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