY_LIGHTING;
 110 }
 111
 112 void Renderer::set_clipping(const Clipping *c)
 113 {
 114         state->clipping = c;
 115         state->clipping_matrix = state->modelview_matrix;
 116         if(c)
 117         {
 118                 c->update_shader_data(standard_shdata, state->clipping_matrix);
 119                 changed |= STANDARD_SHDATA;
 120         }
 121         changed |= LEGACY_CLIPPING;
 122 }
 123
 124 void Renderer::set_shader_program(const Program *p, const ProgramData *d)
 125 {
 126         state->shprog = p;
 127         if(p && d)
 128                 add_shader_data(*d);
 129 }
 130
 131 void Renderer::add_shader_data(const ProgramData &d)
 132 {
 133         if(state->shdata_count<shdata_stack.size() && shdata_stack[state->shdata_count]==&d)
 134                 ++state->shdata_count;
 135         else
 136         {
 137                 if(shdata_stack.size()>state->shdata_count)
 138                         shdata_stack.erase(shdata_stack.begin()+state->shdata_count, shdata_stack.end());
 139                 shdata_stack.push_back(&d);
 140                 state->shdata_count = shdata_stack.size();
 141                 changed |= SHADER_DATA;
 142         }
 143 }
 144
 145 void Renderer::set_mesh(const Mesh *m)
 146 {
 147         state->mesh = m;
 148 }
 149
 150 void Renderer::set_vertex_setup(const VertexSetup *vs)
 151 {
 152         state->vertex_setup = vs;
 153 }
 154
 155 void Renderer::set_winding_test(const WindingTest *w)
 156 {
 157         state->winding_test = w;
 158 }
 159
 160 void Renderer::set_reverse_winding(bool r)
 161 {
 162         state->reverse_winding = r;
 163 }
 164
 165 void Renderer::set_object_lod_bias(unsigned b)
 166 {
 167         state->object_lod_bias = b;
 168 }
 169
 170 void Renderer::push_state()
 171 {
 172         state_stack.push_back(state_stack.back());
 173         state = &state_stack.back();
 174 }
 175
 176 void Renderer::pop_state()
 177 {
 178         if(state_stack.size()==1)
 179                 throw stack_underflow("Renderer::pop_state");
 180
 181         const Camera *old_camera = state->camera;
 182         const Lighting *old_lighting = state->lighting;
 183         const Clipping *old_clipping = state->clipping;
 184         state_stack.pop_back();
 185         state = &state_stack.back();
 186         changed |= MATRIX;
 187         bool camera_changed = (state->camera!=old_camera);
 188         if(camera_changed)
 189         {
 190                 if(state->camera)
 191                 {
 192                         standard_shdata.uniform("projection_matrix", state->camera->get_projection_matrix());
 193                         standard_shdata.uniform("eye_world_matrix", state->camera->get_view_matrix());
 194                 }
 195                 else
 196                 {
 197                         standard_shdata.uniform("projection_matrix", Matrix());
 198                         standard_shdata.uniform("eye_world_matrix", Matrix());
 199                 }
 200                 changed |= STANDARD_SHDATA|LEGACY_PROJECTION;
 201         }
 202         /* This actually should compare the relevant matrices rather than check for
 203         camera, but in practice lighting and clipping is set right after the camera
 204         and a boolean check is much faster than matrix comparison. */
 205         if(state->lighting!=old_lighting || camera_changed)
 206         {
 207                 if(state->lighting)
 208                 {
 209                         state->lighting->update_shader_data(standard_shdata, state->lighting_matrix);
 210                         changed |= STANDARD_SHDATA;
 211                 }
 212                 changed |= LEGACY_LIGHTING;
 213         }
 214         if(state->clipping!=old_clipping || camera_changed)
 215         {
 216                 if(state->clipping)
 217                 {
 218                         state->clipping->update_shader_data(standard_shdata, state->clipping_matrix);
 219                         changed |= STANDARD_SHDATA;
 220                 }
 221                 changed |= LEGACY_CLIPPING;
 222         }
 223 }
 224
 225 void Renderer::end()
 226 {
 227         if(state_stack.size()>1)
 228                 throw invalid_operation("Renderer::end");
 229
 230         *state = State();
 231         if(default_camera)
 232                 set_camera(*default_camera);
 233         else
 234                 standard_shdata.uniform("projection_matrix", Matrix());
 235         shdata_stack.clear();
 236         excluded.clear();
 237
 238         Mesh::unbind();
 239         Texturing::unbind();
 240         Texture::unbind_from(0);
 241         Material::unbind();
 242         Lighting::unbind();
 243         Clipping::unbind();
 244         Program::unbind();
 245         VertexSetup::unbind();
 246         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 247         WindingTest::unbind();
 248
 249         if(matrices_loaded)
 250         {
 251                 MatrixStack::projection().pop();
 252                 MatrixStack::modelview().pop();
 253                 matrices_loaded = false;
 254         }
 255 }
 256
 257 void Renderer::exclude(const Renderable &renderable)
 258 {
 259         excluded.insert(&renderable);
 260 }
 261
 262 void Renderer::include(const Renderable &renderable)
 263 {
 264         excluded.erase(&renderable);
 265 }
 266
 267 void Renderer::render(const Renderable &renderable, const Tag &tag)
 268 {
 269         if(!excluded.count(&renderable))
 270                 renderable.render(*this, tag);
 271 }
 272
 273 void Renderer::draw(const Batch &batch)
 274 {
 275         apply_state();
 276
 277         batch.draw();
 278 }
 279
 280 void Renderer::draw_instanced(const Batch &batch, unsigned count)
 281 {
 282         apply_state();
 283
 284         batch.draw_instanced(count);
 285 }
 286
 287 void Renderer::apply_state()
 288 {
 289         /* We (mostly) let the objects themselves figure out if the binding has
 290         changed */
 291
 292         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 293         bool legacy_textures = !state->shprog;
 294
 295         if(state->texturing)
 296                 state->texturing->bind(legacy_textures);
 297         else
 298         {
 299                 Texturing::unbind();
 300                 if(state->texture)
 301                         state->texture->bind_to(0, legacy_textures);
 302                 else
 303                         Texture::unbind_from(0);
 304         }
 305
 306         if(legacy_bindings)
 307         {
 308                 if(state->material)
 309                         state->material->bind();
 310                 else
 311                         Material::unbind();
 312
 313                 if(changed&LEGACY_LIGHTING)
 314                 {
 315                         if(state->lighting)
 316                         {
 317                                 MatrixStack::modelview() = state->lighting_matrix;
 318                                 state->lighting->bind();
 319                                 changed = (changed&~LEGACY_LIGHTING)|LEGACY_MATRIX;
 320                         }
 321                         else
 322                                 Lighting::unbind();
 323                 }
 324         }
 325
 326         if(state->clipping)
 327         {
 328                 if(legacy_bindings)
 329                 {
 330                         if(changed&LEGACY_CLIPPING)
 331                         {
 332                                 MatrixStack::modelview() = state->clipping_matrix;
 333                                 state->clipping->bind(true);
 334                                 changed = (changed&~LEGACY_CLIPPING)|LEGACY_MATRIX;
 335                         }
 336                 }
 337                 else
 338                         state->clipping->bind(false);
 339         }
 340         else
 341                 Clipping::unbind();
 342
 343         if(state->shprog)
 344         {
 345                 bool shprog_changed = (state->shprog!=Program::current());
 346                 state->shprog->bind();
 347
 348                 if(!legacy_bindings)
 349                 {
 350                         if(changed&MODERN_MATRIX)
 351                         {
 352                                 standard_shdata.uniform("eye_obj_matrix", state->modelview_matrix);
 353                                 LinAl::SquareMatrix<float, 3> nm = state->modelview_matrix.block<3, 3>(0, 0);
 354                                 nm = transpose(invert(nm));
 355                                 standard_shdata.uniform_matrix3("eye_obj_normal_matrix", &nm(0, 0));
 356                                 changed = (changed&~MODERN_MATRIX)|STANDARD_SHDATA;
 357                         }
 358
 359                         if(state->material && ((changed&MATERIAL_SHDATA) || shprog_changed))
 360                         {
 361                                 state->material->get_shader_data().apply();
 362                                 changed &= ~MATERIAL_SHDATA;
 363                         }
 364
 365                         if((changed&STANDARD_SHDATA) || shprog_changed)
 366                         {
 367                                 standard_shdata.apply();
 368                                 changed &= ~STANDARD_SHDATA;
 369                         }
 370                 }
 371
 372                 bool extra_shdata = (shdata_stack.size()>state->shdata_count);
 373
 374                 if((changed&SHADER_DATA) || shprog_changed || extra_shdata)
 375                 {
 376                         if(extra_shdata)
 377                                 shdata_stack.erase(shdata_stack.begin()+state->shdata_count, shdata_stack.end());
 378                         for(vector<const ProgramData *>::const_iterator i=shdata_stack.begin(); i!=shdata_stack.end(); ++i)
 379                                 (*i)->apply();
 380                         changed &= ~SHADER_DATA;
 381                 }
 382         }
 383         else
 384                 Program::unbind();
 385
 386         if(state->mesh)
 387         {
 388                 if(legacy_bindings)
 389                 {
 390                         Mesh::unbind();
 391                         state->mesh->get_vertices().apply();
 392                         if(const Buffer *ibuf = state->mesh->get_index_buffer())
 393                                 ibuf->bind_to(ELEMENT_ARRAY_BUFFER);
 394                         else
 395                                 Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 396                 }
 397                 else
 398                         state->mesh->bind();
 399         }
 400         else
 401         {
 402                 Mesh::unbind();
 403
 404                 if(state->vertex_setup)
 405                         state->vertex_setup->bind();
 406                 else
 407                         VertexSetup::unbind();
 408         }
 409
 410         if(state->winding_test)
 411         {
 412                 if(state->reverse_winding)
 413                         state->winding_test->get_reverse().bind();
 414                 else
 415                         state->winding_test->bind();
 416         }
 417         else
 418                 WindingTest::unbind();
 419
 420         if(legacy_bindings)
 421         {
 422                 if(!matrices_loaded)
 423                 {
 424                         MatrixStack::modelview().push();
 425                         MatrixStack::projection().push();
 426                         matrices_loaded = true;
 427                 }
 428
 429                 if(changed&LEGACY_PROJECTION)
 430                 {
 431                         MatrixStack::projection() = state->camera->get_projection_matrix();
 432                         changed &= ~LEGACY_PROJECTION;
 433                 }
 434
 435                 if(changed&LEGACY_MATRIX)
 436                 {
 437                         MatrixStack::modelview() = state->modelview_matrix;
 438                         changed &= ~LEGACY_MATRIX;
 439                 }
 440         }
 441 }
 442
 443
 444 Renderer::State::State():
 445         camera(0),
 446         texture(0),
 447         texturing(0),
 448         lowest_effect_texunit(TexUnit::get_n_units()),
 449         material(0),
 450         lighting(0),
 451         clipping(0),
 452         shprog(0),
 453         shdata_count(0),
 454         mesh(0),
 455         vertex_setup(0),
 456         winding_test(0),
 457         reverse_winding(false),
 458         object_lod_bias(0)
 459 { }
 460
 461 } // namespace GL
 462 } // namespace Msp