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