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::push_state()
 166 {
 167         state_stack.push_back(state_stack.back());
 168         state = &state_stack.back();
 169 }
 170
 171 void Renderer::pop_state()
 172 {
 173         if(state_stack.size()==1)
 174                 throw stack_underflow("Renderer::pop_state");
 175
 176         const Camera *old_camera = state->camera;
 177         const Lighting *old_lighting = state->lighting;
 178         const Clipping *old_clipping = state->clipping;
 179         state_stack.pop_back();
 180         state = &state_stack.back();
 181         changed |= MATRIX;
 182         bool camera_changed = (state->camera!=old_camera);
 183         if(camera_changed)
 184         {
 185                 if(state->camera)
 186                 {
 187                         standard_shdata.uniform("projection_matrix", state->camera->get_projection_matrix());
 188                         standard_shdata.uniform("eye_world_matrix", state->camera->get_view_matrix());
 189                 }
 190                 else
 191                 {
 192                         standard_shdata.uniform("projection_matrix", Matrix());
 193                         standard_shdata.uniform("eye_world_matrix", Matrix());
 194                 }
 195                 changed |= STANDARD_SHDATA|LEGACY_PROJECTION;
 196         }
 197         /* This actually should compare the relevant matrices rather than check for
 198         camera, but in practice lighting and clipping is set right after the camera
 199         and a boolean check is much faster than matrix comparison. */
 200         if(state->lighting!=old_lighting || camera_changed)
 201         {
 202                 if(state->lighting)
 203                 {
 204                         state->lighting->update_shader_data(standard_shdata, state->lighting_matrix);
 205                         changed |= STANDARD_SHDATA;
 206                 }
 207                 changed |= LEGACY_LIGHTING;
 208         }
 209         if(state->clipping!=old_clipping || camera_changed)
 210         {
 211                 if(state->clipping)
 212                 {
 213                         state->clipping->update_shader_data(standard_shdata, state->clipping_matrix);
 214                         changed |= STANDARD_SHDATA;
 215                 }
 216                 changed |= LEGACY_CLIPPING;
 217         }
 218 }
 219
 220 void Renderer::end()
 221 {
 222         if(state_stack.size()>1)
 223                 throw invalid_operation("Renderer::end");
 224
 225         *state = State();
 226         if(default_camera)
 227                 set_camera(*default_camera);
 228         else
 229                 standard_shdata.uniform("projection_matrix", Matrix());
 230         shdata_stack.clear();
 231         excluded.clear();
 232
 233         Mesh::unbind();
 234         Texturing::unbind();
 235         Texture::unbind_from(0);
 236         Material::unbind();
 237         Lighting::unbind();
 238         Clipping::unbind();
 239         Program::unbind();
 240         VertexSetup::unbind();
 241         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 242         WindingTest::unbind();
 243
 244         if(matrices_loaded)
 245         {
 246                 MatrixStack::projection().pop();
 247                 MatrixStack::modelview().pop();
 248                 matrices_loaded = false;
 249         }
 250 }
 251
 252 void Renderer::exclude(const Renderable &renderable)
 253 {
 254         excluded.insert(&renderable);
 255 }
 256
 257 void Renderer::include(const Renderable &renderable)
 258 {
 259         excluded.erase(&renderable);
 260 }
 261
 262 void Renderer::render(const Renderable &renderable, const Tag &tag)
 263 {
 264         if(!excluded.count(&renderable))
 265                 renderable.render(*this, tag);
 266 }
 267
 268 void Renderer::draw(const Batch &batch)
 269 {
 270         apply_state();
 271
 272         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 273         if(state->mesh && legacy_bindings)
 274         {
 275                 if(const Buffer *ibuf = state->mesh->get_index_buffer())
 276                         ibuf->bind_to(ELEMENT_ARRAY_BUFFER);
 277                 else
 278                         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 279         }
 280
 281         batch.draw();
 282 }
 283
 284 void Renderer::apply_state()
 285 {
 286         /* We (mostly) let the objects themselves figure out if the binding has
 287         changed */
 288
 289         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 290         bool legacy_textures = !state->shprog;
 291
 292         if(state->texturing)
 293                 state->texturing->bind(legacy_textures);
 294         else
 295         {
 296                 Texturing::unbind();
 297                 if(state->texture)
 298                         state->texture->bind_to(0, legacy_textures);
 299                 else
 300                         Texture::unbind_from(0);
 301         }
 302
 303         if(legacy_bindings)
 304         {
 305                 if(state->material)
 306                         state->material->bind();
 307                 else
 308                         Material::unbind();
 309
 310                 if(changed&LEGACY_LIGHTING)
 311                 {
 312                         if(state->lighting)
 313                         {
 314                                 MatrixStack::modelview() = state->lighting_matrix;
 315                                 state->lighting->bind();
 316                                 changed = (changed&~LEGACY_LIGHTING)|LEGACY_MATRIX;
 317                         }
 318                         else
 319                                 Lighting::unbind();
 320                 }
 321         }
 322
 323         if(state->clipping)
 324         {
 325                 if(legacy_bindings)
 326                 {
 327                         if(changed&LEGACY_CLIPPING)
 328                         {
 329                                 MatrixStack::modelview() = state->clipping_matrix;
 330                                 state->clipping->bind(true);
 331                                 changed = (changed&~LEGACY_CLIPPING)|LEGACY_MATRIX;
 332                         }
 333                 }
 334                 else
 335                         state->clipping->bind(false);
 336         }
 337         else
 338                 Clipping::unbind();
 339
 340         if(state->shprog)
 341         {
 342                 bool shprog_changed = (state->shprog!=Program::current());
 343                 state->shprog->bind();
 344
 345                 if(!legacy_bindings)
 346                 {
 347                         if(changed&MODERN_MATRIX)
 348                         {
 349                                 standard_shdata.uniform("eye_obj_matrix", state->modelview_matrix);
 350                                 LinAl::SquareMatrix<float, 3> nm = state->modelview_matrix.block<3, 3>(0, 0);
 351                                 nm = transpose(invert(nm));
 352                                 standard_shdata.uniform_matrix3("eye_obj_normal_matrix", &nm(0, 0));
 353                                 changed = (changed&~MODERN_MATRIX)|STANDARD_SHDATA;
 354                         }
 355
 356                         if(state->material && ((changed&MATERIAL_SHDATA) || shprog_changed))
 357                         {
 358                                 state->material->get_shader_data().apply();
 359                                 changed &= ~MATERIAL_SHDATA;
 360                         }
 361
 362                         if((changed&STANDARD_SHDATA) || shprog_changed)
 363                         {
 364                                 standard_shdata.apply();
 365                                 changed &= ~STANDARD_SHDATA;
 366                         }
 367                 }
 368
 369                 bool extra_shdata = (shdata_stack.size()>state->shdata_count);
 370
 371                 if((changed&SHADER_DATA) || shprog_changed || extra_shdata)
 372                 {
 373                         if(extra_shdata)
 374                                 shdata_stack.erase(shdata_stack.begin()+state->shdata_count, shdata_stack.end());
 375                         for(vector<const ProgramData *>::const_iterator i=shdata_stack.begin(); i!=shdata_stack.end(); ++i)
 376                                 (*i)->apply();
 377                         changed &= ~SHADER_DATA;
 378                 }
 379         }
 380         else
 381                 Program::unbind();
 382
 383         if(state->mesh)
 384         {
 385                 if(legacy_bindings)
 386                 {
 387                         Mesh::unbind();
 388                         state->mesh->get_vertices().apply();
 389                 }
 390                 else
 391                         state->mesh->bind();
 392         }
 393         else
 394         {
 395                 Mesh::unbind();
 396
 397                 if(state->vertex_setup)
 398                         state->vertex_setup->bind();
 399                 else
 400                         VertexSetup::unbind();
 401         }
 402
 403         if(state->winding_test)
 404         {
 405                 if(state->reverse_winding)
 406                         state->winding_test->get_reverse().bind();
 407                 else
 408                         state->winding_test->bind();
 409         }
 410         else
 411                 WindingTest::unbind();
 412
 413         if(legacy_bindings)
 414         {
 415                 if(!matrices_loaded)
 416                 {
 417                         MatrixStack::modelview().push();
 418                         MatrixStack::projection().push();
 419                         matrices_loaded = true;
 420                 }
 421
 422                 if(changed&LEGACY_PROJECTION)
 423                 {
 424                         MatrixStack::projection() = state->camera->get_projection_matrix();
 425                         changed &= ~LEGACY_PROJECTION;
 426                 }
 427
 428                 if(changed&LEGACY_MATRIX)
 429                 {
 430                         MatrixStack::modelview() = state->modelview_matrix;
 431                         changed &= ~LEGACY_MATRIX;
 432                 }
 433         }
 434 }
 435
 436
 437 Renderer::State::State():
 438         camera(0),
 439         texture(0),
 440         texturing(0),
 441         lowest_effect_texunit(TexUnit::get_n_units()),
 442         material(0),
 443         lighting(0),
 444         clipping(0),
 445         shprog(0),
 446         shdata_count(0),
 447         mesh(0),
 448         vertex_setup(0),
 449         winding_test(0),
 450         reverse_winding(false)
 451 { }
 452
 453 } // namespace GL
 454 } // namespace Msp