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